CN113629371A - Filter and communication equipment - Google Patents
Filter and communication equipment Download PDFInfo
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- CN113629371A CN113629371A CN202010389204.4A CN202010389204A CN113629371A CN 113629371 A CN113629371 A CN 113629371A CN 202010389204 A CN202010389204 A CN 202010389204A CN 113629371 A CN113629371 A CN 113629371A
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- 238000004891 communication Methods 0.000 title claims abstract description 19
- 238000001914 filtration Methods 0.000 claims abstract description 56
- 238000006880 cross-coupling reaction Methods 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 230000001629 suppression Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
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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 a filter and communication equipment. The filter includes: the filter comprises a cavity and a filter branch, wherein the filter branch is arranged in the cavity and consists of twelve low-pass pieces, a first low-pass piece to an eleventh low-pass piece of the filter branch are sequentially coupled, and a twelfth low-pass piece of the filter branch is arranged between a tenth low-pass piece of the filter branch and an output port of the filter to form a cross-coupling zero point; the working frequency band of the filtering branch is 300-960 MHz. Through this kind of mode, the filter volume of this application is less, and weight is lighter, and has stronger interference killing feature.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a filter and a communications device.
Background
The microwave filter is a key device of a modern mobile communication system and is widely applied to wireless communication base stations and various communication terminals; the microwave cavity filter structure is composed of a radio frequency connector, a cavity, a cover plate, a plurality of resonator units and a frequency tuning and coupling strength adjusting component, wherein the resonant frequencies of the plurality of resonator units are distributed in a passband range, and the microwave cavity filter structure has a blocking function on signals outside the resonant frequencies, so that the function of selecting microwave transmission signals is realized; the cavity filter has the advantages of reliable structure, wide filtering frequency band, parasitic pass band far away from a channel, high Q value, stable electrical property, good heat dissipation performance and the like.
The existing high-power filter of 300MHz-960MHz is difficult to realize due to lower frequency, longer resonance wavelength and wider bandwidth, and even if the high-power filter is realized, the size of the filter is huge, thus the requirement of miniaturization of 5G can not be met.
Disclosure of Invention
In order to solve the above problems of the prior art filter, the present application provides a communication device and a filter thereof.
In order to solve the technical problem, the application adopts a technical scheme that: there is provided a filter comprising: a cavity; the filter comprises a filter branch, a first filter, a second filter, a third filter and a fourth filter, wherein the filter branch is arranged in a cavity and consists of twelve low-pass pieces, a first low-pass piece to an eleventh low-pass piece of the filter branch are sequentially coupled, and a twelfth low-pass piece of the filter branch is arranged between a tenth low-pass piece of the filter branch and an output port of the filter to form a cross-coupling zero point; the working frequency band of the filtering branch is 300-960 MHz.
The twelfth low-pass sheet of the filtering branch is connected with the eleventh low-pass sheet of the filtering branch to form a cross-coupling zero point of the filtering branch. Zero point suppression is realized, and the out-of-band suppression performance of the filter is improved.
And the twelfth low-pass sheet of the filtering branch circuit is positioned between the tenth low-pass sheet and the eleventh low-pass sheet of the filtering branch circuit to form a cross-coupling zero point of the filtering branch circuit. Zero point suppression is realized, and the out-of-band suppression performance of the filter is improved.
The first low-pass filter, the third low-pass filter, the fifth low-pass filter, the seventh low-pass filter, the ninth low-pass filter and the eleventh low-pass filter of the filtering branch circuit are first impedance pieces; and a second low pass piece, a fourth low pass piece, a sixth low pass piece, an eighth low pass piece, a tenth low pass piece and a twelfth low pass piece of the filtering branch circuit are second impedance pieces. The first impedance sheet and the second impedance sheet are alternately arranged, so that the structure of the filter is simplified, and the filter meets the design requirement.
The first impedance sheet is arranged in a U shape, and the second impedance sheet is square. The cavity space is fully utilized, and the size of the filter is reduced.
The width of the first impedance piece along the extension direction of the filtering branch circuit is smaller than the width of the second impedance piece along the extension direction of the filtering branch circuit. The first impedance sheet is equivalent to an inductor, and the second impedance sheet is equivalent to a capacitor, so that the filter meets the design requirement.
The low pass sheet is a metal sheet, and the filtering branch circuit transmits electromagnetic signals through the metal sheet. The sheet metal saves the production cost while realizing the function of the filter.
Wherein, still be provided with the support cassette in the cavity, the low pass piece passes through the support cassette to be supported in the cavity. The support clamping seat supports the low-pass piece, and the stability of the filter cavity is improved.
The thickness range of the cavity in the direction perpendicular to the plane where the low-pass sheet is located is 2mm-6mm, and the width range of the cavity in the plane where the low-pass sheet is located is 18mm-22 mm. The filter has small volume and is beneficial to the miniaturization of the filter.
In order to solve the above technical problem, another technical solution adopted by the present application is: there is provided a communication device comprising an antenna and a radio frequency unit connected to the antenna, the radio frequency unit comprising a filter according to any of the above embodiments for filtering a radio frequency signal.
The beneficial effects of the embodiment of the application are that: be different from prior art, in this application, the filtering branch road sets up in the cavity, comprises twelve low logical pieces, and wherein, the first low logical piece to the eleventh low logical piece of filtering branch road couple in proper order, and the twelfth low logical piece of filtering branch road is located between the output port of tenth low logical piece and wave filter to form a cross coupling zero point, can realize the suppression of zero point, can effectively prevent that communication system from receiving stray signal interference. The working frequency band of the filtering branch circuit is 300-960MHz, the bandwidth of the filtering branch circuit can be accurately controlled, so that the filter meets the design requirement, and the filter is realized by the low-pass sheet, so that the flexibility of the filter design can be improved, the size of the filter is reduced, the weight of the filter is reduced, and the miniaturization of the filter is facilitated.
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 of the topology of the filter of FIG. 1;
FIG. 3 is a schematic diagram of an equivalent circuit configuration of the filter of FIG. 1;
FIG. 4 is a diagram of simulation results for the filter of FIG. 1;
fig. 5 is a schematic structural diagram of an embodiment of a communication device provided in 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.
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 this embodiment includes a cavity 11 and a filtering branch 12, and the filtering branch 12 is disposed in the cavity 11. The shape of the cavity may be a rectangular parallelepiped or a cylinder. Preferably, the cavity may be rectangular in shape to facilitate casting production.
As shown in fig. 1, the filtering branch 12 is composed of twelve low-pass plates, and the twelve low-pass plates of the filtering branch 12 are specifically a first low-pass plate a1, a second low-pass plate a2, a third low-pass plate A3, a fourth low-pass plate a4, a fifth low-pass plate a5, a sixth low-pass plate A6, a seventh low-pass plate a7, an eighth low-pass plate A8, a ninth low-pass plate a9, a tenth low-pass plate a10, an eleventh low-pass plate a11 and a twelfth low-pass plate a12 of the filtering branch 12.
The filter further comprises an input port (not shown) and an output port (not shown), the first low pass plate a1 of the filtering branch 12 is connected with the input port, and the eleventh low pass plate a11 of the filtering branch 12 is connected with the output port. Wherein the input port and the output port may be taps of the filter.
The first low pass piece a1 to the eleventh low pass piece a11 in the filtering branch 12 are coupled in sequence, and the twelfth low pass piece a12 of the filtering branch 12 is disposed between the tenth low pass piece a10 of the filtering branch 12 and the output port of the filter to form a cross-coupling zero point of the filtering branch 12, so that the filter meets the design requirement and can realize zero point suppression.
In a specific embodiment, as shown in fig. 1, the first low-pass plate a1 to the eleventh low-pass plate a11 of the filter branch 12 may be connected in sequence along the first direction L1, and the twelfth low-pass plate a12 may be connected to the eleventh low-pass plate a11 to form a cross-coupling zero of the filter branch 12. The first direction L1 may be a length direction of the cavity 11. The filtering branch 12 of the present embodiment is composed of twelve low-pass pieces a1-a12, and the twelve low-pass pieces of the filtering branch 12 are arranged regularly, so that the size of the filter can be reduced, the weight of the filter is reduced, the miniaturization of the filter is facilitated, and the requirement of a 5G communication system is met.
In another embodiment, the first low-pass pad a1 to the eleventh low-pass pad a11 of the filter branch 12 are sequentially connected along the first direction L1, and the twelfth low-pass pad a12 of the filter branch 12 may be disposed between the tenth low-pass pad a10 and the eleventh low-pass pad a11 to form a cross-coupling zero of the filter branch 12. The filter can meet the design requirements through the structural design, zero point suppression is achieved, the overall structure of the filter is simple, and production is facilitated.
Further, as shown in fig. 2, fig. 2 is a schematic diagram of a topology structure of the filter in fig. 1, a twelfth low-pass plate a12 of the filtering branch 12 may be located between the tenth low-pass plate a10 and the eleventh low-pass plate a11, so as to form a cross-coupling zero of the filtering branch 12, so that the filter generates a transmission zero at a high end of a pass band, thereby improving a rejection performance of the filter at a high-end stop band, enabling the filter to have a strong anti-interference capability, and ensuring that a communication system is not interfered by spurious signals.
The cross-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.
In this embodiment, the first low pass patch a1, the third low pass patch A3, the fifth low pass patch a5, the seventh low pass patch a7, the ninth low pass patch a9, and the eleventh low pass patch a11 of the filtering branch 12 may be first impedance patches; the second low pass patch a2, the fourth low pass patch a4, the sixth low pass patch a6, the eighth low pass patch A8, the tenth low pass patch a10 and the twelfth low pass patch a12 of the filtering branch 12 are second impedance patches. The first impedance sheet is narrow in width, and the second impedance sheet is wide in width. I.e. the width of the first impedance piece along the extension direction of the filter branch 12 is smaller than the width of the second impedance piece along the extension direction of the filter branch 12. The first impedance patch (the narrower impedance patch) may be equivalent to an inductor and the second impedance patch (the wider impedance patch) may be equivalent to a capacitor. That is, in this embodiment, the first low pass pad a1 to the eleventh low pass pad a11 of the filter branch 12 are sequentially connected, and the twelfth low pass pad a12 is connected to the eleventh low pass pad a11 to form a cross-coupling zero point, which can be regarded as that the first impedance pad and the second impedance pad are sequentially and alternately arranged, and can be equivalent to a plurality of LC filter circuits arranged in series, so that the filter meets the design requirement.
Further, as shown in fig. 1, in order to reasonably utilize the space of the cavity 11 and reduce the volume of the filter, the first impedance sheet may be U-shaped, and the second impedance sheet may be square. The size of each low pass filter can be selected according to actual power requirements. In this embodiment, the second impedance sheet is a wide sheet, which can be equivalent to a capacitor, and the two sides of the wide sheet are close to the ground, so that the impedance is easily reduced, and therefore, the second impedance sheet can be designed to be relatively small, and the structure of the double-sided matching impedance is beneficial to the miniaturization of the filter, so that the filter can meet the requirement of the miniaturization of a 5G mobile communication system.
Alternatively, the low pass sheet may be a metal sheet, and the low pass sheet may be formed by stamping the metal sheet, through which the filter may perform coupling transmission of the electromagnetic signal. In one embodiment, the low pass sheet may be copper. In other embodiments, the low pass sheet may be made of other conductive materials, or may be made of other non-sheet structures.
The filter 10 further comprises a support clamp (not shown) for supporting the low pass plate in the cavity 11. The support clamping seat may be an insulating screw, and preferably, the support clamping seat may be a teflon clamping seat to improve stability of the filter.
In this embodiment, the thickness of the cavity 11 in the direction perpendicular to the plane of the low pass sheet is in the range of 2mm to 6mm, preferably 4 mm. The width of the cavity 11 in the plane of the low pass sheet is in the range 18mm to 22mm, preferably 20 mm. In this embodiment, the filter has a small size, and can meet the requirements of a 5G mobile communication system.
The equivalent circuit of the filter of this embodiment is shown in fig. 3, and the circuit model includes low pass sheets a1-a12, the impedance at the first port is about 50 ohms, the impedance at the second port is about 50 ohms, the electromagnetic signal is transmitted along the coupling path, and the twelfth low pass sheet a12 is connected to the eleventh low pass sheet a11 to generate a cross-coupling zero of the filter branch 12.
As shown in fig. 4, fig. 4 is a schematic diagram of a simulation result of the filter in fig. 1, and a simulation bandwidth of the filtering branch 12 is shown as a frequency band curve 41 in fig. 4, and it can be seen from the simulation diagram that the bandwidth of the filtering branch 12 is within a range of 300-960MHz, which meets the design requirement of the filter and can accurately control the bandwidth of the filtering branch 12. The suppression is-33.78 dB at the frequency point m1 of 300MHz, is-31.81 dB at the frequency point m2 of 960MHz, and is-62.24 dB at the frequency point m3 of 1398 MHz. The filter of the embodiment has the advantages of small in-band loss (less than 0.2dB), low intermodulation residual value, strong anti-interference capability and large power capacity (the average power borne at normal temperature and normal pressure is more than 200W).
In summary, the filter of the present embodiment includes a cavity 11 and a filtering branch 12 located in the cavity 11, where the filtering branch 12 is composed of twelve low-pass pieces a1-a12, and forms a cross-coupling zero, so that zero suppression can be achieved, the filter has a strong suppression capability, and the interference of a communication system by stray signals can be effectively prevented. The working frequency band of the filtering branch 12 is 300-960MHz, so that the bandwidth of the filtering branch 12 can be accurately controlled, and the design requirement of the filter is met; the filter of this application is realized by the low pass piece, and the low pass piece rule of arranging, can improve the flexibility of filter structural design, reduces the volume of filter, alleviates the weight of filter, does benefit to the miniaturization of 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).
It should be noted that some embodiments of the present application refer to the present application as a filter, and may also be referred to as a combiner, that is, a dual-band combiner, and may also be referred to as a duplexer in other embodiments.
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 filter, characterized in that the filter comprises:
a cavity;
the filter branch circuit is arranged in the cavity and consists of twelve low-pass pieces, wherein a first low-pass piece to an eleventh low-pass piece of the filter branch circuit are sequentially coupled, and a twelfth low-pass piece of the filter branch circuit is arranged between a tenth low-pass piece of the filter branch circuit and an output port of the filter to form a cross coupling zero point of the filter branch circuit;
the working frequency band of the filtering branch is 300-960 MHz.
2. The filter according to claim 1, wherein the twelfth low-pass slice of a filtering branch is connected to the eleventh low-pass slice of the filtering branch to form a cross-coupling zero of the filtering branch.
3. The filter of claim 1, wherein the twelfth low-pass filter of the filtering branch is located between the tenth low-pass filter and the eleventh low-pass filter of the filtering branch to form a cross-coupling zero of the filtering branch.
4. The filter according to any one of claims 1 to 3, wherein the first low pass filter, the third low pass filter, the fifth low pass filter, the seventh low pass filter, the ninth low pass filter and the eleventh low pass filter of the filtering branch are first impedance pieces; and a second low pass piece, a fourth low pass piece, a sixth low pass piece, an eighth low pass piece, a tenth low pass piece and a twelfth low pass piece of the filtering branch circuit are second impedance pieces.
5. The filter of claim 4, wherein the first impedance patch is U-shaped and the second impedance patch is square.
6. The filter according to claim 4, wherein the width of the first impedance patch in the extension direction of the filter branch is smaller than the width of the second impedance patch in the extension direction of the filter branch.
7. The filter of claim 1, wherein the low-pass plate is a metal plate, and the filtering branch performs transmission of electromagnetic signals through the metal plate.
8. The filter of claim 1, wherein a support clamping seat is further disposed in the cavity, and the low-pass plate is supported in the cavity by the support clamping seat.
9. The filter of claim 1, wherein the cavity has a thickness in a direction perpendicular to a plane of the low pass sheet in a range of 2mm to 6mm, and a width in a plane of the low pass sheet in a range of 18mm to 22 mm.
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 |
|---|---|---|---|
| CN202010389204.4A CN113629371A (en) | 2020-05-09 | 2020-05-09 | Filter and communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010389204.4A CN113629371A (en) | 2020-05-09 | 2020-05-09 | Filter and communication equipment |
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| Publication Number | Publication Date |
|---|---|
| CN113629371A true CN113629371A (en) | 2021-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010389204.4A Pending CN113629371A (en) | 2020-05-09 | 2020-05-09 | Filter and communication equipment |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101719579A (en) * | 2009-12-30 | 2010-06-02 | 西安空间无线电技术研究所 | Multi-band bandstop filter and multi-band bandpass filter |
| CN202977666U (en) * | 2012-11-22 | 2013-06-05 | 成都九洲迪飞科技有限责任公司 | High selectivity step impedance line filter |
| CN204905390U (en) * | 2015-08-19 | 2015-12-23 | 成都九洲迪飞科技有限责任公司 | Miniaturized high -power microstrip low pass filter |
| CN107464969A (en) * | 2017-08-03 | 2017-12-12 | 重庆邮电大学 | A kind of controllable Microstrip Low-Pass of transmission zero |
| CN110212280A (en) * | 2019-05-25 | 2019-09-06 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | K frequency range gallium arsenide chips filter preparation method |
-
2020
- 2020-05-09 CN CN202010389204.4A patent/CN113629371A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101719579A (en) * | 2009-12-30 | 2010-06-02 | 西安空间无线电技术研究所 | Multi-band bandstop filter and multi-band bandpass filter |
| CN202977666U (en) * | 2012-11-22 | 2013-06-05 | 成都九洲迪飞科技有限责任公司 | High selectivity step impedance line filter |
| CN204905390U (en) * | 2015-08-19 | 2015-12-23 | 成都九洲迪飞科技有限责任公司 | Miniaturized high -power microstrip low pass filter |
| CN107464969A (en) * | 2017-08-03 | 2017-12-12 | 重庆邮电大学 | A kind of controllable Microstrip Low-Pass of transmission zero |
| CN110212280A (en) * | 2019-05-25 | 2019-09-06 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | K frequency range gallium arsenide chips filter preparation method |
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