CN113540718A - Filter and communication equipment - Google Patents

Filter and communication equipment Download PDF

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Publication number
CN113540718A
CN113540718A CN202010292039.0A CN202010292039A CN113540718A CN 113540718 A CN113540718 A CN 113540718A CN 202010292039 A CN202010292039 A CN 202010292039A CN 113540718 A CN113540718 A CN 113540718A
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CN
China
Prior art keywords
filter
filtering
cavity
branch
cavities
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Pending
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CN202010292039.0A
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Chinese (zh)
Inventor
张宝真
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Shenzhen Tatfook Technology Co Ltd
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Shenzhen Tatfook Technology Co Ltd
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Application filed by Shenzhen Tatfook Technology Co Ltd filed Critical Shenzhen Tatfook Technology Co Ltd
Priority to CN202010292039.0A priority Critical patent/CN113540718A/en
Publication of CN113540718A publication Critical patent/CN113540718A/en
Pending legal-status Critical Current

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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM

Abstract

The application discloses a filter and communication equipment. The filter includes: a housing; the filtering branch is arranged on the shell and consists of eight filtering cavities which are sequentially coupled, inductive cross coupling is respectively performed between a first filtering cavity and a fourth filtering cavity, between a fifth filtering cavity and an eighth filtering cavity and between a sixth filtering cavity and the eighth filtering cavity of the filtering branch, and capacitive cross coupling is performed between the first filtering cavity and the third filtering cavity of the filtering branch so as to form four cross coupling zeros of the filtering branch; wherein the bandwidth of the filter is 1860MHz-1875 MHz. In this way, the stop-band rejection performance of the filter can be improved.

Description

Filter and communication equipment
Technical Field
The present application relates to the field of communications technologies, and in particular, to a filter and a communications device.
Background
The cavity 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 cavity filter 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 the passband range, and the cavity filter 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 inventor of the application finds that the arrangement of a plurality of filter cavities in the existing cavity filter is complex and irregular, the size of the filter is increased, and the stop band inhibition performance of the cavity filter is poor.
Disclosure of Invention
The application provides a filter and communication equipment, so as to improve stop band suppression performance of the filter.
In order to solve the technical problem, the application adopts a technical scheme that: there is provided a filter comprising: a housing; the filtering branch is arranged on the shell and consists of eight filtering cavities which are sequentially coupled, inductive cross coupling is respectively performed between a first filtering cavity and a fourth filtering cavity, between a fifth filtering cavity and an eighth filtering cavity and between a sixth filtering cavity and the eighth filtering cavity of the filtering branch, and capacitive cross coupling is performed between the first filtering cavity and the third filtering cavity of the filtering branch so as to form four cross coupling zeros of the filtering branch; wherein the bandwidth of the filter is 1860MHz-1875 MHz.
Optionally, first windows are respectively arranged between the first filter cavity and the fourth filter cavity, between the fifth filter cavity and the eighth filter cavity, and between the sixth filter cavity and the eighth filter cavity of the filter branch; and a capacitive coupling component is arranged between the first filtering cavity and the third filtering cavity of the filtering branch circuit.
Optionally, the capacitive coupling assembly includes a support socket and a coupling probe, the coupling probe is fixed on the support socket, and the support socket is disposed in a window between the first filter cavity and the third filter cavity of the filter branch. Capacitive cross coupling may be achieved by capacitive coupling elements.
Optionally, eight filter cavities of the filter branch are sequentially window-coupled, and a second window is disposed between two filter cavities of the filter branch that are sequentially coupled. And pure window coupling is adopted between two adjacent filter cavities on the filter branch coupling path, so that the cost of the filter is reduced.
Optionally, the first window and the second window are both provided with a first tuning rod for adjusting the coupling strength.
Optionally, the eight filter cavities of the filter branch are divided into three rows arranged along the second direction, and the second direction and the first direction are arranged perpendicular to each other; the fourth filtering cavity, the fifth filtering cavity and the eighth filtering cavity of the filtering branch are in a row and are sequentially arranged along the first direction; the first filtering cavity, the third filtering cavity, the sixth filtering cavity and the seventh filtering cavity of the filtering branch are in a row and are sequentially arranged along the first direction; the second filtering cavities of the filtering branches are sequentially arranged in a row along the first direction, and the second filtering cavities, the third filtering cavities and the fifth filtering cavities are arranged in a straight line. The eight filter cavities are divided into three rows which are sequentially arranged along the second direction, the eight filter cavities are regularly arranged, and the size of the filter branch is reduced, so that the size of the filter is reduced.
Optionally, each of the filter cavities is provided with: the resonance rod comprises a U-shaped side wall and a hollow inner cavity formed by the U-shaped side wall; a second tuning rod, one end of the second tuning rod being disposed within the hollow interior; the shell is also provided with a mounting column, and the U-shaped side wall is fixed on the mounting column; the two ends of the U-shaped side wall bend and extend in the direction away from the hollow inner cavity, so that disc-shaped structures are formed at the two ends of the U-shaped side wall, and the disc-shaped structures are arranged in parallel with the bottom of the U-shaped side wall. The disc-shaped structures at the two ends of the U-shaped side wall can increase the signal coupling amount of the resonance rod.
Optionally, the housing is further provided with a mounting post, and the U-shaped side wall is fixed to the mounting post. The resonant rod may be secured to the housing by a mounting post and the resonant frequency of the resonant cavity may be adjusted by adjusting the depth of the tuning rod within the hollow cavity.
The filter further comprises: the first port is connected with the first filtering cavity of the filtering branch circuit; and the second port is connected with the eighth filtering cavity of the filtering branch circuit.
In order to solve the above technical problem, the present application adopts another technical solution: a communication device is provided. The communication equipment comprises an antenna and a radio frequency unit connected with the antenna, wherein the radio frequency unit comprises the filter and is used for filtering radio frequency signals.
The beneficial effect of this application is: different from the prior art, the filter of the embodiment of the application comprises: a housing having a first direction and a second direction which are arranged perpendicular to each other; the filtering branch is arranged on the shell and consists of eight filtering cavities which are sequentially coupled, inductive cross coupling is respectively performed between a first filtering cavity and a fourth filtering cavity, between a fifth filtering cavity and an eighth filtering cavity and between a sixth filtering cavity and the eighth filtering cavity of the filtering branch, and capacitive cross coupling is performed between the first filtering cavity and the third filtering cavity of the filtering branch so as to form four cross coupling zeros of the filtering branch; wherein the bandwidth of the filter is 1860MHz-1875 MHz. In the embodiment of the application, the first filtering cavity and the fourth filtering cavity of the filtering branch, the fifth filtering cavity and the eighth filtering cavity, and the sixth filtering cavity and the eighth filtering cavity of the filtering branch are respectively coupled in an inductive cross manner, so that the high-end rejection of the bandwidth of the filtering branch can be well controlled, and a better high-end rejection of the bandwidth can be obtained; in addition, the bandwidth of the filtering branch circuit ranges from 1860MHz to 1875MHz, and the bandwidth of the filtering branch circuit can be accurately controlled.
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 according to the present application;
FIG. 2 is a schematic diagram of the topology of the filter of the embodiment of FIG. 1;
FIG. 3 is a schematic diagram of the capacitive coupling element of the filter of FIG. 1;
FIG. 4 is a schematic structural diagram of a second tuning rod, resonant rod and mounting post combination structure of the filter cavity of the embodiment of FIG. 1;
FIG. 5 is a schematic diagram of an equivalent circuit configuration of the filter of the embodiment of FIG. 1;
FIG. 6 is a diagram illustrating a simulated structure of the filter of the embodiment of FIG. 1;
fig. 7 is a schematic structural diagram of an embodiment of the communication device of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first" and "second" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
First, a filter is provided, please refer to fig. 1 and fig. 2, in which fig. 1 is a schematic structural diagram of a first embodiment of the filter of the present application, and fig. 2 is a schematic topological structural diagram of the filter of fig. 1. The filter 10 of the present embodiment includes: a housing 11 and eight filter chambers; the filtering branch 12 is arranged on the shell 11 and consists of eight filtering cavities which are coupled in sequence.
Specifically, the eight filter cavities of the filter branch 12 include: a first filter cavity A1, a second filter cavity A2, a third filter cavity A3, a fourth filter cavity A4, a fifth filter cavity A5, a sixth filter cavity A6, a seventh filter cavity A7 and an eighth filter cavity A8; inductive cross coupling is respectively performed between the first filtering cavity A1 and the fourth filtering cavity A4, between the fifth filtering cavity A5 and the eighth filtering cavity A8 and between the sixth filtering cavity A6 and the eighth filtering cavity A8 of the filtering branch 12, and capacitive cross coupling is performed between the first filtering cavity A1 and the third filtering cavity A3 of the filtering branch 12; wherein the bandwidth of the filter 10 is 1860MHz-1875 MHz.
It can be seen that, inductive cross coupling is respectively performed between the first filter cavity a1 and the fourth filter cavity a4, between the fifth filter cavity a5 and the eighth filter cavity A8, and between the sixth filter cavity a6 and the eighth filter cavity A8 of the filter branch 12, so that high-end rejection of the bandwidth of the filter branch 12 can be well controlled, and good high-end rejection of the bandwidth is obtained, and capacitive cross coupling is performed between the first filter cavity a1 and the third filter cavity A3 of the filter branch 12, so that a capacitive coupling zero can be realized, low-end rejection of the bandwidth of the filter branch 12 can be well controlled, and good low-end rejection of the bandwidth is obtained, thereby improving the stop band rejection performance of the filter 10; in addition, the bandwidth of the filtering branch 12 ranges from 1860MHz to 1875MHz, and the bandwidth of the filtering branch 12 can be accurately controlled.
Optionally, as shown in fig. 1, the eight filter cavities of the filter branch 12 are divided into three rows arranged along a second direction y, and the second direction is perpendicular to the first direction; the fourth filtering cavity a4, the fifth filtering cavity a5 and the eighth filtering cavity A8 of the filtering branch 12 are in a row and are sequentially arranged along the first direction x; the first filtering cavity a1, the third filtering cavity A3, the sixth filtering cavity a6 and the seventh filtering cavity a7 of the filtering branch 12 are in a row and are sequentially arranged along the first direction x; the second filtering cavities a2 of the filtering branch 12 are sequentially arranged in a row along the first direction x, and the second filtering cavity a2, the third filtering cavity A3 and the fifth filtering cavity a5 are arranged in a straight line.
It can be seen that the eight filter cavities are divided into three rows arranged in sequence along the second direction y, and the eight filter cavities are regularly arranged, so as to reduce the volume of the filter branch 12 and thus the filter 10.
Optionally, first windows are respectively arranged between the first filter cavity a1 and the fourth filter cavity a4, between the fifth filter cavity a5 and the eighth filter cavity A8, and between the sixth filter cavity a6 and the eighth filter cavity A8 of the filter branch 12; a capacitive coupling assembly is provided between the first filter chamber a1 and the third filter chamber A3 of the filter branch 12.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating a structure of a capacitive coupling element in the filter of fig. 1. Optionally, the capacitive coupling assembly comprises a support clamp 70 and a coupling probe 60, the coupling probe 60 being fixed to the support clamp 70, the support clamp 70 being disposed in the window between the ninth filter chamber a9 and the eleventh filter chamber a11 of the filter branch 12. Capacitive cross coupling may be achieved by capacitive coupling elements.
Specifically, the coupling probe 60 includes a first coupling portion 610, a second coupling portion 630 and a connection portion 620, two ends of the connection portion 620 are respectively connected to the first coupling portion 610 and the second coupling portion 630, and the first coupling portion 610 and the second coupling portion 630 are located on the same side of the connection portion 620. The first coupling part 610, the connection part 620, and the second coupling part 630 are sequentially connected to form a coupling probe 60; the first coupling part 610 is coupled to the resonant rod 20 in the first filter cavity a1 such that a coupling capacitance is formed between the first coupling part 610 and the resonant rod 20, and the second coupling part 630 is coupled to the resonant rod 20 in the third filter cavity A3 such that a coupling capacitance is formed between the second coupling part 630 and the resonant rod 20.
As shown in fig. 1 and 3, the support socket 70 may be disposed on the housing 11, and the support socket 70 is provided with a through hole (not shown), wherein the connection portion 620 penetrates through the through hole to fix the coupling probe 60 on the support socket 70.
The coupling probe 60 of the present embodiment may be implemented by a metal probe, and the support socket 70 may be implemented by PTFE or engineering plastic.
Optionally, as shown in fig. 1, eight filter cavities of the filter branch 12 are sequentially window-coupled, and a second window is disposed between two filter cavities sequentially coupled by the filter branch 12. That is, a second window is arranged between the first filtering cavity a1 and the second filtering cavity a2, a second window is arranged between the second filtering cavity a2 and the third filtering cavity A3, a second window is arranged between the third filtering cavity A3 and the fourth filtering cavity a4, a second window is arranged between the fourth filtering cavity a4 and the fifth filtering cavity a5, a second window is arranged between the fifth filtering cavity a5 and the sixth filtering cavity A6, a second window is arranged between the sixth filtering cavity A6 and the seventh filtering cavity a7, and a second window is arranged between the seventh filtering cavity a7 and the eighth filtering cavity A8.
Therefore, the second window between two adjacent filter cavities on the coupling path of the filter branch 12 is pure window coupling, so that the cost of the filter 10 is reduced.
Optionally, the first window and the second window are both provided with a first tuning rod 31 for adjusting the coupling strength, and in particular, the first tuning rod 31 may be used for adjusting the coupling bandwidths of the first filter cavity a1 and the fourth filter cavity a4, the fifth filter cavity a5 and the eighth filter cavity A8, the sixth filter cavity a6 and the eighth filter cavity A8. Electromagnetic energy can be transmitted between two adjacent filter cavities on the coupling path through the filter branch 12 through the window, and the coupling bandwidth can be adjusted through the first tuning rod 31 of the filter branch.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a second tuning rod, a resonant rod and a mounting post combined structure of the filter cavity of fig. 1. Optionally, each filter cavity is provided with: a resonant rod 20 including a U-shaped sidewall 210 and a hollow interior 220 formed by the U-shaped sidewall 210; a second tuning rod 30, one end of the second tuning rod 30 being disposed within the hollow interior 220; the two ends of the U-shaped sidewall 210 are bent and extended away from the hollow cavity 220, so as to form a disc-shaped structure 230 at the two ends of the U-shaped sidewall 210 and parallel to the bottom of the U-shaped sidewall 210. The housing 11 is further provided with a mounting post 40, the U-shaped sidewall 210 is fixed on the mounting post 40, and the resonant rod 20 is fixed on the housing 11 through the mounting post 40.
The resonant rod 20, the hollow cavity 220 and the second tuning rod 30 of the present embodiment are coaxially disposed.
Further, a mounting hole (not shown) may be formed in the bottom of the U-shaped sidewall 210, one end of the mounting post 40 is fixed to the housing 11, and the other end of the mounting post 40 is mounted in the mounting hole, so as to fix the resonant rod 20 to the mounting post 40; the mounting holes may be through holes, the mounting holes may be threaded holes, and the mounting posts 40 are studs. In other embodiments, the mounting hole may also be a blind hole.
Optionally, the eight filter cavities of the present embodiment may be metal filter cavities, and the resonant rod 20 may be a metal resonant rod.
The material of the resonant rod 20 of the present embodiment may be the cut 1215 MS. Of course, in other embodiments, the resonant rod 20 may be an M8 or M4 screw rod, and may be made of copper or silver.
The eight filter cavities have the same size, so that the production is convenient, and the cost is saved. The radii of the eight filter cavities may be less than 21mm, e.g., 20mm, 19mm, 18mm, etc.
It can be seen that the resonant rod 20 can be secured to the housing 11 by the mounting post 40 and the resonant frequency of the resonant cavity can be adjusted by adjusting the depth of the second tuning rod 30 within the hollow interior 220.
Further, the filter 10 further includes a cover plate (not shown) covering the eight filter cavities, and the other end of the second tuning rod 30 is disposed on the cover plate, wherein the second tuning rod 30 may be a metal screw.
As shown in fig. 2, the first filter cavity a1 and the fourth filter cavity a4 of the filter branch 12 are inductively cross-coupled to form an inductive coupling zero L1(ii) a The fifth filter cavity A5 and the eighth filter cavity A8 are inductively cross-coupled to form an inductive coupling zero point L2(ii) a The sixth filter cavity A6 and the eighth filter cavity A8 are inductively cross-coupled to form an inductive coupling zero point L3(ii) a The first filter cavity A1 and the third filter cavity A3 of the filter branch 12 are capacitively cross-coupled to form a capacitive coupling zero point C1(ii) a To form the four cross-coupling zeros of the filter branch 12. The cross-coupling zero is also referred to as a transmission zero. The transmission zero is the transmission function of the filter 10 equal to zero, that is, the electromagnetic energy at the frequency point corresponding to the transmission zero cannot pass through the network, so that the complete isolation effect is achieved, the suppression effect on the signals outside the passband is achieved, and the high isolation among a plurality of passbands can be better achieved.
The filter 10 further comprises: a first port connected to the first filter cavity a1 of the filter branch 12; and a second port connected to the eighth filter cavity A8 of the filter branch 12.
The equivalent circuit of the filter 10 of this embodiment is shown in fig. 5, where the impedance Z1 at the input port is about 50 ohms, and the impedance Z2 at the output port is about 50 ohms; in order to ensure that electromagnetic signals are transmitted between the eight filter cavities of the filter 10, impedance adjusters ZV1 are respectively disposed between the input port and the first filter cavity a1, between adjacent filter cavities on the coupling path, between non-cascaded filter cavities forming cross coupling, and between the eighth filter cavity A8 and the output port, so as to achieve impedance matching.
The bandwidth range of the filter 10 of the present embodiment is: 1860Mhz-1875 MHz. In particular, the coupling bandwidth between the first filter cavity A1 and the second filter cavity A2 ranges from 8.5Mhz to 14 Mhz; the coupling bandwidth between the first filter cavity a1 and the third filter cavity A3 ranges from (-21) Mhz- (-15) Mhz; the coupling bandwidth between the first filter cavity a1 and the fourth filter cavity a4 ranges from 3.1Mhz to 6.7 Mhz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 ranges from 2.2Mhz to 6.7 Mhz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity a4 ranges from 11Mhz to 17 Mhz; the coupling bandwidth between the fourth filter cavity a4 and the fifth filter cavity a5 ranges from 11Mhz to 17 Mhz; the coupling bandwidth between the fifth filter cavity a5 and the sixth filter cavity a6 ranges from 11Mhz to 17 Mhz; the coupling bandwidth between the fifth filter cavity a5 and the eighth filter cavity A8 ranges from 1.2Mhz to 5.6 Mhz; the coupling bandwidth between the sixth filter cavity a6 and the seventh filter cavity a7 ranges from 5.4Mhz to 10 Mhz; the coupling bandwidth between the sixth filter cavity a6 and the eighth filter cavity A8 ranges from 12Mhz to 18 Mhz; the coupling bandwidth between the seventh filter cavity A7 and the eighth filter cavity A8 is in the range of 12Mhz-18Mhz, and can meet the design requirements.
The bandwidth range of the filtering branch 12 in this embodiment is: 1860MHz to 1875 MHz. Specifically, the resonant frequencies of the first filter cavity a1 to the eighth filter cavity A8 of the filter branch 12 are sequentially in the following ranges: 1865Mhz-1867Mhz, 1852Mhz-1854Mhz, 1862Mhz-1864Mhz, 1865Mhz-1867Mhz, 1864Mhz-1866Mhz, 1866Mhz-1868Mhz, 1876Mhz-1878Mhz, 1865Mhz-1867 Mhz. Therefore, the resonant frequency of each resonant cavity is basically within the designed bandwidth range, and the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting similar specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.
The simulation result of the filter 10 of the present embodiment is shown in fig. 6, and it can be seen from fig. 6 that, through experimental tests, as shown by the frequency band curve S1, there are two low-end coupling zero points a, b and two high-end coupling zero points c, d. The suppression of the filtering branch 12 at the frequency point 1.860GHz (m1) is-1.372 dB, the suppression of the filtering branch 12 at the frequency point 1.865GHz (m2) is-1.240 dB, the suppression of the filtering branch 12 at the frequency point 1.870GHz (m3) is-1.318 dB, the suppression of the frequency point 1.875GHz (m4) is-1.745 dB, the suppression of the filtering branch 12 at the frequency point 1.850GHz (m5) is-29.709 dB, the suppression of the filtering branch 12 at the frequency point 1.885GHz (m6) is-58.062 dB, the suppression of the filtering branch 12 at the frequency point 1.900GHz (m7) is-71.307 dB, and the suppression of the filtering branch 12 at the frequency point 1.920GHz (m8) is-80.947 dB, so that the design requirement of out-of-band suppression of the filter 10 can be satisfied.
The filter 10 of the present embodiment is an 8-order microwave filter applied to a 5G mobile communication system, and has the characteristics of a work frequency band of 1860MHz-1875MHz, strong anti-interference capability, small overall size, and light weight.
The filter 10 in the embodiment of the application has low loss, and can ensure low energy consumption of the communication module; the filter 10 is designed by combining 8-order resonant cavities, and a coupling zero structure is introduced, so that the filter has strong anti-interference capability and can ensure that a communication system is not interfered by stray signals; the filter 10 has a simple design scheme, low cost, and good structural and electrical performance stability; the filter 10 can meet the use of the current state-of-the-art 5G mobile communication system, and the filter 10 mainly relates to the 1860MHz-1875MHz frequency band.
The present application further provides a communication device, as shown in fig. 7, fig. 7 is a schematic structural diagram of an embodiment of the communication device of the present application. The communication device of the present embodiment includes an antenna 92 and a radio frequency unit 91 connected to the antenna 92, the radio frequency unit 91 includes a filter 10 as shown in the above-mentioned embodiment, and the filter 10 is used for filtering a radio frequency signal.
In other embodiments, the rf Unit 91 may be integrated with the Antenna 92 to form an Active Antenna Unit (AAU).
Some embodiments of the present application are referred to as filters and may also be referred to as combiners, i.e., dual-frequency combiners. It is understood that in other embodiments, the duplexer may be referred to as a duplexer.
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 housing;
the filtering branch is arranged on the shell and consists of eight filtering cavities which are sequentially coupled, inductive cross coupling is respectively performed between a first filtering cavity and a fourth filtering cavity, between a fifth filtering cavity and an eighth filtering cavity and between a sixth filtering cavity and the eighth filtering cavity of the filtering branch, and capacitive cross coupling is performed between the first filtering cavity and the third filtering cavity of the filtering branch so as to form four cross coupling zeros of the filtering branch;
wherein the bandwidth of the filter is 1860MHz-1875 MHz.
2. The filter according to claim 1, wherein first windows are arranged between the first filter cavity and the fourth filter cavity, between the fifth filter cavity and the eighth filter cavity, and between the sixth filter cavity and the eighth filter cavity of the filter branch;
and a capacitive coupling component is arranged between the first filtering cavity and the third filtering cavity of the filtering branch circuit.
3. The filter of claim 2, wherein the capacitive coupling assembly comprises a support chuck and a coupling probe fixed on the support chuck, the support chuck being disposed in a window between the first filter cavity and the third filter cavity of the filter branch.
4. The filter according to claim 3, wherein eight filter cavities of the filter branch are sequentially window-coupled, and a second window is disposed between two sequentially coupled filter cavities of the filter branch.
5. The filter of claim 4, wherein the first window and the second window are each provided with a first tuning rod for adjusting the coupling strength.
6. The filter according to any of claims 1-5,
the eight filter cavities of the filter branch circuit are divided into three rows arranged along a second direction, and the second direction is perpendicular to the first direction;
the fourth filtering cavity, the fifth filtering cavity and the eighth filtering cavity of the filtering branch are in a row and are sequentially arranged along the first direction;
the first filtering cavity, the third filtering cavity, the sixth filtering cavity and the seventh filtering cavity of the filtering branch are in a row and are sequentially arranged along the first direction;
the second filtering cavities of the filtering branches are sequentially arranged in a row along the first direction, and the second filtering cavities, the third filtering cavities and the fifth filtering cavities are arranged in a straight line.
7. The filter of claim 1, wherein each of the filter cavities has disposed therein:
the resonance rod comprises a U-shaped side wall and a hollow inner cavity formed by the U-shaped side wall;
a second tuning rod, one end of the second tuning rod being disposed within the hollow interior;
the two ends of the U-shaped side wall bend and extend in the direction away from the hollow inner cavity, so that disc-shaped structures are formed at the two ends of the U-shaped side wall, and the disc-shaped structures are arranged in parallel with the bottom of the U-shaped side wall.
8. The filter of claim 7, wherein the housing further comprises a mounting post, and the U-shaped sidewall is secured to the mounting post.
9. The filter of claim 8, further comprising:
the first port is connected with the first filtering cavity of the filtering branch circuit;
and the second port is connected with the eighth filtering cavity of the filtering branch circuit.
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 a radio frequency signal.
CN202010292039.0A 2020-04-14 2020-04-14 Filter and communication equipment Pending CN113540718A (en)

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Application Number Priority Date Filing Date Title
CN202010292039.0A CN113540718A (en) 2020-04-14 2020-04-14 Filter and communication equipment

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CN209434356U (en) * 2019-03-21 2019-09-24 中兴通讯股份有限公司 A kind of dielectric filter
CN209691910U (en) * 2018-12-31 2019-11-26 深圳市大富科技股份有限公司 A kind of filter, duplexer and communication equipment
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

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CN208782003U (en) * 2018-07-20 2019-04-23 深圳市大富科技股份有限公司 A kind of cross coupling structure and cavity body filter
CN209232921U (en) * 2018-12-14 2019-08-09 深圳市大富科技股份有限公司 A kind of combining formula cavity body filter and communication equipment
CN209691910U (en) * 2018-12-31 2019-11-26 深圳市大富科技股份有限公司 A kind of filter, duplexer and communication equipment
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
CN209434356U (en) * 2019-03-21 2019-09-24 中兴通讯股份有限公司 A kind of dielectric filter

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Application publication date: 20211022