CN103474730B - Design method for coaxial output filter - Google Patents
Design method for coaxial output filter Download PDFInfo
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- CN103474730B CN103474730B CN201310446201.XA CN201310446201A CN103474730B CN 103474730 B CN103474730 B CN 103474730B CN 201310446201 A CN201310446201 A CN 201310446201A CN 103474730 B CN103474730 B CN 103474730B
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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
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, require to meet under the restriction of given size and interface requirement highly to suppress, the index of filter with low insertion loss.The resonator number that Generalized Chebyshev protosype makes needs under satisfied same Out-of-band rejection condition less by introducing transmission zero, but the demand of specific topological form and coupling polarity is often and the size of filter and interface requirement contradiction.
Summary of the invention
The object of the invention is to propose a kind of coaxial output filter and method for designing thereof.
The object 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, completes generation and the adjustment of transmission zero by the polarity of the mounting means of resonant rod and the coupling of coupling window shape controlling with the amount of coupling size;
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 coupler line, exports tap coupler line, resonant rod adjustment pad and cover plate; 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 box body top, input tap coupler line is from the narrow flank side surface input cavity of cuboid, directly be welded on the first resonant rod, first resonant rod is arranged on the long side face of cuboid, first resonant rod realizes being coupled by stepped ramp type coupling window with the second resonant rod, the 3rd resonant rod, second resonant rod is arranged on the bottom surface of cuboid, and realize being coupled with the 3rd resonant rod by the second coupling window, the 3rd resonant rod is arranged on another side on the long limit of cuboid; Export tap coupler wire bonding on the 3rd resonant rod, and export cavity in another narrow flank side surface of cuboid; Regulate pad to carry out height with resonant rod when first resonant rod, the second resonant rod, the 3rd resonant rod are installed to regulate.
Filter of the present invention extends to higher order filter form.Can be widely applied in Radio-Frequency Wireless Communication system.
The method for designing of a kind of coaxial output filter of the present invention, step is:
1 adds lump port in the full-wave electromagnetic simulation model established, and adds a port consistent with direction of an electric field in the position that the electric field of each resonator is maximum.For coaxial filter, because it is maximum at the open end electric field of resonant rod, thus the foundation rule of this lump port is for one end is from the open end of resonant rod, is cavity inner surface with extending to along direction of an electric field.First resonant rod establishes lump port one, and the second resonant rod establishes lump port the 2, three resonant rod and establishes lump port 3.
2 carry out effective whole field Electromagnetic Simulation analysis at the coaxial filter full-wave electromagnetic simulation model adding lump port.
3 emulated after obtain the 5 port simulation results be made up of input/output port and 3 lump ports of filter, then circuit-level emulation is used, by adding lumped capacity between 3 lump port end and two two-port, the numerical value of these lumped capacities is regulated to make the simulation result of filter reach the response results of ideal filter.
4 judge the deviation of the size of step coupling window and the second coupling window and the first resonant rod, the second resonant rod and the 3rd resonant rod height and ideal dimensions by the sizes of control capacittance, then revise corresponding size in whole field model.Then again designed, until the simulation result of full-wave electromagnetic field model reaches desirable response results by next round simulation and optimization step 2.
Beneficial effect
The present invention adjusts the size of the length and location of three resonant rods and the partition wall between them by coordinate imitate technology, make three to be coupled and reach the coupling amount of needs simultaneously, solve 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 needs to regulate pad to carry out fine setting to the height of three resonant rods by resonant rod just can reach the performance consistent with simulation result.
The present invention does not have adjustment in use screw, so can improve the power capacity of filter to a great extent due to total.
Filter of the present invention extends to higher order filter form.Can be widely applied in Radio-Frequency Wireless Communication system.
Accompanying drawing explanation
Fig. 1 is Filter Principle circuit diagram of the present invention;
Fig. 2 is the structural representation of filter of the present invention;
Fig. 3 is filter collaborative simulation field model, has marked in each resonator and add for coordinately regulated lump port in figure;
Fig. 4 is the final full-wave simulation result figure of filter, the physical dimension corresponding to the ideal response using synergy emulation method can obtain filter fast by alternative manner as seen by simulation result.
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, second resonant cavity 2, the 3rd resonant cavity 3, first resonant rod 4, second resonant rod 5, the 3rd resonant rod 6, step coupling window 7, second coupling window 8, input tap coupler line 9, exports tap coupler line 10, resonant rod adjustment pad 11 and cover plate; First resonant rod 4 is positioned at the first resonant cavity 1, second resonant rod 5 and is positioned at the second resonant cavity the 2, three resonant rod 6 and is positioned at the 3rd resonant cavity 3;
This coaxial filter is a cuboid hollow box, cover plate is stamped at box body top, input tap coupler line 9 is from the narrow flank side surface input cavity of cuboid, directly be welded on the first resonant rod 4, first resonant rod 4 is arranged on the long side face of cuboid, first resonant rod 4 realizes being coupled by stepped ramp type coupling window 7 with the second resonant rod 5, the 3rd resonant rod 6, second resonant rod 5 is arranged on the bottom surface of cuboid, and realize being coupled with the 3rd resonant rod 6 by the second coupling window 8, the 3rd resonant rod 6 is arranged on another side on the long limit of cuboid; Export tap coupler line 10 to be welded on the 3rd resonant rod 6, and export cavity in another narrow flank side surface of cuboid; Regulate pad 11 to carry out height with resonant rod when first resonant rod 4, second resonant rod 5, the 3rd resonant rod 6 are installed to regulate.
Provide the techniqueflow using synergy emulation method to design this filter below:
1, can learn according to the circuit theory diagrams of Fig. 1, coupling between first resonant cavity 1, second resonant cavity 2, the 3rd resonant cavity 3 is negative coupling, and know according to electromagnetic field couples theory, the installation direction of resonant rod can control the polarity be coupled, being coupled as of two resonators of installed surface resonant rod short circuit face in same plane is just coupled, and installed surface being coupled as in Different Plane bears coupling.Thus the version described in Fig. 2 then can realize negative coupling.
2, for the size of step coupling window 7 and the second coupling window 8 and the determination of the first resonant rod 4, second resonant rod 5 and the 3rd resonant rod 6 height, need to use coordinate imitate technology.Its method of operation is add lump port in the full-wave electromagnetic simulation model established, and it sets up rule for add a port consistent with direction of an electric field in the position that the electric field of each resonator is maximum.For coaxial filter, because it is maximum at the open end electric field of resonant rod, thus the foundation rule of this lump port is for one end is from the open end of resonant rod, is cavity inner surface with extending to along direction of an electric field.As shown in Figure 3, the first resonant rod 4 establishes lump port one, and the second resonant rod 5 establishes lump port the 2, three resonant rod 4 and establishes lump port 3.
3, effective whole field Electromagnetic Simulation analysis is carried out at the coaxial filter full-wave electromagnetic simulation model adding lump port.
4, the 5 port simulation results be made up of input/output port and 3 lump ports of filter are obtained after having emulated, then circuit-level emulation is used, by adding lumped capacity between 3 lump port end and two two-port, the numerical value of these lumped capacities is regulated to make the simulation result of filter reach the response results of ideal filter.
5, judged the deviation of the size of step coupling window 7 and the second coupling window 8 and the first resonant rod 4, second resonant rod 5 and the 3rd resonant rod 6 height and ideal dimensions by the size of control capacittance, then revise corresponding size in whole field model.Then again designed, until the simulation result of full-wave electromagnetic field model reaches desirable response results by next round simulation and optimization step 3.Simulation result as shown in Figure 4.There is good filtering characteristic, when wherein S11 return loss represents that energy inputs from input port, be reflected back the energy of input port, energy when S21 insertion loss represents that input port is transferred to delivery outlet.
Claims (1)
1. the method for designing of a coaxial output filter, 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 coupler line (9), exports tap coupler line (10) and cover plate; 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 box body top, input tap coupler line (9) is from the narrow flank side surface input cavity of cuboid, directly be welded on the first resonant rod (4), first resonant rod (4) is arranged on the long side face of cuboid, first resonant rod (4) and the second resonant rod (5), 3rd resonant rod (6) realizes coupling by step coupling window (7), second resonant rod (5) is arranged on the bottom surface of cuboid, and realize being coupled with the 3rd resonant rod (6) by the second coupling window (8), 3rd resonant rod (6) is arranged on another side on the long limit of cuboid, export tap coupler line (10) to be welded on the 3rd resonant rod (6), and export cavity in another narrow flank side surface of cuboid,
Regulate pad to carry out height with resonant rod when first resonant rod (4), the second resonant rod (5), the 3rd resonant rod (6) are installed to regulate;
Resonant rod regulates pad to be arranged on one end of the first resonant rod (4), the second resonant rod (5), the 3rd resonant rod (6) respectively, and the first resonant rod (4), the second resonant rod (5), the 3rd resonant rod (6) regulate pad to be connected with the first resonant cavity (1), the second resonant cavity (2), the 3rd resonant cavity (3) respectively by resonant rod;
It is characterized in that:
1) coordinate imitate technology is used to add lump port in the full-wave electromagnetic simulation model established, this lump port is from the open end that resonant rod electric field is maximum, cavity inner surface is extended to along direction of an electric field, lump port one is set up at the first resonant rod (4), set up lump port the 2, three resonant rod (6) at the second resonant rod (5) and set up lump port 3;
2) effective whole field Electromagnetic Simulation analysis is carried out to the coaxial filter full-wave electromagnetic simulation model adding lump port;
3) the 5 port simulation results be made up of input/output port and 3 lump ports of filter are obtained after having emulated, then circuit-level emulation is used, by adding lumped capacity between 3 lump port end and two two-port, the numerical value of these lumped capacities is regulated to make the simulation result of filter reach the response results of ideal filter;
4) judged the deviation of the size of step coupling window (7) 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 by the size of control capacittance, then revise corresponding size in whole field model; Then again by step 2) next round simulation and optimization design, until the simulation result of full-wave electromagnetic field model reaches desirable response results.
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| CN201310446201.XA CN103474730B (en) | 2013-09-26 | 2013-09-26 | Design method for coaxial output filter |
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| CN201310446201.XA CN103474730B (en) | 2013-09-26 | 2013-09-26 | Design method for coaxial output filter |
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| CN103474730B true CN103474730B (en) | 2015-04-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2014116813A (en) * | 2012-12-11 | 2014-06-26 | Nec Corp | Semi-coaxial filter and radio communication module |
| CN113410603B (en) * | 2021-06-16 | 2022-08-02 | 聪微科技(深圳)有限公司 | Microwave filter and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102509826A (en) * | 2011-11-17 | 2012-06-20 | 摩比天线技术（深圳）有限公司 | TM mode dielectric filter |
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| 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 |
| DE112005001053B4 (en) * | 2005-01-11 | 2015-04-16 | Murata Mfg. Co., Ltd. | Tunable filter, duplexer and communication device |
| US8085118B2 (en) * | 2009-07-31 | 2011-12-27 | Com Dev International Ltd. | 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 |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102509826A (en) * | 2011-11-17 | 2012-06-20 | 摩比天线技术（深圳）有限公司 | TM mode dielectric filter |
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