CN111033886A - Cross coupling structure and cavity filter - Google Patents
Cross coupling structure and cavity filter Download PDFInfo
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- CN111033886A CN111033886A CN201880041255.9A CN201880041255A CN111033886A CN 111033886 A CN111033886 A CN 111033886A CN 201880041255 A CN201880041255 A CN 201880041255A CN 111033886 A CN111033886 A CN 111033886A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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Abstract
A cross-coupling structure (20) and a cavity filter (100), wherein the cavity filter (100) comprises a filter cavity (10), the filter cavity (10) comprises a first resonant cavity (11), a second resonant cavity (12) and a third resonant cavity (13), a channel (17) is formed between the first resonant cavity (11) and the second resonant cavity (12) and is oppositely arranged, and the third resonant cavity (13) is communicated with the channel (17); the cross-coupling structure (20) comprises a connecting line (21), a tap (22), a first open-circuit piece (23) and a second open-circuit piece (24); the connecting wire (21) is accommodated in the channel (17) and extends to the third resonant cavity (13); a tap (22) is arranged in the third resonant cavity (13) and is connected with the end part of the connecting wire (21); the first resonant cavity (11) is provided with a first window (111), and the first open circuit piece (23) is connected with the connecting line (21) and extends into the first resonant cavity (11) through the first window (111); the second resonant cavity (12) is provided with a second window (121), and the second open circuit piece (24) is connected with the connecting line (21) and extends into the second resonant cavity (12) through the second window (121). The cavity filter (100) can meet the specified electrical performance requirement of the cavity filter under the condition of small volume.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of communication radio frequency, in particular to a cross-coupling structure and a cavity filter.
[ background of the invention ]
With the rapid development of mobile communication, the demand of cavity radio frequency devices such as filters, duplexers, combiners and the like is increasing, and meanwhile, the requirements on the quality and the performance of the cavity radio frequency devices are higher. In consideration of the situations of limited spectrum resources, power saving and the like, radio frequency devices are required to have small insertion loss, large out-of-band rejection and small size, and the requirements of electrical performance indexes are required to be met in a cross-coupling mode under most situations.
The cross coupling capacity and the inductance of the existing radio frequency device are two types, the cross coupling quantity of the existing radio frequency device corresponds to the cavity structure, and after the coupling quantity is determined, the corresponding internal structure is also determined. In order to improve the electrical performance of the filter, a capacitor structure and an inductor structure are usually loaded between the resonators, wherein the capacitor structure please refer to fig. 1, a window 230 is opened between the two resonators 210 and 220, a fixed dielectric material 240 is disposed at the window 230, the dielectric material 240 is opened with a notch (not shown) through, and the metal coupling rod 250 is clamped into the notch and fixed to realize the capacitor structure.
In long-term research, the inventor of the present application finds that, under the condition of fixing the structure, the input end and the output end of the cavity filter, the traditional mode of loading the capacitor structure and the inductor structure cannot enable the cavity filter to generate 3 transmission zeros at the low end, and thus the electrical performance index cannot be met.
[ summary of the invention ]
The invention provides a cross-coupling structure and a cavity filter, and aims to solve the technical problem that in the prior art, under the condition of fixing the structure, the input end and the output end of the cavity filter, the traditional mode of loading a capacitor structure and an inductor structure cannot enable the cavity filter to generate 3 transmission zeros at the low end, and thus the electrical performance index cannot be met.
In order to solve the technical problems, one technical scheme of the invention is as follows: providing a cross-coupling structure, applying to a cavity filter, wherein the cavity filter comprises a filter cavity, the filter cavity comprises a first resonant cavity, a second resonant cavity and a third resonant cavity, a channel is arranged between the first resonant cavity and the second resonant cavity and is oppositely arranged, and the third resonant cavity is communicated with the channel;
the cross-coupling structure comprises a connecting line, a tap, a first open circuit chip and a second open circuit chip;
the connecting wire is accommodated in the channel and extends to the third resonant cavity;
the tap is arranged in the third resonant cavity and is connected with the end part of the connecting wire;
a first window is arranged on the first resonant cavity close to the first isolation rib of the channel, and the first open circuit piece is connected with the connecting wire and extends into the first resonant cavity through the first window;
and a second window is arranged on a second isolation rib of the second resonant cavity close to the channel, and the second open circuit piece is connected with the connecting wire and extends into the second resonant cavity through the second window.
In order to solve the above technical problems, another technical solution of the present invention is: there is provided a cavity filter comprising:
the filter cavity comprises a first resonant cavity, a second resonant cavity and a third resonant cavity, a channel is arranged between the first resonant cavity and the second resonant cavity and is oppositely arranged, and the third resonant cavity is communicated with the channel;
the first cross coupling structure comprises a connecting line, a tap, a first open circuit chip and a second open circuit chip;
the connecting wire is accommodated in the channel and extends to the third resonant cavity;
the tap is arranged in the third resonant cavity and is connected with the end part of the connecting wire;
a first window is arranged on the first resonant cavity close to the first isolation rib of the channel, and the first open circuit piece is connected with the connecting wire and extends into the first resonant cavity through the first window;
and a second window is arranged on a second isolation rib of the second resonant cavity close to the channel, and the second open circuit piece is connected with the connecting wire and extends into the second resonant cavity through the second window.
Different from the situation of the prior art, the cross-coupling structure provided by the invention has the advantages that the first open-circuit piece, the second open-circuit piece and the tap are connected through the connecting wires and respectively extend to the first resonant cavity, the second resonant cavity and the third resonant cavity of the filter, so that two transmission zero points are generated at the low end, the specified electrical performance requirement of the cavity filter can be met under the condition of limiting the structure, the input end and the output end of the cavity filter, the size of the cavity of the filter is small, the structure is simple, the assembly is easy, the out-of-band rejection requirement can be realized, and the cost is effectively reduced.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic diagram of a structure of an embodiment of a filter cavity in the prior art;
fig. 2 is a schematic top view of a filter cavity in a cavity filter according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another angle of the filter cavity shown in FIG. 2;
FIG. 4 is an exploded schematic view of the filter cavity shown in FIG. 3;
FIG. 5 is a simulated circuit diagram of the cavity filter shown in FIG. 2;
fig. 6 is a graph of the response of the cavity filter shown in fig. 2.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 2, fig. 3 and fig. 4, a cavity filter 100 according to an embodiment of the present invention includes a filter cavity 10, a first cross-coupling structure 20, a second cross-coupling structure 30, a first coupling screw 40, a second coupling screw 50, a plurality of resonators 60 and a plurality of resonant rods 70, where the filter cavity 10 includes a first resonant cavity 11, a second resonant cavity 12, a third resonant cavity 13, a fourth resonant cavity 14, a fifth resonant cavity 15 and a plurality of isolation ribs, and the plurality of isolation ribs includes a first isolation rib 161, a second isolation rib 162 and a third isolation rib 163.
A channel 17 is formed between the first resonant cavity 11 and the second resonant cavity 12, and the third resonant cavity 13 is communicated with the channel 17. In this embodiment, the first resonant cavity 11, the second resonant cavity 12, and the third resonant cavity 13 are arranged in a triangular line.
The first cross-coupling structure 20 includes a connection line 21, a tap 22, a first open tab 23, a second open tab 24, and a fixing member 25.
The connecting line 21 is accommodated in the passage 17 and extends to the third resonant cavity 13. In the present embodiment, the connecting wire 21 is in the form of a sheet and is placed in the channel 17 in an upright manner, and further, the connecting wire 21 is in the form of an "L". Of course, in other embodiments, the shape and arrangement of the connecting line 21 may be adjusted according to the requirement, and is not limited herein.
A tap 22 is arranged in the third cavity 13 and is connected to the end of the connection line 21. In the present embodiment, the tap 22 is provided on the top side of the connection line 21.
The first isolation rib 161 of the first resonant cavity 11 near the channel 17 is provided with a first window 111, and the first open-circuit piece 23 is connected to the connection line 21 and extends into the first resonant cavity 11 through the first window 111.
The second cavity 12 is provided with a second window 121 near the second isolation rib 162 of the channel 17, and the second open-circuit piece 24 is connected to the connection line 21 and extends into the second cavity 12 through the second window 121.
Referring to fig. 4, the fixing member 25 is used to fix the connecting wire 21 in the channel 17. In this embodiment, the fixing member 25 has a groove 251, the fixing member 25 covers the connecting wire 21, and the connecting wire 21 is embedded in the groove 251. The width of the fixing member 25 is equal to the width of the channel 17, so that the fixing member 25 is fixedly disposed in the channel 17, thereby fixing the connection line 21 in the channel 17. Further, the groove 251 is a "U" shaped groove.
In the present embodiment, the connection line 21, the tap 22, the first open piece 23, and the second open piece 24 are integrally molded. The first open tab 23 and the second open tab 24 may be L-shaped. Of course, in other embodiments, the first open piece 23 and the second open piece 24 may have other shapes, and are not limited herein.
It is understood that the length, width and height of the first open-circuit piece 23 and the second open-circuit piece 24 affect the coupling amount, and therefore, the length and width of the first open-circuit piece 23 and the second open-circuit piece 24 can be adjusted according to the coupling strength, which is not limited herein.
It will be appreciated that the first cross-coupling structure 20 connects the first open tab 23, the second open tab 24 and the tap 22 by the connecting wires 21 and extends to the first resonator 11, the second resonator 12 and the third resonator 13 of the filter cavity 10, respectively, so as to generate two transmission zeros at the lower end, which can satisfy the specified electrical performance requirements of the cavity filter 100 with respect to the locations of the structure, input and output ends of the cavity filter 100 being defined.
The fourth resonant cavity 14 is isolated from the third resonant cavity 13 by a third isolation rib 163, and the second cross-coupling structure 30 is fixedly disposed on the third isolation rib 163.
Specifically, the second cross-coupling structure 30 includes an installation component 31 and a cross-coupling structural component 32, a through hole (not shown) is formed in the installation component 31, the cross-coupling structural component 32 passes through the through hole and is fixed to the installation component 31, a notch 141 is formed in the third isolation rib 163, and the installation component 31 is fixedly disposed at the notch 141, so that the second cross-coupling structure 30 is fixedly disposed on the third isolation rib 163.
Optionally, the fifth resonant cavity 15 is disposed between the first resonant cavity 11 and the fourth resonant cavity 14, and is disposed adjacent to the third resonant cavity 13. In this embodiment, the first resonant cavity 11, the fifth resonant cavity 15 and the fourth resonant cavity 14 are sequentially arranged, the second resonant cavity 12 and the third resonant cavity 13 are sequentially arranged, and the third resonant cavity 13 and the fifth resonant cavity 15 are concentric. Of course, in other embodiments, the arrangement of the first resonant cavity 11, the second resonant cavity 12, the third resonant cavity 13, the fourth resonant cavity 14, and the fifth resonant cavity 15 may be adaptively adjusted according to requirements, and is not limited herein.
A first coupling window 151 is formed between the fifth resonant cavity 15 and the third resonant cavity 13, and the first coupling screw 40 is arranged in the first coupling window 151; a second coupling window 152 is disposed between the fifth resonant cavity 15 and the fourth resonant cavity 14, and the second coupling screw 50 is disposed in the second coupling window 152.
The resonators 60 are respectively disposed in the first resonant cavity 11, the second resonant cavity 12, the third resonant cavity 13, the fourth resonant cavity 14, and the fifth resonant cavity 15, and the resonant rods 70 are respectively disposed on the resonators 60 in the corresponding resonant cavities.
Optionally, a boss 80 is disposed in each resonant cavity, and the plurality of resonators 60 are disposed on the boss 80 in the corresponding resonant cavity. Wherein the boss 80 may be integrally formed with the filter cavity 10.
Further, referring to fig. 5, the filter cavity 10 includes an input end 91 and an output end 92, the input end 91 is located at an end of the connecting line 21, and the output end 92 is disposed on a sidewall of the fourth resonant cavity 14 away from the fifth resonant cavity 15.
Referring to fig. 6, fig. 6 is a response curve diagram of the cavity filter 100 according to the embodiment of the present invention. As can be seen from the figure, in the case of fixing the structure of the cavity filter 100, the positions of the input end 91 and the output end 92, the cavity filter 100 provided by the embodiment of the present invention can generate 3 transmission zeros at the low end, where m3 refers to the transmission zero generated by the first cross-coupling structure 20, and m4 refers to the transmission zero generated by the second cross-coupling structure 30.
Different from the prior art, the first cross-coupling structure 20 in the cavity filter 100 according to the embodiment of the present invention connects the first open tab 23, the second open tab 24, and the tap 22 through the connection line 21, and extends to the first resonant cavity 11, the second resonant cavity 12, and the third resonant cavity 13 of the filter cavity 10, respectively, so as to generate two transmission zeros at the low end, and under the condition that the positions of the structure, the input end 91, and the output end 92 of the cavity filter 100 are limited, the specified electrical performance requirement of the cavity filter 100 can be satisfied, and the filter cavity 10 has a small volume, a simple structure, and is easy to assemble, and can achieve a high out-of-band rejection requirement, thereby effectively reducing the cost.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications made by the equivalent structures or equivalent processes, or directly or indirectly applied to other related technical fields, which are made by the contents of the present specification and the accompanying drawings, are included in the scope of the present invention.
Claims (15)
- A cross coupling structure is applied to a cavity filter, and is characterized in that the cavity filter comprises a filter cavity, the filter cavity comprises a first resonant cavity, a second resonant cavity and a third resonant cavity, a channel is arranged between the first resonant cavity and the second resonant cavity and is oppositely arranged, and the third resonant cavity is communicated with the channel;the cross-coupling structure comprises a connecting line, a tap, a first open circuit chip and a second open circuit chip;the connecting wire is accommodated in the channel and extends to the third resonant cavity;the tap is arranged in the third resonant cavity and is connected with the end part of the connecting wire;a first window is arranged on the first resonant cavity close to the first isolation rib of the channel, and the first open circuit piece is connected with the connecting wire and extends into the first resonant cavity through the first window;and a second window is arranged on a second isolation rib of the second resonant cavity close to the channel, and the second open circuit piece is connected with the connecting wire and extends into the second resonant cavity through the second window.
- The cross-coupling structure of claim 1, further comprising a fastener for securing the connecting wire within the channel.
- The cross-coupling structure of claim 2, wherein the fixing member has a groove, the fixing member is covered on the connecting wire, and the connecting wire is embedded in the groove.
- The cross-coupling structure of claim 1, wherein the connecting line, the tap, the first open tab, and the second open tab are integrally formed.
- The cross-coupling structure of claim 1, wherein the first open-circuited conducting strip and the second open-circuited conducting strip are both "L" -shaped.
- A cavity filter, comprising:the filter cavity comprises a first resonant cavity, a second resonant cavity and a third resonant cavity, a channel is arranged between the first resonant cavity and the second resonant cavity and is oppositely arranged, and the third resonant cavity is communicated with the channel;the first cross coupling structure comprises a connecting line, a tap, a first open circuit chip and a second open circuit chip;the connecting wire is accommodated in the channel and extends to the third resonant cavity;the tap is arranged in the third resonant cavity and is connected with the end part of the connecting wire;a first window is arranged on the first resonant cavity close to the first isolation rib of the channel, and the first open circuit piece is connected with the connecting wire and extends into the first resonant cavity through the first window;and a second window is arranged on a second isolation rib of the second resonant cavity close to the channel, and the second open circuit piece is connected with the connecting wire and extends into the second resonant cavity through the second window.
- The cavity filter of claim 6, wherein the first cross-coupling structure further comprises a fastener for fastening the connection line within the channel.
- The cavity filter of claim 7, wherein the fixing member has a groove, the fixing member is covered on the connecting wire, and the connecting wire is embedded in the groove.
- The cavity filter of claim 6, wherein the connecting wires, the taps, the first open tab, and the second open tab are integrally formed.
- The cavity filter of claim 6, wherein the first open-circuit piece and the second open-circuit piece are both "L" shaped.
- The cavity filter of claim 6, wherein the cavity filter further comprises a second cross-coupling structure, the filter cavity further comprises a fourth resonant cavity, the fourth resonant cavity is isolated from the third resonant cavity by a third isolation rib, and the second cross-coupling structure is fixedly disposed on the third isolation rib.
- The cavity filter of claim 11, wherein the second cross-coupling structure comprises a mounting member and a cross-coupling structural member, the mounting member defines a through hole, and the cross-coupling structural member passes through the through hole and is fixed to the mounting member.
- The cavity filter of claim 11, wherein the filter cavity further comprises a fifth resonant cavity, a first coupling screw, and a second coupling screw, the fifth resonant cavity being disposed between the first resonant cavity and the fourth resonant cavity and adjacent to the third resonant cavity;a first coupling window is formed between the fifth resonant cavity and the third resonant cavity, and the first coupling screw is arranged in the first coupling window;a second coupling window is arranged between the fifth resonant cavity and the fourth resonant cavity, and the second coupling screw is arranged in the second coupling window.
- The cavity filter according to claim 13, further comprising a plurality of resonators respectively disposed in the first resonant cavity, the second resonant cavity, the third resonant cavity, the fourth resonant cavity, and the fifth resonant cavity.
- The cavity filter according to claim 14, further comprising a plurality of resonance rods, each of the plurality of resonance rods being disposed on a corresponding one of the resonators.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/096514 WO2020014980A1 (en) | 2018-07-20 | 2018-07-20 | Cross-coupling structure and cavity filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111033886A true CN111033886A (en) | 2020-04-17 |
| CN111033886B CN111033886B (en) | 2021-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880041255.9A Active CN111033886B (en) | 2018-07-20 | 2018-07-20 | Cross coupling structure and cavity filter |
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| Country | Link |
|---|---|
| CN (1) | CN111033886B (en) |
| WO (1) | WO2020014980A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022218113A1 (en) * | 2021-04-16 | 2022-10-20 | 京信射频技术(广州)有限公司 | Metal filter, filtering loop module, and method for adjusting amount of coupling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022218113A1 (en) * | 2021-04-16 | 2022-10-20 | 京信射频技术(广州)有限公司 | Metal filter, filtering loop module, and method for adjusting amount of coupling |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020014980A1 (en) | 2020-01-23 |
| CN111033886B (en) | 2021-06-25 |
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