CN113131898A - Filter and communication equipment - Google Patents
Filter and communication equipment Download PDFInfo
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- CN113131898A CN113131898A CN201911404831.4A CN201911404831A CN113131898A CN 113131898 A CN113131898 A CN 113131898A CN 201911404831 A CN201911404831 A CN 201911404831A CN 113131898 A CN113131898 A CN 113131898A
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- filtering
- filter
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- branch
- filtering cavity
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/48—Coupling means therefor
- H03H9/52—Electric coupling means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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; a first port disposed on the housing; the first filtering branch is connected with the first port and consists of four filtering cavities which are sequentially coupled; the second filtering branch is connected with the first port and consists of four filtering cavities which are sequentially coupled; wherein, the bandwidth range of the first filtering branch circuit is: 689-863MHz, the bandwidth range of the second filtering branch is: 879 and 961 MHz. By means of the mode, the number of the ports can be reduced, the space occupied by the ports is reduced, the size of the filter is reduced, and cost is reduced.
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 application finds that in long-term research and development work, the filter in the prior art is provided with at least a first filtering branch and a second filtering branch, each filtering branch is provided with an input port and an output port independently, the number of the ports is large, and the filter is large in size and high in cost.
Disclosure of Invention
The application provides a filter and communication equipment to solve the technical problem that the filter is large in size and high in cost 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;
a first port disposed on the housing;
the first filtering branch is connected with the first port and consists of four filtering cavities which are sequentially coupled;
the second filtering branch is connected with the first port and consists of four filtering cavities which are sequentially coupled;
wherein, the bandwidth range of the first filtering branch circuit is: 689-863MHz, the bandwidth range of the second filtering branch is: 879 and 961 MHz;
according to the filter, the first filtering branch and the second filtering branch are connected with the first port, namely the first filtering branch and the second filtering branch share the first port, so that the number of ports can be reduced, the space occupied by the ports is reduced, the size of the filter is reduced, and the cost is reduced; the bandwidth range of the first filtering branch is as follows: 689-863MHz, the bandwidth range of the second filtering branch is: 879-961MHz to meet the design requirement, the bandwidths of the first and second filtering branches can be accurately controlled, and the bandwidth isolation between the first and second filtering branches is high.
Optionally, four filter cavities of the first filter branch are linearly arranged;
the four filter cavities of the second filter branch circuit are linearly arranged;
the fourth filtering cavity of the first filtering branch and the fourth filtering cavity of the second filtering branch are connected with the first port; first filtering branch road and second filtering branch road all are sharp setting, the design and the debugging of the wave filter of being convenient for.
Optionally, the first filter cavity, the second filter cavity, the third filter cavity and the fourth filter cavity of the first filter branch are sequentially arranged along the second direction, and the four filter cavities of the first filter branch are arranged in a line, so that the utilization rate of the filter space is improved.
Optionally, the first filter cavity of the first filter branch is coupled with the second filter cavity through a window, the second filter cavity is coupled with the third filter cavity through a window, the third filter cavity is coupled with the fourth filter cavity through a window, and the fourth filter cavity is coupled with the first port through a window; the filter branches are all coupled by windows, so that the consistency of the first filter branch is good, other cross coupling elements are not needed, and the cost is reduced.
Optionally, the first filter cavity, the second filter cavity, the third filter cavity and the fourth filter cavity of the second filter branch are sequentially arranged along the second direction, and the four filter cavities of the second filter branch are arranged in a line, so that the utilization rate of the filter space is improved.
Optionally, the window coupling between the first filter cavity and the second filter cavity, the window coupling between the second filter cavity and the third filter cavity, the window coupling between the third filter cavity and the fourth filter cavity, and the window coupling between the fourth filter cavity and the first port of the second filter branch are all window couplings, so that the second filter branch has good consistency, no other cross-coupling element is needed, and the cost is reduced.
Optionally, the first filter cavity to the third filter cavity of the first filter branch and the first filter cavity to the third filter cavity of the second filter branch are symmetrically arranged, so that design and debugging of the filter are facilitated.
Optionally, the size of the first filter cavity of the first filter branch is smaller than the size of the second filter cavity, the size of the fourth filter cavity of the first filter branch is larger than the size of the second filter cavity, and the first filter branch uses filter cavities of various sizes, so that the design requirements can be met, and the size of the filter is reduced.
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.
Be different from prior art's condition, the first filtering branch road and the second filtering branch road of this application all are connected with first port, and first filtering branch road and second filtering branch road share first port promptly can reduce the quantity of port, reduce the shared space of port, reduce the volume of wave filter, reduce cost.
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 topology diagram of a first filtering branch and a second 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 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 10, a first port 11, a first filter branch 12 and a second filter branch 13, the housing 10 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 10, and the second direction L2 may be a width direction of the housing 10.
As shown in fig. 1, the first filtering branch 12 is composed of four filtering cavities coupled in sequence, and the four filtering cavities of the first filtering branch 12 are a first filtering cavity a1, a second filtering cavity a2, a third filtering cavity A3 and a fourth filtering cavity a 4. The second filtering branch 13 and the first filtering branch 12 are sequentially arranged along the first direction L1 and are composed of four filtering cavities coupled in sequence, and the four filtering cavities of the second filtering branch 13 are a first filtering cavity B1, a second filtering cavity B2, a third filtering cavity B3 and a fourth filtering cavity B4. The four filter cavities of the first filter branch 12 are linearly arranged, and the four filter cavities of the second filter branch 13 are linearly arranged; the first filtering branch 12 and the second filtering branch 13 are both arranged linearly, so that the design and debugging of the filter are facilitated. The fourth filtering cavity a4 of the first filtering branch 12 and the fourth filtering cavity B4 of the second filtering branch 13 are connected with the first port 11; the first filtering cavity A1, the second filtering cavity A2, the third filtering cavity A3 and the fourth filtering cavity A4 of the first filtering branch 12 are sequentially arranged along the second direction L2, and the four filtering cavities of the first filtering branch 12 are arranged in a line, so that the utilization rate of a filter space is improved; the first filtering cavity B1, the second filtering cavity B2, the third filtering cavity B3 and the fourth filtering cavity B4 of the second filtering branch 13 are sequentially arranged along the second direction L2, and the four filtering cavities of the second filtering branch 13 are arranged in a line, so that the utilization rate of the space of the filter is improved.
The first filtering cavity a1 to the third filtering cavity A3 of the first filtering branch 12 and the first filtering cavity B1 to the third filtering cavity B3 of the second filtering branch 13 are symmetrically arranged, so that the design and debugging of the filter are facilitated. The size of the first filtering cavity A1 of the first filtering branch 12 is smaller than that of the second filtering cavity A2, the size of the fourth filtering cavity A4 of the first filtering branch 12 is larger than that of the second filtering cavity A2, the first filtering branch 12 uses filtering cavities with various sizes, the design requirements can be met, and the size of the filter is reduced. In addition, the size of the first filtering cavity B1 of the second filtering branch 13 is smaller than the size of the second filtering cavity B2, the size of the fourth filtering cavity B4 of the second filtering branch 13 is larger than the size of the second filtering cavity B2 and smaller than the size of the fourth filtering cavity a4 of the first filtering branch 12, and the second filtering branch 13 also uses filtering cavities with various sizes, so that the design requirements can be met.
As shown in fig. 1 and 2, fig. 2 is a schematic diagram of a topology structure of a first filtering branch and a second filtering branch provided in the present application. The first filtering cavity a1 and the second filtering cavity a2 of the first filtering branch 12 are coupled through a window, the second filtering cavity a2 and the third filtering cavity A3 are coupled through a window, the third filtering cavity A3 and the fourth filtering cavity a4 are coupled through a window, and the fourth filtering cavity a4 and the first port 11 are coupled through a window; the first filtering branch 12 is window-coupled, so that the consistency of the first filtering branch is good, other cross-coupling elements are not needed, and the cost is reduced. The window coupling between the first filtering cavity B1 and the second filtering cavity B2, the window coupling between the second filtering cavity B2 and the third filtering cavity B3, the window coupling between the third filtering cavity B3 and the fourth filtering cavity B4, and the window coupling between the fourth filtering cavity B4 and the first port 11 of the second filtering branch 13 are all window couplings, so that the consistency of the second filtering branch 13 is good, other cross-coupling elements are not needed, and the cost is reduced; therefore, the filter has good consistency and reduces the cost.
Taking the window coupling between the first filter cavity a1 and the second filter cavity a2 of the first filter branch 12 as an example, the first filter cavity a1 and the second filter cavity a2 may be disposed at intervals, a first window (not shown) may be disposed on a side wall (not shown) of the first filter cavity a1 close to the second filter cavity a2, and a second window (not shown) corresponding to the first window is disposed on a side wall (not shown) of the second filter cavity a2 close to the first filter cavity a1, so as to implement the window coupling between the first filter cavity a1 and the second filter cavity a 2.
The housing 10 of the present embodiment is further provided with a first input end (not shown), a second input end (not shown) and an output end (not shown), the first filter cavity a1 of the first filter branch 12 is coupled with the first input end, the first filter cavity B1 of the second filter branch 13 is coupled with the second input end, the first port 11 is coupled with the output end, and the first input end, the second input end and the output end may be taps of a filter.
In the first filtering branch 12, the coupling bandwidth between the output terminal and the first port 11 ranges from 646-; the coupling bandwidth between the first port 11 and the fourth filter cavity A4 is in the range of 291-328 MHz; the coupling bandwidth between the fourth filter cavity A4 and the third filter cavity A3 is in the range of 122-141 MHz; the coupling bandwidth between the third filter cavity A3 and the second filter cavity A2 is in the range of 112 and 129 MHz; the coupling bandwidth between the second filter cavity A2 and the first filter cavity A1 is in the range of 157 MHz and 179 MHz; the coupling bandwidth between the first filter cavity a1 and the first input is in the range of 200 and 227 MHz.
The resonant frequencies of the first port 11, the fourth filter cavity a4 of the first filter branch 12 and the first filter cavity a1 are sequentially in the following ranges: 812-, 814MHz, 757-, 759MHz, 763-, 765MHz, 767-, 769MHz, and 768-, 770 MHz. Therefore, the bandwidth of the first filtering branch 12 of this embodiment is within the range of 689-863MHz, and the bandwidth of the first filtering branch 12 can be accurately controlled, so as to meet the design requirement of the filter.
As shown in fig. 3, fig. 3 is a schematic diagram of simulation results of the filter provided in the present application. The simulated bandwidth of the first filtering branch 12 in this embodiment is as shown in the frequency band curve 31 in fig. 3, and it can be obtained that the simulated bandwidth of the first filtering branch 12 is within the range of 689-863MHz, which meets the design requirement of the filter and can accurately control the bandwidth of the first filtering branch 12. When the frequency range of the first filtering branch 12 is 879.5-961MHz, the suppression is greater than or equal to 48 dB; the out-of-band rejection etc. of the first filtering branch 12 can thus be improved.
In the second filtering branch 13, the coupling bandwidth between the first port 11 and the fourth filtering cavity B4 is in the range of 196-223 MHz; the coupling bandwidth between the fourth filter cavity B4 and the third filter cavity B3 ranges from 48-59 MHz; the coupling bandwidth between the third filter cavity B3 and the second filter cavity B2 is in the range of 43-52 MHz; the coupling bandwidth between the second filter cavity B2 and the first filter cavity B1 is in the range of 61-73 MHz; the coupling bandwidth between the first filter cavity B1 and the second input is in the range of 79-92 MHz.
The resonant frequencies of the fourth filter cavity B4 of the second filter branch 13 to the first filter cavity B1 are sequentially in the following ranges: 936-938MHz, 924-926MHz, 920-922MHz and 919-921 MHz. Therefore, the bandwidth of the second filtering branch 13 of the present embodiment is located in the range of 879-961MHz, and the bandwidth of the second filtering branch 13 can be accurately controlled, so as to meet the design requirement of the filter.
As shown in fig. 3, the simulated bandwidth of the second filtering branch 13 in this embodiment is as the frequency band curve 32 in fig. 3, so that the simulated bandwidth of the second filtering branch 13 is within the range of 879-961MHz, which meets the design requirement of the filter, and the bandwidth of the second filtering branch 13 can be precisely controlled. When the frequency range of the second filtering branch circuit 13 is 689-862.5MHz, the suppression is greater than or equal to 48 dB; the out-of-band rejection etc. of the second filter branch 13 can thus be improved.
The first filtering branch 12 and the second filtering branch 13 of the present application may be a transmitting filtering branch or a receiving filtering branch.
The present application further provides a communication device, as shown in fig. 4, fig. 4 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 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 (9)
1. A filter, characterized in that the filter comprises:
a housing having a first direction and a second direction perpendicular to the first direction;
a first port disposed on the housing;
the first filtering branch is connected with the first port and consists of four filtering cavities which are sequentially coupled;
the second filtering branch is connected with the first port and consists of four filtering cavities which are sequentially coupled;
wherein, the bandwidth range of the first filtering branch circuit is: 689-863MHz, the bandwidth range of the second filtering branch is: 879 and 961 MHz.
2. The filter of claim 1,
the four filter cavities of the first filter branch are linearly arranged;
the four filter cavities of the second filter branch circuit are linearly arranged;
and the fourth filtering cavity of the first filtering branch and the fourth filtering cavity of the second filtering branch are connected with the first port.
3. The filter of claim 2,
and the first filtering cavity, the second filtering cavity, the third filtering cavity and the fourth filtering cavity of the first filtering branch are sequentially arranged along the second direction.
4. The filter of claim 3,
and the first filtering cavity of the first filtering branch circuit is coupled with the second filtering cavity through a window, the second filtering cavity is coupled with the third filtering cavity through a window, the third filtering cavity is coupled with the fourth filtering cavity through a window, and the fourth filtering cavity is coupled with the first port through a window.
5. The filter according to any of claims 1-4,
and the first filtering cavity, the second filtering cavity, the third filtering cavity and the fourth filtering cavity of the second filtering branch are sequentially arranged along the second direction.
6. The filter of claim 5,
and the first filtering cavity and the second filtering cavity of the second filtering branch circuit are in window coupling, the second filtering cavity and the third filtering cavity are in window coupling, the third filtering cavity and the fourth filtering cavity are in window coupling, and the fourth filtering cavity and the first port are in window coupling.
7. The filter of claim 5,
the first filtering cavity to the third filtering cavity of the first filtering branch circuit and the first filtering cavity to the third filtering cavity of the second filtering branch circuit are symmetrically arranged.
8. The filter of claim 7, wherein the first filter cavity size of the first filter branch is smaller than the second filter cavity size, and wherein the fourth filter cavity size of the first filter branch is larger than the second filter cavity size.
9. 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 1-8 for filtering radio frequency signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911404831.4A CN113131898A (en) | 2019-12-30 | 2019-12-30 | Filter and communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911404831.4A CN113131898A (en) | 2019-12-30 | 2019-12-30 | Filter and communication equipment |
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| Publication Number | Publication Date |
|---|---|
| CN113131898A true CN113131898A (en) | 2021-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911404831.4A Pending CN113131898A (en) | 2019-12-30 | 2019-12-30 | Filter and communication equipment |
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| CN (1) | CN113131898A (en) |
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| US20090058563A1 (en) * | 2007-08-28 | 2009-03-05 | Ace Technology | Frequency Tunable Filter |
| 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 |
| CN102683773A (en) * | 2012-04-28 | 2012-09-19 | 华为技术有限公司 | Adjustable filter and duplexer comprising same |
| CN202977665U (en) * | 2012-12-12 | 2013-06-05 | 深圳市大富科技股份有限公司 | Cavity filter and communication radiofrequency device |
| CN106025465A (en) * | 2016-06-07 | 2016-10-12 | 中国电子科技集团公司第三十六研究所 | Cavity filter |
| CN108475836A (en) * | 2015-12-24 | 2018-08-31 | 华为技术有限公司 | A kind of filter and Wireless Communication Equipment |
| WO2019213916A1 (en) * | 2018-05-10 | 2019-11-14 | 深圳市大富科技股份有限公司 | Cavity filter and communication radio frequency device |
| CN209766611U (en) * | 2018-12-29 | 2019-12-10 | 四川天邑康和通信股份有限公司 | Miniature cavity filter for digital optical fiber repeater |
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2019
- 2019-12-30 CN CN201911404831.4A patent/CN113131898A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090058563A1 (en) * | 2007-08-28 | 2009-03-05 | Ace Technology | Frequency Tunable Filter |
| 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 |
| CN102683773A (en) * | 2012-04-28 | 2012-09-19 | 华为技术有限公司 | Adjustable filter and duplexer comprising same |
| CN202977665U (en) * | 2012-12-12 | 2013-06-05 | 深圳市大富科技股份有限公司 | Cavity filter and communication radiofrequency device |
| CN108475836A (en) * | 2015-12-24 | 2018-08-31 | 华为技术有限公司 | A kind of filter and Wireless Communication Equipment |
| CN106025465A (en) * | 2016-06-07 | 2016-10-12 | 中国电子科技集团公司第三十六研究所 | Cavity filter |
| WO2019213916A1 (en) * | 2018-05-10 | 2019-11-14 | 深圳市大富科技股份有限公司 | Cavity filter and communication radio frequency device |
| CN209766611U (en) * | 2018-12-29 | 2019-12-10 | 四川天邑康和通信股份有限公司 | Miniature cavity filter for digital optical fiber repeater |
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