CN113571857A - Filter and communication equipment - Google Patents
Filter and communication equipment Download PDFInfo
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- CN113571857A CN113571857A CN202010352412.7A CN202010352412A CN113571857A CN 113571857 A CN113571857 A CN 113571857A CN 202010352412 A CN202010352412 A CN 202010352412A CN 113571857 A CN113571857 A CN 113571857A
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- 238000004891 communication Methods 0.000 title claims abstract description 20
- 238000001914 filtration Methods 0.000 claims abstract description 210
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- 230000001939 inductive effect Effects 0.000 claims abstract description 10
- 230000008878 coupling Effects 0.000 claims description 95
- 238000010168 coupling process Methods 0.000 claims description 95
- 238000005859 coupling reaction Methods 0.000 claims description 95
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- 238000000034 method Methods 0.000 description 7
- 230000008093 supporting effect Effects 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
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- 230000000903 blocking effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
Abstract
The application discloses a filter and communication equipment. The filter includes: 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 twelve filtering cavities which are sequentially coupled, the fourth filtering cavity and the sixth filtering cavity of the filtering branch, the sixth filtering cavity and the eighth filtering cavity of the filtering branch are respectively in inductive cross coupling, and the second filtering cavity and the fourth filtering cavity and the ninth filtering cavity and the eleventh filtering cavity of the filtering branch are respectively in capacitive cross coupling so as to form five cross coupling zeros of the filtering branch; wherein the bandwidth range of the filter is 3420MHz-3600 MHz. In this way, the stop-band rejection performance of the filter can be improved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a filter and a communications device.
Background
The 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 present application finds, in long-term research and development work, that the stop band rejection performance of the existing cavity filter is poor.
Disclosure of Invention
The technical problem that this application mainly solved provides a wave filter and communication equipment to improve the stop band rejection performance of wave filter.
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 which are arranged perpendicular to each other; the filtering branch is arranged on the shell and consists of twelve filtering cavities which are sequentially coupled, the fourth filtering cavity and the sixth filtering cavity of the filtering branch, the sixth filtering cavity and the eighth filtering cavity of the filtering branch are respectively in inductive cross coupling, and the second filtering cavity and the fourth filtering cavity and the ninth filtering cavity and the eleventh filtering cavity of the filtering branch are respectively in capacitive cross coupling so as to form five cross coupling zeros of the filtering branch; wherein the bandwidth range of the filter is 3420MHz-3600 MHz.
Optionally, twelve filter cavities of the filter branch are divided into two rows arranged along the second direction; the first filtering cavity, the second filtering cavity, the fourth filtering cavity, the sixth filtering cavity, the eighth filtering cavity, the eleventh filtering cavity and the twelfth filtering cavity of the filtering branch are in a row and are sequentially arranged along the first direction; and the third filtering cavity, the fifth filtering cavity, the seventh filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the filtering branch are in a row and are sequentially arranged along the first direction. The twelve filtering cavities are divided into five rows which are sequentially arranged along the first direction, the cavities of the twelve filtering cavities are arranged regularly, the size of the filtering branch is reduced, and the size of the filter is further reduced.
Optionally, first windows are respectively arranged between a fourth filtering cavity and a sixth filtering cavity of the filtering branch, between the sixth filtering cavity and an eighth filtering cavity, and between the eighth filtering cavity and an eleventh filtering cavity; capacitive coupling probes are arranged between the second filtering cavity and the fourth filtering cavity of the filtering branch circuit and between the ninth filtering cavity and the eleventh filtering cavity of the filtering branch circuit.
Optionally, the capacitive coupling probe includes a supporting clamp seat and a coupling probe, the coupling probe is fixed on the supporting clamp seat, and the supporting clamp seat is disposed on a window between the second filtering cavity and the fourth filtering cavity of the filtering branch, and a window between the ninth filtering cavity and the eleventh filtering cavity of the filtering branch. Capacitive cross-coupling may be achieved by capacitive coupling probes.
Optionally, twelve 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. 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, metal coupling ribs are respectively disposed between the first filtering cavity and the second filtering cavity of the filtering branch, and between the eleventh filtering cavity and the twelfth filtering cavity of the filtering branch.
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. 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 twelfth filtering cavity of the filtering branch circuit. The filtering branch circuit is convenient to design and manufacture by arranging the first port and the second port, and is favorable for improving the implementation of a scheme.
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 twelve filtering cavities which are sequentially coupled, the fourth filtering cavity and the sixth filtering cavity of the filtering branch, the sixth filtering cavity and the eighth filtering cavity of the filtering branch are respectively in inductive cross coupling, and the second filtering cavity and the fourth filtering cavity and the ninth filtering cavity and the eleventh filtering cavity of the filtering branch are respectively in capacitive cross coupling so as to form five cross coupling zeros of the filtering branch; wherein the bandwidth range of the filter is 3420MHz-3600 MHz. In the embodiment of the application, the inductive cross coupling is respectively performed between the fourth filter cavity and the sixth filter cavity, between the sixth filter cavity and the eighth filter cavity, and between the eighth filter cavity and the eleventh filter cavity of the filter branch, so that the high-end rejection of the bandwidth of the filter branch can be well controlled, and the good high-end rejection of the bandwidth can be obtained, and the capacitive cross coupling is respectively performed between the second filter cavity and the fourth filter cavity, and between the ninth filter cavity and the eleventh filter cavity of the filter branch, so that two capacitive coupling zeros can be realized, the low-end rejection of the bandwidth of the filter can be well controlled, and the good low-end rejection of the bandwidth can be obtained, and therefore, the stop band rejection performance of the filter can be improved; in addition, the bandwidth range of the filtering branch circuit is 3420MHz-3600MHz, 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 structural diagram of a combined structure of a support socket and a coupling probe in the filter of the embodiment 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 twelve filter chambers, wherein the housing 11 has a first direction x and a second direction y arranged perpendicular to each other; the filtering branch 12 is arranged on the shell 11 and is composed of twelve filtering cavities which are coupled in sequence.
Specifically, the twelve filter cavities of the filter branch 12 include: a first filtering cavity A1, a second filtering cavity A2, a third filtering cavity A3, a fourth filtering cavity A4, a fifth filtering cavity A5, a sixth filtering cavity A6, a seventh filtering cavity A7, an eighth filtering cavity A8, a ninth filtering cavity A9, a tenth filtering cavity A10, an eleventh filtering cavity A11 and a twelfth filtering cavity A12; inductive cross coupling is respectively performed between a fourth filtering cavity A4 and a sixth filtering cavity A6, between the sixth filtering cavity A6 and an eighth filtering cavity A8, and between the eighth filtering cavity A8 and an eleventh filtering cavity A11 of the filtering branch 12, and capacitive cross coupling is respectively performed between a second filtering cavity A2 and a fourth filtering cavity A4, and between a ninth filtering cavity A9 and an eleventh filtering cavity A11 of the filtering branch 12; wherein the bandwidth range of the filter 10 is 3420MHz-3600 MHz.
It can be seen that, the inductive cross coupling between the fourth filter cavity a4 and the sixth filter cavity a6, between the sixth filter cavity a6 and the eighth filter cavity A8, and between the eighth filter cavity A8 and the eleventh filter cavity a11 of the filter branch 12 respectively can well control the high-end rejection of the bandwidth of the filter branch 12, and obtain better high-end rejection of the bandwidth, and the capacitive cross coupling between the second filter cavity a2 and the fourth filter cavity a4, and between the ninth filter cavity a9 and the eleventh filter cavity a11 of the filter branch 12 respectively can realize two capacitive coupling zeros, and can well control the low-end rejection of the bandwidth of the filter branch 12, and obtain better low-end rejection of the bandwidth, so that the stop band rejection performance of the filter 10 can be improved; in addition, the bandwidth range of the filtering branch circuit 12 is 3420MHz-3600MHz, and the bandwidth of the filtering branch circuit 12 can be accurately controlled.
The filter 10 is a communication device for frequency selection and signal suppression, and its filter cavity mainly plays a role of frequency control, and the filter cavity is required for the communication device related to frequency transmission and reception.
Alternatively, as shown in fig. 1, the twelve filter cavities of the filter branch 12 are divided into two rows arranged along the second direction y; the first filtering cavity a1, the second filtering cavity a2, the fourth filtering cavity a4, the sixth filtering cavity a6, the eighth filtering cavity A8, the eleventh filtering cavity a11 and the twelfth filtering cavity a12 of the filtering branch 12 are in a row and are sequentially arranged along the first direction x; the third filtering cavity A3, the fifth filtering cavity a5, the seventh filtering cavity a7, the ninth filtering cavity a9 and the tenth filtering cavity a10 of the filtering branch 12 are in a row and are sequentially arranged along the first direction x.
It can be seen that the twelve filter cavities are divided into two rows arranged in sequence along the second direction y, and the twelve filter cavities are arranged regularly, so as to reduce the volume of the filter branch 12 and thus the volume of the filter 10.
Optionally, first windows are respectively arranged between the fourth filtering cavity a4 and the sixth filtering cavity a6, between the sixth filtering cavity a6 and the eighth filtering cavity A8, and between the eighth filtering cavity A8 and the eleventh filtering cavity a11 of the filtering branch 12; capacitive coupling probes are arranged between the second filtering cavity A2 and the fourth filtering cavity A4, and between the ninth filtering cavity A9 and the eleventh filtering cavity A11 of the filtering branch circuit 12.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a supporting card socket and coupling probe combination structure in the filter of fig. 1. Optionally, the capacitive coupling probe comprises a support clamp 70 and a coupling probe 60, the coupling probe 60 is fixed on the support clamp 70, and the support clamp 70 is disposed in a window between the second filter cavity a2 and the fourth filter cavity a4 of the filter branch 12, and a window between the sixth filter cavity a6 and the eighth filter cavity A8. Capacitive cross-coupling may be achieved by capacitive coupling probes.
Specifically, the coupling probe 60 includes a first coupling portion 610, a second coupling portion 620 and a connecting portion 630, two ends of the connecting portion 630 are respectively connected to the first coupling portion 610 and the second coupling portion 620, and the first coupling portion 610 and the second coupling portion 620 are located on the same side of the connecting portion 630. The first coupling part 610, the connection part 630 and the second coupling part 620 are sequentially connected to form a coupling probe 60; the first coupling part 610 is coupled to the resonance rod 20 in the second filter cavity a2 such that a coupling capacitance is formed between the first coupling part 610 and the resonance rod 20, and the second coupling part 620 is coupled to the resonance rod 20 in the fourth filter cavity a4 such that a coupling capacitance is formed between the second coupling part 620 and the resonance rod 20.
Similarly, a coupling probe is also arranged between the sixth filter cavity a6 and the eighth filter cavity A8, and the structure and the specific connection mode of the coupling probe are similar to those of the coupling probe arranged between the second filter cavity a2 and the fourth filter cavity a4, which are not described herein again.
As shown in fig. 1 and 3, the supporting socket 70 may be disposed on the housing 11, and the supporting socket 70 is provided with a through hole (not shown), wherein the connecting portion 630 penetrates through the through hole to fix the coupling probe 60 on the supporting socket 70.
The coupling probe 60 of the present embodiment may be implemented by a metal probe, and the support socket 70 is implemented by PTFE or engineering plastic.
Optionally, as shown in fig. 1, twelve filter cavities of the filter branch 12 are sequentially window-coupled, and a second window is disposed between two filter cavities of the filter branch 12 that are sequentially coupled. Namely, the window coupling between the first filtering cavity a1 and the second filtering cavity a2, the window coupling between the second filtering cavity a2 and the third filtering cavity A3, the window coupling between the third filtering cavity A3 and the fourth filtering cavity A4, the window coupling between the fourth filtering cavity A4 and the fifth filtering cavity A5, the window coupling between the fifth filtering cavity A5 and the sixth filtering cavity A6, the window coupling between the sixth filtering cavity A6 and the seventh filtering cavity A7, the window coupling between the seventh filtering cavity A7 and the eighth filtering cavity A8, the window coupling between the eighth filtering cavity A8 and the ninth filtering cavity A9, the window coupling between the ninth filtering cavity A9 and the tenth filtering cavity a10, the window coupling between the tenth filtering cavity a10 and the eleventh filtering cavity a11, and the window coupling between the eleventh filtering cavity a11 and the twelfth filtering cavity a 12.
Therefore, the two adjacent filter cavities on the coupling path of the filter branch 12 are coupled by pure windows, 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 fourth filter cavity a4 and the sixth filter cavity a6, the sixth filter cavity a6 and the eighth filter cavity A8, and the eighth filter cavity A8 and the eleventh filter cavity a 11. 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.
In addition, metal coupling ribs 80 are respectively arranged between the first filter cavity a1 and the second filter cavity a2, and between the eleventh filter cavity a11 and the twelfth filter cavity a12 of the filter branch 13.
The metal coupling rib 80 can improve the coupling strength between two adjacent filter cavities on the coupling path of the filter branch 13, that is, the coupling strength between the first filter cavity a1 and the second filter cavity a2 and between the eleventh filter cavity a11 and the twelfth filter cavity a 12.
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 twelve 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 twelve filter cavities have the same size, so that the production is convenient, and the cost is saved. The radius of the twelve 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) disposed on the twelve 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 fourth filter cavity a4 and the sixth filter cavity a6 of the filter branch 12 are inductively cross-coupled to form an inductive coupling zero L1(ii) a The sixth filter cavity A6 and the eighth filter cavity A8 are inductively cross-coupled to form an inductive coupling zero point L2(ii) a The eighth filter cavity A8 and the eleventh filter cavity A11 are inductively cross-coupled to form an inductive coupling zero point L3(ii) a The second filter cavity A2 and the fourth filter cavity A4 of the filter branch 12 are capacitively cross-coupled to form a capacitive coupling zero point C1(ii) a The ninth filter cavity A9 and the eleventh filter cavity A11 are capacitively cross-coupled to form a capacitive coupling zero point C2(ii) a To form five 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 twelfth filter cavity a12 of the filter branch 12. The filtering branch 12 is convenient to design and manufacture by arranging the first port and the second port, and is beneficial to the realization of a lifting scheme.
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 twelve 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 twelfth filter cavity a12 and the output port, so as to achieve impedance matching.
The bandwidth range of the filter 10 of the present embodiment is: 3420MHz to 3600 MHz. Specifically, the coupling bandwidth between the first port and the first filter cavity A1 ranges from 180Mhz to 204 Mhz; the coupling bandwidth between the first filter cavity a1 and the second filter cavity a2 ranges from 142Mhz to 162 Mhz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 ranges from 79Mhz to 92 Mhz; the coupling bandwidth between the second filter cavity a2 and the fourth filter cavity a4 ranges from (-68) Mhz- (-57) Mhz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity a4 ranges from 69Mhz to 80 Mhz; the coupling bandwidth between the fourth filter cavity a4 and the fifth filter cavity a5 ranges from 69Mhz to 80 Mhz; the coupling bandwidth between the fourth filter cavity a4 and the sixth filter cavity a6 ranges from 52Mhz to 62 Mhz; the coupling bandwidth between the fifth filter cavity a5 and the sixth filter cavity a6 ranges from 66Mhz to 78 Mhz; the coupling bandwidth between the sixth filter cavity a6 and the seventh filter cavity a7 ranges from 79Mhz to 92 Mhz; the coupling bandwidth between the sixth filter cavity a6 and the eighth filter cavity A8 ranges from 29Mhz to 37 Mhz; the coupling bandwidth between the seventh filter cavity a7 and the eighth filter cavity A8 ranges from 81Mhz to 94 Mhz; the coupling bandwidth between the eighth filter cavity A8 and the ninth filter cavity a9 ranges from 2.6Mhz to 7.1 Mhz; the coupling bandwidth between the eighth filter cavity A8 and the eleventh filter cavity a11 ranges from 22Mhz to 29 Mhz; the coupling bandwidth between the ninth filter cavity a9 and the tenth filter cavity a10 ranges from 33Mhz to 41 Mhz; the coupling bandwidth between the ninth filter cavity a9 and the eleventh filter cavity a11 ranges from 78Mhz to 91 Mhz; the coupling bandwidth between the tenth filter cavity a10 and the eleventh filter cavity a11 ranges from 53Mhz to 63 Mhz; the coupling bandwidth between the eleventh filter cavity a11 and the twelfth filter cavity a12 ranges from 142Mhz to 162 Mhz; the coupling bandwidth between the twelfth filter cavity a12 and the second port is in the range of 180Mhz-204Mhz, which can meet the design requirements.
Therefore, the resonant frequencies of the first filter cavity a1 through the twelfth filter cavity a12 of the filter 10 are sequentially located in the following ranges: 3507Mhz-3509Mhz, 3448Mhz-3450Mhz, 3510Mhz-3512Mhz, 3568Mhz-3570Mhz, 3542Mhz-3544Mhz, 3543Mhz-3545Mhz, 3510Mhz-3512Mhz, 3489Mhz-3491Mhz, 3426Mhz-3428Mhz, 3507Mhz-3509Mhz, and 3507Mhz-3509 Mhz. Therefore, the resonant frequency of each resonant cavity is within the designed bandwidth range, so that 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 known from fig. 6 that the bandwidth of the filter 10 of the present embodiment is about 3420MHz to 3600 MHz; as shown in the frequency band curve S1, there are two low-end coupling zero points a and b and one high-end coupling zero point c; the filter branch 12 has five cross-coupling zeros, but since the same rf parameters of the zeros will result in the same for some simulation points, three cross-coupling zeros are shown in the simulation. The suppression of the frequency point 3.420GHz (m1) is-1.022 dB, the suppression of the frequency point 3.600GHz (m2) is-0.857 dB, the suppression of the frequency point 3.300GHz (m3) is-109.315 dB, the suppression of the frequency point 3.399GHz (m4) is-76.366 dB, the suppression of the frequency point 3.610GHz (m5) is-19.771 dB, the suppression of the frequency point 3.626GHz (m6) is-54.101 dB, the suppression of the frequency point 3.700GHz (m7) is-91.042 dB, and the suppression of the frequency point 3.800GHz (m8) is-125.300 dB, so the design requirement of out-of-band suppression of the filter 10 can be met.
The filter 10 of the present embodiment is a 12-order microwave filter applied to a 5G mobile communication system, and has the characteristics of 3420MHz to 3600MHz working frequency band, 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 12-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 latest 5G mobile communication system, and the filter 10 mainly relates to the 3420MHz-3600MHz 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 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 twelve filtering cavities which are sequentially coupled, the fourth filtering cavity and the sixth filtering cavity of the filtering branch, the sixth filtering cavity and the eighth filtering cavity of the filtering branch are respectively in inductive cross coupling, and the second filtering cavity and the fourth filtering cavity and the ninth filtering cavity and the eleventh filtering cavity of the filtering branch are respectively in capacitive cross coupling so as to form five cross coupling zeros of the filtering branch;
wherein the bandwidth range of the filter is 3420MHz-3600 MHz.
2. The filter of claim 1,
twelve filter cavities of the filter branch circuit are divided into two rows arranged along the second direction;
the first filtering cavity, the second filtering cavity, the fourth filtering cavity, the sixth filtering cavity, the eighth filtering cavity, the eleventh filtering cavity and the twelfth filtering cavity of the filtering branch are in a row and are sequentially arranged along the first direction;
and the third filtering cavity, the fifth filtering cavity, the seventh filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the filtering branch are in a row and are sequentially arranged along the first direction.
3. The filter according to claim 2, wherein first windows are respectively arranged between the fourth filter cavity and the sixth filter cavity, between the sixth filter cavity and the eighth filter cavity, and between the eighth filter cavity and the eleventh filter cavity of the filter branch;
capacitive coupling probes are arranged between the second filtering cavity and the fourth filtering cavity of the filtering branch circuit and between the ninth filtering cavity and the eleventh filtering cavity of the filtering branch circuit.
4. The filter according to claim 3, wherein the capacitive coupling probe comprises a support clamp seat and a coupling probe, the coupling probe is fixed on the support clamp seat, and a window between the second filter cavity and the fourth filter cavity, and a window between the ninth filter cavity and the eleventh filter cavity of the filter branch are provided with the support clamp seat.
5. The filter according to claim 4, wherein twelve 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.
6. The filter of claim 5, wherein the first window and the second window are each provided with a first tuning rod for adjusting the coupling strength.
7. The filter according to claim 6, wherein metal coupling ribs are respectively disposed between the first filter cavity and the second filter cavity, and between the eleventh filter cavity and the twelfth filter cavity of the filter branch.
8. The filter of claim 7, 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.
9. The filter of claim 7, wherein the housing further comprises a mounting post, the U-shaped sidewall being secured to the mounting post;
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 twelfth 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010352412.7A CN113571857A (en) | 2020-04-28 | 2020-04-28 | Filter and communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010352412.7A CN113571857A (en) | 2020-04-28 | 2020-04-28 | Filter and communication equipment |
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| Publication Number | Publication Date |
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| CN113571857A true CN113571857A (en) | 2021-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010352412.7A Pending CN113571857A (en) | 2020-04-28 | 2020-04-28 | Filter and communication equipment |
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| CN (1) | CN113571857A (en) |
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