CN113497318A - Band elimination filter and communication equipment - Google Patents
Band elimination filter and communication equipment Download PDFInfo
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- CN113497318A CN113497318A CN202010271321.0A CN202010271321A CN113497318A CN 113497318 A CN113497318 A CN 113497318A CN 202010271321 A CN202010271321 A CN 202010271321A CN 113497318 A CN113497318 A CN 113497318A
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- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
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Abstract
The application discloses band elimination filter and communication equipment. The band elimination filter includes: transmission lines arranged in a first direction; the seven resonators are sequentially coupled with the transmission line along a first direction to form seven coupling zeros of the band elimination filter, and one side of each resonator, which is close to the transmission line, is provided with an opening; and the seven connecting sheets are arranged in one-to-one correspondence to the openings, one ends of the connecting sheets are coupled with the resonators, and the other ends of the connecting sheets are connected with the transmission lines. In this way, the out-of-band rejection performance of the band-stop filter can be improved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a band-stop filter and a communications device.
Background
In a mobile communication base station system, a filter is usually adopted to filter a received signal of a receiving antenna so as to filter an unwanted signal outside a specific frequency range transmitted by a transmitting antenna, and obtain a signal carrying communication data within the specific frequency range, that is, a wanted signal.
When the bandwidth of the useful signal transmitted by the antenna is wide and the bandwidth of the unwanted signal to be filtered is narrow, the filtering of the unwanted signal is usually realized by a band-stop filter. The band-elimination filter attenuates the input signal and the intermodulation signal because the resonant frequency of the band-elimination filter is out of band, so that compared with a band-pass filter, the band-elimination filter has larger intermodulation and power capacity and better consistency of product performance.
The inventor of the application finds that the existing band-stop filter has poor performances such as out-of-band rejection and the like in long-term research and development work, and cannot control the bandwidth well.
Disclosure of Invention
The technical problem that this application mainly solved provides band elimination filter and communication equipment to improve band elimination filter's outband rejection performance.
In order to solve the technical problem, the application adopts a technical scheme that: a band stop filter is provided. The band-stop filter includes: transmission lines arranged in a first direction; the seven resonators are sequentially coupled with the transmission line along a first direction to form seven coupling zeros of the band elimination filter, and one side, close to the transmission line, of each resonator is provided with an opening; seven connecting sheets which are arranged corresponding to the openings one by one, wherein one end of each connecting sheet is coupled with the resonator, and the other end of each connecting sheet is connected with the transmission line.
Optionally, the seven resonators are divided into two rows arranged along a second direction, and the two rows of resonators are respectively located at two sides of the transmission line, where the second direction is perpendicular to the first direction; a first resonator, a third resonator, a fifth resonator and a seventh resonator of the seven resonators are arranged in a row in sequence along the first direction; a second resonator, a fourth resonator and a sixth resonator of the seven resonators are arranged in a row in sequence along the first direction; the projection of the center of the second resonator in the first direction is located between the projection of the center of the first resonator and the projection of the center of the third resonator in the first direction. The seven resonators are arranged in two rows, and the two rows of resonators are arranged in a staggered mode, so that the cavity arrangement of the band elimination filter is regular, the processing is facilitated, and the size of the band elimination filter is reduced.
Optionally, the resonator comprises: a resonant cavity; the resonance rod is arranged in the resonance cavity and comprises a U-shaped side wall and a hollow inner cavity formed by the U-shaped side wall; and one end of the tuning rod is arranged in the hollow inner cavity. The resonant frequency of the resonator can be adjusted by adjusting the depth of the tuning rod within the hollow cavity.
Optionally, two ends of the U-shaped side wall are bent and extended in a direction away from the hollow inner cavity, so as to form a disc-shaped structure at two ends of the U-shaped side wall. The disc-shaped structures at the two ends of the U-shaped side wall can increase the signal coupling amount of the resonance rod.
Optionally, the band-stop filter further includes seven adjusting rods, the seven adjusting rods are arranged in one-to-one correspondence with the seven resonators, one end of each adjusting rod extends into the resonant cavity, and the distance between each adjusting rod and the connecting sheet is smaller than a preset distance. The coupling time delay of the resonator is adjusted by adjusting the depth of the adjusting rod in the resonant cavity.
Optionally, the band-stop filter further includes a cover plate covering the seven resonators, the cover plate is provided with a plurality of mounting holes, and the other ends of the tuning rod and the adjusting rod are fixed to the cover plate through the mounting holes. The cover plate can enable the resonant cavity to be a closed body, and electromagnetic signal leakage is prevented.
Optionally, the resonant cavity is a square cylinder. For circular cylinder resonant cavity, square column can increase resonant cavity's volume.
Optionally, the band-stop filter further comprises: the input port is connected with the input end of the transmission line; and the output port is connected with the output end of the transmission line. The input port and the output port are respectively used for inputting and outputting electromagnetic signals.
Optionally, the band of the band elimination filter is 703-915 MHz and 930-960 MHz.
In order to solve the above technical problem, the present application adopts another technical solution: a communication device is provided. The communication equipment comprises an antenna and a radio frequency unit connected with the antenna, wherein the radio frequency unit comprises the band elimination filter and is used for filtering radio frequency signals.
The beneficial effect of this application is: different from the prior art, the band-stop filter of the embodiment of the present application includes: transmission lines arranged in a first direction; the seven resonators are sequentially coupled with the transmission line along a first direction to form seven coupling zeros of the band elimination filter, and one side of each resonator, which is close to the transmission line, is provided with an opening; and the seven connecting sheets are arranged in one-to-one correspondence to the openings, one ends of the connecting sheets are coupled with the resonators, and the other ends of the connecting sheets are connected with the transmission lines. In this way, the band-stop filter in the embodiment of the application realizes seven coupling zeros through seven resonators, and can well control the band bandwidth of the band-stop filter, so that the out-of-band rejection performance of the band-stop filter can be improved.
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 structural diagram of an embodiment of a band stop filter according to the present application;
FIG. 2 is a schematic diagram of the topology of the band stop filter of the embodiment of FIG. 1;
fig. 3 is a schematic diagram of the structure of the resonator in the band-stop filter of the embodiment of fig. 1;
FIG. 4 is a schematic structural diagram of a combined structure of a resonance rod and a tuning rod in the resonator of the embodiment of FIG. 3;
FIG. 5 is a schematic diagram of an equivalent circuit structure of the band stop filter of the embodiment of FIG. 1;
FIG. 6 is a diagram illustrating a simulated structure of the band stop filter of the embodiment of FIG. 1;
fig. 7 is a schematic structural diagram of an embodiment of the communication device of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first" and "second" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The present application firstly proposes a band-stop filter, as shown in fig. 1 to 6, fig. 1 is a schematic structural diagram of an embodiment of the band-stop filter of the present application; FIG. 2 is a schematic diagram of the topology of the band stop filter of the embodiment of FIG. 1; fig. 3 is a schematic diagram of the structure of the resonator in the band-stop filter of the embodiment of fig. 1; FIG. 4 is a schematic structural diagram of a combined structure of a resonance rod and a tuning rod in the resonator of the embodiment of FIG. 3; FIG. 5 is a schematic diagram of an equivalent circuit structure of the band stop filter of the embodiment of FIG. 1; fig. 6 is a schematic diagram of a simulation structure of the band stop filter of the embodiment of fig. 1. The band elimination filter 10 of the present embodiment includes: a transmission line 11, seven resonators a1-a7, and seven bond pads 12, wherein the transmission line 11 is arranged along a first direction x; seven resonators A1-A7 are sequentially coupled with the transmission line 11 along the first direction x to form seven coupling zeros of the band-stop filter 10, and one side of each resonator, which is close to the transmission line 11, is provided with an opening (not shown); seven connecting pieces 12 are provided in one-to-one correspondence with the openings, one end of the connecting piece 12 is coupled with the corresponding resonator, and the other end of the connecting piece 12 is connected with the transmission line 11.
Wherein the seven resonators a1-a7 include: the resonator comprises a first resonator A1, a second resonator A2, a third resonator A3, a fourth resonator A4, a fifth resonator A5, a sixth resonator A6 and a seventh resonator A7.
The resonator is a communication device for frequency selection and signal suppression, mainly plays a role of frequency control, and is required by communication devices related to frequency transmission and reception.
Different from the prior art, the seven resonators a1-a7 of the band-stop filter 10 of the present embodiment can realize seven coupling zeros, and can well control the bandwidth of the band-stop filter 10, so that the out-of-band rejection performance of the band-stop filter 10 can be improved.
The transmission line 11 of the present embodiment can be implemented by a microstrip line with 1/4 wavelength, that is, a 1/4 wavelength transmission line. The microstrip line is a microwave transmission line formed by a single conductor strip supported on a dielectric substrate; it is suitable for making planar structure transmission line of microwave integrated circuit; compared with metal waveguide, it has the advantages of small volume, light weight, wide frequency band, high reliability, low manufacturing cost, etc. The dielectric substrate is usually made of a material with high dielectric constant and low microwave loss; the conductor should have the characteristics of high conductivity, good stability, strong adhesion with the substrate, and the like.
The present embodiment can change the matching impedance of the transmission line 11 as the 1/4-wavelength transmission line 11 by changing the size of the microstrip line. Of course in other embodiments, 1/4 wavelength transmission lines may be implemented using, for example, coaxial, stripline, and suspended lines.
Alternatively, as shown in fig. 1, the seven resonators a1-a7 are divided into two rows arranged along a second direction y, and the two rows of resonators are respectively located at two sides of the transmission line 11, wherein the second direction y is perpendicular to the first direction x; the first resonator a1, the third resonator A3, the fifth resonator a4 and the seventh resonator a7 of the seven resonators a1-a7 are arranged in sequence in a row along a first direction x; the second resonator A2, the fourth resonator A4 and the sixth resonator A6 in the seven resonators A1-A7 are arranged in sequence in a row along a first direction x; the projection of the center of the second resonator a2 in the first direction x is located between the center of the first resonator a1 and the projection of the center of the third resonator A3 in the first direction x.
From the above analysis, it can be seen that the seven resonators a1-a7 are arranged in two rows, and the two rows of resonators are arranged in a staggered manner, so that the cavity arrangement of the band-stop filter 10 is regular, and the processing and the volume reduction are facilitated.
The seven resonators a1-a7 have the same structure, and the structure of the first resonator a1 in the seven resonators a1-a7 is described below, without describing the structures of the other resonators in detail.
Alternatively, as shown in fig. 1, 3 and 4, the first resonator a1 includes: a resonant cavity 21, a resonant rod 20 and a tuning rod 30; wherein the resonant rod 20 is arranged in the resonant cavity 21; the resonant rod 20 comprises a U-shaped side wall 210 and a hollow inner cavity 220 formed by the U-shaped side wall, and one end of the tuning rod 30 is arranged in the hollow inner cavity 220; the resonant frequency of the first resonator a1 can be adjusted by adjusting the depth of the tuning rod 30 within the hollow interior 220.
The resonant rod 20, the hollow cavity 220 and the tuning rod 30 of the present embodiment are coaxially disposed. The coaxial arrangement has the characteristics of high Q value (Q is a quality factor), high loss characteristic, high electromagnetic shielding, small size and easy realization. Of course, in other embodiments, non-coaxial arrangements may be used instead of the coaxial arrangement.
Optionally, as shown in fig. 4, two ends of the U-shaped sidewall 210 of the present embodiment are bent and extended in a direction away from the hollow cavity 220, so as to form a disc-shaped structure at two ends of the U-shaped sidewall 210; wherein, two ends of the U-shaped sidewall 210 form a disc-shaped structure and are arranged parallel to the bottom of the U-shaped sidewall 210.
The disc-shaped structures at both ends of the U-shaped sidewall 210 can increase the signal coupling amount of the resonant bar 20.
Alternatively, the first resonator a1 of the present embodiment may be a metal filter cavity, and the resonant rod 20 may be a metal resonant rod.
The material of the resonant rod 20 of the present embodiment may be the cut 1215 MS. Of course, in other embodiments, the resonant rod may be an M8 or M4 screw rod, and the like, and made of copper or silver.
The resonant cavity of the first resonator a1 is a square column, and the square column can increase the volume of the resonant cavity 21 relative to a circular column resonant cavity.
The seven resonators A1-A7 are the same in size, so that the production is convenient and the cost is saved. The side lengths of the seven resonators a1-a7 may be less than 80mm, e.g., 79mm, 78mm, 77mm, etc.
Optionally, as shown in fig. 3, a mounting post 40 is further disposed on the resonant cavity 21, and the U-shaped sidewall 210 is fixed on the mounting post 40. The resonant rod 20 is fixed to the resonant cavity 21 by a mounting post 40.
Further, a mounting hole (not shown) is formed in the bottom of the U-shaped side wall 210, one end of the mounting post 40 is fixed to the bottom wall of the resonant cavity 21, and the other end of the mounting post 40 is mounted in the mounting hole, so as to fix the resonant rod 20 to the mounting post 40; the mounting holes may be through holes, the mounting holes may be threaded holes, and the mounting posts 40 are studs. In other embodiments, the mounting hole may also be a blind hole.
Further, the band elimination filter 10 further includes a cover plate (not shown) disposed on the seven resonators a1-a7 to make the resonant cavity 21 an enclosure to prevent leakage of electromagnetic signals; the cover plate is provided with a plurality of mounting holes (not shown); the other end of the tuning rod 30 is threaded on the cover plate, wherein the tuning rod 30 can be a metal screw.
Optionally, as shown in fig. 1, the band-stop filter 10 further includes seven adjusting rods 13, which are disposed in one-to-one correspondence with the seven resonators a1-a 7; one end of the adjusting rod 13 extends into the resonant cavity, and the coupling time delay of the resonator is adjusted by adjusting the depth of the adjusting rod 13 in the resonant cavity 21; the distance between the adjusting rod 13 and the connecting piece 12 is smaller than the preset distance. The sensitivity of the adjusting lever 13 to the coupling delay adjustment can be improved by disposing the adjusting lever 13 close to the connecting piece 12. The smaller the distance between the adjustment lever 13 and the connecting piece 12, the higher the sensitivity of the adjustment lever 13 to the coupling delay adjustment.
The seven resonators A1-A7 are sequentially arranged adjacent to the transmission line 11 along the main coupling path, windows (not shown) are arranged between the seven resonators A1-A7 and the transmission line and used for arranging the connecting pieces 13, and the seven resonators A1-A7 carry out electromagnetic energy transmission with the transmission line 11 through the connecting pieces 13.
Each of the seven resonators a1-a7 generates an inductive coupling zero, which can improve the out-of-band rejection performance of the band-stop filter 10 and accurately control the frequency band.
The coupling zero is also referred to as a transmission zero. The transmission zero is the transmission function of the filter is equal to zero, namely, the electromagnetic energy cannot pass through the network on the frequency point corresponding to the transmission zero, so that the full isolation effect is achieved, the suppression effect on signals outside the passband is achieved, and the high isolation among the multiple passbands can be better achieved.
Further, as shown in fig. 1, the band elimination filter 10 of the present embodiment further includes: an input port S connected to an input end (an end coupled to the first filter a 1) of the transmission line 11 of the band elimination filter 10, and an output port L connected to an output end (an end coupled to the seventh resonator a 7) of the transmission line 11 of the band elimination filter 10.
The input port S and the output port L are taps and are used for inputting and outputting electromagnetic signals.
The equivalent circuit of the band-stop filter 10 of the present embodiment is shown in fig. 5, where the impedance Z1 at the input port S is about 50 ohms, and the impedance Z2 at the output port L is about 50 ohms; to ensure that the electromagnetic signal is transmitted between the resonators a1-a7 of the band elimination filter 10, impedance adjusters ZV need to be provided between the input port S and the first resonator a1, between adjacent resonators on the main coupling path, and between the seventh resonator a7 and the output port L, to achieve impedance matching.
The simulation result of the band elimination filter 10 of the present embodiment is shown in fig. 6, and it can be seen from fig. 6 that the frequency bands of the band elimination filter 10 of the present embodiment are about 703MHz to 915MHz and 930MHz to 960MHz, and the frequency band curve S1 shows that the band elimination filter has seven coupling zeros (not shown); the suppression of the frequency point 703MHz (m1) is-3.094 dB, the suppression of the frequency point 915MHz (m2) is-0.169 dB, the suppression of the frequency point 930MHz (m3) is-0.495 dB, the suppression of the frequency point 960MHz (m4) is-0.015 dB, the suppression of the frequency point 921MHz (m5) is-50.628 dB, and the suppression of the frequency point 925MHz (m6) is-50.153 dB, so that the band elimination filter 10 has the performances of small in-band loss (less than 0.5dB), strong anti-interference capability (the band outside 5MHz is more than 45dB suppression), large power capacity (the normal temperature and the normal pressure are more than 2000W) and the like.
The band elimination filter 10 of the present embodiment is a7 th order microwave filter applied to a 5G mobile communication system. The band elimination filter 10 has low loss, and can ensure low energy consumption of the communication module; the 7-order resonant cavity combination design of the band elimination filter 10 is realized, and a transmission zero structure is introduced, so that the band elimination filter has strong anti-jamming capability and can ensure that a communication system is not interfered by stray signals; the band elimination filter 10 has the advantages of simple design scheme, low cost, good structure and electrical property stability; the band-stop filter 10 can meet the requirements of the current novel 5G mobile communication system, and mainly relates to the 700-900M frequency band.
The present application further provides a communication device, as shown in fig. 7, fig. 7 is a schematic structural diagram of an embodiment of the communication device of the present application. The communication device of the embodiment comprises an antenna 32 and a radio frequency unit 31 connected with the antenna 32, wherein the radio frequency unit 31 comprises the band-stop filter 10 as described in the above embodiment, and the filter 10 is used for filtering radio frequency signals.
In other embodiments, the rf Unit 31 may be integrated with the Antenna 32 to form an Active Antenna Unit (AAU).
Different from the prior art, the band-stop filter of the embodiment of the present application includes: transmission lines arranged in a first direction; the seven resonators are sequentially coupled with the transmission line along a first direction to form seven coupling zeros of the band elimination filter, and one side of each resonator, which is close to the transmission line, is provided with an opening; and the seven connecting sheets are arranged in one-to-one correspondence to the openings, one ends of the connecting sheets are coupled with the resonators, and the other ends of the connecting sheets are connected with the transmission lines. In this way, the band-stop filter in the embodiment of the application realizes seven coupling zeros through seven resonators, and can well control the band bandwidth of the band-stop filter, so that the out-of-band rejection performance of the band-stop filter can be improved.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A band reject filter, the band reject filter comprising:
transmission lines arranged in a first direction;
the seven resonators are sequentially coupled with the transmission line along a first direction to form seven coupling zeros of the band elimination filter, and one side, close to the transmission line, of each resonator is provided with an opening;
seven connecting sheets which are arranged corresponding to the openings one by one, wherein one end of each connecting sheet is coupled with the resonator, and the other end of each connecting sheet is connected with the transmission line.
2. The band-stop filter of claim 1, wherein the seven resonators are divided into two columns arranged along a second direction, and the two columns of resonators are respectively located on both sides of the transmission line, wherein the second direction is perpendicular to the first direction;
a first resonator, a third resonator, a fifth resonator and a seventh resonator of the seven resonators are arranged in a row in sequence along the first direction;
a second resonator, a fourth resonator and a sixth resonator of the seven resonators are arranged in a row in sequence along the first direction;
the projection of the center of the second resonator in the first direction is located between the projection of the center of the first resonator and the projection of the center of the third resonator in the first direction.
3. The band-stop filter of claim 1, wherein the resonators comprise:
a resonant cavity;
the resonance rod is arranged in the resonance cavity and comprises a U-shaped side wall and a hollow inner cavity formed by the U-shaped side wall;
and one end of the tuning rod is arranged in the hollow inner cavity.
4. The band-stop filter of claim 3, wherein both ends of the U-shaped sidewall extend in a bending manner away from the hollow cavity to form a disk-shaped structure at both ends of the U-shaped sidewall.
5. The band-stop filter of claim 3, further comprising seven adjusting rods, wherein the seven adjusting rods are arranged in one-to-one correspondence with the seven resonators, one ends of the adjusting rods extend into the resonant cavity, and the distance between the adjusting rods and the connecting sheets is smaller than a preset distance.
6. The band-stop filter of claim 5, further comprising a cover plate covering the seven resonators, wherein the cover plate is provided with a plurality of mounting holes, and the other ends of the tuning rod and the adjusting rod are fixed on the cover plate through the mounting holes.
7. The band stop filter of claim 3, wherein the resonant cavities are arranged in a square column.
8. The band-stop filter of claim 1, further comprising:
the input port is connected with the input end of the transmission line;
and the output port is connected with the output end of the transmission line.
9. The band-stop filter according to claim 1, characterized in that the band-stop filter has a band 703-915 MHz, 930-960 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 the band stop filter according to any of claims 1-9 for filtering radio frequency signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010271321.0A CN113497318A (en) | 2020-04-08 | 2020-04-08 | Band elimination filter and communication equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010271321.0A CN113497318A (en) | 2020-04-08 | 2020-04-08 | Band elimination filter and communication equipment |
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| CN113497318A true CN113497318A (en) | 2021-10-12 |
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| CN202010271321.0A Pending CN113497318A (en) | 2020-04-08 | 2020-04-08 | Band elimination filter and communication equipment |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104871363A (en) * | 2012-12-24 | 2015-08-26 | 上海贝尔股份有限公司 | An adjustable coupling for use with an input resonator and/or an output resonator of a bandpass filter |
| CN204793134U (en) * | 2015-07-30 | 2015-11-18 | 深圳市迈特通信设备有限公司 | A resonance pole for cavity filter |
| CN106816675A (en) * | 2017-03-10 | 2017-06-09 | 京信通信***（中国）有限公司 | Cavity type bandstop filter and radio-frequency devices |
| CN207624886U (en) * | 2017-12-26 | 2018-07-17 | 深圳市大富科技股份有限公司 | Adjustable tap coupling device, cavity body filter and communication equipment |
| CN207624877U (en) * | 2017-12-04 | 2018-07-17 | 深圳市大富科技股份有限公司 | A kind of bandstop filter and communication equipment |
-
2020
- 2020-04-08 CN CN202010271321.0A patent/CN113497318A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104871363A (en) * | 2012-12-24 | 2015-08-26 | 上海贝尔股份有限公司 | An adjustable coupling for use with an input resonator and/or an output resonator of a bandpass filter |
| CN204793134U (en) * | 2015-07-30 | 2015-11-18 | 深圳市迈特通信设备有限公司 | A resonance pole for cavity filter |
| CN106816675A (en) * | 2017-03-10 | 2017-06-09 | 京信通信***（中国）有限公司 | Cavity type bandstop filter and radio-frequency devices |
| CN207624877U (en) * | 2017-12-04 | 2018-07-17 | 深圳市大富科技股份有限公司 | A kind of bandstop filter and communication equipment |
| CN207624886U (en) * | 2017-12-26 | 2018-07-17 | 深圳市大富科技股份有限公司 | Adjustable tap coupling device, cavity body filter and communication equipment |
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Application publication date: 20211012 |
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