WO2011145271A1 - Band-pass filter, and wireless access device - Google Patents
Band-pass filter, and wireless access device Download PDFInfo
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- WO2011145271A1 WO2011145271A1 PCT/JP2011/002277 JP2011002277W WO2011145271A1 WO 2011145271 A1 WO2011145271 A1 WO 2011145271A1 JP 2011002277 W JP2011002277 W JP 2011002277W WO 2011145271 A1 WO2011145271 A1 WO 2011145271A1
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- band
- frequency
- waveguide
- bandpass filter
- pass filter
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/2016—Slot line filters; Fin line filters
Definitions
- the present invention relates to a bandpass filter and a wireless access device.
- the frequency band used for each customer is different, and even in the same frequency band, the high frequency input / output unit has a high frequency band for removing unnecessary waves.
- a pass filter (BPF: Band-Pass Filter) is used, but a band-pass filter has a wide band (for example, a frequency band of 1 GHz or more in the 23 GHz band), high attenuation, and low loss. Therefore, it is impossible to cover with one type of band-pass filter, and it will be divided into multiple band-pass filters according to the frequency band. Has become enormous.
- a waveguide changeover switch is used to switch a plurality of, for example, two types of bandpass filters (BPF).
- BPF bandpass filters
- Japanese Patent Application Laid-Open No. 63-028102 discloses a “waveguide switch”.
- Patent Document 2 Japanese Patent Application Laid-Open No. 63-248201, “Waveguide Switch”, Japanese Patent Application Laid-Open No. 59-047802, “Waveguide Switch”, Japanese Patent Application Laid-Open No. 2009-212855, “Waveguide”. All of the waveguide changeover switches proposed in “Tube Switch” and the like are very large and difficult to incorporate in outdoor equipment.
- JP-A-63-028102 (2nd page) JP 63-248201 A (page 2) JP 59-047802 A (page 3-4) JP 2009-212855 A (page 4-5)
- the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a bandpass filter and a radio access device that can switch a plurality of types of bandpass filters with a simple switching mechanism. It is said.
- the band-pass filter and the wireless access device mainly adopt the following characteristic configuration.
- a band-pass filter according to the present invention is a band-pass filter including a waveguide that passes only a signal in a frequency band selected from millimeter-wave band signals, and is divided into two equal parts at the center of the H plane.
- a thin metal plate in which a plurality of rectangular holes having a size and interval determined in accordance with a frequency band to be passed are formed in a row by the divided waveguide is parallel to the E plane of the waveguide. It is characterized by having a structure sandwiched between.
- a radio access apparatus according to the present invention is a radio access apparatus that transmits and receives millimeter-wave band radio signals. At least the bandpass filter according to (1) is replaced with a bandpass filter for transmission and a bandpass for reception. It is implemented as a filter.
- a plurality of types of bandpass filters can be used as a bandpass filter indispensable for removing unnecessary frequencies in the millimeter waveband radio access apparatus by an extremely simple switching mechanism.
- BPFs bandpass filters
- the present invention makes it possible to switch a plurality of types of bandpass filters (BPF) to bandpass filters having desired frequency characteristics by a very simple switching mechanism. Furthermore, it is possible to simultaneously realize a plurality of band pass filters (BPF) with one thin metal plate (fin).
- BPF bandpass filters
- the present invention divides the waveguide into two equal parts at the center of the H plane (H-plane: magnetic field plane), and depending on the frequency band to be passed by the two divided waveguides.
- a band-pass filter (BPF) having a structure in which thin metal plates (fins) each having a plurality of rectangular holes having a predetermined size and interval are formed in a row and sandwiched in parallel with an E plane (E-plane: electric field plane). It is characterized by forming.
- a bandpass filter (BPF) a plurality of rectangular holes having different sizes and intervals for each row are formed in one metal plate as a plurality of waveguides.
- a plurality of band-pass filters (BPF) having different frequencies are formed, both ends of each waveguide are joined by T-branch, and any one of the plurality of band-pass filters (BPF) is joined to the joined portion.
- Switching mechanism for switching to a band pass filter (BPF) for example, a screw for forming a reflection rod is screwed into screw holes formed at both ends of each waveguide, and a signal in an unnecessary frequency band is obtained.
- a variable band-pass filter BPF
- the present invention is characterized in that the frequency variable bandpass filter as described above is mounted as a bandpass filter for transmission / reception in a radio access device that transmits / receives a millimeter-wave band signal.
- band pass filter having different center frequencies of N types (N: an integer of 2 or more) according to the frequency band to be used as a frequency variable band pass filter (BPF)
- N an integer of 2 or more
- FIG. 1 is a block configuration diagram showing an example of a block configuration of a radio access apparatus according to the present invention.
- a wireless access device that handles millimeter-wave band signals is generally composed of an outdoor device and an indoor device. Between the outdoor device and the indoor device, an IF (Intermediate Frequency: intermediate frequency) band signal and an outdoor device are used. Are connected by a coaxial cable in which a control signal for controlling the power and a power source are superimposed. As shown in FIG. 1, the outdoor device has an IF signal, a control signal, and a power source that are transmitted and received with the indoor device, and a multiplexer (Multiplexer) 11 that separates and combines the power, and a transmission IF signal.
- IF Intermediate Frequency: intermediate frequency
- a transmission circuit unit 12 that converts and amplifies an RF (Radio Frequency) signal
- a reception circuit unit 13 that amplifies the received RF signal and converts it to a reception IF signal
- a transmission bandpass filter 14 that removes unnecessary waves, and reception It is composed of a band pass filter 15.
- the transmission bandpass filter 14 is configured as a so-called variable frequency bandpass filter, and includes two transmission bandpass filters 14a (center frequency f1) and transmission bandpass having different center frequencies. It comprises a filter 14b (center frequency f2) and two change-over switches 14c and 14d provided at both input and output ends in order to switch the two transmission bandpass filters 14a and 14b according to the used frequency band.
- the pass filter 15 is also configured as a so-called frequency variable bandpass filter, and includes two reception bandpass filters 15a (center frequency f1 ') and reception bandpass filter 15b (center frequency f2') having different center frequencies. Frequency of receiving band-pass filters 15a and 15b Two changeover switches 15c provided in the input and output ends in order to switch in accordance with the frequency band, and a 15d.
- FIG. 5 shows a block configuration of the conventional wireless access device.
- FIG. 5 is a block diagram illustrating an example of a block configuration of a conventional wireless access device.
- a transmission bandpass filter and a reception bandpass filter are Each has one configuration. That is, as shown in FIG. 5, the outdoor device of the conventional wireless access device is configured by a multiplexer 21, a transmission circuit unit 22, a reception circuit unit 23, a transmission bandpass filter 24 and a reception bandpass filter 25.
- FIGS. 2A and 2B are structural diagrams showing an example of the structure of a bandpass filter (BPF) mounted on an outdoor device of a wireless access device according to the present invention, and FIG. 2A shows switching for two types of bandpass filters.
- FIG. 2B is an exploded perspective view showing a state in which a bandpass filter (BPF) having a mechanism is disassembled and viewed obliquely from above, and FIG. 2B is a bandpass filter (BPF) having a switching mechanism for two types of bandpass filters.
- a bandpass filter (frequency variable bandpass filter) having a switching mechanism for two types of bandpass filters has a thin metal plate 1 at the center of the H plane (H-plane: magnetic field plane). It is configured by being sandwiched in parallel with the E plane (E-plane: electric field plane) by the waveguide 2 divided into equal parts.
- the metal plate 1 has two rows of rectangular holes 4a and 4b having intervals and sizes determined according to the frequency characteristics of the band-pass filter (that is, the frequency band to be passed). A plurality of holes are perforated.
- the metal plate 1 in order to form two types of band-pass filters (center frequencies f1, f2) having different frequency characteristics as a frequency variable band-pass filter on a single metal plate 1, the metal plate 1
- the rectangular holes 4a and 4b having different intervals and sizes are formed in two rows, and the portion of the metal plate 1 in which the rectangular holes 4a and 4b are formed is divided into two equal parts.
- two types of band-pass filters are formed.
- the two types of formed bandpass filters are joined by a T-branch that excites with opposite phase equal amplitude,
- the joint portion is provided with a switching mechanism for switching which of the two types of band pass filters is operated as the frequency variable band pass filter.
- a switching mechanism for switching between two types of bandpass filters (transmission-side changeover switches 14c and 14d or reception-side changeover switches 15c and 15d shown in FIG. 1) Screw holes A and A for screwing screws and screw holes so that the reflecting rods 3 can be disposed at both ends of each of the two rows of waveguides 2 forming a kind of band-pass filter. B and B are drilled.
- the reflection rod 3 for constituting the switching mechanism is realized by a screw, and the waveguide 2 which is to suppress the operation among the two rows of waveguides 2 (two types of bandpass filters).
- One of the waveguides 2 (bandpass filter) is operated by screwing a screw forming the reflecting rod 3 into the screw hole A, A or screw hole B, B on the (bandpass filter) side. An example is shown.
- the transmission bandpass filter 14 that operates as a frequency variable bandpass filter in the wireless access device of FIG. 1, the transmission bandpass filter having the frequency characteristic of the transmission center frequency f1 out of the two types of transmission bandpass filters 14a and 14b.
- the switch 14a is operated, as the changeover switches 14c and 14d, the screws of the reflecting bar 3 are screwed into the screw holes B and B at both ends of the waveguide 2, and the reflecting bar 3 operates as a band pass filter 14b.
- the screws of the reflector 3 are used as the changeover switches 14c and 14d.
- the screws forming the reflecting rod 3 are screw holes A and A or screw holes B and B formed in both ends of the two rows of waveguides 2. It is used as a frequency variable bandpass filter that can easily switch between two types of bandpass filters (a bandpass filter having a center frequency f1 and a bandpass filter having a center frequency f2) simply by performing an operation of screwing into the band. be able to.
- FIG. 3 is a characteristic diagram showing a simulation result of the frequency characteristics of the bandpass filter shown in FIGS. 2A and 2B.
- the screw of the reflector 3 is screwed into the screw holes B and B at both ends of the waveguide 2.
- the pass characteristic and the return loss characteristic when operated as a bandpass filter having the frequency characteristic of the center frequency f1 and the screw of the reflector 3 are screwed into the screw holes A and A at both ends of the waveguide 2 to be centered.
- the pass characteristic and the return loss characteristic when operated as a bandpass filter having the frequency characteristic of the frequency f2 are respectively illustrated. Note that FIG. 3 shows a simulation result in the case where the center frequency f1 is 21.5 GHz and the center frequency f2 is 22.1 GHz.
- the radio access device When using the millimeter wave band of 23 GHz as a radio frequency band, the radio access device generally needs to have a frequency band of about 1,200 MHz as a cover band. It is impossible to cover such a wide frequency band with one type of band-pass filter. As shown in the f1 pass characteristic curve or the f2 pass characteristic curve in FIG. One type of bandpass filter alone is limited in covering a frequency band of about 700 MHz.
- the conventional radio access device as described above, at least two types of radio access devices, that is, a radio access device including a bandpass filter having a frequency characteristic such as an f1 pass characteristic curve, and an f2 pass characteristic It has been necessary to separately prepare a radio access apparatus including a bandpass filter having a frequency characteristic like a curve. Therefore, in the conventional radio access device, it is necessary to arrange radio access devices that cover the respective frequency bands as radio sections facing each other. Therefore, a total of four types of radio access devices in which transmission and reception frequencies are switched are provided. It was necessary to prepare, and the number of devices was increased.
- a bandpass filter having a switching mechanism for two types of bandpass filters as described above is provided as a frequency variable bandpass filter on the transmitting side and the receiving side of the wireless access device, and screws 2 forming the reflector 3 are provided. It is extremely simple just to screw into one of the two screw holes A and A and screw holes B and B formed at both ends of the waveguides 2 in the row. By a simple operation, it can be operated as a transmission / reception circuit having the frequency characteristic of the center frequency f1, or can be operated as a transmission / reception circuit having the frequency characteristic of the center frequency f2 (f2 ⁇ f1).
- the bandpass filter (frequency variable bandpass filter) having the structure shown in FIGS. 2A and 2B having the two types of bandpass filters can be obtained as shown in FIG.
- the frequency band of 1,300 MHz from 21.15 GHz to 22.45 GHz is obtained as the total frequency characteristic obtained by summing the characteristics of both band pass filters. It can be seen that it can be a cover band and can sufficiently cover a wide frequency band of 1,200 MHz required in the radio frequency band of 23 GHz band.
- the reflection rod 3 is formed by providing the band-pass filter (frequency variable band-pass filter) having the switching mechanism of the two types of band-pass filters as described above on the transmission side and the reception side of the wireless access device.
- the frequency characteristic of the center frequency f1 can be obtained by an extremely simple operation of simply screwing the screws to be screwed into the screw holes A and A or the screw holes B and B formed at both ends of the two rows of waveguides 2. It can be operated as a transmission / reception circuit having the same frequency, or can be operated as a transmission / reception circuit having a frequency characteristic of the center frequency f2 (f2 ⁇ f1).
- a wireless access device equipped with such a bandpass filter (frequency variable bandpass filter) is placed opposite to the wireless section by changing the transmission / reception frequency. Compared to the case of four, it is possible to halve the amount of one facing to two.
- FIG. 4 is a structural diagram showing another example of the structure of a band-pass filter (BPF) mounted on the outdoor device of the wireless access device according to the present invention.
- BPF band-pass filter
- One metal plate is constituted by three rows of waveguides.
- An example is shown in which three types of bandpass filters having different center frequencies are configured by being sandwiched.
- a bandpass filter (frequency variable bandpass filter) provided with a switching mechanism for three types of bandpass filters has a thin metal plate 5 formed on an H surface (H -Plane: magnetic field plane) is sandwiched in parallel with the E plane (E-plane: electric field plane) by the waveguide 6 divided into two equal parts.
- the metal plate 5 has a plurality of rectangular holes 7a, 7b, 7c each having an interval and a size determined according to the frequency characteristics of the bandpass filter (that is, the frequency band to be passed) in three rows. It has been drilled.
- the frequency characteristics of the frequency variable bandpass filter in order to form three types of bandpass filters (center frequencies f1, f2, and f3) having different frequency characteristics on one metal plate 5,
- the rectangular holes 7a, 7b and 7c having different intervals and sizes are formed in three rows, and the portion of the metal plate 5 in which the rectangular holes 7a, 7b and 7c are formed is divided into 2 etc.
- Three types of band-pass filters are formed by sandwiching them between the divided waveguides 6. Further, in order to connect the formed three types of band-pass filters to the input / output ends of signals to be input / output to / from an external circuit, the formed three types of band-pass filters are joined by a T-branch that excites with opposite phase equal amplitudes.
- the joint portion is provided with a switching mechanism for switching which of the three types of bandpass filters is operated as a frequency variable bandpass filter.
- the reflecting rods can be disposed at both ends of each of the three rows of waveguides 6 forming three types of bandpass filters. Screw holes A and A, screw holes B and B, and screw holes C and C for screwing the screws are formed.
- the screws of the reflector are screw holes B and B and screw holes C and C at both ends of the waveguide 6. And the input / output of a signal to the waveguide 6 that operates as a band-pass filter having the center frequencies f2 and f3 is suppressed by the reflector 3. Further, when operating as a band-pass filter having a frequency characteristic of the center frequency f2, the reflection rod screw is screwed into the screw holes C and C and the screw holes A and A at both ends of the waveguide 6 for reflection.
- the rod 3 suppresses input / output of signals to / from the waveguide 6 operating as a bandpass filter having center frequencies f3 and f1. Further, when operating as a bandpass filter having a frequency characteristic of the center frequency f3, the reflection rod screw is screwed into the screw holes A and A and the screw holes B and B at both ends of the waveguide 6 for reflection. The rod 3 suppresses input / output of signals to / from the waveguide 6 that operates as a bandpass filter having the center frequencies f1 and f2.
- a screw that forms a reflecting rod is provided.
- Two pairs of screw holes among the three pairs of screw holes A and A, screw holes B and B, and screw holes C and C formed at both ends of each of the three rows of waveguides 6 It is possible to operate as a transmission / reception circuit having the frequency characteristic of the center frequency f1 or to operate as a transmission / reception circuit having the frequency characteristic of the center frequency f2 (f2 ⁇ f1) by an extremely simple operation only by screwing to the center. It can also be operated as a transmission / reception circuit having a frequency characteristic of a center frequency f3 (f3 ⁇ f2 ⁇ f1).
- the band-pass filter according to the present invention is not only for switching between two or three types of band-pass filters, but more generally, a switching mechanism for switching N-type (N: integer greater than or equal to 2) band-pass filters. It can also be configured as a bandpass filter (frequency variable bandpass filter) provided with
- the present invention can be used for an outdoor device of a millimeter wave band wireless access device.
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Abstract
A band pass filter that handles milli-wave zone signals is formed as a plurality of types, for example two types, of band pass filter having mutually differing wavelength properties by means of sandwiching in a state parallel to the E plane of a waveguide (2) a thin metal plate (1) wherein a plurality of square holes (4a, 4b) having differing sizes and spacing corresponding to a wavelength band that is allowed to pass through by means of the waveguide (2), which is bisected by the center of an H plane, are bored in a plurality of rows, for example two rows. Furthermore, as a switching mechanism that switches which waveguide to cause to operate as a band pass filter, screw holes (A, A, B, B) that can thread to screws that form a reflective rod (3) for suppressing input/output of a signal to another waveguide are bored at both ends of each of the plurality of rows, for example two rows, of waveguides for connecting to the signal input/output terminals of an external circuit. As a result, it is possible to provide a variable-frequency band pass filter that can switch between a plurality of types of band pass filter.
Description
本発明は、バンドパスフィルタおよび無線アクセス装置に関する。
The present invention relates to a bandpass filter and a wireless access device.
ミリ波帯の無線アクセス装置の屋外装置においては、顧客ごとに使用する周波数帯が異なり、さらには、同じ周波数帯であっても、不要波除去のために、その高周波入出力部には高周波バンドパスフィルタ(BPF:Band-Pass Filter)が使用されるが、バンドパスフィルタには、広帯域(例えば23GHz帯では1GHz以上の周波数帯域に及ぶ)であること、高減衰量であること、低損失であることが要求されるため、1種類のバンドパスフィルタでカバーすることが不可能であり、周波数帯域に合わせて複数のバンドパスフィルタに分割して使い分けられることになり、屋外装置の種類や個数が膨大になってきている。
In the outdoor device of the millimeter wave band wireless access device, the frequency band used for each customer is different, and even in the same frequency band, the high frequency input / output unit has a high frequency band for removing unnecessary waves. A pass filter (BPF: Band-Pass Filter) is used, but a band-pass filter has a wide band (for example, a frequency band of 1 GHz or more in the 23 GHz band), high attenuation, and low loss. Therefore, it is impossible to cover with one type of band-pass filter, and it will be divided into multiple band-pass filters according to the frequency band. Has become enormous.
なお、複数の例えば2種類のバンドパスフィルタ(BPF)を切り替えるために導波管切り替えスイッチを用いるという提案がなされているが、特許文献1の特開昭63-028102号公報「導波管スイッチ」、特許文献2の特開昭63-248201号公報「導波管スイッチ」、特許文献3の特開昭59-047802号公報「導波管スイッチ」、特開2009-212855号公報「導波管スイッチ」などで提案されている導波管切り替えスイッチは、何れも、非常に大がかりであり、屋外装置に組み込むことは、困難である。
It has been proposed that a waveguide changeover switch is used to switch a plurality of, for example, two types of bandpass filters (BPF). Japanese Patent Application Laid-Open No. 63-028102 discloses a “waveguide switch”. Patent Document 2, Japanese Patent Application Laid-Open No. 63-248201, “Waveguide Switch”, Japanese Patent Application Laid-Open No. 59-047802, “Waveguide Switch”, Japanese Patent Application Laid-Open No. 2009-212855, “Waveguide”. All of the waveguide changeover switches proposed in “Tube Switch” and the like are very large and difficult to incorporate in outdoor equipment.
このため、ミリ波帯の信号を送受信するための無線アクセス装置の生産面からもまた使用面からも、無線アクセス装置の種類数を低減することが重要な課題となってきている。
For this reason, it has become an important issue to reduce the number of types of wireless access devices, both in terms of production and use of wireless access devices for transmitting and receiving millimeter-wave band signals.
本発明は、前述のような問題に鑑みてなされたものであり、簡単な切替機構によって複数種類のバンドパスフィルタを切り替えることを可能とするバンドパスフィルタおよび無線アクセス装置を提供することをその目的としている。
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a bandpass filter and a radio access device that can switch a plurality of types of bandpass filters with a simple switching mechanism. It is said.
前述の課題を解決するため、本発明によるバンドパスフィルタおよび無線アクセス装置は、主に、次のような特徴的な構成を採用している。
In order to solve the above-described problems, the band-pass filter and the wireless access device according to the present invention mainly adopt the following characteristic configuration.
(1)本発明によるバンドパスフィルタは、ミリ波帯の信号の中から選択した周波数帯域の信号のみを通過させる導波管からなるバンドパスフィルタであって、H面の中央で2等分に分割した前記導波管によって、通過させる周波数帯域に応じて定まる大きさおよび間隔の方形形状の穴を列状に複数個穿設した薄い金属板を、前記導波管のE面に平行な状態で挟み込む構造としていることを特徴とする。
(2)本発明による無線アクセス装置は、ミリ波帯の無線信号を送受信する無線アクセス装置において、少なくとも前記(1)に記載のバンドパスフィルタを、送信用のバンドパスフィルタおよび受信用のバンドパスフィルタとして実装することを特徴とする。 (1) A band-pass filter according to the present invention is a band-pass filter including a waveguide that passes only a signal in a frequency band selected from millimeter-wave band signals, and is divided into two equal parts at the center of the H plane. A thin metal plate in which a plurality of rectangular holes having a size and interval determined in accordance with a frequency band to be passed are formed in a row by the divided waveguide is parallel to the E plane of the waveguide. It is characterized by having a structure sandwiched between.
(2) A radio access apparatus according to the present invention is a radio access apparatus that transmits and receives millimeter-wave band radio signals. At least the bandpass filter according to (1) is replaced with a bandpass filter for transmission and a bandpass for reception. It is implemented as a filter.
(2)本発明による無線アクセス装置は、ミリ波帯の無線信号を送受信する無線アクセス装置において、少なくとも前記(1)に記載のバンドパスフィルタを、送信用のバンドパスフィルタおよび受信用のバンドパスフィルタとして実装することを特徴とする。 (1) A band-pass filter according to the present invention is a band-pass filter including a waveguide that passes only a signal in a frequency band selected from millimeter-wave band signals, and is divided into two equal parts at the center of the H plane. A thin metal plate in which a plurality of rectangular holes having a size and interval determined in accordance with a frequency band to be passed are formed in a row by the divided waveguide is parallel to the E plane of the waveguide. It is characterized by having a structure sandwiched between.
(2) A radio access apparatus according to the present invention is a radio access apparatus that transmits and receives millimeter-wave band radio signals. At least the bandpass filter according to (1) is replaced with a bandpass filter for transmission and a bandpass for reception. It is implemented as a filter.
本発明のバンドパスフィルタおよび無線アクセス装置によれば、ミリ波帯の無線アクセス装置において不要周波数を除去するために必須のバンドパスフィルタとして、極めて簡単な切替機構によって複数種類のバンドパスフィルタ(BPF)のうち所望の周波数特性を有するバンドパスフィルタに切り替える周波数可変バンドパスフィルタを構成することを可能としているので、無線アクセス装置の種類数を大幅に削減することができるという効果を奏することができる。
According to the bandpass filter and the radio access apparatus of the present invention, a plurality of types of bandpass filters (BPFs) can be used as a bandpass filter indispensable for removing unnecessary frequencies in the millimeter waveband radio access apparatus by an extremely simple switching mechanism. ), It is possible to configure a variable frequency bandpass filter that switches to a bandpass filter having a desired frequency characteristic, so that the number of types of wireless access devices can be greatly reduced. .
以下、本発明によるバンドパスフィルタおよび無線アクセス装置の好適な実施形態について添付図を参照して説明する。
Hereinafter, preferred embodiments of a bandpass filter and a wireless access device according to the present invention will be described with reference to the accompanying drawings.
(本発明の特徴)
本発明の実施形態の説明に先立って、本発明の特徴について、その概要をまず説明する。本発明は、極めて簡単な切替機構によって複数種類のバンドパスフィルタ(BPF)を所望の周波数特性を有するバンドパスフィルタに切り替えることを可能としている。さらに、1枚の薄い金属板(フィン)で、複数のバンドパスフィルタ(BPF)を同時に実現することを可能としている。 (Features of the present invention)
Prior to the description of the embodiments of the present invention, an outline of the features of the present invention will be described first. The present invention makes it possible to switch a plurality of types of bandpass filters (BPF) to bandpass filters having desired frequency characteristics by a very simple switching mechanism. Furthermore, it is possible to simultaneously realize a plurality of band pass filters (BPF) with one thin metal plate (fin).
本発明の実施形態の説明に先立って、本発明の特徴について、その概要をまず説明する。本発明は、極めて簡単な切替機構によって複数種類のバンドパスフィルタ(BPF)を所望の周波数特性を有するバンドパスフィルタに切り替えることを可能としている。さらに、1枚の薄い金属板(フィン)で、複数のバンドパスフィルタ(BPF)を同時に実現することを可能としている。 (Features of the present invention)
Prior to the description of the embodiments of the present invention, an outline of the features of the present invention will be described first. The present invention makes it possible to switch a plurality of types of bandpass filters (BPF) to bandpass filters having desired frequency characteristics by a very simple switching mechanism. Furthermore, it is possible to simultaneously realize a plurality of band pass filters (BPF) with one thin metal plate (fin).
より具体的には、本発明は、導波管をH面(H-plane:磁界面)中央で2等分に分割し、分割した2枚の導波管によって、通過させる周波数帯域に応じて定める大きさと間隔からなる複数個の方形形状の穴を列状に穿設した薄い金属板(フィン)をE面(E-plane:電界面)に平行に挟み込む構造からなるバンドパスフィルタ(BPF)を形成することを特徴としている。
More specifically, the present invention divides the waveguide into two equal parts at the center of the H plane (H-plane: magnetic field plane), and depending on the frequency band to be passed by the two divided waveguides. A band-pass filter (BPF) having a structure in which thin metal plates (fins) each having a plurality of rectangular holes having a predetermined size and interval are formed in a row and sandwiched in parallel with an E plane (E-plane: electric field plane). It is characterized by forming.
さらに、かかるバンドパスフィルタ(BPF)について、1枚の金属板に列ごとに互いに異なる大きさと間隔からなる複数個の方形形状の穴を複数列穿設することによって複数個の導波管として中心周波数が互いに異なる複数個のバンドパスフィルタ(BPF)を形成し、各導波管の両端をT分岐によって接合して、その接合部分に、複数個のバンドパスフィルタ(BPF)のうち、いずれかのバンドパスフィルタ(BPF)に切り替えて動作させるための切替機構(例えば、反射棒を形成するネジを各導波管の両端に穿設したネジ穴に螺合させて、不要な周波数帯域の信号を通過させる導波管への入出力を抑止するという極めて簡単な切替機構)を備えることによって、所望の周波数帯域の信号に切り替えて通過させることが可能な周波数可変バンドパスフィルタ(BPF)を構成していることを特徴としている。
Further, in such a bandpass filter (BPF), a plurality of rectangular holes having different sizes and intervals for each row are formed in one metal plate as a plurality of waveguides. A plurality of band-pass filters (BPF) having different frequencies are formed, both ends of each waveguide are joined by T-branch, and any one of the plurality of band-pass filters (BPF) is joined to the joined portion. Switching mechanism for switching to a band pass filter (BPF) (for example, a screw for forming a reflection rod is screwed into screw holes formed at both ends of each waveguide, and a signal in an unnecessary frequency band is obtained. Is provided with a very simple switching mechanism that suppresses input and output to the waveguide through which the signal passes. It is characterized by constituting a variable band-pass filter (BPF).
さらには、本発明は、前述のような周波数可変バンドパスフィルタをミリ波帯の信号を送受信する無線アクセス装置における送受信用のバンドパスフィルタとして実装することを特徴としている。
Furthermore, the present invention is characterized in that the frequency variable bandpass filter as described above is mounted as a bandpass filter for transmission / reception in a radio access device that transmits / receives a millimeter-wave band signal.
而して、使用する周波数帯域に合わせて、N種類(N:2以上の整数)の異なる中心周波数を有するバンドパスフィルタ(BPF)を周波数可変バンドパスフィルタ(BPF)として切り替えることにより、無線アクセス装置の種類数を大幅に削減することが可能になっている。
Thus, by changing the band pass filter (BPF) having different center frequencies of N types (N: an integer of 2 or more) according to the frequency band to be used as a frequency variable band pass filter (BPF), wireless access The number of types of devices can be greatly reduced.
(本発明の実施形態の構成例)
次に、本発明に係る無線アクセス装置の構成例について図1を用いて説明する。図1は、本発明に係る無線アクセス装置のブロック構成の一例を示すブロック構成図である。 (Configuration example of embodiment of the present invention)
Next, a configuration example of the wireless access device according to the present invention will be described with reference to FIG. FIG. 1 is a block configuration diagram showing an example of a block configuration of a radio access apparatus according to the present invention.
次に、本発明に係る無線アクセス装置の構成例について図1を用いて説明する。図1は、本発明に係る無線アクセス装置のブロック構成の一例を示すブロック構成図である。 (Configuration example of embodiment of the present invention)
Next, a configuration example of the wireless access device according to the present invention will be described with reference to FIG. FIG. 1 is a block configuration diagram showing an example of a block configuration of a radio access apparatus according to the present invention.
ミリ波帯の信号を扱う無線アクセス装置は、一般的に、屋外装置と屋内装置とから構成され、屋外装置と屋内装置との間は、IF(Intermediate Frequency:中間周波数)帯の信号と屋外装置を制御する制御信号と電源とが重畳された同軸ケーブルによって接続される。屋外装置は、図1に示すように、屋内装置との間で送受信するIF信号、制御信号、電源を分離したり、合成したりするマルチプレクサ(Multiplexer:回線多重化装置)11、送信IF信号をRF(Radio Frequency:無線周波数)信号へ変換して増幅する送信回路部12、受信RF信号を増幅して受信IF信号へ変換する受信回路部13、不要波を除去する送信バンドパスフィルタ14および受信バンドパスフィルタ15から構成される。
A wireless access device that handles millimeter-wave band signals is generally composed of an outdoor device and an indoor device. Between the outdoor device and the indoor device, an IF (Intermediate Frequency: intermediate frequency) band signal and an outdoor device are used. Are connected by a coaxial cable in which a control signal for controlling the power and a power source are superimposed. As shown in FIG. 1, the outdoor device has an IF signal, a control signal, and a power source that are transmitted and received with the indoor device, and a multiplexer (Multiplexer) 11 that separates and combines the power, and a transmission IF signal. A transmission circuit unit 12 that converts and amplifies an RF (Radio Frequency) signal, a reception circuit unit 13 that amplifies the received RF signal and converts it to a reception IF signal, a transmission bandpass filter 14 that removes unnecessary waves, and reception It is composed of a band pass filter 15.
ここで、図1に示すように、送信バンドパスフィルタ14は、いわゆる周波数可変バンドパスフィルタとして構成されており、中心周波数が異なる2個の送信バンドパスフィルタ14a(中心周波数f1)および送信バンドパスフィルタ14b(中心周波数f2)と該2個の送信バンドパスフィルタ14a,14bを使用周波数帯域に応じて切り替えるために入出力両端に備えた2個の切り替えスイッチ14c、14dとから構成され、受信バンドパスフィルタ15も、いわゆる周波数可変バンドパスフィルタとして構成されており、中心周波数が異なる2個の受信バンドパスフィルタ15a(中心周波数f1′)および受信バンドパスフィルタ15b(中心周波数f2′)と該2個の受信バンドパスフィルタ15a,15bを使用周波数帯域に応じて切り替えるために入出力両端に備えた2個の切り替えスイッチ15c、15dとから構成されている。
Here, as shown in FIG. 1, the transmission bandpass filter 14 is configured as a so-called variable frequency bandpass filter, and includes two transmission bandpass filters 14a (center frequency f1) and transmission bandpass having different center frequencies. It comprises a filter 14b (center frequency f2) and two change- over switches 14c and 14d provided at both input and output ends in order to switch the two transmission bandpass filters 14a and 14b according to the used frequency band. The pass filter 15 is also configured as a so-called frequency variable bandpass filter, and includes two reception bandpass filters 15a (center frequency f1 ') and reception bandpass filter 15b (center frequency f2') having different center frequencies. Frequency of receiving band- pass filters 15a and 15b Two changeover switches 15c provided in the input and output ends in order to switch in accordance with the frequency band, and a 15d.
なお、図1に示す本発明に係る無線アクセス装置の屋外装置と従来の無線アクセス装置の屋外装置との違いをより明確に示すために、図5に従来の無線アクセス装置のブロック構成を示している。図5は、従来の無線アクセス装置のブロック構成の一例を示すブロック構成図であり、図1に示す本発明に係る無線アクセス装置の屋外装置とは異なり、送信バンドパスフィルタ、受信バンドパスフィルタはそれぞれ1個ずつの構成となっている。すなわち、図5に示すように、従来の無線アクセス装置の屋外装置は、マルチプレクサ21、送信回路部22、受信回路部23、送信バンドパスフィルタ24および受信バンドパスフィルタ25から構成される。
In order to more clearly show the difference between the outdoor device of the wireless access device according to the present invention shown in FIG. 1 and the outdoor device of the conventional wireless access device, FIG. 5 shows a block configuration of the conventional wireless access device. Yes. FIG. 5 is a block diagram illustrating an example of a block configuration of a conventional wireless access device. Unlike the outdoor device of the wireless access device according to the present invention illustrated in FIG. 1, a transmission bandpass filter and a reception bandpass filter are Each has one configuration. That is, as shown in FIG. 5, the outdoor device of the conventional wireless access device is configured by a multiplexer 21, a transmission circuit unit 22, a reception circuit unit 23, a transmission bandpass filter 24 and a reception bandpass filter 25.
次に、図1に示す本発明に係る無線アクセス装置の屋外装置に搭載される送信バンドパスフィルタ14、受信バンドパスフィルタ15の構造について、図2Aと図2Bを用いて説明する。図2Aと図2Bは、本発明に係る無線アクセス装置の屋外装置に搭載されるバンドパスフィルタ(BPF)の構造の一例を示す構造図であり、図2Aは、2種類のバンドパスフィルタに対する切替機構を備えたバンドパスフィルタ(BPF)を分解して斜め上から眺めた様子を示す分解斜視図であり、図2Bは、2種類のバンドパスフィルタに対する切替機構を備えたバンドパスフィルタ(BPF)の中央部の断面構造を示す断面図である。なお、周波数可変バンドパスフィルタとして構成する必要がある図1に示す送信バンドパスフィルタ14、受信バンドパスフィルタ15のいずれも、図2A、図2Bに示すような同一構造の導波管によって構成すれば良い。
Next, the structures of the transmission bandpass filter 14 and the reception bandpass filter 15 mounted on the outdoor device of the wireless access device according to the present invention shown in FIG. 1 will be described with reference to FIGS. 2A and 2B. 2A and 2B are structural diagrams showing an example of the structure of a bandpass filter (BPF) mounted on an outdoor device of a wireless access device according to the present invention, and FIG. 2A shows switching for two types of bandpass filters. FIG. 2B is an exploded perspective view showing a state in which a bandpass filter (BPF) having a mechanism is disassembled and viewed obliquely from above, and FIG. 2B is a bandpass filter (BPF) having a switching mechanism for two types of bandpass filters. It is sectional drawing which shows the cross-section of the center part. Note that both the transmission bandpass filter 14 and the reception bandpass filter 15 shown in FIG. 1 that need to be configured as a frequency variable bandpass filter are configured by waveguides having the same structure as shown in FIGS. 2A and 2B. It ’s fine.
2種類のバンドパスフィルタに対する切替機構を備えたバンドパスフィルタ(周波数可変バンドパスフィルタ)は、図2Aに示すように、薄い金属板1をH面(H-plane:磁界面)の中央で2等分に分割した導波管2によってE面(E-plane:電界面)に平行に挟み込むことによって構成される。金属板1には、図2Bに示すように、バンドパスフィルタの周波数特性(つまり、通過させる周波数帯域)に応じて決定される間隔と大きさの方形形状の穴4a,4bが2列の列状に複数個穿設されている。
As shown in FIG. 2A, a bandpass filter (frequency variable bandpass filter) having a switching mechanism for two types of bandpass filters has a thin metal plate 1 at the center of the H plane (H-plane: magnetic field plane). It is configured by being sandwiched in parallel with the E plane (E-plane: electric field plane) by the waveguide 2 divided into equal parts. As shown in FIG. 2B, the metal plate 1 has two rows of rectangular holes 4a and 4b having intervals and sizes determined according to the frequency characteristics of the band-pass filter (that is, the frequency band to be passed). A plurality of holes are perforated.
つまり、図2Aに示すように、周波数可変バンドパスフィルタとして、周波数特性が異なる2種類のバンドパスフィルタ(中心周波数f1,f2)を1枚の金属板1上で形成するために、金属板1には、異なる間隔と大きさとからなる方形形状の穴4a,4bが2列に穿設されており、方形形状の穴4a,4bが穿設されている金属板1の部分を2等分に分割した導波管2によって挟み込むことによって、2種類のバンドパスフィルタを形成している。さらに、形成した2種類のバンドパスフィルタを外部回路と入出力する信号の入出力端と接続するために、形成した2種類のバンドパスフィルタを逆相等振幅で励振するT分岐によって接合し、この接合部分には、周波数可変バンドパスフィルタとして、2種類のバンドパスフィルタのいずれを動作させるかを切り替えるための切替機構を備えるようにしている。
That is, as shown in FIG. 2A, in order to form two types of band-pass filters (center frequencies f1, f2) having different frequency characteristics as a frequency variable band-pass filter on a single metal plate 1, the metal plate 1 The rectangular holes 4a and 4b having different intervals and sizes are formed in two rows, and the portion of the metal plate 1 in which the rectangular holes 4a and 4b are formed is divided into two equal parts. By sandwiching between the divided waveguides 2, two types of band-pass filters are formed. Furthermore, in order to connect the two types of formed bandpass filters to the input / output ends of signals input / output to / from an external circuit, the two types of formed bandpass filters are joined by a T-branch that excites with opposite phase equal amplitude, The joint portion is provided with a switching mechanism for switching which of the two types of band pass filters is operated as the frequency variable band pass filter.
つまり、2種類のバンドパスフィルタを切り替えるための切替機構(図1に示す送信側の切り替えスイッチ14c、14dまたは受信側の切り替えスイッチ15c、15d)として、図2Aと図2Bに示すように、2種類のバンドパスフィルタを形成している2列の導波管2それぞれの両端に、反射棒3を配設することができるように、ネジを螺合するためのネジ穴A,Aおよびネジ穴B,Bが穿設されている。本実施形態においては、切替機構を構成するための反射棒3をネジによって実現し、2列の導波管2(2種類のバンドパスフィルタ)のうち、動作を抑止しようとする導波管2(バンドパスフィルタ)側のネジ穴A,Aまたはネジ穴B,Bに、反射棒3を形成するネジを螺合させることによって、いずれか一方の導波管2(バンドパスフィルタ)を動作させる例を示している。
That is, as shown in FIGS. 2A and 2B, a switching mechanism for switching between two types of bandpass filters (transmission-side changeover switches 14c and 14d or reception-side changeover switches 15c and 15d shown in FIG. 1) Screw holes A and A for screwing screws and screw holes so that the reflecting rods 3 can be disposed at both ends of each of the two rows of waveguides 2 forming a kind of band-pass filter. B and B are drilled. In the present embodiment, the reflection rod 3 for constituting the switching mechanism is realized by a screw, and the waveguide 2 which is to suppress the operation among the two rows of waveguides 2 (two types of bandpass filters). One of the waveguides 2 (bandpass filter) is operated by screwing a screw forming the reflecting rod 3 into the screw hole A, A or screw hole B, B on the (bandpass filter) side. An example is shown.
(本発明の実施形態の動作例)
次に、図1、図2A、図2Bに示した無線アクセス装置におけるバンドパスフィルタ切替機構の動作について、その一例を説明する。 (Operation example of the embodiment of the present invention)
Next, an example of the operation of the bandpass filter switching mechanism in the wireless access device shown in FIGS. 1, 2A, and 2B will be described.
次に、図1、図2A、図2Bに示した無線アクセス装置におけるバンドパスフィルタ切替機構の動作について、その一例を説明する。 (Operation example of the embodiment of the present invention)
Next, an example of the operation of the bandpass filter switching mechanism in the wireless access device shown in FIGS. 1, 2A, and 2B will be described.
例えば、図1の無線アクセス装置における周波数可変バンドパスフィルタとして動作する送信バンドパスフィルタ14において、2種類の送信バンドパスフィルタ14a,14bのうち、送信中心周波数f1の周波数特性を有する送信バンドパスフィルタ14aを動作させる場合には、切り替えスイッチ14c、14dとして、反射棒3のネジを導波管2の両端のネジ穴B,Bに螺合させて、反射棒3によりバンドパスフィルタ14bとして動作する導波管2への信号の入出力を抑止し、逆に、送信中心周波数f2の周波数特性を有する送信バンドパスフィルタ14bを動作させる場合には、切り替えスイッチ14c、14dとして、反射棒3のネジを導波管2の両端のネジ穴A,Aに螺合させて、反射棒3によりバンドパスフィルタ14aとして動作する導波管2への信号の入出力を抑止する。かかる切替機構は、周波数可変バンドパスフィルタとして動作する受信バンドパスフィルタ15の場合も同様である。
For example, in the transmission bandpass filter 14 that operates as a frequency variable bandpass filter in the wireless access device of FIG. 1, the transmission bandpass filter having the frequency characteristic of the transmission center frequency f1 out of the two types of transmission bandpass filters 14a and 14b. When the switch 14a is operated, as the changeover switches 14c and 14d, the screws of the reflecting bar 3 are screwed into the screw holes B and B at both ends of the waveguide 2, and the reflecting bar 3 operates as a band pass filter 14b. When the input / output of signals to / from the waveguide 2 is suppressed and the transmission bandpass filter 14b having the frequency characteristic of the transmission center frequency f2 is operated, the screws of the reflector 3 are used as the changeover switches 14c and 14d. Is screwed into the screw holes A and A at both ends of the waveguide 2, and the band pass filter 14 is reflected by the reflector 3. To suppress the input and output of signals to the waveguide 2 that operates as a. This switching mechanism is the same for the reception bandpass filter 15 that operates as a frequency variable bandpass filter.
かくのごとく、適用しようとする周波数帯域に応じて、反射棒3を形成するネジを、2列の導波管2それぞれの両端に穿設されているネジ穴A,Aまたはネジ穴B,Bに螺合させる操作を行うのみで、簡単に、2種類のバンドパスフィルタ(中心周波数f1のバンドパスフィルタ、中心周波数f2のバンドパスフィルタ)を切り替えることが可能な周波数可変バンドパスフィルタとして利用することができる。
As described above, according to the frequency band to be applied, the screws forming the reflecting rod 3 are screw holes A and A or screw holes B and B formed in both ends of the two rows of waveguides 2. It is used as a frequency variable bandpass filter that can easily switch between two types of bandpass filters (a bandpass filter having a center frequency f1 and a bandpass filter having a center frequency f2) simply by performing an operation of screwing into the band. be able to.
図3は、図2Aと図2Bに示すバンドパスフィルタの周波数特性のシミュレーション結果を示す特性図であり、反射棒3のネジを導波管2の両端のネジ穴B,Bに螺合させて中心周波数f1の周波数特性を有するバンドパスフィルタとして動作させた場合の通過特性とリターンロス特性、および、反射棒3のネジを導波管2の両端のネジ穴A,Aに螺合させて中心周波数f2の周波数特性を有するバンドパスフィルタとして動作させた場合の通過特性とリターンロス特性とを、それぞれ図示している。なお、図3においては、中心周波数f1が21.5GHzであり、中心周波数f2が22.1GHzである場合についてシミュレーションした結果を示している。
FIG. 3 is a characteristic diagram showing a simulation result of the frequency characteristics of the bandpass filter shown in FIGS. 2A and 2B. The screw of the reflector 3 is screwed into the screw holes B and B at both ends of the waveguide 2. The pass characteristic and the return loss characteristic when operated as a bandpass filter having the frequency characteristic of the center frequency f1, and the screw of the reflector 3 are screwed into the screw holes A and A at both ends of the waveguide 2 to be centered. The pass characteristic and the return loss characteristic when operated as a bandpass filter having the frequency characteristic of the frequency f2 are respectively illustrated. Note that FIG. 3 shows a simulation result in the case where the center frequency f1 is 21.5 GHz and the center frequency f2 is 22.1 GHz.
無線周波数帯としてミリ波帯の23GHz帯を使用する場合、無線アクセス装置としては、一般に、1,200MHz程度の周波数帯域をカバーバンドとして有していることが必要である。このような広い周波数帯域を1種類のバンドパスフィルタでカバーすることは不可能であり、たとえ、最適な設計を行ったとしても、図3のf1通過特性曲線あるいはf2通過特性曲線に示すように、1種類のバンドパスフィルタ単独としては700MHz程度の周波数帯域をカバーすることが限界となっている。
When using the millimeter wave band of 23 GHz as a radio frequency band, the radio access device generally needs to have a frequency band of about 1,200 MHz as a cover band. It is impossible to cover such a wide frequency band with one type of band-pass filter. As shown in the f1 pass characteristic curve or the f2 pass characteristic curve in FIG. One type of bandpass filter alone is limited in covering a frequency band of about 700 MHz.
このため、従来の無線アクセス装置においては、前述したように、少なくとも2種類の無線アクセス装置、すなわち、f1通過特性曲線のような周波数特性を有するバンドパスフィルタを備えた無線アクセス装置とf2通過特性曲線のような周波数特性を有するバンドパスフィルタを備えた無線アクセス装置とを、別々に用意することが必要になっていた。したがって、従来の無線アクセス装置においては、それぞれの周波数帯域をカバーする無線アクセス装置を、無線区間として対向して配置することが必要になるので、送受信周波数を入れ替えた合計4種類の無線アクセス装置を用意することが必要であり、装置個数の増大を招いていた。
Therefore, in the conventional radio access device, as described above, at least two types of radio access devices, that is, a radio access device including a bandpass filter having a frequency characteristic such as an f1 pass characteristic curve, and an f2 pass characteristic It has been necessary to separately prepare a radio access apparatus including a bandpass filter having a frequency characteristic like a curve. Therefore, in the conventional radio access device, it is necessary to arrange radio access devices that cover the respective frequency bands as radio sections facing each other. Therefore, a total of four types of radio access devices in which transmission and reception frequencies are switched are provided. It was necessary to prepare, and the number of devices was increased.
しかし、本実施形態においては、図3のシミュレーション結果に示すように、反射棒3を装着する位置を最適に位置決めすることによって、図2A、図2Bのごとく1枚の金属板にて2種類のバンドパスフィルタを構成するようにしても、それぞれのバンドパスフィルタの特性として良好な通過特性とリターンロス特性が得られ、中心周波数がf1(=21.5GHz)の周波数特性を有するバンドパスフィルタと中心周波数がf2(=22.1GHz)の周波数特性を有するバンドパスフィルタとのそれぞれが、700MHz程度の周波数帯域を良好な特性でカバーすることができる。
However, in the present embodiment, as shown in the simulation result of FIG. 3, by appropriately positioning the position where the reflector 3 is mounted, two kinds of metal plates are used as shown in FIGS. 2A and 2B. Even if the band pass filter is configured, a good pass characteristic and return loss characteristic can be obtained as characteristics of each band pass filter, and a band pass filter having a frequency characteristic with a center frequency of f1 (= 21.5 GHz) Each bandpass filter having a frequency characteristic with a center frequency f2 (= 22.1 GHz) can cover a frequency band of about 700 MHz with good characteristics.
かくのごとき2種類のバンドパスフィルタの切替機構を備えたバンドパスフィルタを、周波数可変バンドパスフィルタとして、無線アクセス装置の送信側と受信側とに備え、反射棒3を形成するネジを、2列の導波管2それぞれの両端に穿設されているネジ穴A,A、ネジ穴B,Bの2対のネジ穴のうち、いずれか1対のネジ穴に螺合させるだけの極めて簡単な操作によって、中心周波数f1の周波数特性を有する送受信回路として動作させることもできるし、中心周波数f2(f2≠f1)の周波数特性を有する送受信回路として動作させることもできる。
A bandpass filter having a switching mechanism for two types of bandpass filters as described above is provided as a frequency variable bandpass filter on the transmitting side and the receiving side of the wireless access device, and screws 2 forming the reflector 3 are provided. It is extremely simple just to screw into one of the two screw holes A and A and screw holes B and B formed at both ends of the waveguides 2 in the row. By a simple operation, it can be operated as a transmission / reception circuit having the frequency characteristic of the center frequency f1, or can be operated as a transmission / reception circuit having the frequency characteristic of the center frequency f2 (f2 ≠ f1).
したがって、反射棒3による切替機構を適用することによって、かかる2種類のバンドパスフィルタを有する図2A、図2Bのような構造のバンドパスフィルタ(周波数可変バンドパスフィルタ)は、図3の(f1通過特性曲線+f2通過特性曲線)の総合通過特性曲線に示すように、両者のバンドパスフィルタの特性を合計した合計周波数特性として、21.15GHzから22.45GHzまでに至る1,300MHzの周波数帯域をカバーバンドとすることができ、23GHz帯の無線周波数帯において必要とする1,200MHzという広い周波数帯域を十分にカバーすることができることが分かる。
Therefore, by applying a switching mechanism using the reflecting rod 3, the bandpass filter (frequency variable bandpass filter) having the structure shown in FIGS. 2A and 2B having the two types of bandpass filters can be obtained as shown in FIG. As shown in the overall pass characteristic curve of the pass characteristic curve + f2 pass characteristic curve), the frequency band of 1,300 MHz from 21.15 GHz to 22.45 GHz is obtained as the total frequency characteristic obtained by summing the characteristics of both band pass filters. It can be seen that it can be a cover band and can sufficiently cover a wide frequency band of 1,200 MHz required in the radio frequency band of 23 GHz band.
つまり、前述のような2種類のバンドパスフィルタの切替機構を備えたバンドパスフィルタ(周波数可変バンドパスフィルタ)を、無線アクセス装置の送信側と受信側とに備えることにより、反射棒3を形成するネジを、2列の導波管2それぞれの両端に穿設されているネジ穴A,Aまたはネジ穴B,Bに螺合させるだけの極めて簡単な操作によって、中心周波数f1の周波数特性を有する送受信回路として動作させることもできるし、中心周波数f2(f2≠f1)の周波数特性を有する送受信回路として動作させることもできる。この結果、かかるバンドパスフィルタ(周波数可変バンドパスフィルタ)を搭載した無線アクセス装置を、送受信周波数を入れ替えて、無線区間に対向して配置することによって、無線アクセス装置は、従来の1対分が4個の場合に比して、1対向分を2個に半減することが可能となる。
That is, the reflection rod 3 is formed by providing the band-pass filter (frequency variable band-pass filter) having the switching mechanism of the two types of band-pass filters as described above on the transmission side and the reception side of the wireless access device. The frequency characteristic of the center frequency f1 can be obtained by an extremely simple operation of simply screwing the screws to be screwed into the screw holes A and A or the screw holes B and B formed at both ends of the two rows of waveguides 2. It can be operated as a transmission / reception circuit having the same frequency, or can be operated as a transmission / reception circuit having a frequency characteristic of the center frequency f2 (f2 ≠ f1). As a result, a wireless access device equipped with such a bandpass filter (frequency variable bandpass filter) is placed opposite to the wireless section by changing the transmission / reception frequency. Compared to the case of four, it is possible to halve the amount of one facing to two.
(本発明の他の実施形態の構成例)
前述の図2A、図2Bに示すバンドパスフィルタ(周波数可変バンドパスフィルタ)においては、2種類のパンドパスフィルタを切り替えるように、1枚の金属板1を2列の導波管2によって挟み込む2分岐の場合を例示したが、1枚の金属板を3列の導波管によって挟み込む3分岐として、3種類のバンドパスフィルタを切り替えるような構成も可能である。 (Configuration example of another embodiment of the present invention)
In the band-pass filter (frequency variable band-pass filter) shown in FIG. 2A and FIG. 2B described above, asingle metal plate 1 is sandwiched between two rows of waveguides 2 so as to switch between two types of Pand-pass filters. Although the case of branching has been illustrated, a configuration in which three types of band-pass filters are switched as three branches sandwiching one metal plate by three rows of waveguides is also possible.
前述の図2A、図2Bに示すバンドパスフィルタ(周波数可変バンドパスフィルタ)においては、2種類のパンドパスフィルタを切り替えるように、1枚の金属板1を2列の導波管2によって挟み込む2分岐の場合を例示したが、1枚の金属板を3列の導波管によって挟み込む3分岐として、3種類のバンドパスフィルタを切り替えるような構成も可能である。 (Configuration example of another embodiment of the present invention)
In the band-pass filter (frequency variable band-pass filter) shown in FIG. 2A and FIG. 2B described above, a
図4は、本発明に係る無線アクセス装置の屋外装置に搭載されるバンドパスフィルタ(BPF)の構造の他の例を示す構造図であり、1枚の金属板を3列の導波管によって挟み込むことにより、中心周波数が互いに異なる3種類のバンドパスフィルタを構成している例を示している。
FIG. 4 is a structural diagram showing another example of the structure of a band-pass filter (BPF) mounted on the outdoor device of the wireless access device according to the present invention. One metal plate is constituted by three rows of waveguides. An example is shown in which three types of bandpass filters having different center frequencies are configured by being sandwiched.
図4に示すように、3種類のバンドパスフィルタに対する切替機構を備えたバンドパスフィルタ(周波数可変バンドパスフィルタ)は、図2A、図2Bの場合と同様、薄い金属板5をH面(H-plane:磁界面)の中央で2等分に分割した導波管6によってE面(E-plane:電界面)に平行に挟み込むことによって構成される。金属板5には、バンドパスフィルタの周波数特性(つまり、通過させる周波数帯域)に応じて決定される間隔と大きさとからなる方形形状の穴7a,7b,7cが3列の列状に複数個穿設されている。
As shown in FIG. 4, a bandpass filter (frequency variable bandpass filter) provided with a switching mechanism for three types of bandpass filters has a thin metal plate 5 formed on an H surface (H -Plane: magnetic field plane) is sandwiched in parallel with the E plane (E-plane: electric field plane) by the waveguide 6 divided into two equal parts. The metal plate 5 has a plurality of rectangular holes 7a, 7b, 7c each having an interval and a size determined according to the frequency characteristics of the bandpass filter (that is, the frequency band to be passed) in three rows. It has been drilled.
つまり、周波数可変バンドパスフィルタの周波数特性として、周波数特性が異なる3種類のバンドパスフィルタ(中心周波数f1,f2,f3)を1枚の金属板5上で形成するために、金属板5には、異なる間隔と大きさとからなる方形形状の穴7a,7b,7cが3列に穿設されており、方形形状の穴7a,7b,7cが穿設されている金属板5の部分を2等分に分割した導波管6によって挟み込むことによって、3種類のバンドパスフィルタを形成する。さらに、形成した3種類のバンドパスフィルタを外部回路と入出力する信号の入出力端と接続するために、形成した3種類のバンドパスフィルタを逆相等振幅で励振するT分岐によって接合し、この接合部分には、周波数可変バンドパスフィルタとして、3種類のバンドパスフィルタのいずれを動作させるかを切り替えるための切替機構を備えるようにしている。
That is, as the frequency characteristics of the frequency variable bandpass filter, in order to form three types of bandpass filters (center frequencies f1, f2, and f3) having different frequency characteristics on one metal plate 5, The rectangular holes 7a, 7b and 7c having different intervals and sizes are formed in three rows, and the portion of the metal plate 5 in which the rectangular holes 7a, 7b and 7c are formed is divided into 2 etc. Three types of band-pass filters are formed by sandwiching them between the divided waveguides 6. Further, in order to connect the formed three types of band-pass filters to the input / output ends of signals to be input / output to / from an external circuit, the formed three types of band-pass filters are joined by a T-branch that excites with opposite phase equal amplitudes. The joint portion is provided with a switching mechanism for switching which of the three types of bandpass filters is operated as a frequency variable bandpass filter.
該切替機構としては、図4に示すように、3種類のバンドパスフィルタを形成している3列の導波管6それぞれの両端に、反射棒を配設することができるように、反射棒となるネジを螺合するためのネジ穴A,A、ネジ穴B,Bおよびネジ穴C,Cが穿設されている。
As the switching mechanism, as shown in FIG. 4, the reflecting rods can be disposed at both ends of each of the three rows of waveguides 6 forming three types of bandpass filters. Screw holes A and A, screw holes B and B, and screw holes C and C for screwing the screws are formed.
3種類のバンドパスフィルタのうち、中心周波数f1の周波数特性を有するバンドパスフィルタとして動作させる場合には、反射棒のネジを導波管6の両端のネジ穴B,Bおよびネジ穴C,Cに螺合させて、反射棒3により中心周波数f2、f3のバンドパスフィルタとして動作する導波管6への信号の入出力を抑止する。また、中心周波数f2の周波数特性を有するバンドパスフィルタとして動作させる場合には、反射棒のネジを導波管6の両端のネジ穴C,Cおよびネジ穴A,Aに螺合させて、反射棒3により中心周波数f3、f1のバンドパスフィルタとして動作する導波管6への信号の入出力を抑止する。また、中心周波数f3の周波数特性を有するバンドパスフィルタとして動作させる場合には、反射棒のネジを導波管6の両端のネジ穴A,Aおよびネジ穴B,Bに螺合させて、反射棒3により中心周波数f1、f2のバンドパスフィルタとして動作する導波管6への信号の入出力を抑止する。
When operating as a band-pass filter having the frequency characteristic of the center frequency f1 among the three types of band-pass filters, the screws of the reflector are screw holes B and B and screw holes C and C at both ends of the waveguide 6. And the input / output of a signal to the waveguide 6 that operates as a band-pass filter having the center frequencies f2 and f3 is suppressed by the reflector 3. Further, when operating as a band-pass filter having a frequency characteristic of the center frequency f2, the reflection rod screw is screwed into the screw holes C and C and the screw holes A and A at both ends of the waveguide 6 for reflection. The rod 3 suppresses input / output of signals to / from the waveguide 6 operating as a bandpass filter having center frequencies f3 and f1. Further, when operating as a bandpass filter having a frequency characteristic of the center frequency f3, the reflection rod screw is screwed into the screw holes A and A and the screw holes B and B at both ends of the waveguide 6 for reflection. The rod 3 suppresses input / output of signals to / from the waveguide 6 that operates as a bandpass filter having the center frequencies f1 and f2.
かくのごとき3種類のバンドパスフィルタを切り替える切替機構を備えたバンドパスフィルタ(周波数可変バンドパスフィルタ)を、無線アクセス装置の送信側と受信側とに備えることにより、反射棒を形成するネジを、3列の導波管6それぞれの両端に穿設されているネジ穴A,A、ネジ穴B,B、ネジ穴C,Cの3対のネジ穴のうち、いずれか2対のネジ穴に螺合させるだけの極めて簡単な操作によって、中心周波数f1の周波数特性を有する送受信回路として動作させることもできるし、中心周波数f2(f2≠f1)の周波数特性を有する送受信回路として動作させることもできるし、中心周波数f3(f3≠f2≠f1)の周波数特性を有する送受信回路として動作させることもできる。
By providing a band-pass filter (frequency variable band-pass filter) having a switching mechanism for switching between three types of band-pass filters as described above on the transmitting side and the receiving side of the wireless access device, a screw that forms a reflecting rod is provided. Two pairs of screw holes among the three pairs of screw holes A and A, screw holes B and B, and screw holes C and C formed at both ends of each of the three rows of waveguides 6 It is possible to operate as a transmission / reception circuit having the frequency characteristic of the center frequency f1 or to operate as a transmission / reception circuit having the frequency characteristic of the center frequency f2 (f2 ≠ f1) by an extremely simple operation only by screwing to the center. It can also be operated as a transmission / reception circuit having a frequency characteristic of a center frequency f3 (f3 ≠ f2 ≠ f1).
さらには、本発明によるバンドパスフィルタは、2種類や3種類のバンドパスフィルタを切り替える場合のみならず、より一般化して、N種類(N:2以上の整数)のバンドパスフィルタを切り替える切替機構を備えたバンドパスフィルタ(周波数可変バンドパスフィルタ)として構成することもできる。
Furthermore, the band-pass filter according to the present invention is not only for switching between two or three types of band-pass filters, but more generally, a switching mechanism for switching N-type (N: integer greater than or equal to 2) band-pass filters. It can also be configured as a bandpass filter (frequency variable bandpass filter) provided with
以上、本発明の好適実施例の構成を説明した。しかし、斯かる実施例は、本発明の単なる例示に過ぎず、何ら本発明を限定するものではないことに留意されたい。本発明の要旨を逸脱することなく、特定用途に応じて種々の変形変更が可能であることが、当業者には容易に理解できよう。
The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such examples are merely illustrative of the invention and do not limit the invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention.
この出願は、2010年5月20日に出願された日本出願特願2010-116401を基礎とする優先権を主張し、その開示の全てをここに取り込む。
This application claims priority based on Japanese Patent Application No. 2010-116401 filed on May 20, 2010, the entire disclosure of which is incorporated herein.
本発明は、ミリ波帯の無線アクセス装置の屋外装置に利用することができる。
The present invention can be used for an outdoor device of a millimeter wave band wireless access device.
1 金属板
2 導波管
3 反射棒(ネジ)
4a 方形形状の穴
4b 方形形状の穴
5 金属板
6 導波管
7a 方形形状の穴
7b 方形形状の穴
7c 方形形状の穴
11 マルチプレクサ(Multiplexer:回線多重化装置)
12 送信回路部
13 受信回路部
14 送信バンドパスフィルタ
14a 送信バンドパスフィルタ(中心周波数f1)
14b 送信バンドパスフィルタ(中心周波数f2)
14c 切り替えスイッチ
14d 切り替えスイッチ
15 受信バンドパスフィルタ
15a 受信バンドパスフィルタ(中心周波数f1′)
15b 受信バンドパスフィルタ(中心周波数f2′)
15c 切り替えスイッチ
15d 切り替えスイッチ
21 マルチプレクサ
22 送信回路部
23 受信回路部
24 送信バンドパスフィルタ
25 受信バンドパスフィルタ 1Metal plate 2 Waveguide 3 Reflector (screw)
4a Square-shapedhole 4b Square-shaped hole 5 Metal plate 6 Waveguide 7a Square-shaped hole 7b Square-shaped hole 7c Square-shaped hole 11 Multiplexer (Multiplexer)
12transmission circuit unit 13 reception circuit unit 14 transmission bandpass filter 14a transmission bandpass filter (center frequency f1)
14b Transmission bandpass filter (center frequency f2)
14c selector switch 14d selector switch 15 reception band pass filter 15a reception band pass filter (center frequency f1 ')
15b Reception band pass filter (center frequency f2 ')
15c changeover switch 15d changeover switch 21 multiplexer 22 transmission circuit unit 23 reception circuit unit 24 transmission bandpass filter 25 reception bandpass filter
2 導波管
3 反射棒(ネジ)
4a 方形形状の穴
4b 方形形状の穴
5 金属板
6 導波管
7a 方形形状の穴
7b 方形形状の穴
7c 方形形状の穴
11 マルチプレクサ(Multiplexer:回線多重化装置)
12 送信回路部
13 受信回路部
14 送信バンドパスフィルタ
14a 送信バンドパスフィルタ(中心周波数f1)
14b 送信バンドパスフィルタ(中心周波数f2)
14c 切り替えスイッチ
14d 切り替えスイッチ
15 受信バンドパスフィルタ
15a 受信バンドパスフィルタ(中心周波数f1′)
15b 受信バンドパスフィルタ(中心周波数f2′)
15c 切り替えスイッチ
15d 切り替えスイッチ
21 マルチプレクサ
22 送信回路部
23 受信回路部
24 送信バンドパスフィルタ
25 受信バンドパスフィルタ 1
4a Square-shaped
12
14b Transmission bandpass filter (center frequency f2)
15b Reception band pass filter (center frequency f2 ')
Claims (6)
- ミリ波帯の信号の中から選択した周波数帯域の信号のみを通過させる導波管からなるバンドパスフィルタであって、H面の中央で2等分に分割した前記導波管によって、通過させる周波数帯域に応じて定まる大きさおよび間隔の方形形状の穴を列状に複数個穿設した薄い金属板を、前記導波管のE面に平行な状態で挟み込む構造としていることを特徴とするバンドパスフィルタ。 A bandpass filter comprising a waveguide that passes only a signal in a frequency band selected from millimeter waveband signals, and the frequency that is passed by the waveguide divided into two equal parts at the center of the H plane. A band having a structure in which a thin metal plate in which a plurality of rectangular holes having a size and interval determined according to a band are formed in a row is sandwiched in a state parallel to the E surface of the waveguide. Path filter.
- 前記金属板に、通過させる周波数帯域に応じて異なる大きさおよび間隔の前記方形形状の穴の列を複数列穿設して、複数列の導波管として周波数特性が互いに異なる複数のバンドパスフィルタを形成し、かつ、外部回路と入出力する信号の入出力端と接続させるための前記複数列の各導波管それぞれの両端に、いずれの導波管をバンドパスフィルタとして動作させるかを切り替える切替機構を備えることにより、可変周波数バンドパスフィルタとして動作させることを特徴とする請求項1に記載のバンドパスフィルタ。 A plurality of band-pass filters having different frequency characteristics as a plurality of rows of waveguides by drilling a plurality of rows of the rectangular holes having different sizes and intervals according to the frequency band to be passed through the metal plate And switching which waveguide is operated as a band-pass filter at each end of each of the plurality of columns of waveguides for connection to the input / output ends of signals input / output to / from an external circuit The bandpass filter according to claim 1, wherein the bandpass filter is operated as a variable frequency bandpass filter by including a switching mechanism.
- 前記切替機構として、前記複数列の各導波管それぞれの両端に、動作させない導波管への信号の入力および当該導波管からの信号の出力を抑止する反射棒を装着することが可能な装着機構を備えていることを特徴とする請求項2に記載のバンドパスフィルタ。 As the switching mechanism, it is possible to attach a reflecting rod for suppressing input of a signal to the waveguide not to be operated and output of the signal from the waveguide at both ends of each of the plurality of rows of waveguides. The band-pass filter according to claim 2, further comprising a mounting mechanism.
- 前記装着機構として、前記反射棒をネジにより構成し、前記複数列の各導波管それぞれの両端に、前記反射棒のネジと螺合させることができるネジ穴を穿設していることを特徴とする請求項3に記載のバンドパスフィルタ。 As the mounting mechanism, the reflecting rod is constituted by a screw, and screw holes that can be screwed with the screws of the reflecting rod are formed at both ends of each of the plurality of rows of waveguides. The band-pass filter according to claim 3.
- 前記信号の入出力端と前記複数列の各導波管との接続部分を、T分岐として構成していることを特徴とする請求項2ないし4のいずれかに記載のバンドパスフィルタ。 The band-pass filter according to any one of claims 2 to 4, wherein a connecting portion between the input / output terminal of the signal and each of the plurality of rows of waveguides is configured as a T-branch.
- ミリ波帯の無線信号を送受信する無線アクセス装置において、請求項1ないし5のいずれかに記載のバンドパスフィルタを、送信用のバンドパスフィルタおよび受信用のバンドパスフィルタとして実装することを特徴とする無線アクセス装置。 A radio access apparatus for transmitting and receiving millimeter-wave band radio signals, wherein the bandpass filter according to any one of claims 1 to 5 is mounted as a transmission bandpass filter and a reception bandpass filter. Wireless access device.
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CN114976566A (en) * | 2022-07-04 | 2022-08-30 | 艾博白云电气技术(扬州)有限公司 | Automatic assembly process of active filter |
IT202100008195A1 (en) * | 2021-04-01 | 2022-10-01 | Commscope Italy Srl | RADIO FREQUENCY ROTARY SWITCHES |
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