CN113675558A - Filter and communication equipment - Google Patents
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- CN113675558A CN113675558A CN202010409097.7A CN202010409097A CN113675558A CN 113675558 A CN113675558 A CN 113675558A CN 202010409097 A CN202010409097 A CN 202010409097A CN 113675558 A CN113675558 A CN 113675558A
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- 238000004891 communication Methods 0.000 title claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 242
- 238000006880 cross-coupling reaction Methods 0.000 claims abstract description 31
- 230000001939 inductive effect Effects 0.000 claims abstract description 15
- 230000008878 coupling Effects 0.000 claims description 35
- 238000010168 coupling process Methods 0.000 claims description 35
- 238000005859 coupling reaction Methods 0.000 claims description 35
- 239000002184 metal Substances 0.000 claims description 8
- 239000000523 sample Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract description 13
- 238000010586 diagram Methods 0.000 description 12
- 230000001629 suppression Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
- ORQBXQOJMQIAOY-UHFFFAOYSA-N nobelium Chemical compound [No] ORQBXQOJMQIAOY-UHFFFAOYSA-N 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 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
- H01P1/208—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 eleven filtering cavities which are sequentially coupled; a capacitive cross coupling element is arranged between the second filtering cavity and the fourth filtering cavity of the filtering branch circuit to form a capacitive cross coupling zero point of the filtering branch circuit; and inductive cross coupling elements are respectively arranged between the second filtering cavity and the fifth filtering cavity of the filtering branch circuit and between the seventh filtering cavity and the ninth filtering cavity of the filtering branch circuit so as to form two inductive cross coupling zeros of the filtering branch circuit. By the mode, the low end of the filter branch passband generates two transmission zero points, the high end generates one transmission zero point, and the strong rejection function of the stop band can be realized.
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 system, 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.
The inventor of the application finds that the setting of the transmission zero point is not reasonable in long-term research and development work, so that the characteristics of out-of-band suppression and the like of the filtering branch are poor, and the high isolation from the signals outside the channel is difficult to achieve.
Disclosure of Invention
The present application provides a filter and a communication device to solve the above technical problems.
In order to solve the technical problem, the application adopts a technical scheme that: there is provided a filter comprising: 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 eleven filtering cavities which are sequentially coupled; a capacitive cross coupling element is arranged between the second filtering cavity and the fourth filtering cavity of the filtering branch circuit to form a capacitive cross coupling zero point of the filtering branch circuit; and inductive cross coupling elements are respectively arranged between the second filtering cavity and the fifth filtering cavity of the filtering branch circuit and between the seventh filtering cavity and the ninth filtering cavity of the filtering branch circuit so as to form two inductive cross coupling zeros of the filtering branch circuit.
Further, eleven filter cavities of the filter branch circuit are divided into two rows arranged along the first direction; the first filtering cavity, the second filtering cavity, the fifth filtering cavity, the seventh filtering cavity, the ninth filtering cavity, the tenth filtering cavity and the eleventh filtering cavity of the filtering branch are in a row and are sequentially arranged along the second direction; the third filtering cavity, the fourth filtering cavity, the sixth filtering cavity and the eighth filtering cavity of the filtering branch are in a row and are sequentially arranged along the second direction.
Furthermore, a first filtering cavity, a second filtering cavity, a fifth filtering cavity, a seventh filtering cavity, a ninth filtering cavity, a tenth filtering cavity and an eleventh filtering cavity of the filtering branch are sequentially and adjacently arranged; a third filtering cavity, a fourth filtering cavity, a sixth filtering cavity and an eighth filtering cavity of the filtering branch are sequentially and adjacently arranged; the third filter cavity of the filter branch is respectively adjacent to the first filter cavity and the second filter cavity of the filter branch; the fourth filtering cavity of the filtering branch is respectively adjacent to the second filtering cavity and the fifth filtering cavity of the filtering branch; the sixth filtering cavity of the filtering branch is respectively adjacent to the fifth filtering cavity and the seventh filtering cavity of the filtering branch; and the eighth filtering cavity of the filtering branch is respectively adjacent to the seventh filtering cavity and the ninth filtering cavity of the filtering branch.
Furthermore, the capacitive cross coupling control element is a flying rod, the flying rod comprises a supporting clamping seat and a coupling probe, the coupling probe is fixed on the supporting clamping seat, and the supporting clamping seat is arranged on the bottom wall of the shell.
Furthermore, the inductive cross coupling element is a metal coupling rib, a first window is respectively arranged between the second filtering cavity and the fifth filtering cavity of the filtering branch circuit and between the seventh filtering cavity and the ninth filtering cavity of the filtering branch circuit, and the metal coupling rib is arranged at the first window.
Further, second windows are respectively arranged between the first filter cavity and the second filter cavity of the filter branch, between the second filter cavity and the third filter cavity of the filter branch, between the third filter cavity and the fourth filter cavity of the filter branch, between the fourth filter cavity and the fifth filter cavity of the filter branch, between the fifth filter cavity and the sixth filter cavity of the filter branch, between the sixth filter cavity and the seventh filter cavity of the filter branch, between the seventh filter cavity and the eighth filter cavity of the filter branch, between the eighth filter cavity and the ninth filter cavity of the filter branch, between the ninth filter cavity and the tenth filter cavity of the filter branch, and between the tenth filter cavity and the eleventh filter cavity of the filter branch, so that pure window coupling is realized.
Further, the filter includes an adjustment bar disposed at the first window and the second window for adjusting the coupling strength.
Furthermore, a resonator is arranged in the filter cavity and comprises a resonance rod and a tuning rod; the resonance rod comprises a side wall which is vertically arranged, a bottom wall which is horizontally arranged and a hollow inner cavity which is formed by connecting the side wall and the bottom wall; one end of the tuning rod is disposed within the hollow interior.
Furthermore, the bandwidth range of the filter is in the range of 3600MHz to 3800 MHz.
In order to solve the above technical problem, the present application further provides a communication device, where the communication device includes an antenna and a radio frequency unit, the antenna is connected to the radio frequency unit, the radio frequency unit includes a filter, and the filter is used for filtering a radio frequency signal.
The application has at least the following beneficial effects: on one hand, the cross coupling element is arranged, so that the low end of the passband of the filtering branch generates two transmission zero points, and the high end generates one transmission zero point, and the strong rejection function of the stop band can be realized. On the other hand, the filter cavities are regularly arranged in rows and adjacently, so that the cavity arrangement structure of the filter is compact, and the size of the filter can be reduced.
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 of a filter provided in the present application;
FIG. 3 is a schematic diagram of a flying rod structure of a filter provided herein;
fig. 4 is a schematic structural diagram of a resonator of a filter provided in the present application;
FIG. 5 is a schematic diagram of a simulation of a filter provided herein;
fig. 6 is a schematic diagram of an embodiment of a communication system apparatus 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.
Please refer to fig. 1, which is a schematic structural diagram of an embodiment of a filter 10 according to the present application.
As shown in fig. 1, the present embodiment provides a filter 10 including: a housing 101 having a first direction d1 and a second direction d2 perpendicular to the first direction d 1; and the filtering branch circuit is arranged on the shell 101 and consists of eleven filtering cavities which are coupled in sequence.
The housing 101 may include a bottom wall, a side wall, and an upper wall to form a closed space. In the present embodiment, the upper wall of the housing 101 is not shown in order to more clearly show the internal structure of the filter 10.
In particular, a capacitive cross-coupling element 102 is arranged between the second filter cavity a2 and the fourth filter cavity a4 of the filter branch, so as to form a capacitive cross-coupling zero point of the filter branch. Inductive cross coupling elements are respectively arranged between the second filtering cavity A2 and the fifth filtering cavity A5 of the filtering branch circuit and between the seventh filtering cavity A7 and the ninth filtering cavity A9 of the filtering branch circuit so as to form two inductive cross coupling zeros of the filtering branch circuit.
The coupling zero point is also called a transmission zero point, so that zero point suppression can be realized, and the debugging of indexes is facilitated. The transmission zero can make the transmission function of the filter 10 equal to zero, that is, the electromagnetic energy at the frequency point corresponding to the transmission zero can not pass through the network, thus playing a role of complete isolation, playing a role of inhibiting signals outside the pass band, and better realizing high isolation between the pass band and the outside.
More specifically, please refer to fig. 2, which is a schematic diagram of a topology structure of a filtering branch of the filter provided in the present application.
A capacitive cross-coupling element is arranged between the second filter cavity a2 and the fourth filter cavity a4 of the filter branch, and the electrical effect of the capacitive cross-coupling element is equivalent to a capacitor C1. Inductive cross coupling elements are respectively arranged between the second filtering cavity A2 and the fifth filtering cavity A5 of the filtering branch circuit and between the seventh filtering cavity A7 and the ninth filtering cavity A9 of the filtering branch circuit, and the electric effect of the inductive cross coupling elements is equivalent to that of capacitors L1 and L2.
More specifically, a transmission zero is created at the high end of the pass band of the filter 10 due to the capacitive cross-coupling element 102 formed between the second filter cavity a2 and the fourth filter cavity a4 of the filter branch. Since the inductive cross-coupling elements are respectively arranged between the second filter cavity a2 and the fifth filter cavity a5 of the filter branch and between the seventh filter cavity a7 and the ninth filter cavity a9 of the filter branch, two transmission zeros are generated at the high end of the pass band of the filter 10. The specific cross coupling elements are arranged between the specific filter cavities, so that two transmission zero points are generated at the high end, one transmission zero point is generated at the low end, the setting is reasonable, the strong rejection function of the stop band can be realized, and the strong out-of-band rejection performance can be achieved.
More specifically, as shown in fig. 1, eleven filter cavities of the filter branches are divided into two rows arranged along a first direction d 1; the first filtering cavity A1, the second filtering cavity A2, the fifth filtering cavity A5, the seventh filtering cavity A7, the ninth filtering cavity A9, the tenth filtering cavity A10 and the eleventh filtering cavity A11 of the filtering branch are in a row and are sequentially arranged along the second direction d 2; the third filtering cavity A3, the fourth filtering cavity A4, the sixth filtering cavity A6 and the eighth filtering cavity A8 of the filtering branch are in a row and are sequentially arranged along the second direction d 2.
The filter cavities of the filter branches are regularly arranged in a row, so that the arrangement among the filter cavities is relatively compact, and unnecessary arrangement space is reduced to reduce the overall size of the filter 10.
Specifically, a first filtering cavity A1, a second filtering cavity A2, a fifth filtering cavity A5, a seventh filtering cavity A7, a ninth filtering cavity A9, a tenth filtering cavity A10 and an eleventh filtering cavity A11 of the wave branch are sequentially and adjacently arranged; a third filtering cavity A3, a fourth filtering cavity A4, a sixth filtering cavity A6 and an eighth filtering cavity A8 of the filtering branch are sequentially and adjacently arranged; the third filtering cavity A3 of the filtering branch is respectively adjacent to the first filtering cavity A1 and the second filtering cavity A2 of the filtering branch; the fourth filtering cavity A4 of the filtering branch is respectively adjacent to the second filtering cavity A2 and the fifth filtering cavity A5 of the filtering branch; the sixth filtering cavity A6 of the filtering branch is respectively adjacent to the fifth filtering cavity A5 and the seventh filtering cavity A7 of the filtering branch; the eighth filtering cavity A8 of the filtering branch is respectively adjacent to the seventh filtering cavity a7 and the ninth filtering cavity a9 of the filtering branch.
The overall volume of the filter 10 is further reduced by the adjacent arrangement of the filter cavities to further reduce the spacing between the filter cavities.
Referring to fig. 3, fig. 3 is a schematic diagram of a flying rod structure of the filter 10 provided in the present application.
Specifically, the capacitive cross-coupling element 102 is a flying bar, the flying bar includes a supporting clamp seat 31 and a coupling probe 32, the coupling probe 32 is fixed on the supporting clamp seat, and the supporting clamp seat 31 is disposed on the bottom wall of the housing 101. Wherein, the support clamping seat 31 is made of PTFE or engineering plastics.
More specifically, the inductive cross-coupling element is a metal coupling rib, a first window 103 is respectively disposed between the second filter cavity a2 and the fifth filter cavity a5 of the filter branch, and between the seventh filter cavity a7 and the ninth filter cavity a9 of the filter branch, and the metal coupling rib is disposed at the first window 103.
Since the metal coupling rib is subjected to a small change in the external temperature, the temperature drift of the filter 10 can be prevented by implementing the inductive cross coupling through the metal coupling rib.
Specifically, as shown in fig. 1, a second window is respectively disposed between the first filter cavity a1 and the second filter cavity a2 of the filter branch, between the second filter cavity a2 and the third filter cavity A3 of the filter branch, between the third filter cavity A3 and the fourth filter cavity a4 of the filter branch, between the fourth filter cavity a4 and the fifth filter cavity A5 of the filter branch, between the fifth filter cavity A5 and the sixth filter cavity A6 of the filter branch, between the sixth filter cavity A6 and the seventh filter cavity a7 of the filter branch, between the seventh filter cavity a7 and the eighth filter cavity A8 of the filter branch, between the eighth filter cavity A8 and the ninth filter cavity a9 of the filter branch, between the ninth filter cavity a9 and the tenth filter cavity a10 of the filter branch, and between the tenth filter cavity a10 and the eleventh filter cavity a11 of the filter branch, and a window windows are respectively coupled between the tenth filter cavity a10 and the eleventh filter cavity a11 of the filter branch.
Specifically, the filter 10 includes an adjustment bar 104 disposed at the first window 103 and the second window 105 for adjusting the coupling strength between the two cavities.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a resonator 40 of the filter 10 provided in the present application.
Specifically, a resonator 40 is disposed in the filter cavity, and the resonator 40 includes a bottom wall 42, a side wall 41, an upper wall 43, and a resonant cavity formed by them. The resonator 40 further comprises a resonance rod and a tuning rod 47, wherein the resonance rod comprises a vertically arranged side wall 44, a horizontally arranged bottom wall 45 and a hollow inner cavity formed by connecting the side wall 44 with the bottom wall 45, and the bottom wall 45 of the resonance rod is fixed on the bottom wall 42 of the resonator 40 through a screw 46. The tuning rod 47 is vertically disposed on the upper wall 43 of the resonator 40, and one end of the tuning rod 47 is located above the upper wall 43 and the other end is located in the hollow cavity or in the resonant cavity directly above the hollow cavity.
Further, the resonant frequencies of the first filtering cavity a1, the second filtering cavity a2, the third filtering cavity A3, the fourth filtering cavity a4, the fifth filtering cavity a5, the sixth filtering cavity a6, the seventh filtering cavity a7, the eighth filtering cavity A8, the ninth filtering cavity a9, the tenth filtering cavity a10 and the eleventh filtering cavity a11 of the filtering branch are respectively: 3698.217705MHz, 3698.223645MHz, 3605.353888MHz, 3669.558122MHz, 3700.729812MHz, 3698.767577MHz, 3697.238024MHz, 3772.17588MHz, 3698.23643MHz, 3698.223645MHz and 3698.217706 MHz.
Further, the filter 10 also includes a first port coupled to the first filter cavity a1 of the filter branch and a second port coupled to the eleventh filter cavity a 11.
A coupling bandwidth between the first port and the first filter cavity a1 of the filter leg, a coupling bandwidth between the first filter cavity a1 and the second filter cavity a2 of the filter leg, a coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 of the filter leg, a coupling bandwidth between the second filter cavity a2 and the fourth filter cavity a4 of the filter leg, a coupling bandwidth between the second filter cavity a2 and the fifth filter cavity a5 of the filter leg, a coupling bandwidth between the third filter cavity A3 and the fourth filter cavity a4 of the filter leg, a coupling bandwidth between the fourth filter cavity a4 and the fifth filter cavity a5 of the filter leg, a coupling bandwidth between the fifth filter cavity a5 and the sixth filter cavity A6 of the filter leg, a coupling bandwidth between the sixth filter cavity A6 and the seventh filter cavity a7 of the filter leg, a coupling bandwidth between the seventh filter cavity a7 and the eighth filter cavity A8 of the filter leg, a4 and the eighth filter cavity A8 of the filter leg, The coupling bandwidth between the seventh filter cavity a7 and the ninth filter cavity a9 of the filter branch, the coupling bandwidth between the eighth filter cavity A8 and the ninth filter cavity a9 of the filter branch, the coupling bandwidth between the ninth filter cavity a9 and the tenth filter cavity a10 of the filter branch, the coupling bandwidth between the tenth filter cavity a10 and the eleventh filter cavity a11 of the filter branch, and the coupling bandwidth between the eleventh filter cavity a11 and the second port of the filter branch are respectively: 214.781MHz, 173.148MHz, 58.2097MHz, -99.3158MHz, 38.9034MHz, 34.0732MHz, 104.036MHz, 108.804MHz, 108.456MHz, 78.9301MHz, 75.8479MHz, 82.7673MHz, 121.513MHz, 173.148MHz, 214.781 MHz.
Thus, the bandwidth of the filter 10 can be in the range of 3600MHz to 3800 MHz. The working bandwidth range of the filter 10 is controlled to be 3600 MHz-3800 MHz, so that the design requirement is met, and the microwave filter can be applied to a 5G communication system for microwave filtering.
Please refer to fig. 5, which is a simulation diagram of the filter 10 provided in the present application.
As shown in fig. 5, the frequency band 51 is a simulation waveform of the filtering branch, and m1 to m5 are frequency points in the waveform. The working frequency band of the filtering branch is located between the frequency point m3 and the frequency point m4, specifically 3600-3800 MHz, and therefore the filter 10 provided by the application can be applied to a 5G communication system for microwave filtering.
Further, by combining the parameters of the frequency points m1 to m5 in the figure, the frequency at the frequency point m1 is 3.4GHz, and the suppression is 112 dB; the frequency at the frequency point m2 is 3.5GHz, and the suppression is 85 dB; the frequency at the frequency point m3 is 3.58GHz, and the suppression is 55 dB; the frequency at the frequency point m4 is 3.81GHz, and the suppression is 37 dB; at frequency point m5, the frequency is 3.99GHz, and the rejection is 101 dB. As can be further seen from fig. 5, the rejection of 20MHz outside the operating band of the filter 10 is greater than 50 dB.
The present application further provides a communication device 60, as shown in fig. 6, fig. 6 is a schematic diagram of an embodiment of the communication device 60 of the present application.
As shown in fig. 6, the communication device 60 of this embodiment includes an antenna 62 and a Radio frequency unit 61, where the antenna 62 is connected to the Radio frequency unit 61, and the Radio frequency unit 61 may be an rru (remote Radio unit). 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 (active Antenna unit).
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 eleven filtering cavities which are sequentially coupled;
a capacitive cross coupling element is arranged between the second filter cavity and the fourth filter cavity of the filter branch circuit to form a capacitive cross coupling zero point of the filter branch circuit; and inductive cross coupling elements are respectively arranged between the second filtering cavity and the fifth filtering cavity of the filtering branch circuit and between the seventh filtering cavity and the ninth filtering cavity of the filtering branch circuit so as to form two inductive cross coupling zeros of the filtering branch circuit.
2. The filter of claim 1,
eleven filter cavities of the filter branch circuit are divided into two rows arranged along the first direction;
the first filtering cavity, the second filtering cavity, the fifth filtering cavity, the seventh filtering cavity, the ninth filtering cavity, the tenth filtering cavity and the eleventh filtering cavity of the filtering branch are in a row and are sequentially arranged along the second direction;
and the third filtering cavity, the fourth filtering cavity, the sixth filtering cavity and the eighth filtering cavity of the filtering branch are in a row and are sequentially arranged along the second direction.
3. The filter of claim 2,
a first filtering cavity, a second filtering cavity, a fifth filtering cavity, a seventh filtering cavity, a ninth filtering cavity, a tenth filtering cavity and an eleventh filtering cavity of the filtering branch are sequentially and adjacently arranged;
a third filtering cavity, a fourth filtering cavity, a sixth filtering cavity and an eighth filtering cavity of the filtering branch are sequentially and adjacently arranged;
the third filter cavity of the filter branch is respectively adjacent to the first filter cavity and the second filter cavity of the filter branch;
the fourth filtering cavity of the filtering branch is respectively adjacent to the second filtering cavity and the fifth filtering cavity of the filtering branch;
the sixth filtering cavity of the filtering branch is respectively adjacent to the fifth filtering cavity and the seventh filtering cavity of the filtering branch;
and the eighth filtering cavity of the filtering branch is respectively adjacent to the seventh filtering cavity and the ninth filtering cavity of the filtering branch.
4. The filter of claim 1,
the capacitive cross-coupling control element is a flying rod, the flying rod comprises a supporting clamping seat and a coupling probe, the coupling probe is fixed on the supporting clamping seat, and the supporting clamping seat is arranged on the bottom wall of the shell.
5. The filter of claim 1,
the inductive cross coupling element is a metal coupling rib, first windows are respectively arranged between the second filtering cavity and the fifth filtering cavity of the filtering branch circuit and between the seventh filtering cavity and the ninth filtering cavity of the filtering branch circuit, and the metal coupling rib is arranged at the first window.
6. The filter of claim 1,
second windows are respectively arranged between a first filtering cavity and a second filtering cavity of the filtering branch, between the second filtering cavity and a third filtering cavity of the filtering branch, between the third filtering cavity and a fourth filtering cavity of the filtering branch, between the fourth filtering cavity and a fifth filtering cavity of the filtering branch, between the fifth filtering cavity and a sixth filtering cavity of the filtering branch, between the sixth filtering cavity and a seventh filtering cavity of the filtering branch, between the seventh filtering cavity and an eighth filtering cavity of the filtering branch, between the eighth filtering cavity and a ninth filtering cavity of the filtering branch, between the ninth filtering cavity and a tenth filtering cavity of the filtering branch, and between the tenth filtering cavity and an eleventh filtering cavity of the filtering branch, so that pure window coupling is realized.
7. The filter according to any one of claims 5 or 6,
the filter comprises an adjusting rod which is arranged at the first window or the second window and used for adjusting the coupling strength.
8. The filter of claim 1,
a resonator is arranged in the filter cavity and comprises a resonant rod and a tuning rod;
the resonance rod comprises a side wall which is vertically arranged, a bottom wall which is horizontally arranged and a hollow inner cavity which is formed by connecting the side wall and the bottom wall;
one end of the tuning rod is disposed within the hollow interior.
9. The filter of claim 1,
the bandwidth range of the filter is in 3600 MHz-3800 MHz.
10. A communication device, characterized in that the communication device comprises an antenna and a radio frequency unit, the antenna being connected to the radio frequency unit, the radio frequency unit comprising a filter according to any one of claims 1-9 for filtering radio frequency signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010409097.7A CN113675558A (en) | 2020-05-14 | 2020-05-14 | Filter and communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010409097.7A CN113675558A (en) | 2020-05-14 | 2020-05-14 | Filter and communication equipment |
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| Publication Number | Publication Date |
|---|---|
| CN113675558A true CN113675558A (en) | 2021-11-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010409097.7A Pending CN113675558A (en) | 2020-05-14 | 2020-05-14 | Filter and communication equipment |
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| CN (1) | CN113675558A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2881986Y (en) * | 2006-03-29 | 2007-03-21 | 摩比天线技术（深圳）有限公司 | Combined cross coupling 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 |
| CN209374645U (en) * | 2019-02-14 | 2019-09-10 | 深圳市大富科技股份有限公司 | Anti-interference filter 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 |
-
2020
- 2020-05-14 CN CN202010409097.7A patent/CN113675558A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2881986Y (en) * | 2006-03-29 | 2007-03-21 | 摩比天线技术（深圳）有限公司 | Combined cross coupling 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 |
| 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 |
| CN209374645U (en) * | 2019-02-14 | 2019-09-10 | 深圳市大富科技股份有限公司 | Anti-interference filter and communication equipment |
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Application publication date: 20211119 |
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