CN113054369A - Filter and communication equipment - Google Patents
Filter and communication equipment Download PDFInfo
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- CN113054369A CN113054369A CN201911383501.1A CN201911383501A CN113054369A CN 113054369 A CN113054369 A CN 113054369A CN 201911383501 A CN201911383501 A CN 201911383501A CN 113054369 A CN113054369 A CN 113054369A
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- filter
- cavity
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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
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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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
- H01P1/207—Hollow waveguide filters
- H01P1/209—Hollow waveguide filters comprising one or more branching arms or cavities wholly outside the main waveguide
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Abstract
The application discloses wave filter and communication equipment, this wave filter includes: a housing having a first direction and a second direction perpendicular to the first direction; the filtering branch is arranged on the shell and consists of seven filtering cavities which are sequentially coupled, the seven filtering cavities of the filtering branch are sequentially coupled through window coupling, and the bandwidth range of the filtering branch is 697-961 MHz. Through the mode, the cross coupling element is not required to be arranged, the cost of the filter is reduced, and the window coupling consistency of the filter is good.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a filter and a communications device.
Background
In a mobile communication device, a desired signal is modulated to form a modulated signal, the modulated signal is carried on a high-frequency carrier signal, the modulated signal is transmitted to the air through a transmitting antenna, the signal in the air is received through a receiving antenna, and the signal received by the receiving antenna does not include the desired signal but also includes harmonics and noise signals of other frequencies. The signal received by the receiving antenna needs to be filtered by a filter to remove unnecessary harmonic and noise signals. Therefore, the designed filter must precisely control its bandwidth.
The inventor of the present application found in long-term research and development work that, in a filter in the prior art, at least one cross-coupling zero point is included in a plurality of filter cavities, and a cross-coupling element, such as a flying bar or a metal coupling rib, needs to be disposed between two filter cavities that are cross-coupled, resulting in high cost of the filter.
Disclosure of Invention
The application provides a filter to solve the technical problem that the cost of the filter is high in the prior art.
An embodiment of the present application provides a filter, including:
a housing having a first direction and a second direction perpendicular to the first direction;
the filtering branch is arranged on the shell and consists of seven filtering cavities which are sequentially coupled, the seven filtering cavities of the filtering branch are sequentially coupled through window coupling, and the bandwidth range of the filtering branch is 697-961 MHz; seven filter cavities of the filter branch circuit are sequentially coupled through window coupling, a cross coupling element is not needed to be arranged, the cost of the filter is reduced, and the window coupling consistency of the filter is good; in addition, the bandwidth range of the filtering branch is 697-961MHz, the bandwidth of the filtering branch can be accurately controlled, and the design requirement is met.
Optionally, the seven filter cavities of the filter branch include a first filter cavity, a second filter cavity, a third filter cavity, a fourth filter cavity, a fifth filter cavity, a sixth filter cavity and a seventh filter cavity, which are sequentially coupled;
the first filtering cavity, the second filtering cavity, the third filtering cavity, the fourth filtering cavity, the fifth filtering cavity, the sixth filtering cavity and the seventh filtering cavity are linearly arranged, and an included angle between a connecting line between the center of the sixth filtering cavity and the center of the seventh filtering cavity and a central dividing line of the shell in the first direction is an acute angle; seven filter cavities of the filter branch circuit are linearly arranged, so that the design and debugging of the filter are facilitated.
Optionally, the size of the first filtering cavity and the size of the seventh filtering cavity are both smaller than the size of the second filtering cavity, so as to reduce the space occupied by the first filtering cavity and the seventh filtering cavity and reduce the volume of the filter.
Optionally, the size of the first filter cavity and the size of the seventh filter cavity are equal;
the size of second filtering cavity respectively with the size of third filtering cavity the size of fourth filtering cavity the size of fifth filtering cavity with the size of sixth filtering cavity equals, and the space of rational utilization filtering cavity does benefit to the design of wave filter.
Optionally, the filter further includes a first port and a second port disposed on the housing, the first filtering cavity is connected to the first port, and the seventh filtering cavity is connected to the second port.
Optionally, the filter further includes a low-pass branch and a third port, the low-pass branch is connected between the second port and the third port, and the low-pass branch and the filtering branch share the second port, so that the number of taps of the filter is reduced, the cost of the filter is reduced, and the size of the filter is reduced.
Optionally, the low-pass branch includes five low through grooves and a low-pass piece, the low through piece is disposed in the five low through grooves, one end of the low through piece is connected to the second port, and the other end of the low through piece is connected to the third port.
Optionally, the first low through groove, the second low through groove, the third low through groove, the fourth low through groove and the fifth low through groove of the low-pass branch are in a row and are sequentially arranged along the second direction, and the five low through grooves of the low-pass branch are regularly arranged, so that the filter design is facilitated.
Optionally, the bandwidth of the low-pass branch is in a range of: 1709 + 2701MHz, the bandwidth of the low-pass branch can be accurately controlled, and the design requirement is met.
The embodiment of the application also provides communication equipment, which comprises an antenna and a radio frequency unit connected with the antenna, wherein the radio frequency unit comprises the filter for filtering the radio frequency signal.
Compared with the prior art, the seven filter cavities of the filter branch circuit are sequentially coupled through window coupling without arranging a cross coupling element, so that the cost of the filter is reduced, and the window coupling consistency of the filter is good; in addition, the bandwidth range of the filtering branch is 697-961MHz, the bandwidth of the filtering branch can be accurately controlled, and the design requirement is met.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of a filter provided herein;
FIG. 2 is a schematic diagram of a topology of a filtering branch provided in the present application;
FIG. 3 is a diagram illustrating simulation results of a filter provided herein;
FIG. 4 is a schematic diagram of another embodiment of a filter provided herein;
fig. 5 is a schematic structural diagram of an embodiment of a communication device provided in the present application.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present application.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a filter provided in the present application. The filter of the present embodiment includes a housing 11 and a filter branch 12, the housing 11 has a first direction L1 and a second direction L2 perpendicular to the first direction L1, the first direction L1 may be a length direction of the housing 11, and the second direction L2 may be a width direction of the housing 11. The filtering branch 12 is arranged on the shell 11 and is composed of seven filtering cavities which are coupled in sequence.
As shown in fig. 1 and 2, fig. 2 is a schematic diagram of a topology of a filtering branch circuit provided in the present application. The seven filtering cavities of the filtering branch 12 comprise a first filtering cavity a1, a second filtering cavity a2, a third filtering cavity A3, a fourth filtering cavity a4, a fifth filtering cavity a5, a sixth filtering cavity a6 and a seventh filtering cavity a7 which are coupled in sequence; seven filter cavities of the filter branch 12 are sequentially coupled through window coupling, that is, the first filter cavity a1 and the second filter cavity a2 are coupled through windows, the second filter cavity a2 and the third filter cavity A3 are coupled through windows, the third filter cavity A3 and the fourth filter cavity a4 are coupled through windows, the fourth filter cavity a4 and the fifth filter cavity a5 are coupled through windows, the fifth filter cavity a5 and the sixth filter cavity A6 are coupled through windows, and the sixth filter cavity A6 and the seventh filter cavity a7 are coupled through windows; and a cross coupling element is not required to be arranged, so that the cost of the filter is reduced, and the window coupling consistency of the filter is good.
The first filter cavity A1, the second filter cavity A2, the third filter cavity A3, the fourth filter cavity A4, the fifth filter cavity A5, the sixth filter cavity A6 and the seventh filter cavity A7 are linearly arranged, namely, the center of the first filter cavity A1, the center of the second filter cavity A2, the center of the third filter cavity A3, the center of the fourth filter cavity A4, the center of the fifth filter cavity A5, the center of the sixth filter cavity A6 and the center of the seventh filter cavity A7 are connected to form a straight line, so that the design and debugging of the filter are facilitated. The angle a between the line connecting the center of the sixth filter chamber a6 and the center of the seventh filter chamber a7 and the bisector L of the housing 11 in the first direction L1 is an acute angle, and may be 25 ° to 60 °, optionally 25 °, 30 °, 45 °, 55 ° or 60 °.
As shown in fig. 1, the size of the first filter cavity a1 and the size of the seventh filter cavity a7 are both smaller than the size of the second filter cavity a2, so as to reduce the space occupied by the first filter cavity a1 and the seventh filter cavity a7, and reduce the volume of the filter. Further, the space of the filter outside the first and seventh filter chambers a1 and a7 may be used to provide a support or tap of the filter, etc. The size of the first filter chamber a1 and the size of the seventh filter chamber a1 are equal; the size of the second filter cavity A2 is equal to the size of the third filter cavity A3, the size of the fourth filter cavity A4, the size of the fifth filter cavity A5 and the size of the sixth filter cavity A6, so that the space of the filter cavities is reasonably utilized, and the design of the filter is facilitated.
The filter of this embodiment further comprises a first port and a second port provided on the housing 11, to which the first filter chamber a1 is connected, and a seventh filter chamber a7 is connected. The first port and the second port may be taps of a filter, the first port may be an input port, and the second port may be an output port.
In the filtering branch 12, the coupling bandwidth between the first port and the first filtering cavity a1 is in the range of 231-; the coupling bandwidth between the first filter cavity A1 and the second filter cavity A2 is in the range of 193-220 MHz; the coupling bandwidth between the second filter cavity A2 and the third filter cavity A3 is in the range of 139-159 MHz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity A4 is in the range of 130 MHz and 150 MHz; the coupling bandwidth between the fourth filter cavity A4 and the fifth filter cavity A5 is in the range of 130 MHz and 150 MHz; the coupling bandwidth between the fifth filter cavity A5 and the sixth filter cavity A6 is in the range of 139-159 MHz; the coupling bandwidth between the sixth filter cavity A6 and the seventh filter cavity A7 is in the range of 193-220 MHz; the coupling bandwidth between the seventh filter cavity a7 and the second port is in the range of 231 and 261 MHz.
The resonant frequencies of the first filter cavity a1 through the seventh filter cavity a7 of the filter branch 12 are in the following ranges in order: 817-819MHz, and 817-819 MHz.
By setting the resonant frequencies of the first filter cavity a1 to the seventh filter cavity a7 and the coupling bandwidths of the filter cavities as described above, the bandwidth of the filter branch 12 ranges from: 697 and 961MHz, the bandwidth of the filtering branch 12 can be accurately controlled, and the design requirement of the filter can be satisfied.
As shown in fig. 3, fig. 3 is a schematic diagram of simulation results of the filter provided in the present application. The simulation of the filtering branch 12 in this embodiment is shown as the frequency band curve 31 in fig. 3, so that the simulated bandwidth of the filtering branch 12 is within the range of 697-961MHz, which meets the design requirement of the filter and can accurately control the bandwidth of the filtering branch 12. In addition, in the range of 1710-2700MHz, the rejection of the filtering branch 12 is greater than or equal to 40dB, so that the out-of-band rejection and other performances of the filtering branch 12 can be improved.
As shown in fig. 4, fig. 4 is a schematic structural diagram of another embodiment of the filter provided in the present application. The filter disclosed in the present embodiment is described on the basis of the above embodiments: the filter further comprises a low-pass branch 13 and a third port, the low-pass branch 13 is connected between the second port and the third port, the low-pass branch 13 and the filtering branch 12 share the second port, the number of taps of the filter is reduced, the cost of the filter is reduced, and the size of the filter is reduced.
As shown in fig. 4, the low-pass branch 13 includes five low-pass grooves and a low-pass plate 14, the low-pass plate 14 is disposed in the five low-pass grooves, one end of the low-pass plate 14 is connected to the second port, and the other end of the low-pass plate 14 is connected to the third port. Specifically, the five low through grooves of the low-pass branch 13 are a first low through groove B1, a second low through groove B2, a third low through groove B3, a fourth low through groove B4 and a fifth low through groove B5, the first low through groove B1, the second low through groove B2, the third low through groove B3, the fourth low through groove B4 and the fifth low through groove B5 are in a row and are sequentially arranged along the second direction L2, and the five low through grooves of the low-pass branch 13 are regularly arranged, so as to facilitate the design of the filter. The bandwidth of the low-pass branch 13 ranges from: 1709 + 2701MHz, the bandwidth of the low pass branch 13 can be accurately controlled to meet the design requirement.
As shown in fig. 3, the simulation of the low-pass branch 13 of the present embodiment is the frequency band curve 32 shown in fig. 3, so that the bandwidth simulated by the low-pass branch 13 is within the range of 1709-2701MHz, which meets the design requirement of the filter, and the bandwidth of the low-pass branch 13 can be precisely controlled. In addition, in the range of 698-960MHz, the rejection of the low-pass branch 13 is greater than or equal to 40dB, so that the out-of-band rejection and other performances of the low-pass branch 13 can be improved.
The filtering branch 12 of the present application may be a transmitting filtering cavity or a receiving filtering branch. In addition, the first filter cavity a1, the second filter cavity a2, the third filter cavity A3, the fourth filter cavity a4, the fifth filter cavity a5, the sixth filter cavity a6 and the seventh filter cavity a7 of the present application are all circular in fig. 1 and 4, and the filter cavities may be provided in other shapes such as a square, a rectangle or an irregular shape in the actual production of the filter.
The present application further provides a communication device, as shown in fig. 5, fig. 5 is a schematic structural diagram of an embodiment of the communication device provided in the present application. The communication device of the present embodiment includes an antenna 62 and a radio frequency unit 61. The antenna 62 and the radio frequency unit 61 can be installed on a base station, and can also be installed on objects such as a street lamp; the antenna 62 is connected to a Radio Unit (RRU) 61. The radio frequency unit 61 comprises the filter disclosed in the above embodiments for filtering the radio frequency signal.
In other embodiments, the rf Unit 61 may be integrated with the Antenna 62 to form an Active Antenna Unit (AAU).
The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.
Claims (10)
1. A filter, characterized in that the filter comprises:
a housing having a first direction and a second direction perpendicular to the first direction;
the filtering branch is arranged on the shell and consists of seven filtering cavities which are sequentially coupled, the seven filtering cavities of the filtering branch are sequentially coupled through window coupling, and the bandwidth range of the filtering branch is 697-961 MHz.
2. The filter of claim 1,
the seven filtering cavities of the filtering branch circuit comprise a first filtering cavity, a second filtering cavity, a third filtering cavity, a fourth filtering cavity, a fifth filtering cavity, a sixth filtering cavity and a seventh filtering cavity which are sequentially coupled;
the first filtering cavity, the second filtering cavity, the third filtering cavity, the fourth filtering cavity, the fifth filtering cavity, the sixth filtering cavity and the seventh filtering cavity are arranged linearly, a connecting line between the centers of the sixth filtering cavity and the seventh filtering cavity and an included angle of the shell between the middle branch lines in the first direction are acute angles.
3. The filter of claim 2,
the size of the first filter cavity and the size of the seventh filter cavity are both smaller than the size of the second filter cavity.
4. The filter of claim 3,
the size of the first filter cavity is equal to that of the seventh filter cavity;
the size of the second filter cavity is equal to the size of the third filter cavity, the size of the fourth filter cavity, the size of the fifth filter cavity and the size of the sixth filter cavity respectively.
5. The filter of claim 4,
the filter further comprises a first port and a second port which are arranged on the shell, the first filtering cavity is connected with the first port, and the seventh filtering cavity is connected with the second port.
6. The filter according to any one of claims 1 to 5,
the filter further comprises a low-pass branch and a third port, the low-pass branch being connected between the second port and the third port.
7. The filter according to claim 6, wherein the low-pass branch comprises five low-pass grooves and a low-pass plate, the low-pass plate is arranged in the five low-pass grooves, one end of the low-pass plate is connected with the second port, and the other end of the low-pass plate is connected with the third port.
8. The filter according to claim 7, wherein the first low through groove, the second low through groove, the third low through groove, the fourth low through groove and the fifth low through groove of the low-pass branch are in a column and are sequentially arranged along the second direction.
9. The filter of claim 8,
the bandwidth range of the low-pass branch is as follows: 1709 and 2701 MHz.
10. A communication device, characterized in that the communication device comprises an antenna and a radio frequency unit connected to the antenna, the radio frequency unit comprising a filter according to any of claims 1-9 for filtering radio frequency signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911383501.1A CN113054369A (en) | 2019-12-27 | 2019-12-27 | Filter and communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911383501.1A CN113054369A (en) | 2019-12-27 | 2019-12-27 | Filter and communication equipment |
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| Publication Number | Publication Date |
|---|---|
| CN113054369A true CN113054369A (en) | 2021-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911383501.1A Pending CN113054369A (en) | 2019-12-27 | 2019-12-27 | Filter and communication equipment |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101924263A (en) * | 2009-06-11 | 2010-12-22 | 深圳市大富科技股份有限公司 | Cavity filter |
| CN202172114U (en) * | 2011-08-01 | 2012-03-21 | 南京广顺网络通信设备有限公司 | Broadband double-frequency combiner |
| CN103201897A (en) * | 2012-09-26 | 2013-07-10 | 华为技术有限公司 | Cavity filter |
| CN105611982A (en) * | 2014-03-25 | 2016-05-25 | 华为终端有限公司 | Battery, communications terminal, and communications system |
| CN108475836A (en) * | 2015-12-24 | 2018-08-31 | 华为技术有限公司 | A kind of filter and Wireless Communication Equipment |
| CN110416675A (en) * | 2019-08-01 | 2019-11-05 | 京信通信技术(广州)有限公司 | High low pass combiner |
| CN209691910U (en) * | 2018-12-31 | 2019-11-26 | 深圳市大富科技股份有限公司 | A kind of filter, duplexer and communication equipment |
| CN209691912U (en) * | 2018-12-31 | 2019-11-26 | 深圳市大富科技股份有限公司 | A kind of duplexer and communication equipment |
| CN209691911U (en) * | 2018-12-31 | 2019-11-26 | 深圳市大富科技股份有限公司 | A kind of duplexer and communication equipment |
-
2019
- 2019-12-27 CN CN201911383501.1A patent/CN113054369A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101924263A (en) * | 2009-06-11 | 2010-12-22 | 深圳市大富科技股份有限公司 | Cavity filter |
| CN202172114U (en) * | 2011-08-01 | 2012-03-21 | 南京广顺网络通信设备有限公司 | Broadband double-frequency combiner |
| CN103201897A (en) * | 2012-09-26 | 2013-07-10 | 华为技术有限公司 | Cavity filter |
| CN105611982A (en) * | 2014-03-25 | 2016-05-25 | 华为终端有限公司 | Battery, communications terminal, and communications system |
| CN108475836A (en) * | 2015-12-24 | 2018-08-31 | 华为技术有限公司 | A kind of filter and Wireless Communication Equipment |
| CN209691910U (en) * | 2018-12-31 | 2019-11-26 | 深圳市大富科技股份有限公司 | A kind of filter, duplexer and communication equipment |
| CN209691912U (en) * | 2018-12-31 | 2019-11-26 | 深圳市大富科技股份有限公司 | A kind of duplexer and communication equipment |
| CN209691911U (en) * | 2018-12-31 | 2019-11-26 | 深圳市大富科技股份有限公司 | A kind of duplexer and communication equipment |
| CN110416675A (en) * | 2019-08-01 | 2019-11-05 | 京信通信技术(广州)有限公司 | High low pass combiner |
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Application publication date: 20210629 |
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