CN102222812B - Round-chamber dual-mode side-wall coupling filter capable of inhibiting parasitic coupling - Google Patents
Round-chamber dual-mode side-wall coupling filter capable of inhibiting parasitic coupling Download PDFInfo
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- CN102222812B CN102222812B CN 201110052437 CN201110052437A CN102222812B CN 102222812 B CN102222812 B CN 102222812B CN 201110052437 CN201110052437 CN 201110052437 CN 201110052437 A CN201110052437 A CN 201110052437A CN 102222812 B CN102222812 B CN 102222812B
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Abstract
The invention provides a round-chamber dual-mode side-wall coupling filter capable of inhibiting parasitic coupling, which can be used as a part independently so as to play the role of filtering a certain frequency band and also can be combined so as to be used as a multiplexer passage filter, to form a multiplexer network. After the electromagnetic field characteristic in the round-chamber dual-mode side-wall coupling filter is analyzed, the aim of inhibiting the parasitic coupling is realized by placing tuning screws at different positions; furthermore, the filter characteristic of the round-chamber dual-mode side-wall coupling filter is reinforced, so as to enable the transmission characteristic of the filter to be symmetric; the advantages of the top-coupled round-chamber dual-mode filter, such as high Q value, wide single-mode working scope, simplicity in debugging and capable of being applied to narrowband design and the like, can be completely inherited, so as to enable the filter to be feasibly applied to the field of a microwave filter of a communication satellite; the filter comprises an upper half chamber body, a lower half chamber body, a frequency tuning screw, a coupling tuning screw and a fastening screw; and an external temperature compensation device can be arranged on the whole filter, so that the temperature stability of the filter can be ensured.
Description
Technical field
The present invention relates to a kind of cylindrical cavity bimodulus sidewall coupling filter that suppresses parasitic couplings, belong to the microwave filter field, also can be used as the path filter of multiplexer.
Background technology
In satellite communication system, cavity body filter is indispensable passive device.The sidewall coupling filter is a kind of novel, is applicable to the cavity body filter of satellite communication and international at present and domestic cavity body filter commonly used such as rectangular waveguide diaphragm type filter, and cylindrical cavity bimodulus top coupling filter is compared, and has outstanding advantage.Rectangular waveguide diaphragm type filter generally is used for broadband filter, its Q value is also relatively low, the latter is the path filter of Chang Zuowei tradition output multiplexer then, but because its coupling aperture is positioned at the cylindrical cavity top, the filter resonance cavity is an axially-aligned, makes its heat dispersion relatively poor, and this filter is difficult to realize temperature-compensating, limited its very crucial power capacity characteristic, the power capacity of Ku frequency range 150W has become the limit of invar thin-walled cylindrical cavity dual mode filter at present.
Be all the sidewall coupling filter of cylindrical cavity bimodulus, because its coupling aperture is positioned at the cylindrical cavity sidewall, this makes the filter resonance cavity for being arranged in parallel, and filter cylinder resonator body plane is arranged, and temperature compensation means can be settled in its top and bottom.Like this, overcome cylindrical cavity bimodulus top coupling filter shortcoming commonly used on the one hand, inherited on the other hand its high Q value, single mode operation wide ranges, debugging simple, can be applied to advantage such as arrowband design, but because the coupling window of cylindrical cavity bimodulus sidewall coupling filter is positioned at the cylindrical cavity sidewall, this has just introduced very big filter parasitic coupling, this parasitic couplings is enough to the electrical property of heavy damage filter, make its transmission characteristic asymmetric, index request can't be satisfied, and the path filter of multiplexer can't be become.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, a kind of cylindrical cavity bimodulus sidewall coupling filter that suppresses parasitic couplings is provided, this filter has the transmission characteristic of symmetry, high-power, high Q value, single mode operation wide ranges, debugs simply, can be applied in the actual engineering, can satisfy the communication system applications requirement that present stage increases day by day.
Technical solution of the present invention is:
A kind of cylindrical cavity bimodulus sidewall coupling filter that suppresses parasitic couplings is characterized in that: comprise first cavity, second cavity, frequency tuning screw, coupling tuning screw, trip bolt;
The cylindrical cavity bimodulus sidewall coupling filter of described inhibition parasitic couplings is 4 rank filters, is fastened by first cavity and second cavity and forms two cylindric resonant cavities, and first cavity and second cavity all have flange face, and two flange faces connect by trip bolt; Described two resonant cavity sidewalls are coupled and all are operated in pattern TE113 mould, and according to the transmission sequence of microwave signal in the cylindrical cavity bimodulus sidewall coupling filter of described inhibition parasitic couplings, two resonant cavities are followed successively by first resonant cavity and second resonant cavity;
The sidewall of first resonant cavity has the rectangle input coupling window, and the sidewall of second resonant cavity has the rectangle output coupling window, and the line between input coupling window and the output coupling window can all be divided into two halves with first resonant cavity and second resonant cavity; Also have three rectangle coupling windows between first resonant cavity and second resonant cavity, distribute in a triangle; Top window in three coupling windows that described isosceles triangle distributes forms after being fastened by first cavity and second cavity, promptly first resonant cavity in first cavity cylindrical cavity and the part between the cylindrical cavity of second resonant cavity in first cavity, and cylindrical cavity and the sunk part second resonant cavity cylindrical cavity in second cavity between of first resonant cavity in second cavity forms after fastening; Two other window is distributed on second cavity in three coupling windows that described isosceles triangle distributes;
The top center position of first cavity directly over the top window in three coupling windows that promptly described isosceles triangle distributes, is useful on the screwed hole that the coupling tuning screw is installed;
On the sidewall of first cavity, be positioned at first cavity and second cavity fasten after directly over the input coupling window and the position directly over the output coupling window, screwed hole is arranged, be used to install frequency tuning screw perpendicular to first cavity wall; With described to be positioned at first cavity and second cavity vertical with the screwed hole of position directly over the output coupling window and be positioned at position on the sidewall of first cavity equally directly over the input coupling window after fastening, screwed hole is also arranged, be used to install the frequency tuning screw; At the angular bisector at the right angle that orthogonal two screwed holes form and be positioned at position on the sidewall of first cavity, screwed hole is arranged, be used for installing the coupling tuning screw; Frequency tuning screw on first cavity and coupling tuning screw all are positioned at same plane, and are positioned at first cavity and second cavity and form whole 5/6 after fastening and highly locate;
After first cavity and second cavity fastening, be positioned on the sidewall of second cavity under the coupling tuning screw on first cavity wall, screwed hole is also arranged, be used for installing the coupling tuning screw; On the sidewall of second cavity, on the position perpendicular to two coupling windows in bottom in three coupling windows of described isosceles triangle distribution, screwed hole is arranged, be used for installing the coupling tuning screw; On the sidewall of second cavity, on the line direction perpendicular to input coupling window and output coupling window, screwed hole is arranged, be used to install the frequency tuning screw; On the sidewall of second cavity, there is screwed hole to be used for installing the coupling tuning screw on the position corresponding with input coupling window and output coupling window; Remove on second cavity outside the coupling tuning screw of input coupling window and output coupling window correspondence, all the other all frequency tuning screws and coupling tuning screw and are positioned at first cavity and second cavity and form whole 1/2 after fastening and highly locate all in same plane.
The present invention's beneficial effect compared with prior art is:
(1) the present invention is applied to cylindrical cavity bimodulus sidewall coupling filter in the actual engineering, and the certain location by exquisiteness is placed tuning screw, screw to the disturbance of electromagnetic field not simultaneously, the effective parasitic couplings of neutralizing filter.Filter of the present invention both can be used as the path filter use that independent filter also can be used as multiplexer, had symmetrical transmission characteristic, high-power, high Q value, single mode operation wide ranges, debugged simple characteristic.
(2) cylindrical cavity bimodulus sidewall coupling filter of the present invention is designed to cylindrical cavity, and makes it be operated in pattern TE113 mould.The characteristic of sidewall coupling is that filter can effectively be installed the external temperature compensation arrangement, obtains good temperature compensation characteristic.
(3) filter resonator of the present invention has adopted cylindrical cavity TE113 pattern, select suitable cavity diameter, can make this pattern away from other mode of resonance, make filter have very wide single mode operation wide ranges, can satisfy the demand of the path filter of multiplexer fully, and the coupling of this filter and frequency all can be debugged easily, and filter can be realized the arrowband and than the design in broadband, can satisfy communication system applications requirement widely.
Description of drawings
Fig. 1 is the S parameter amplitude curve of quadravalence broad sense Chebyshev with two transmission zeros;
Fig. 2 is the simulation curve of cylindrical cavity bimodulus sidewall coupling filter;
Fig. 3 is the overall structure schematic diagram of cylindrical cavity bimodulus sidewall coupling filter of the present invention;
Fig. 4 is the schematic diagram that cylindrical cavity calculates resonance frequency;
Fig. 5 is the schematic diagram that calculates input and output coupling amount;
Fig. 6 is the schematic diagram that calculates coupling amount between resonant cavity;
Embodiment
The invention provides a kind of cylindrical cavity bimodulus sidewall coupling filter that suppresses parasitic couplings, as shown in Figure 3, comprise first cavity 1, second cavity 2, frequency tuning screw 3, coupling tuning screw 4, trip bolt 5;
The cylindrical cavity bimodulus sidewall coupling filter of described inhibition parasitic couplings is 4 rank filters, form two cylindric resonant cavities by first cavity 1 and second cavity 2 fastenings, first cavity 1 and second cavity 2 all have flange face, and two flange faces connect by trip bolt 5; Described two resonant cavity sidewalls are coupled and all are operated in pattern TE113 mould, and according to the transmission sequence of microwave signal in the cylindrical cavity bimodulus sidewall coupling filter of described inhibition parasitic couplings, two resonant cavities are followed successively by first resonant cavity and second resonant cavity;
The sidewall of first resonant cavity has the rectangle input coupling window, and the sidewall of second resonant cavity has the rectangle output coupling window, and the line between input coupling window and the output coupling window can all be divided into two halves with first resonant cavity and second resonant cavity; Also have three rectangle coupling windows between first resonant cavity and second resonant cavity, distribute in a triangle; Top window in three coupling windows that described isosceles triangle distributes forms after being fastened by first cavity 1 and second cavity 2, promptly first resonant cavity in first cavity 1 cylindrical cavity and the part between the cylindrical cavity of second resonant cavity in first cavity 1, and cylindrical cavity and the sunk part second resonant cavity cylindrical cavity in second cavity 2 between of first resonant cavity in second cavity 2 forms after fastening; Two other window is distributed on second cavity 2 in three coupling windows that described isosceles triangle distributes;
The top center position of first cavity 1 directly over the top window in three coupling windows that promptly described isosceles triangle distributes, is useful on the screwed hole that coupling tuning screw 4 is installed;
On the sidewall of first cavity 1, be positioned at first cavity 1 and second cavity 2 fasten after directly over the input coupling window and the position directly over the output coupling window, screwed hole is arranged, be used to install frequency tuning screw 3 perpendicular to first cavity 1 sidewall; With described to be positioned at first cavity 1 and second cavity 2 vertical with the screwed hole of position directly over the output coupling window and be positioned at position on the sidewall of first cavity 1 equally directly over the input coupling window after fastening, screwed hole is also arranged, be used to install frequency tuning screw 3; At the angular bisector at the right angle that orthogonal two screwed holes form and be positioned at position on the sidewall of first cavity 1, screwed hole is arranged, be used for installing coupling tuning screw 4; Frequency tuning screw 3 on first cavity 1 and coupling tuning screw all are positioned at same plane, and are positioned at first cavity 1 and second cavity 2 and form whole 5/6 after fastening and highly locate;
After first cavity 1 and second cavity 2 fastenings, be positioned on the sidewall of second cavity 2 under the coupling tuning screw 4 on first cavity 1 sidewall, screwed hole is also arranged, be used for installing coupling tuning screw 4; The coupling tuning screw (4) of these two correspondences is the screws that are used to regulate same coupling amount, works simultaneously and can realize suppressing the function of parasitic couplings.On the sidewall of second cavity 2, on the position perpendicular to two coupling windows in bottom in three coupling windows of described isosceles triangle distribution, screwed hole is arranged, be used for installing coupling tuning screw 4;
On the sidewall of second cavity 2, on the line direction perpendicular to input coupling window and output coupling window, screwed hole is arranged, be used to install frequency tuning screw 3; On the sidewall of second cavity 2, there is screwed hole to be used for installing coupling tuning screw 4 on the position corresponding with input coupling window and output coupling window; Remove on second cavity 2 outside the coupling tuning screw of input coupling window and output coupling window correspondence, all the other all frequency tuning screws 3 and coupling tuning screw 4 and are positioned at first cavity 1 and second cavity 2 and form whole 1/2 after fastening and highly locate all in same plane.
First cavity 1 and second cavity 2 fasten the filter that forms, and 2 resonant cavitys are the design of cylindrical cavity bimodulus, promptly contain two resonance frequencys in a resonant cavity.2 resonant cavities are numbered first resonant cavity and second resonant cavity according to the transmission sequence of microwave signal.Be to be resonance frequency 3 and 4 in resonance frequency 1 and 2, the second resonant cavitys in first resonant cavity, different resonance frequencys is adjusted by the different frequency tuning screw on the resonant cavity sidewall.The first resonant cavity sidewall design has input coupling window; The second resonant cavity sidewall design has output coupling window, and all coupling window cross sections are rectangle.Fastening the resonant cavity that forms by first cavity 1 and second cavity 2 is cylinder, the size of resonant cavity designs according to the difference of filter frequencies, the size of coupling window designs according to the difference of filter bandwidht, the input and output coupling window is connected to waveguide port, waveguide port is positioned at second cavity 2, and has designed externally by screw flange connecting interface.First cavity 1 and second cavity 2 all have flange face, and two flange faces connect by trip bolt 5, and also designing on the metal wall between resonant cavity has screw, can connect by screw.
First cavity 1 and second cavity 2 can use the low-expansion alloy material, then the external temperature compensation arrangement can be installed, first cavity 1 and second cavity 2 also can use the metal of aluminium or other lighter weight, at the top of first cavity 1 or the bottom of second cavity 2 the external temperature compensation arrangement is installed, can be made filter realize good temperature stabilization characteristic like this.First cavity 1 and second cavity 2 can carry out surface treatment.
Filter of the present invention is the quadravalence broad sense Chebyshev filter with a pair of transmission zero, comprehensive and the typical broad sense Chebyshev filter of its coupling matrix is identical, existing self-compiling program or business software can draw the filter coupled matrix that satisfies index request, the filter transfer curve of obtaining for coupling matrix as Fig. 1, the transmission characteristic simulation curve of Fig. 2 for finally obtaining among the CST, centre frequency is 12.585MHz, and bandwidth is 38MHz, return loss-19dB.Filter of the present invention, total input and output, main coupling, cross-couplings and four self couplings amount to eight coupling amounts, can corresponding find corresponding coupling amount in the coupling matrix of 6X6.
The cylindrical cavity planar structure of cylindrical cavity bimodulus sidewall coupling filter is arranged, resonant cavity adopts the design of TE113 cylindrical cavity bimodulus, Ku frequency range under this pattern, the single mode operation bandwidth can 〉=500MHz, this kind filter can be designed to narrow band filter simultaneously, so in conjunction with this two aspects factor, can be with this kind filter applies in the multiplexer design, as a path filter use of multiplexer.Open " product " font three window coupled structures between two cylindrical cavity body, the input and output coupling window is opened in the coupling of the side of being, filter bottom window, and all coupling apertures all are the magnetic coupling hole, so the hole is all bigger.Filter is coated with temperature control lacquer, conducting resinl, heat-conducting glue, and silver-plated at inner surface.
Cylindrical cavity bimodulus sidewall coupling filter can add temperature compensation means in the resonant cavity top and the bottom, improve temperature characterisitic.High-power product often is subjected to the influence of working temperature, and along with the variation of working temperature, passband can be offset thereupon, influences service behaviour.Though select little material such as the invar of temperature coefficient can improve temperature characterisitic, limited in one's ability.Traditional circular waveguide filter resonator all is up and down a position of opening, have no idea to adopt the temperature compensator of physics such as temperature compensation bow, and all coupling apertures of this invention are all opened the side at resonator, when helping dispelling the heat making filter construction become the plane, maximum benefit is the temperature compensator that can be added into temperature compensation bow and so in the top and bottom of resonator.Temperature compensator (as temperature compensation bow) is during by variations in temperature, thus temperature compensation bow tension or loosen the method that causes the deformation of resonator top and bottom to change resonance frequency and remedy because the frequency shift (FS) that temperature causes.Therefore, can very significantly improve the filter temperature characterisitic after having added temperature compensator.
The simulation calculation of cylindrical cavity bimodulus sidewall coupling filter may further comprise the steps:
1) in commercial HFSS of simulation software or CST, utilizes the character modules solver, set up the resonant cavity model,, make resonant cavity resonance at required frequency, and have good Q value and single mode operation bandwidth by adjusting the size of resonant cavity size and corner cut.As Fig. 4 is a cylindrical cavity resonator model that utilizes HFSS character modules solver to calculate.Because what calculate is an independently resonator, and in fact also needs out coupling window, holds the resonance frequency that coupling window can reduce resonator, therefore should make resonance frequency herein here a little more than required frequency.
2) input or output coupling window for resonant cavity adds, utilize the group delay simulation method, the input and output group delay that corresponding coupling matrix calculates, the pass of group delay and input and output coupling amount is
M wherein
01For inputing or outputing coupling, B
ωBe bandwidth, τ (ω
0) be group delay; Adjustment coupling window size makes the group delay of emulation equate with the group delay that coupling matrix calculates.Draw the input output window size of filter, as Fig. 5.
3) calculating of coupling window adopts eigen mode to find the solution mode between the chamber.In simulation software, set up the model in two chambeies,, calculate coupling amount between two chambeies by the character modules solver as Fig. 6.Difference between the pattern that coupling amount between two chambeies equals to find the solution, this value should equal the product of coupling coefficient and design bandwidth, that is: Coup=M
Ij* B
ω, M wherein
IjBe corresponding coupling coefficient; B
ωBe bandwidth, Coup is corresponding actual coupling amount.
4) after above-mentioned steps is finished, need carry out whole emulation to filter, by step 1), step 2) and step 3) obtained initial filter size and window size, can regulate each size repeatedly, change the size of coupling window and frequency screw by the quality of S parameter relatively, finally reach good simulation result.Can certainly adopt other method to carry out whole emulation.
5) length of the difference coupling screw of adjusting filter input end cavity can be eliminated the influence of filter parasitic coupling effectively.
Final of the present inventionly can reach following performance parameter and index, as shown in table 1:
Table 1
Claims (1)
1. a cylindrical cavity bimodulus sidewall coupling filter that suppresses parasitic couplings is characterized in that: comprise first cavity (1), second cavity (2), frequency tuning screw (3), coupling tuning screw (4), trip bolt (5);
The cylindrical cavity bimodulus sidewall coupling filter of described inhibition parasitic couplings is 4 rank filters, form two cylindric resonant cavities by first cavity (1) and second cavity (2) fastening, first cavity (1) and second cavity (2) all have flange face, and two flange faces connect by trip bolt (5); Described two resonant cavity sidewalls are coupled and all are operated in pattern TE113 mould, and according to the transmission sequence of microwave signal in the cylindrical cavity bimodulus sidewall coupling filter of described inhibition parasitic couplings, two resonant cavities are followed successively by first resonant cavity and second resonant cavity;
The sidewall of first resonant cavity has the rectangle input coupling window, and the sidewall of second resonant cavity has the rectangle output coupling window, and the line between input coupling window and the output coupling window all is divided into two halves with first resonant cavity and second resonant cavity; Also have three rectangle coupling windows between first resonant cavity and second resonant cavity, distribute in a triangle; Top window in three coupling windows that described isosceles triangle distributes forms after being fastened by first cavity (1) and second cavity (2), promptly first resonant cavity in first cavity (1) cylindrical cavity and the part between the cylindrical cavity of second resonant cavity in first cavity (1), and cylindrical cavity and the sunk part second resonant cavity cylindrical cavity in second cavity (2) between of first resonant cavity in second cavity (2) forms after fastening; Two other window is distributed on second cavity (2) in three coupling windows that described isosceles triangle distributes;
The top center position of first cavity (1) directly over the top window in three coupling windows that promptly described isosceles triangle distributes, is useful on the screwed hole that coupling tuning screw (4) is installed;
On the sidewall of first cavity (1), be positioned at first cavity (1) and second cavity (2) fasten after directly over the input coupling window and the position directly over the output coupling window, screwed hole is arranged, be used for installing frequency tuning screw (3) perpendicular to first cavity (1) sidewall; With described to be positioned at first cavity (1) and second cavity (2) vertical with the screwed hole of position directly over the output coupling window and be positioned at position on the sidewall of first cavity (1) equally directly over the input coupling window after fastening, screwed hole is also arranged, be used to install frequency tuning screw (3); At the angular bisector at the right angle that orthogonal two screwed holes form and be positioned at position on the sidewall of first cavity (1), screwed hole is arranged, be used for installing coupling tuning screw (4); Frequency tuning screw (3) on first cavity (1) and coupling tuning screw all are positioned at same plane, and are positioned at first cavity (1) and second cavity (2) and form whole 5/6 after fastening and highly locate;
After first cavity (1) and second cavity (2) fastening, be positioned on the sidewall of second cavity (2) under the coupling tuning screw (4) on first cavity (1) sidewall, screwed hole is also arranged, be used for installing coupling tuning screw (4); On the sidewall of second cavity (2), on the position perpendicular to two coupling windows in bottom in three coupling windows of described isosceles triangle distribution, screwed hole is arranged, be used for installing coupling tuning screw (4); On the sidewall of second cavity (2), on the line direction perpendicular to input coupling window and output coupling window, screwed hole is arranged, be used to install frequency tuning screw (3); On the sidewall of second cavity (2), there is screwed hole to be used for installing coupling tuning screw (4) on the position corresponding with input coupling window and output coupling window; Remove on second cavity (2) outside the coupling tuning screw of input coupling window and output coupling window correspondence, all the other all frequency tuning screws (3) and coupling tuning screw (4) and are positioned at first cavity (1) and second cavity (2) and form whole 1/2 after fastening and highly locate all in same plane.
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| CN 201110052437 CN102222812B (en) | 2011-03-04 | 2011-03-04 | Round-chamber dual-mode side-wall coupling filter capable of inhibiting parasitic coupling |
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| CN102222812B true CN102222812B (en) | 2013-07-24 |
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| CN102496758B (en) * | 2011-12-19 | 2016-04-20 | 江苏贝孚德通讯科技股份有限公司 | The bimodulus cavity filter of circular corner cut |
| CN103280613B (en) * | 2013-04-25 | 2015-02-18 | 北京空间飞行器总体设计部 | Full-wave analysis combination method of multiplexer |
| CN103592510B (en) * | 2013-10-16 | 2016-03-30 | 西安空间无线电技术研究所 | A kind of microwave frequency calibrator and calibration steps thereof |
| CN115460873A (en) * | 2022-08-29 | 2022-12-09 | 西安空间无线电技术研究所 | Star carries high power clamp formula heat dissipation support for circular chamber |
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| US5805033A (en) * | 1996-02-26 | 1998-09-08 | Allen Telecom Inc. | Dielectric resonator loaded cavity filter coupling mechanisms |
| US6353373B1 (en) * | 2000-05-03 | 2002-03-05 | Xiao-Pang Liang | Coupling mechanisms for dielectric resonator loaded cavity filters |
| CN200947460Y (en) * | 2006-06-29 | 2007-09-12 | 摩比天线技术（深圳）有限公司 | Coupling structure between coaxial cavity resonators |
| CN101378142A (en) * | 2007-08-28 | 2009-03-04 | Ace技术株式会社 | Frequency tunable filter |
| CN101728611A (en) * | 2008-10-28 | 2010-06-09 | 西安恒达微波技术开发公司 | Waveguide branching adjacent channel synthesizer |
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2011
- 2011-03-04 CN CN 201110052437 patent/CN102222812B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5805033A (en) * | 1996-02-26 | 1998-09-08 | Allen Telecom Inc. | Dielectric resonator loaded cavity filter coupling mechanisms |
| US6353373B1 (en) * | 2000-05-03 | 2002-03-05 | Xiao-Pang Liang | Coupling mechanisms for dielectric resonator loaded cavity filters |
| CN200947460Y (en) * | 2006-06-29 | 2007-09-12 | 摩比天线技术（深圳）有限公司 | Coupling structure between coaxial cavity resonators |
| CN101378142A (en) * | 2007-08-28 | 2009-03-04 | Ace技术株式会社 | Frequency tunable filter |
| CN101728611A (en) * | 2008-10-28 | 2010-06-09 | 西安恒达微波技术开发公司 | Waveguide branching adjacent channel synthesizer |
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