CN103474730A - Coaxial output filter and design method thereof - Google Patents

Coaxial output filter and design method thereof Download PDF

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Publication number
CN103474730A
CN103474730A CN201310446201XA CN201310446201A CN103474730A CN 103474730 A CN103474730 A CN 103474730A CN 201310446201X A CN201310446201X A CN 201310446201XA CN 201310446201 A CN201310446201 A CN 201310446201A CN 103474730 A CN103474730 A CN 103474730A
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resonant
resonant rod
filter
cavity
port
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CN201310446201XA
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CN103474730B (en
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杨毅民
林浩佳
张能
姜立伟
李秋强
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Xian Institute of Space Radio Technology
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Xian Institute of Space Radio Technology
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Abstract

The invention relates to a coaxial output filter and a design method of the coaxial output filter, and belongs to the technical field of electronics. The coaxial output filter comprises a first resonant cavity (1), a second resonant cavity (2), a third resonant cavity (3), a first resonant bar (4), a second resonant bar (5), a third resonant bar (6), a first coupling window (7), a second coupling window (8), an input tap coupling line (9), an output tap coupling line (10), a resonant bar adjusting gasket (11) and a cover board, wherein the first resonant bar (4) is located in the first resonant cavity (1); the second resonant bar (5) is located in the second resonant cavity (2); the third resonant bar (6) is located in the third resonant cavity (3). By means of a collaborative simulation technology, the length and position of the three resonant bars and the size of partition walls among the three resonant bars are regulated, and the three couplings can achieve required coupling amounts at the same time.

Description

A kind of coaxial output filter and method for designing thereof
Technical field
The present invention relates to a kind of coaxial output filter and method for designing thereof, belong to electronic technology field.
Background technology
Waveguide filter is the critical component of Microwave radio frequency system.Along with the development of communication system in recent years, also more and more higher to the requirement of filter, requirement meets the index of high inhibition, filter with low insertion loss under the restriction of given size and interface requirement.Generalized Chebyshev protosype makes and meets needs resonator number still less under same Out-of-band rejection condition by the introducing transmission zero, yet the demand of specific topological form and coupling polarity is frequent and size and the interface requirement contradiction of filter.
Summary of the invention
The objective of the invention is in order to propose a kind of coaxial output filter and method for designing thereof.
The objective of the invention is to be achieved through the following technical solutions.
A kind of coaxial output filter of the present invention, this filter does not need cross coupling structure, thus generation and adjustment that the polarity of controlling coupling by mounting means and the coupling window shape of resonant rod and coupling amount size complete transmission zero;
This coaxial output filter is one or three rank coaxial filters, and this coaxial filter comprises the first resonant cavity, the second resonant cavity, the 3rd resonant cavity, the first resonant rod, the second resonant rod, the 3rd resonant rod, step coupling window, the second coupling window, input tap coupling line, output tap coupling line, resonant rod adjusting pad and cover plate; The first resonant rod is positioned at the first resonant cavity, and the second resonant rod is positioned at the second resonant cavity, and the 3rd resonant rod is positioned at the 3rd resonant cavity;
This coaxial filter is a cuboid hollow box, cover plate is stamped at the box body top, input tap coupling line is from the narrow flank side surface input cavity of cuboid, directly be welded on the first resonant rod, the first resonant rod is arranged on the long side face of cuboid, the first resonant rod and the second resonant rod, the 3rd resonant rod are realized coupling by the stepped ramp type coupling window, the second resonant rod is arranged on the bottom surface of cuboid, and realize coupling by the second coupling window and the 3rd resonant rod, the 3rd resonant rod is arranged on another side on the long limit of cuboid; Output tap coupling line is welded on the 3rd resonant rod, and exports cavity in another narrow flank side surface of cuboid; Regulate pad with resonant rod when the first resonant rod, the second resonant rod, the 3rd resonant rod are installed and carry out the height adjusting.
Filter of the present invention can expand to the higher order filter form.Can be widely applied in the Radio-Frequency Wireless Communication system.
The method for designing of a kind of coaxial output filter of the present invention, step is:
1 adds the lump port in the all-wave Electromagnetic Simulation model established, and in the position of the electric field maximum of each resonator, adds a port consistent with direction of an electric field.For coaxial filter, because of its electric field of open end at resonant rod maximum, thereby the foundation rule of this lump port be an end from the open end of resonant rod, along direction of an electric field, be cavity inner surface with extending to.The first resonant rod has been set up the lump port one, and the second resonant rod has been set up lump port 2, the three resonant rods and set up lump port 3.
2 carry out effective whole Electromagnetic Simulation analysis at the coaxial filter all-wave Electromagnetic Simulation model that has added the lump port.
After completing, 3 emulation obtain an input/output port by filter and 35 port simulation results that the lump port forms, then use circuit grade simulated, by between 3 lump port end and two two-port, adding lumped capacity, the numerical value of regulating these lumped capacities makes the simulation result of filter reach the response results of ideal filter.
The 4 judgement step coupling window of the size by control capacittance and the size of the second coupling window and the deviations of the first resonant rod, the second resonant rod and the 3rd resonant rod height and ideal dimensions, then revise corresponding size in whole field model.Then again by step 2, start the design of next round simulation and optimization, until the simulation result of all-wave electromagnetic field model reaches desirable response results.
Beneficial effect
The present invention adjusts the size of the length and location of three resonant rods and the partition wall between them by the collaborative simulation technology, make three couplings reach the coupling amount needed simultaneously, solved the problem that cannot design by conventional method because the structure proposed does not meet Symmetry Condition.
The final product of the present invention only need to be regulated pad by resonant rod to the height of three resonant rods and just finely tune and can reach the performance consistent with simulation result.
The present invention is because total is not used adjustment screw, so can improve to a great extent the power capacity of filter.
Filter of the present invention can expand to the higher order filter form.Can be widely applied in the Radio-Frequency Wireless Communication system.
The accompanying drawing explanation
Fig. 1 is Filter Principle circuit diagram of the present invention;
The structural representation that Fig. 2 is filter of the present invention;
Fig. 3 is filter collaborative simulation field model, has marked in figure in each resonator and has added for coordinately regulated lump port;
The final full-wave simulation that Fig. 4 is filter is figure as a result, by simulation result, uses as seen synergy emulation method can obtain fast by alternative manner the corresponding physical dimension of ideal response of filter.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment
This coaxial output filter is one or three rank coaxial filters, and this coaxial filter comprises the first resonant cavity 1, the second resonant cavity 2, the 3rd resonant cavity 3, the first resonant rod 4, the second resonant rod 5, the 3rd resonant rod 6, step coupling window 7, the second coupling window 8, input tap coupling line 9, output tap coupling line 10, resonant rod adjusting pad 11 and cover plate; The first resonant rod 4 is positioned at the first resonant cavity 1, the second resonant rod 5 and is positioned at the second resonant cavity 2, the three resonant rods 6 and is positioned at the 3rd resonant cavity 3;
This coaxial filter is a cuboid hollow box, cover plate is stamped at the box body top, input tap coupling line 9 is from the narrow flank side surface input cavity of cuboid, directly be welded on the first resonant rod 4, the first resonant rod 4 is arranged on the long side face of cuboid, the first resonant rod 4 and the second resonant rod 5, the 3rd resonant rod 6 are realized coupling by stepped ramp type coupling window 7, the second resonant rod 5 is arranged on the bottom surface of cuboid, and realize coupling by the second coupling window 8 and the 3rd resonant rod 6, the 3rd resonant rod 6 is arranged on another side on the long limit of cuboid; Output tap coupling line 10 is welded on the 3rd resonant rod 6, and exports cavity in another narrow flank side surface of cuboid; Regulate pad 11 with resonant rod when the first resonant rod 4, the second resonant rod 5, the 3rd resonant rod 6 are installed and carry out the height adjusting.
Below provide the techniqueflow that uses synergy emulation method to design this filter:
1, according to the circuit theory diagrams of Fig. 1, can learn, coupling between the first resonant cavity 1, the second resonant cavity 2, the 3rd resonant cavity 3 is negative coupling, and know according to the electromagnetic field couples theory, the installation direction of resonant rod can be controlled the polarity of coupling, being coupled as just of two resonators of installed surface resonant rod short circuit face on same plane is coupled, and installed surface being coupled as on Different Plane born coupling.Thereby the described version of Fig. 2 can realize negative coupling.
2, for the size of step coupling window 7 and the second coupling window 8 and determining of the first resonant rod 4, the second resonant rod 5 and the 3rd resonant rod 6 height, need to use the collaborative simulation technology.Its method of operation is for add the lump port in the all-wave Electromagnetic Simulation model established, and it is set up the position that rule is the electric field maximum at each resonator and adds a port consistent with direction of an electric field.For coaxial filter, because of its electric field of open end at resonant rod maximum, thereby the foundation rule of this lump port be an end from the open end of resonant rod, along direction of an electric field, be cavity inner surface with extending to.As shown in Figure 3, the first resonant rod 4 has been set up the lump port one, and the second resonant rod 5 has been set up lump port 2, the three resonant rods 4 and set up lump port 3.
3, carry out effective whole Electromagnetic Simulation analysis at the coaxial filter all-wave Electromagnetic Simulation model that has added the lump port.
4, emulation obtains an input/output port by filter and 35 port simulation results that the lump port forms after completing, then use circuit grade simulated, by between 3 lump port end and two two-port, adding lumped capacity, the numerical value of regulating these lumped capacities makes the simulation result of filter reach the response results of ideal filter.
5, the deviation of the size of the judgement step coupling window 7 of the size by control capacittance and the second coupling window 8 and the first resonant rod 4, the second resonant rod 5 and the 3rd resonant rod 6 height and ideal dimensions, then revise corresponding size in whole field model.Then again by step 3, start the design of next round simulation and optimization, until the simulation result of all-wave electromagnetic field model reaches desirable response results.Simulation result as shown in Figure 4.Good filtering characteristic is arranged, when wherein S11 return loss means that energy is inputted from input port, be reflected back the energy of input port, the energy when S21 insertion loss means that input port is transferred to delivery outlet.

Claims (3)

1. a coaxial output filter, it is characterized in that: this coaxial output filter is one or three rank coaxial filters, and this coaxial filter comprises the first resonant cavity (1), the second resonant cavity (2), the 3rd resonant cavity (3), the first resonant rod (4), the second resonant rod (5), the 3rd resonant rod (6), step coupling window (7), the second coupling window (8), input tap coupling line (9), output tap coupling line (10) and cover plate; The first resonant rod (4) is positioned at the first resonant cavity (1), and the second resonant rod (5) is positioned at the second resonant cavity (2), and the 3rd resonant rod (6) is positioned at the 3rd resonant cavity (3);
This coaxial filter is a cuboid hollow box, cover plate is stamped at the box body top, input tap coupling line (9) is from the narrow flank side surface input cavity of cuboid, directly be welded on the first resonant rod (4), the first resonant rod (4) is arranged on the long side face of cuboid, the first resonant rod (4) and the second resonant rod (5), the 3rd resonant rod (6) is realized coupling by stepped ramp type coupling window (7), the second resonant rod (5) is arranged on the bottom surface of cuboid, and realize coupling by coupling window (8) and the 3rd resonant rod (6), the 3rd resonant rod (6) is arranged on another side on the long limit of cuboid, it is upper that output tap coupling line (10) is welded on the 3rd resonant rod (6), and export cavity in another narrow flank side surface of cuboid.
2. a kind of coaxial output filter according to claim 1, is characterized in that: regulate pad with resonant rod when the first resonant rod (4), the second resonant rod (5), the 3rd resonant rod (6) are installed and carry out the height adjusting.
3. the method for designing of a coaxial output filter is characterized in that:
1) use the collaborative simulation technology to add the lump port in the all-wave Electromagnetic Simulation model established, this lump port is from the open end of resonant rod electric field maximum, extend to cavity inner surface along direction of an electric field, set up the lump port one at the first resonant rod (4), set up lump port 2, the three resonant rods (4) at the second resonant rod (5) and set up lump port 3;
2) carry out effective whole Electromagnetic Simulation analysis at the coaxial filter all-wave Electromagnetic Simulation model that has added the lump port;
3) emulation obtains an input/output port by filter and 35 port simulation results that the lump port forms after completing, then use circuit grade simulated, by between 3 lump port end and two two-port, adding lumped capacity, the numerical value of regulating these lumped capacities makes the simulation result of filter reach the response results of ideal filter;
4) size of the judgement step coupling window (7) of the size by control capacittance and the second coupling window (8) and the first resonant rod (4), the second resonant rod (5) and the 3rd resonant rod (6) highly with the deviation of ideal dimensions, then revise in whole field model size accordingly; Then again by step 2) start the design of next round simulation and optimization, until the simulation result of all-wave electromagnetic field model reaches desirable response results.
CN201310446201.XA 2013-09-26 2013-09-26 Design method for coaxial output filter Active CN103474730B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014116813A (en) * 2012-12-11 2014-06-26 Nec Corp Semi-coaxial filter and radio communication module
CN113410603A (en) * 2021-06-16 2021-09-17 聪微科技(深圳)有限公司 Microwave filter and manufacturing method thereof

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05335807A (en) * 1992-06-04 1993-12-17 Murata Mfg Co Ltd Coaxial microwave filter
US5495216A (en) * 1994-04-14 1996-02-27 Allen Telecom Group, Inc. Apparatus for providing desired coupling in dual-mode dielectric resonator filters
US6262639B1 (en) * 1998-05-27 2001-07-17 Ace Technology Bandpass filter with dielectric resonators
CN1941497A (en) * 2005-09-27 2007-04-04 M/A-Com公司 Dielectric resonators with axial gaps and circuits with such dielectric resonators
CN1965439A (en) * 2005-01-11 2007-05-16 株式会社村田制作所 Tunable filter, duplexer and communication apparatus
US20110025433A1 (en) * 2009-07-31 2011-02-03 Ming Yu Inline cross-coupled coaxial cavity filter
CN202217752U (en) * 2011-08-16 2012-05-09 武汉凡谷电子技术股份有限公司 Filter coupling structure
CN102509826A (en) * 2011-11-17 2012-06-20 摩比天线技术(深圳)有限公司 TM mode dielectric filter

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05335807A (en) * 1992-06-04 1993-12-17 Murata Mfg Co Ltd Coaxial microwave filter
US5495216A (en) * 1994-04-14 1996-02-27 Allen Telecom Group, Inc. Apparatus for providing desired coupling in dual-mode dielectric resonator filters
US6262639B1 (en) * 1998-05-27 2001-07-17 Ace Technology Bandpass filter with dielectric resonators
CN1965439A (en) * 2005-01-11 2007-05-16 株式会社村田制作所 Tunable filter, duplexer and communication apparatus
CN1941497A (en) * 2005-09-27 2007-04-04 M/A-Com公司 Dielectric resonators with axial gaps and circuits with such dielectric resonators
US20110025433A1 (en) * 2009-07-31 2011-02-03 Ming Yu Inline cross-coupled coaxial cavity filter
CN202217752U (en) * 2011-08-16 2012-05-09 武汉凡谷电子技术股份有限公司 Filter coupling structure
CN102509826A (en) * 2011-11-17 2012-06-20 摩比天线技术(深圳)有限公司 TM mode dielectric filter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014116813A (en) * 2012-12-11 2014-06-26 Nec Corp Semi-coaxial filter and radio communication module
CN113410603A (en) * 2021-06-16 2021-09-17 聪微科技(深圳)有限公司 Microwave filter and manufacturing method thereof
CN113410603B (en) * 2021-06-16 2022-08-02 聪微科技(深圳)有限公司 Microwave filter and manufacturing method thereof

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