CN113571855A - Filter and communication equipment - Google Patents
Filter and communication equipment Download PDFInfo
- Publication number
- CN113571855A CN113571855A CN202010351808.XA CN202010351808A CN113571855A CN 113571855 A CN113571855 A CN 113571855A CN 202010351808 A CN202010351808 A CN 202010351808A CN 113571855 A CN113571855 A CN 113571855A
- Authority
- CN
- China
- Prior art keywords
- cavity
- emission
- filter
- filtering
- receiving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004891 communication Methods 0.000 title claims abstract description 18
- 238000001914 filtration Methods 0.000 claims abstract description 167
- 238000006880 cross-coupling reaction Methods 0.000 claims abstract description 28
- 230000001939 inductive effect Effects 0.000 claims abstract description 16
- 230000008878 coupling Effects 0.000 claims description 91
- 238000010168 coupling process Methods 0.000 claims description 91
- 238000005859 coupling reaction Methods 0.000 claims description 91
- 239000002184 metal Substances 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 238000010586 diagram Methods 0.000 description 22
- 238000000034 method Methods 0.000 description 11
- 230000001629 suppression Effects 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000002955 isolation Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Images
Classifications
-
- 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
- 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
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; and the transmitting and filtering branch is arranged on the shell and consists of ten transmitting and filtering cavities which are sequentially coupled, a third transmitting and filtering cavity and a fifth transmitting and filtering cavity of the transmitting and filtering branch, a sixth transmitting and filtering cavity and an eighth transmitting and filtering cavity of the transmitting and filtering branch, and an eighth transmitting and filtering cavity and a tenth transmitting and filtering cavity of the transmitting and filtering branch are respectively in inductive cross coupling, wherein the bandwidth range of the transmitting and filtering branch is 617-652 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 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: providing a filter comprising a housing having a first direction and a second direction arranged perpendicular to each other; and the transmitting and filtering branch is arranged on the shell and consists of ten transmitting and filtering cavities which are sequentially coupled, a third transmitting and filtering cavity and a fifth transmitting and filtering cavity of the transmitting and filtering branch, a sixth transmitting and filtering cavity and an eighth transmitting and filtering cavity of the transmitting and filtering branch, and an eighth transmitting and filtering cavity and a tenth transmitting and filtering cavity of the transmitting and filtering branch are respectively in inductive cross coupling, wherein the bandwidth range of the transmitting and filtering branch is 617-652 MHz.
Optionally, ten transmitting wave cavities of the transmitting and filtering branch are divided into six rows arranged along the second direction; the seventh emission filter cavity and the tenth emission filter cavity of the emission filter branch are in a row and are sequentially arranged along the second direction; the sixth emission filtering cavity, the eighth emission filtering cavity and the ninth emission filtering cavity of the emission filtering branch are in a row and are sequentially arranged along the second direction; the fifth emission filtering cavities of the emission filtering branch are in a row and are sequentially arranged along the second direction; a fourth emission filtering cavity and a third emission filtering cavity of the emission filtering branch are in a row and are arranged along the second direction, wherein the third emission filtering cavity is close to a midline of the shell in the second direction relative to the fourth emission filtering cavity; the second emission filtering cavities of the emission filtering branch are in a row and are sequentially arranged along the second direction; the first emission filtering cavities of the emission filtering branches are in a row and are sequentially arranged along the second direction. The ten emission filter cavities are divided into six rows which are sequentially arranged along the second direction, and the ten emission filter cavities are regularly arranged, so that the volume of the emission filter branch is reduced, and further, the volume of the filter is reduced.
Optionally, the first emission filter cavity, the second emission filter cavity, the third emission filter cavity and the ninth emission filter cavity of the emission filter branch are arranged in a straight line; a fourth emission filtering cavity, a fifth emission filtering cavity, an eighth emission filtering cavity and a tenth emission filtering cavity of the emission filtering branch are arranged in a straight line; and the sixth emission filtering cavity and the seventh emission filtering cavity of the emission filtering branch are arranged in a straight line. The ten emission filter cavities are divided into three rows and arranged in a straight line, so that the ten emission filter cavities are regularly arranged, the size of the emission filter branch is reduced, and the size of the filter is further reduced.
Optionally, ten emission filter cavities of the emission filter branch are sequentially window-coupled, and first metal coupling ribs are respectively disposed between a first emission filter cavity and a second emission filter cavity of the emission filter branch, between the second emission filter cavity and a third emission filter cavity, between the third emission filter cavity and a fourth emission filter cavity, between a fifth emission filter cavity and a sixth emission filter cavity, between a seventh emission filter cavity and an eighth emission filter cavity, between the eighth emission filter cavity and a ninth emission filter cavity, and between the ninth emission filter cavity and a tenth emission filter cavity. The pure window coupling is adopted between the two adjacent filtering cavities on the transmitting and filtering branch circuit coupling path, so that the cost of the filter is reduced, and the coupling strength between the two adjacent filtering cavities on the transmitting and filtering branch circuit coupling path is improved through the first metal coupling rib.
Optionally, each emission filter cavity is provided with a first mounting post, a first resonance rod and a first tuning rod; the first resonance rod comprises a first U-shaped side wall and a first hollow inner cavity formed by the first U-shaped side wall; the first tuning rod, one end of the first tuning rod is arranged in the first hollow inner cavity; the two ends of the first U-shaped side wall bend and extend in a direction departing from the first hollow inner cavity so as to form first disc-shaped structures at the two ends of the first U-shaped side wall, and the first disc-shaped structures are arranged in parallel with the bottom of the first U-shaped side wall; the first U-shaped side wall is fixed to the first mounting post. The first resonant rod is securable to the housing by a first mounting post and the resonant frequency of the first resonant cavity is adjustable by adjusting the depth of the first tuning rod within the first hollow cavity.
Optionally, the filter further comprises: and the receiving and filtering branch is arranged on the shell and consists of ten receiving and filtering cavities which are sequentially coupled, the second receiving and filtering cavity and the fifth receiving and filtering cavity of the receiving and filtering branch, the third receiving and filtering cavity and the fifth receiving and filtering cavity, and the sixth receiving and filtering cavity and the eighth receiving and filtering cavity of the receiving and filtering branch are respectively in capacitive cross coupling, and the bandwidth range of the receiving and filtering branch is 663MHz-698 MHz. The receiving filter branch circuit forms three capacitive cross coupling zero points so as to improve the isolation between the receiving filter branch circuit and the transmitting filter branch circuit.
Optionally, the receiving filter branches are divided into three columns arranged along the first direction; the fourth receiving filter cavity and the seventh receiving filter cavity of the receiving filter branch are in a row and are sequentially arranged along the first direction; the third receiving filter cavity, the fifth receiving filter cavity, the sixth receiving filter cavity and the eighth receiving filter cavity of the receiving filter branch are in a row and are sequentially arranged along the first direction; the first receiving filter cavity, the second receiving filter cavity and the ninth receiving filter cavity of the receiving filter branch are in a row and are sequentially arranged along the first direction. The receiving filter branches are divided into three rows which are sequentially arranged along the first direction, and the nine receiving filter cavities are regularly arranged, so that the size of the receiving filter branches is reduced, and further, the size of the filter is reduced.
Optionally, nine receiving filter cavities of the receiving filter branch are sequentially window-coupled, and second metal coupling ribs are respectively disposed between a first receiving filter cavity and a second receiving filter cavity of the receiving filter branch, between the second receiving filter cavity and a third receiving filter cavity, between the third receiving filter cavity and a fourth receiving filter cavity, between the fourth receiving filter cavity and a fifth receiving filter cavity, between the fifth receiving filter cavity and a sixth receiving filter cavity, between the sixth receiving filter cavity and a seventh receiving filter cavity, between the seventh receiving filter cavity and an eighth receiving filter cavity, and between the eighth receiving filter cavity and the ninth receiving filter cavity. The pure window coupling is adopted between the two adjacent filtering cavities on the receiving filtering branch circuit coupling path, so that the cost of the filter is reduced, and the coupling strength between the two adjacent filtering cavities on the receiving filtering branch circuit coupling path can be improved through the second metal coupling rib.
Each receiving filter cavity is provided with a second mounting column, a second resonance rod and a second tuning rod; the second resonance rod comprises a second U-shaped side wall and a second hollow inner cavity formed by the second U-shaped side wall; the second tuning rod, one end of the second tuning rod is arranged in the second hollow inner cavity; the two ends of the second U-shaped side wall bend and extend in the direction departing from the second hollow inner cavity so as to form second disc-shaped structures at the two ends of the second U-shaped side wall, and the second disc-shaped structures are arranged in parallel with the bottom of the second U-shaped side wall; the second U-shaped side wall is fixed to the second mounting post. The disc-shaped structures at the two ends of the second U-shaped side wall can increase the signal coupling amount of the second resonance rod. The second resonant rod may be secured to the housing by a second mounting post, and the resonant frequency of the second resonant cavity may be adjusted by adjusting the depth of the second tuning rod within the second hollow cavity.
Flying rods are respectively arranged between the second receiving filter cavity and the fifth receiving filter cavity of the receiving filter branch circuit, between the third receiving filter cavity and the fifth receiving filter cavity, and between the sixth receiving filter cavity and the eighth receiving filter cavity; the flying rod is arranged in a sheet shape and comprises a first coupling part, a second coupling part and a connecting part, and two ends of the connecting part are respectively connected with the first coupling part and the second coupling part. The flying rod can realize capacitive cross coupling, and the flying rod arranged in a sheet shape can ensure that the flying rod has simple structure and is convenient to process and manufacture.
Optionally, the filter further comprises: the first port is connected with the first receiving filter cavity of the receiving filter branch circuit and the first transmitting filter cavity of the transmitting filter branch circuit; the second port is connected with a tenth transmitting and filtering cavity of the transmitting and filtering branch circuit; and the third port is connected with the ninth receiving filter cavity of the receiving filter branch circuit. The transmitting filtering branch and the receiving filtering branch share the first port, so that the cost can be saved, and the size of the filter can be reduced.
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; and the transmitting and filtering branch is arranged on the shell and consists of ten transmitting and filtering cavities which are sequentially coupled, a third transmitting and filtering cavity and a fifth transmitting and filtering cavity of the transmitting and filtering branch, a sixth transmitting and filtering cavity and an eighth transmitting and filtering cavity of the transmitting and filtering branch, and an eighth transmitting and filtering cavity and a tenth transmitting and filtering cavity of the transmitting and filtering branch are respectively in inductive cross coupling, wherein the bandwidth range of the transmitting and filtering branch is 617-652 MHz. The third emission filter cavity and the fifth emission filter cavity, the sixth emission filter cavity and the eighth emission filter cavity, and the eighth emission filter cavity and the tenth emission filter cavity of the emission filter branch circuit are respectively coupled in an inductive cross manner, so that the high-end rejection of the bandwidth of the emission filter branch circuit can be well controlled, and better high-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 of the transmitting and filtering branch is in the range of 617MHz-652MHz, and the bandwidth of the transmitting and filtering branch 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 a first 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 first tuning rod, a first resonant rod and a first mounting post assembly of the launch filter cavity of the embodiment of FIG. 1;
FIG. 4 is a schematic diagram of an equivalent circuit configuration of the filter of the embodiment of FIG. 1;
FIG. 5 is a diagram illustrating a simulated structure of the filter of the embodiment of FIG. 1;
FIG. 6 is a schematic diagram of the structure of a second embodiment of the filter of the present application;
FIG. 7 is a schematic diagram of the topology of the filter of the embodiment of FIG. 6;
FIG. 8 is a schematic structural diagram of a combination structure of a flying rod and a supporting clamping seat in the filter of FIG. 6;
FIG. 9 is a schematic diagram of an equivalent circuit configuration of the filter of the embodiment of FIG. 6;
FIG. 10 is a diagram illustrating a simulated structure of the filter of the embodiment of FIG. 6;
FIG. 11 is a schematic diagram showing an equivalent circuit configuration of a filter according to a third embodiment;
fig. 12 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 a transmitting filter branch 12. Wherein the housing 11 has a first direction x and a second direction y arranged perpendicular to each other; and the transmitting and filtering branch 12 is arranged on the shell 11 and consists of ten transmitting and filtering cavities which are coupled in sequence.
Specifically, the ten emission filter cavities of the emission filter branch 12 include a first emission filter cavity a1, a second emission filter cavity a2, a third emission filter cavity A3, a fourth emission filter cavity a4, a fifth emission filter cavity a5, a sixth emission filter cavity a6, a seventh emission filter cavity a7, an eighth emission filter cavity A8, a ninth emission filter cavity a9, and a tenth emission filter cavity a 10; the third emission filter cavity A3, the fifth emission filter cavity A5, the sixth emission filter cavity A6, the eighth emission filter cavity A8, the eighth emission filter cavity A8 and the tenth emission filter cavity A10 are in inductive cross coupling respectively; the bandwidth range of the transmitting and filtering branch 12 is 617-652 MHz.
It can be seen that, the third emission filter cavity A3 and the fifth emission filter cavity a5, the sixth emission filter cavity a6 and the eighth emission filter cavity A8, and the eighth emission filter cavity A8 and the tenth emission filter cavity a10 of the emission filter branch 12 are inductively cross-coupled, so that the high-end rejection of the bandwidth of the emission filter branch 12 can be well controlled, and a better high-end rejection of the bandwidth can be obtained, thereby improving the stop-band rejection performance of the filter 10; in addition, the bandwidth of the transmitting and filtering branch 12 ranges from 617MHz to 652MHz, and the bandwidth of the transmitting and filtering branch 12 can be precisely controlled.
Alternatively, as shown in fig. 1, the ten transmitting wave cavities of the transmitting filter branch 12 are divided into six rows arranged along the second direction y; the seventh emission filter cavity a7 and the tenth emission filter cavity a10 of the emission filter branch 12 are in a row and are sequentially arranged along the second direction y; the sixth emission filter cavity a6, the eighth emission filter cavity A8 and the ninth emission filter cavity a9 of the emission filter branch 12 are in a row and are sequentially arranged along the second direction y; the fifth emission filter cavities a5 of the emission filter branch 12 are in a row and are sequentially arranged along the second direction y; the fourth emission filter cavity a4 and the third emission filter cavity A3 of the emission filter branch 12 are in a row and are arranged along the second direction y, wherein the third emission filter cavity A3 is close to the midline of the housing 11 in the second direction y relative to the fourth emission filter cavity a 4; the second emission filter cavities a2 of the emission filter branch 12 are in a row and are sequentially arranged along the second direction y; the first emission filter cavities a1 of the emission filter branch 12 are arranged in a row and are sequentially arranged along the second direction y.
It can be seen that the ten emission filter cavities are divided into six rows arranged along the second direction y, and the ten emission filter cavities are arranged regularly, so as to reduce the volume of the emission filter branch 12, and thus the volume of the filter 10.
Optionally, as shown in fig. 1, the first emission filter cavity a1, the second emission filter cavity a2, the third emission filter cavity A3 and the ninth emission filter cavity a9 of the emission filter branch 12 are arranged in a straight line; the fourth emission filter cavity A4, the fifth emission filter cavity A5, the eighth emission filter cavity A8 and the tenth emission filter cavity A10 of the emission filter branch circuit 12 are arranged in a straight line; the sixth emission filter cavity a6 and the seventh emission filter cavity a7 of the emission filter branch 12 are arranged in a straight line. The ten emission filter cavities are divided into three rows and arranged in a straight line, so that the ten emission filter cavities are regularly arranged, the volume of the emission filter branch 12 is reduced, and the volume of the filter 10 is further reduced.
Optionally, as shown in fig. 1, ten emission filter cavities of the emission filter branch 12 are sequentially window-coupled, that is, a first emission filter cavity a1 is window-coupled to a second emission filter cavity a2, a second emission filter cavity a2 is window-coupled to a third emission filter cavity A3, a third emission filter cavity A3 is window-coupled to a fourth emission filter cavity a4, a fourth emission filter cavity a4 is window-coupled to a fifth emission filter cavity a5, a fifth emission filter cavity a5 is window-coupled to a sixth emission filter cavity A6, a sixth emission filter cavity A6 is window-coupled to a seventh emission filter cavity a7, a seventh emission filter cavity a7 is window-coupled to an eighth emission filter cavity A8, an eighth emission filter cavity A8 is window-coupled to a ninth emission filter cavity a9, and a ninth emission filter cavity a9 is window-coupled to a tenth emission filter cavity a 10. In addition, first metal coupling ribs 80 are respectively arranged between first metal coupling ribs and between first emission filter cavity a1 and second emission filter cavity a2, between second emission filter cavity a2 and third emission filter cavity A3, between third emission filter cavity A3 and fourth emission filter cavity a4, between fifth emission filter cavity a5 and sixth emission filter cavity A6, between seventh emission filter cavity a7 and eighth emission filter cavity A8, between eighth emission filter cavity A8 and ninth emission filter cavity a9, and between ninth emission filter cavity a9 and tenth emission filter cavity a10 of the emission filter branch 12.
Therefore, pure window coupling is adopted between two adjacent filter cavities on the coupling path of the transmitting filter branch 12, so that the cost of the filter 10 is reduced, and the coupling strength between two adjacent filter cavities on the coupling path of the transmitting filter branch 12 is improved through the first metal coupling rib 80.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a combination structure of a first tuning rod, a first resonant rod and a first mounting post of the transmission filter cavity in fig. 1. As shown in fig. 1 and 3, each emission filter cavity is provided with a first mounting post 40, a first resonant rod 20, and a first tuning rod 30. Wherein, the first resonant rod 20 comprises a first U-shaped sidewall 210 and a first hollow inner cavity 220 formed by the first U-shaped sidewall 210; one end of the first tuning rod 30 is disposed within the first hollow interior 220 and the resonant frequency of the first resonant cavity can be adjusted by adjusting the depth of the first tuning rod 30 within the first hollow interior 220. The two ends of the first U-shaped sidewall 210 are bent and extended in a direction away from the first hollow cavity 220, so as to form a first disc-shaped structure 230 at the two ends of the first U-shaped sidewall 210, and the first disc-shaped structure 230 is parallel to the bottom of the first U-shaped sidewall 210. The first U-shaped sidewall 210 is fixed to the first mounting post 40, and optionally, as shown in fig. 3, the first U-shaped sidewall 210 is fixed to the first mounting post 40, and the first resonant rod 20 is fixed to the housing 11 through the first mounting post 40. In this embodiment, the first resonant rod 20, the first hollow cavity 220 and the first tuning rod 30 are coaxially disposed.
Further, a mounting hole (not shown) may be provided on the bottom of the first U-shaped sidewall 210, one end of the first mounting post 40 is fixed on the housing 11, and the other end of the first mounting post 40 is mounted in the mounting hole, so as to fix the first resonant rod 20 on the first mounting post 40; the mounting holes may be through holes, the mounting holes may be threaded holes, and the first mounting post 40 is a stud. In other embodiments, the mounting hole may also be a blind hole.
Alternatively, the transmitting filter cavity of the present embodiment may be a metal filter cavity, and the first resonant rod 20 may be a metal resonant rod.
The material of the first resonant rod 20 of the present embodiment may be the cut 1215 MS. Of course, in other embodiments, the first resonant rod 20 may also be an M8 or M4 screw rod, and the like, and is made of copper or silver.
The ten emission filter cavities of the emission filter branch 12 have the same size, so that the production is convenient, and the cost is saved. The ten emission filter cavities may have a radius of less than 21mm, e.g., 20mm, 19mm, 18mm, etc.
It can be seen that the first resonant rod 20 can be fixed to the housing 11 by the first mounting post 40, and the resonant frequency of the first resonant cavity can be adjusted by adjusting the depth of the first tuning rod 30 within the first hollow interior 220.
Further, the filter 10 further includes a cover plate (not shown) disposed on the eleven emission filter cavities, and the other end of the first tuning rod 30 is disposed on the cover plate, wherein the first tuning rod 30 may be a metal screw.
As shown in FIG. 2, the third emission filter cavity A3 and the fifth emission filter cavity A5 are inductively cross-coupled to form an inductive coupling zero L1. The sixth emission filter cavity A6 and the eighth emission filter cavity A8 are inductively cross-coupled to form an inductive coupling zero point L2The eighth emission filter cavity A8 and the tenth emission filter cavity A10 are inductively cross-coupled to form an inductive coupling zero point L3To form the three cross-coupled zeros of the transmit filter branch 12. Wherein, the cross coupling zero point is also called as transmission zero point, the transmission zero point is that the transmission function is equal to zero, namely, the electromagnetic energy can not pass through the network on the frequency point corresponding to the transmission zero point, thereby playing the role of complete isolationThe high-isolation filter has the advantages that the signal outside the passband is restrained, and high isolation among a plurality of passbands can be better realized.
Optionally, the first embodiment may be configured with windows respectively between the third emission filter cavity A3 and the fifth emission filter cavity a5, between the sixth emission filter cavity A6 and the eighth emission filter cavity A8, and between the eighth emission filter cavity A8 and the tenth emission filter cavity a10, through which inductive cross coupling between the third emission filter cavity A3 and the fifth emission filter cavity a5, between the sixth emission filter cavity A6 and the eighth emission filter cavity A8, and between the eighth emission filter cavity A8 and the tenth emission filter cavity a10 may be achieved.
Optionally, to adjust the coupling strength of the inductive cross-coupling, an adjustment bar may be arranged at the window. In other embodiments, to improve the coupling strength of the inductive cross coupling, metal coupling ribs may be disposed at the window, and the inductive coupling strength between the third emission filter cavity A3 and the fifth emission filter cavity a5, between the sixth emission filter cavity a6 and the eighth emission filter cavity A8, and between the eighth emission filter cavity A8 and the tenth emission filter cavity a10 may be adjusted through the metal coupling ribs.
The equivalent circuit of the first embodiment filter 10 is shown in fig. 4, with an impedance Z1 at the input port of about 50 ohms and an impedance Z2 at the output port of about 50 ohms; in order to ensure that electromagnetic signals are transmitted between the ten emission filter cavities of the emission filter branch 12, impedance adjusters ZV1 are respectively disposed between the input port and the first emission filter cavity a1, between adjacent filter cavities on the coupling path, between non-cascaded filter cavities forming cross coupling, and between the tenth emission filter cavity a10 and the output port, so as to implement impedance matching.
The bandwidth range of the transmitting filtering branch 12 of the filter 10 of the present embodiment is: 617MHz-652 MHz. Specifically, the coupling bandwidth between the first port and the first emission filter cavity a1 ranges from 36Mhz to 44 Mhz; the coupling bandwidth between the first emission filter cavity a1 and the second emission filter cavity a2 ranges from 29Mhz to 36 Mhz; the coupling bandwidth between the second emission filter cavity a2 and the third emission filter cavity A3 ranges from 20Mhz to 26 Mhz; the coupling bandwidth between the third emission filter cavity A3 and the fourth emission filter cavity a4 ranges from 17Mhz to 23 Mhz; the coupling bandwidth between the third emission filter cavity A3 and the fifth emission filter cavity a5 ranges from 4.7Mhz to 9.5 Mhz; the coupling bandwidth between the fourth emission filter cavity a4 and the fifth emission filter cavity a5 ranges from 16Mhz to 22 Mhz; the coupling bandwidth between the fifth emission filter cavity a5 and the sixth emission filter cavity a6 ranges from 17Mhz to 24 Mhz; the coupling bandwidth between the sixth emission filter cavity a6 and the seventh emission filter cavity a7 ranges from 16Mhz to 22 Mhz; the coupling bandwidth between the sixth emission filter cavity a6 and the eighth emission filter cavity A8 ranges from 6.4Mhz to 11 Mhz; the coupling bandwidth between the seventh emission filter cavity a7 and the eighth emission filter cavity A8 ranges from 16Mhz to 22 Mhz; the coupling bandwidth between the eighth emission filter cavity A8 and the ninth emission filter cavity a9 ranges from 15Mhz to 21 Mhz; the coupling bandwidth between the eighth emission filter cavity A8 and the tenth emission filter cavity a10 ranges from 14Mhz to 20 Mhz; the coupling bandwidth between the ninth emission filter cavity a9 and the tenth emission filter cavity a10 ranges from 24Mhz to 31 Mhz; the coupling bandwidth between the tenth emission filter cavity a10 and the second port is in the range of 36Mhz-44Mhz, which can meet the design requirement.
Therefore, the resonant frequencies of the first emission filter cavity a1 to the tenth emission filter cavity a10 of the filter 10 are sequentially located in the following ranges: 633Mhz-635Mhz, 640Mhz-642Mhz, 633Mhz-635Mhz, 642Mhz-644Mhz, 632Mhz-634Mhz, 634 Mhz-634Mhz, 645Mhz-647 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 first embodiment is shown in fig. 5, and as can be seen from fig. 5, the bandwidth range of the transmitting and filtering branch 12 of this embodiment is 617-652 MHz; as shown in the frequency band curve S1, there are two low-end coupling zeros a and b; the transmit filter branch 12 has three cross-coupling zeros, but since the same rf parameters of the zeros will result in some simulation points being identical, two cross-coupling zeros are shown in the simulation. The suppression of the emission filtering branch 12 at the frequency of 587.0MHz (m1) is-83.618 dB, the suppression of the frequency point 607.0MHz (m2) is-36.346 dB, the suppression of the frequency point 612.0MHz (m3) is-12.993 dB, and the suppression of the frequency point 663.0MHz (m4) is-114.512 dB. The design requirements for out-of-band rejection of the transmit filter branch 12 can thus be met.
The filter 10 of the first embodiment is a 10-order microwave filter applied to a 5G mobile communication system, and has the characteristics of 617-652 MHz of 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 10-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, low cost, and good structural and electrical performance stability.
Referring to fig. 6 and 7, fig. 6 is a schematic structural diagram of a second embodiment of the filter of the present application, and fig. 7 is a schematic topological structural diagram of the filter of fig. 6. The filter 10 includes a receiving filter branch 13 disposed on the housing 11, and is composed of nine receiving filter cavities coupled in sequence.
Specifically, the nine receiving filter cavities of the receiving filter branch 13 include a first receiving filter cavity B1, a second receiving filter cavity B2, a third receiving filter cavity B3, a fourth receiving filter cavity B4, a fifth receiving filter cavity B5, a sixth receiving filter cavity B6, a seventh receiving filter cavity B7, an eighth receiving filter cavity B8, and a ninth receiving filter cavity B9.
Capacitive cross coupling is respectively carried out between the second receiving filtering cavity B2 and the fifth receiving filtering cavity B5, between the third receiving filtering cavity B3 and the fifth receiving filtering cavity B5, between the sixth receiving filtering cavity B6 and between the eighth receiving filtering cavity B8 of the receiving filtering branch 13, wherein the bandwidth range of the receiving filtering branch 13 is 663MHz-698 MHz.
In particular, as shown in fig. 7, the second embodiment capacitively cross-couples between the second receiving filter cavity B2 and the fifth receiving filter cavity B4 of the receiving filter branch 13 to form a capacitive cross-coupling zero C1A sixth receiving filter cavity B6 and an eighth receiving filter cavity B8 are capacitively cross-coupled to form a capacitive cross-coupling zero C2And a third receiving filter chamber B3 andthe fifth receiving filter cavities B5 are inductively coupled to form inductive cross-coupling zero points L4. Windows are respectively arranged between the third receiving filter cavity B3 and the fifth receiving filter cavity B5, and inductive cross coupling can be realized through the windows to form three cross coupling zeros of the receiving filter branch circuit 13.
It can be seen that, capacitive cross coupling is respectively formed between the second receiving filter cavity B2 and the fifth receiving filter cavity B4, and between the sixth receiving filter cavity B6 and the eighth receiving filter cavity B8 of the receiving filter branch 13, so as to form two capacitive cross coupling zeros, which can well control the low-end rejection of the bandwidth of the receiving filter branch 13, and inductive cross coupling is formed between the third receiving filter cavity B3 and the fifth receiving filter cavity B5, so as to well control the high-end rejection of the bandwidth of the receiving filter branch 13, thereby improving the stop-band rejection performance of the filter 10; in addition, the bandwidth range of the receiving filtering branch circuit 13 is 663MHz-698MHz, and the bandwidth of the receiving filtering branch circuit 13 can be accurately controlled.
Optionally, the receiving filter branch 13 is divided into three columns arranged along the first direction x; the fourth receiving filter cavity B4 and the seventh receiving filter cavity B7 of the receiving filter branch 13 are in a row and are sequentially arranged along the first direction x; the third receiving filter cavity B3, the fifth receiving filter cavity B5, the sixth receiving filter cavity B6 and the eighth receiving filter cavity B8 of the receiving filter branch 13 are in a row and are sequentially arranged along the first direction x; the first receiving filter cavity B1, the second receiving filter cavity B2 and the ninth receiving filter cavity B9 of the receiving filter branch 13 are in a row and are sequentially arranged along the first direction x.
Nine receiving filter cavities of the receiving filter branch 13 are divided into three rows arranged in sequence along the first direction x, and the nine receiving filter cavities are regularly arranged, so that the volume of the receiving filter branch 13 is reduced, and further, the volume of the filter 10 is reduced.
Optionally, nine receiving filter cavities of the receiving filter branch 13 are sequentially window-coupled, that is, a first receiving filter cavity B1 and a second receiving filter cavity B2 are window-coupled, a second receiving filter cavity B2 and a third receiving filter cavity B3 are window-coupled, a third receiving filter cavity B3 and a fourth receiving filter cavity B4 are window-coupled, a fourth receiving filter cavity B4 and a fifth receiving filter cavity B5 are window-coupled, a fifth receiving filter cavity B5 and a sixth receiving filter cavity B6 are window-coupled, a sixth receiving filter cavity B6 and a seventh receiving filter cavity B7 are window-coupled, a seventh receiving filter cavity B7 and an eighth receiving filter cavity B8 are window-coupled, and an eighth receiving filter cavity B8 and a ninth receiving filter cavity B9 are window-coupled. In addition, second metal coupling ribs 81 are respectively provided between the first receiving filter cavity B1 and the second receiving filter cavity B2, between the second receiving filter cavity B2 and the third receiving filter cavity B3, between the third receiving filter cavity B3 and the fourth receiving filter cavity B4, between the fourth receiving filter cavity B4 and the fifth receiving filter cavity B5, between the fifth receiving filter cavity B5 and the sixth receiving filter cavity B6, between the sixth receiving filter cavity B6 and the seventh receiving filter cavity B7, between the seventh receiving filter cavity B7 and the eighth receiving filter cavity B8, and between the eighth receiving filter cavity B8 and the ninth receiving filter cavity B9.
The two adjacent filter cavities on the coupling path of the receiving filter branch 13 are coupled by pure windows, so that the cost of the filter 10 is reduced, and the coupling strength between the two adjacent filter cavities on the coupling path of the receiving filter branch 13 can be improved by the second metal coupling rib 81.
Each receiving filter cavity is provided with a second mounting post, a second resonant rod 21 and a second tuning rod 31; a second resonant rod 21 including a second U-shaped sidewall and a second hollow cavity formed by the second U-shaped sidewall; a second tuning rod 31, one end of the second tuning rod 31 is arranged in the second hollow inner cavity; the two ends of the second U-shaped side wall bend and extend in the direction departing from the second hollow inner cavity so as to form second disc-shaped structures at the two ends of the second U-shaped side wall, and the second disc-shaped structures are arranged in parallel with the bottom of the second U-shaped side wall; the second U-shaped side wall is fixed to the second mounting post.
The schematic structural diagram of the combined structure of the second tuning rod 31, the second resonant rod 21 and the second mounting post of the receiving filtering branch 13 is similar to the schematic structural diagram of the combined structure of the first tuning rod 30, the first resonant rod 20 and the first mounting post 40 of the transmitting filtering branch 12, as shown in fig. 3, and is not repeated herein.
Thus, the second resonant rod 21 is fixed to the housing 11 by the second mounting post, and the resonant frequency of the second resonant cavity can be adjusted by adjusting the depth of the second tuning rod 31 within the second hollow cavity.
The ten receiving filter cavities of the receiving filter branch circuit 13 have the same size, so that the production is convenient, and the cost is saved. The ten receiving filter cavities may have a radius of less than 21mm, e.g. 20mm, 19mm, 18mm, etc.
Optionally, referring to fig. 8, fig. 8 is a schematic structural diagram of a combination structure of a flying rod and a supporting clamping seat in the filter of fig. 6. Flying rods 60 are respectively arranged between the second receiving filter cavity B2 and the fifth receiving filter cavity B5, between the third receiving filter cavity B3 and the fifth receiving filter cavity B5, between the sixth receiving filter cavity B6 and the eighth receiving filter cavity B8 of the receiving filter branch 13, so that the second receiving filter cavity B2 and the fifth receiving filter cavity B5, between the third receiving filter cavity B3 and the fifth receiving filter cavity B5, between the sixth receiving filter cavity B6 and the eighth receiving filter cavity B8 are respectively in capacitive cross coupling; the flying bar 60 is arranged in a sheet shape, has a simple structure and is convenient to process and manufacture.
Specifically, the flying bar 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 with the first coupling portion 620 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 connecting part 630 and the second coupling part 620 are connected in sequence to form a U-shaped fly rod 60; the first coupling part 610 is coupled to the first resonance rod 20 in the second receiving filter cavity B2 to form a coupling capacitance 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 fifth receiving filter cavity B5 to form a coupling capacitance between the second coupling part 620 and the resonance rod 20.
Similarly, the structure and the specific connection mode of the flying rod arranged between the third receiving filter cavity B3 and the fifth receiving filter cavity B5, and between the sixth receiving filter cavity B6 and the eighth receiving filter cavity B8 are similar to those of the flying rod 60 arranged between the second receiving filter cavity B2 and the fifth receiving filter cavity B5, and are not described herein again.
As shown in fig. 8, the filter 10 further includes: 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 connecting portion 630 penetrates through the through hole to fix the flying bar 60 on the support socket 70.
The flying bar 60 of the present embodiment can be implemented by a metal probe, and the support holder 70 is implemented by PTFE or engineering plastic.
The equivalent circuit of the second embodiment filter 10 is shown in fig. 9, with an impedance Z3 at the input port of about 50 ohms and an impedance Z4 at the output port of about 50 ohms; in order to ensure that electromagnetic signals are transmitted between the nine receiving filter cavities of the receiving filter branch 13, impedance adjusters ZV2 are respectively disposed between the input port and the first receiving filter cavity B1, between adjacent filter cavities on the coupling path, between non-cascaded filter cavities forming cross coupling, and between the ninth receiving filter cavity B9 and the output port, so as to implement impedance matching.
The bandwidth range of the receiving filtering branch 13 of the filter 10 of the present embodiment is: 663MHz-698 MHz. Specifically, the coupling bandwidth between the first port and the first receiving filter cavity B1 ranges from 34Mhz to 42 Mhz; the coupling bandwidth between the first receiving filter cavity B1 and the second receiving filter cavity B2 ranges from 27Mhz to 34 Mhz; the coupling bandwidth between the second receiving filter cavity B2 and the third receiving filter cavity B3 ranges from 18Mhz to 25 Mhz; the coupling bandwidth between the second receiving filter cavity B2 and the fifth receiving filter cavity B5 ranges from (-4.6) Mhz- (-0.3) Mhz; the coupling bandwidth between the third receiving filter cavity B3 and the fourth receiving filter cavity B4 ranges from 19Mhz to 25 Mhz; the coupling bandwidth between the third receiving filter cavity B3 and the fifth receiving filter cavity B5 ranges from (-3.4) Mhz-1 Mhz; the coupling bandwidth between the fourth receiving filter cavity B4 and the fifth receiving filter cavity B5 ranges from 16Mhz to 22 Mhz; the coupling bandwidth between the fifth receiving filter cavity B5 and the sixth receiving filter cavity B6 ranges from 17Mhz to 23 Mhz; the coupling bandwidth between the sixth receiving filter cavity B6 and the seventh receiving filter cavity B7 ranges from 15Mhz to 21 Mhz; the coupling bandwidth between the sixth receiving filter cavity B6 and the eighth receiving filter cavity B8 ranges from (-12) Mhz- (-7.1) Mhz; the coupling bandwidth between the seventh receiving filter cavity B7 and the eighth receiving filter cavity B8 ranges from 16Mhz to 22 Mhz; the coupling bandwidth between the eighth receiving filter cavity B8 and the ninth receiving filter cavity B9 ranges from 27Mhz to 34 Mhz; the coupling bandwidth between the ninth receiving filter cavity B9 and the second port is in the range of 34Mhz-42Mhz, which can meet the design requirement.
Therefore, the resonant frequencies of the first receiving filter cavity B1 through the ninth receiving filter cavity B9 of the filter 10 are sequentially located in the following ranges: 679Mhz-681Mhz, 677Mhz-679Mhz, 679Mhz-681Mhz, 670Mhz-672Mhz, 679Mhz-681 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 second embodiment is shown in fig. 10, and it can be known from fig. 10 that the bandwidth of the receiving filtering branch 13 of the filter 10 of this embodiment is about 663MHz-698 MHz; as shown in the frequency band curve S2, there are two low-end coupling zeros c, d and one high-end coupling zero e. The suppression of the frequency point 652.5MHz (m1) is-85.800 dB, the suppression of the frequency point 708.0MHz (m2) is-44.548 dB, and the suppression of the frequency point 716.5MHz (m3) is-84.538 dB, so that the receiving and filtering branch 13 can meet the design requirement of out-of-band suppression.
The working frequency band of the receiving filter branch circuit 13 of the second embodiment is 663MHz-698MHz, and the receiving filter branch circuit has the characteristics of strong anti-interference capability, small overall size and light weight.
Referring to fig. 11, fig. 11 is a schematic diagram of an equivalent circuit structure of a filter according to a third embodiment. The third embodiment filter 10 comprises a transmit filtering branch 12 of the first embodiment, a receive filtering branch 13 of the second embodiment, a first port, a second port and a third port.
As shown in fig. 5 and 10, the suppression of the frequency point 663.0MHz (m4) of the transmitting filtering branch 12 is-114.512 dB, which is located in the bandwidth range of 663MHz-698MHz of the receiving filtering branch 13, that is, the cross-coupling zero point of the transmitting filtering branch 12 meets the design requirement of the filter 10 for out-of-band suppression, and the anti-interference capability is strong, so that the isolation between the transmitting filtering branch 12 and the receiving filtering branch 13 can be improved.
Optionally, the first port is respectively connected with the first receiving filter cavity B1 of the receiving filter branch 13 and the first transmitting filter cavity a1 of the transmitting filter branch 12; the second port is connected with a tenth emission filter cavity a10 of the emission filter branch circuit 12; the third port is connected to the ninth receiving filter cavity B9 of the receiving filter branch 13. The transmitting filter branch 12 and the receiving filter branch 13 share the first port, so that the cost can be saved, and the size of the filter 10 can be reduced.
The present application further provides a communication device, as shown in fig. 12, fig. 12 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;
and the transmitting and filtering branch is arranged on the shell and consists of ten transmitting and filtering cavities which are sequentially coupled, a third transmitting and filtering cavity and a fifth transmitting and filtering cavity of the transmitting and filtering branch, a sixth transmitting and filtering cavity and an eighth transmitting and filtering cavity of the transmitting and filtering branch, and an eighth transmitting and filtering cavity and a tenth transmitting and filtering cavity of the transmitting and filtering branch are respectively in inductive cross coupling, wherein the bandwidth range of the transmitting and filtering branch is 617-652 MHz.
2. The filter of claim 1, wherein the ten transmit wave cavities of the transmit filter branch are divided into six columns arranged along the second direction;
the seventh emission filter cavity and the tenth emission filter cavity of the emission filter branch are in a row and are sequentially arranged along the second direction;
the sixth emission filtering cavity, the eighth emission filtering cavity and the ninth emission filtering cavity of the emission filtering branch are in a row and are sequentially arranged along the second direction;
the fifth emission filtering cavities of the emission filtering branch are in a row and are sequentially arranged along the second direction;
a fourth emission filtering cavity and a third emission filtering cavity of the emission filtering branch are in a row and are arranged along the second direction, wherein the third emission filtering cavity is close to a midline of the shell in the second direction relative to the fourth emission filtering cavity;
the second emission filtering cavities of the emission filtering branch are in a row and are sequentially arranged along the second direction;
the first emission filtering cavities of the emission filtering branches are in a row and are sequentially arranged along the second direction.
3. The filter of claim 2, wherein the first emission filter cavity, the second emission filter cavity, the third emission filter cavity and the ninth emission filter cavity of the emission filter branch are arranged in a straight line;
a fourth emission filtering cavity, a fifth emission filtering cavity, an eighth emission filtering cavity and a tenth emission filtering cavity of the emission filtering branch are arranged in a straight line;
and the sixth emission filtering cavity and the seventh emission filtering cavity of the emission filtering branch are arranged in a straight line.
4. The filter according to claim 3, wherein ten emission filter cavities of the emission filter branch are sequentially window-coupled, and first metal coupling ribs are respectively disposed between a first emission filter cavity and a second emission filter cavity, between the second emission filter cavity and a third emission filter cavity, between the third emission filter cavity and a fourth emission filter cavity, between a fifth emission filter cavity and a sixth emission filter cavity, between a seventh emission filter cavity and an eighth emission filter cavity, between the eighth emission filter cavity and a ninth emission filter cavity, and between the ninth emission filter cavity and the tenth emission filter cavity of the emission filter branch.
5. The filter of claim 4, wherein each of the launch filter cavities is provided with a first mounting post, a first resonating rod, and a first tuning rod;
the first resonance rod comprises a first U-shaped side wall and a first hollow inner cavity formed by the first U-shaped side wall;
the first tuning rod, one end of the first tuning rod is arranged in the first hollow inner cavity;
the two ends of the first U-shaped side wall bend and extend in a direction departing from the first hollow inner cavity so as to form first disc-shaped structures at the two ends of the first U-shaped side wall, and the first disc-shaped structures are arranged in parallel with the bottom of the first U-shaped side wall; the first U-shaped side wall is fixed to the first mounting post.
6. The filter of any one of claims 1-5, further comprising:
and the receiving and filtering branch is arranged on the shell and consists of ten receiving and filtering cavities which are sequentially coupled, the second receiving and filtering cavity and the fifth receiving and filtering cavity of the receiving and filtering branch, the third receiving and filtering cavity and the fifth receiving and filtering cavity, and the sixth receiving and filtering cavity and the eighth receiving and filtering cavity of the receiving and filtering branch are respectively in capacitive cross coupling, and the bandwidth range of the receiving and filtering branch is 663MHz-698 MHz.
7. The filter of claim 6,
the receiving filter branches are divided into three rows arranged along the first direction;
the fourth receiving filter cavity and the seventh receiving filter cavity of the receiving filter branch are in a row and are sequentially arranged along the first direction;
the third receiving filter cavity, the fifth receiving filter cavity, the sixth receiving filter cavity and the eighth receiving filter cavity of the receiving filter branch are in a row and are sequentially arranged along the first direction;
the first receiving filter cavity, the second receiving filter cavity and the ninth receiving filter cavity of the receiving filter branch are in a row and are sequentially arranged along the first direction.
8. The filter according to claim 5, wherein nine receiving filter cavities of the receiving filter branch are sequentially window-coupled, and second metal coupling ribs are respectively disposed between a first receiving filter cavity and a second receiving filter cavity, between the second receiving filter cavity and a third receiving filter cavity, between the third receiving filter cavity and a fourth receiving filter cavity, between the fourth receiving filter cavity and a fifth receiving filter cavity, between the fifth receiving filter cavity and a sixth receiving filter cavity, between the sixth receiving filter cavity and a seventh receiving filter cavity, between the seventh receiving filter cavity and an eighth receiving filter cavity, and between the eighth receiving filter cavity and the ninth receiving filter cavity of the receiving filter branch;
each receiving filter cavity is provided with a second mounting column, a second resonance rod and a second tuning rod; the second resonance rod comprises a second U-shaped side wall and a second hollow inner cavity formed by the second U-shaped side wall;
the second tuning rod, one end of the second tuning rod is arranged in the second hollow inner cavity;
the two ends of the second U-shaped side wall bend and extend in the direction departing from the second hollow inner cavity so as to form second disc-shaped structures at the two ends of the second U-shaped side wall, and the second disc-shaped structures are arranged in parallel with the bottom of the second U-shaped side wall; the second U-shaped side wall is fixed on the second mounting column;
flying rods are respectively arranged between the second receiving filter cavity and the fifth receiving filter cavity of the receiving filter branch circuit, between the third receiving filter cavity and the fifth receiving filter cavity, and between the sixth receiving filter cavity and the eighth receiving filter cavity; the flying rod is arranged in a sheet shape and comprises a first coupling part, a second coupling part and a connecting part, and two ends of the connecting part are respectively connected with the first coupling part and the second coupling part.
9. The filter of claim 7,
the filter further comprises:
the first port is connected with the first receiving filter cavity of the receiving filter branch circuit and the first transmitting filter cavity of the transmitting filter branch circuit;
the second port is connected with a tenth transmitting and filtering cavity of the transmitting and filtering branch circuit;
and the third port is connected with the ninth receiving filter cavity of the receiving filter 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 |
|---|---|---|---|
| CN202010351808.XA CN113571855A (en) | 2020-04-28 | 2020-04-28 | Filter and communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010351808.XA CN113571855A (en) | 2020-04-28 | 2020-04-28 | Filter and communication equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113571855A true CN113571855A (en) | 2021-10-29 |
Family
ID=78158269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010351808.XA Pending CN113571855A (en) | 2020-04-28 | 2020-04-28 | Filter and communication equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113571855A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120299667A1 (en) * | 2011-05-25 | 2012-11-29 | Hsu Wei-Hong | Cavity filter having feedback arrangement |
| CN209232915U (en) * | 2018-12-21 | 2019-08-09 | 深圳市大富科技股份有限公司 | Duplexer and communication radio frequency device |
| CN209691912U (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 |
| 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 |
-
2020
- 2020-04-28 CN CN202010351808.XA patent/CN113571855A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120299667A1 (en) * | 2011-05-25 | 2012-11-29 | Hsu Wei-Hong | Cavity filter having feedback arrangement |
| CN209232915U (en) * | 2018-12-21 | 2019-08-09 | 深圳市大富科技股份有限公司 | Duplexer and communication radio frequency device |
| CN209691912U (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 |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2000031706A (en) | Band-pass filter provided with dielectric resonator | |
| CN216354692U (en) | Filter and communication device | |
| CN212323176U (en) | Filter and communication equipment | |
| CN113571855A (en) | Filter and communication equipment | |
| CN113540721B (en) | Filter and communication equipment | |
| CN212323178U (en) | Filter and communication equipment | |
| CN212571291U (en) | Filter and communication equipment | |
| CN113571853A (en) | Filter and communication equipment | |
| CN212323177U (en) | Filter and communication equipment | |
| CN113497316B (en) | Filter and communication equipment | |
| CN113497315B (en) | Filter and communication equipment | |
| CN212323179U (en) | Filter and communication equipment | |
| CN113497317B (en) | Filter and communication equipment | |
| CN113675565A (en) | Filter and communication equipment | |
| CN113571854A (en) | Filter and communication equipment | |
| CN113540719A (en) | Filter and communication equipment | |
| CN113675567A (en) | Filter and communication equipment | |
| CN113540720A (en) | Filter and communication equipment | |
| CN113571857A (en) | Filter and communication equipment | |
| CN212571293U (en) | Filter and communication equipment | |
| CN113540718A (en) | Filter and communication equipment | |
| CN113629369A (en) | Filter and communication equipment | |
| CN113571856A (en) | Filter and communication equipment | |
| CN113725577A (en) | Filter and communication equipment | |
| CN113675564A (en) | Filter and communication equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211029 |