CN104319444A - Double-frequency cavity filter compatible to working frequencies of GPS and Beidou - Google Patents
Double-frequency cavity filter compatible to working frequencies of GPS and Beidou Download PDFInfo
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- CN104319444A CN104319444A CN201410606432.7A CN201410606432A CN104319444A CN 104319444 A CN104319444 A CN 104319444A CN 201410606432 A CN201410606432 A CN 201410606432A CN 104319444 A CN104319444 A CN 104319444A
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- 238000001914 filtration Methods 0.000 claims abstract description 15
- 238000006880 cross-coupling reaction Methods 0.000 claims abstract description 6
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 claims description 15
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Abstract
The invention discloses a structure of a double-frequency cavity filter compatible to working frequencies of GPS and Beidou. The double-frequency cavity filter is provided with a cavity (1), resonators (2), coupling blocks (3), tuning threaded rods (4), cross coupling windows (5) among the resonators, a covering plate (6) and a radio-frequency connector (7), and is characterized in that passages among the resonators (2) are of an all-pass structure, meanwhile, the coupling blocks (3) are arranged to reinforce coupling among the resonators, and therefore a broadband filtering performance is achieved. The double-frequency cavity filter is applied to a GPS and Beidou double-mode navigation receiving system, is used for receiving the front segment of system radio frequency in the process of navigation, receives GPS and Beidou signals, restrains useless signals out of band, and has the advantages of being small in insertion loss and high in out-of-band rejection.
Description
Technical field
The invention belongs to wave filter technology field, be specifically related to a kind of double frequency cavity body filter, be applicable to GPS and Beidou satellite navigation system.
Background technology
Along with domestic Beidou satellite navigation system construction is day by day perfect, Beidou navigation application is more and more.Beidou satellite navigation system is China's global positioning satellite of developing voluntarily and communication system, all-weather, round-the-clock can provide high accuracy, highly reliable location, navigation, time service service for all types of user in the world, and tool short message communication capacity.
Big Dipper area navigation receiving system can support multimode multi-frequency, can compatible with GPS navigation satellite, thus realizes multiple satellite navigation system navigation feature.In multimode area navigation receiving system, radio-frequency front-end needs the filter of the multi-frequency such as compatible with GPS, the Big Dipper to realize the synthesis of satellite-signal and the suppression to unwanted signal.
Filtering device belongs to the front-end filtering device of telecommunication equipment, its basic function is the signal outside filtering useful band, because cavity body filter has the advantages that insertion loss is little, Out-of-band rejection is high, it is widely used filtering device in radio-frequency front-end, make radio-frequency front-end can obtain good noise factor, improve the signal to noise ratio of whole receiving system.
But current cavity body filter normally only can have good filter effect to a kind of navigation system of frequency, for the synthesis of the compatible satellite-signal of two kinds of different frequencies and poor to the inhibition of unwanted signal, actual needs cannot be met.
Summary of the invention
For the above Improvement requirement of prior art, the invention provides a kind of can compatible with GPS, Big Dipper operating frequency cavity body filter, it can the simultaneously compatible Big Dipper and gps satellite navigation system, realize the synthesis of two kinds of different frequency satellite-signals and the suppression to unwanted signal, accuracy rate is high, effective.
The concrete technical scheme that the present invention is adopted for achieving the above object is as follows:
One can compatible with GPS, the cavity body filter of Big Dipper operating frequency, it is characterized in that, comprise filtering body, resonator, coupling block, tuning screw, cover plate and radio frequency connector, wherein, described filtering body has internal cavity, described resonator and coupling block accommodating wherein and by described cover plate capping, passage between multiple described resonator is all-pass structure, each resonator arranges described coupling block each other, in order to strengthen the coupling between each resonator, described tuning screw to be arranged on filtering body and to be positioned at above resonator, described radio frequency connector is arranged on described filtering body.
As improvement of the present invention, between described resonator, have cross-couplings window.
As improvement of the present invention, this coupling block is square structure.
As improvement of the present invention, described resonator is disc structure, and center has circular hole, is convenient to mate with tuning screw to carry out tuning.
Filter of the present invention can compatible with GPS, Big Dipper operating frequency cavity body filter, it uses Chebyshev type wideband structural, achieves the relative bandwidth of about 30%, thus achieves the wide band cavity filter of the compatible Big Dipper and GPS frequency range.
In general, the above technical scheme conceived by the present invention compared with prior art, there is following beneficial effect: its operating frequency range of filter of the present invention can be 1258 ~ 1580MHz, cover Big Dipper B3:1268.52 ± 10.23MHz and GPS L1:1575.42 ± 1.023MHz, can be good at the double frequency cavity body filter realizing compatible with GPS, Big Dipper signal, there is good engineer applied and be worth.
Accompanying drawing explanation
Fig. 1 is the main TV structure schematic diagram according to the filter constructed by the embodiment of the present invention;
Fig. 2 is the side-looking structural representation according to the filter constructed by the embodiment of the present invention;
Fig. 3 is the perspective view according to the filter constructed by the embodiment of the present invention;
Fig. 4 is the structural representation of the resonator according to the filter constructed by the embodiment of the present invention;
Fig. 5 is the electric test figure according to the filter constructed by the embodiment of the present invention;
In all of the figs, identical Reference numeral represents same technical characteristic, particularly: 1 is cavity; 2 is resonator; 3 is coupling block; 4 is tuning screw; 5 is cross-couplings window between resonator; 6 is cover plate; 7 is radio frequency connector.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each execution mode of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
The compatible with GPS of the embodiment of the present invention and the double frequency cavity body filter of the Big Dipper comprise cross-couplings window 5, cover plate 6 and radio frequency connector 7 between cavity 1, resonator 2, coupling block 3, tuning screw 4, resonator.
Filtering body 1 has internal cavity, and resonator 2, coupling block 3 and cross-couplings window 5 are accommodating wherein also by cover plate 6 capping.Radio frequency connector 7 is arranged on outside described filtering body 1.Passage between multiple described resonator 2 is all-pass structure, and each resonator 2 is provided with coupling block 3 each other, in order to strengthen the coupling between each resonator.The center position that each resonator 2 surrounds has coupling window 5.
Preferably, resonator 2 tetrad also surrounds rectangle, and the center of each rectangle has a coupling window 5.
Resonator 2 preferably uses circular pan-like structure, and the passage between resonator 2 is all-pass structure, uses square coupling block 3 to realize broadband couple device, to strengthen the coupling between resonator, thus realize wideband filtered performance between resonator.
Product index debugging is realized by the coupling screws between tuning screw 4 resonator 2 above resonator 2.
Double frequency cavity body filter carries out cascade by the resonator 2 in cavity 1 by coupling block 3, thus realize broadband filter structure, product is adjusted by tuning screw 4 pairs of electric properties, and the radio-frequency (RF) index such as Insertion Loss, Out-of-band rejection in the standing wave of product, band is satisfied the demands.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. one kind can compatible with GPS, the cavity body filter of Big Dipper operating frequency, it is characterized in that, comprise filtering body (1), resonator (2), coupling block (3), tuning screw (4), cover plate (6) and radio frequency connector (7), wherein, described filtering body (1) has internal cavity, described resonator (2) and coupling block (3) accommodating wherein and by described cover plate (6) capping, passage between multiple described resonator (2) is all-pass structure, each resonator (2) arranges described coupling block (3) each other, in order to strengthen the coupling between each resonator, described tuning screw (4) to be arranged on filtering body 1 and to be positioned at above resonator, described radio frequency connector (7) is arranged on described filtering body (1).
2. according to claim 1 a kind of can compatible with GPS, Big Dipper operating frequency cavity body filter, it is characterized in that, between described resonator (2), have cross-couplings window (5).
3. according to claim 1 and 2 a kind of can compatible with GPS, Big Dipper operating frequency cavity body filter, it is characterized in that, this coupling block (3) is square structure.
4. according to any one of claim 1-3 a kind of can compatible with GPS, Big Dipper operating frequency cavity body filter, it is characterized in that, described resonator (2) is disc structure, and center has circular hole, is convenient to mate with tuning screw (4) to carry out tuning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410606432.7A CN104319444B (en) | 2014-10-31 | 2014-10-31 | Double-frequency cavity filter compatible to working frequencies of GPS and Beidou |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410606432.7A CN104319444B (en) | 2014-10-31 | 2014-10-31 | Double-frequency cavity filter compatible to working frequencies of GPS and Beidou |
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| Publication Number | Publication Date |
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| CN104319444A true CN104319444A (en) | 2015-01-28 |
| CN104319444B CN104319444B (en) | 2017-04-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113691325A (en) * | 2021-10-27 | 2021-11-23 | 天津讯联科技有限公司 | Satellite-borne short message cavity filter thermal vacuum experiment test system and method |
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| CN201436696U (en) * | 2009-05-14 | 2010-04-07 | 南京广顺网络通信设备有限公司 | A CDMA+GSM+3G/DCS1800 dual frequency combiner |
| US20100278197A1 (en) * | 2007-03-12 | 2010-11-04 | Comba Telecom System (China) Ltd. | Double frequency combiner |
| CN202339971U (en) * | 2012-01-05 | 2012-07-18 | 东莞洲亮通讯科技有限公司 | A multi-band integrated cross-coupled combiner filter |
| CN202695684U (en) * | 2012-07-16 | 2013-01-23 | 苏州市大富通信技术有限公司 | Cavity filter |
| CN202839912U (en) * | 2012-09-21 | 2013-03-27 | 武汉凡谷电子技术股份有限公司 | Filter coupling structure |
| CN103490128A (en) * | 2011-05-19 | 2014-01-01 | Ace技术株式会社 | Multi mode filter for realizing wide band using capacitive coupling / inductive coupling and capable of tuning coupling value |
| CN203521566U (en) * | 2013-09-23 | 2014-04-02 | 南京广顺网络通信设备有限公司 | A dual-frequency high intermodulation waterproof combiner |
| CN203826528U (en) * | 2014-04-17 | 2014-09-10 | 南京广顺网络通信设备有限公司 | 640-1850 MHz /WCDMA/LTE triple frequency combiner |
-
2014
- 2014-10-31 CN CN201410606432.7A patent/CN104319444B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6392506B2 (en) * | 1999-12-06 | 2002-05-21 | Kathrein, Inc. | Receive/transmit multiple cavity filter having single input/output cavity |
| US20100278197A1 (en) * | 2007-03-12 | 2010-11-04 | Comba Telecom System (China) Ltd. | Double frequency combiner |
| CN201332130Y (en) * | 2009-01-13 | 2009-10-21 | 南京广顺网络通信设备有限公司 | DCS1800/PHS double-frequency mixer |
| CN201436696U (en) * | 2009-05-14 | 2010-04-07 | 南京广顺网络通信设备有限公司 | A CDMA+GSM+3G/DCS1800 dual frequency combiner |
| CN103490128A (en) * | 2011-05-19 | 2014-01-01 | Ace技术株式会社 | Multi mode filter for realizing wide band using capacitive coupling / inductive coupling and capable of tuning coupling value |
| CN202339971U (en) * | 2012-01-05 | 2012-07-18 | 东莞洲亮通讯科技有限公司 | A multi-band integrated cross-coupled combiner filter |
| CN202695684U (en) * | 2012-07-16 | 2013-01-23 | 苏州市大富通信技术有限公司 | Cavity filter |
| CN202839912U (en) * | 2012-09-21 | 2013-03-27 | 武汉凡谷电子技术股份有限公司 | Filter coupling structure |
| CN203521566U (en) * | 2013-09-23 | 2014-04-02 | 南京广顺网络通信设备有限公司 | A dual-frequency high intermodulation waterproof combiner |
| CN203826528U (en) * | 2014-04-17 | 2014-09-10 | 南京广顺网络通信设备有限公司 | 640-1850 MHz /WCDMA/LTE triple frequency combiner |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113691325A (en) * | 2021-10-27 | 2021-11-23 | 天津讯联科技有限公司 | Satellite-borne short message cavity filter thermal vacuum experiment test system and method |
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| CN104319444B (en) | 2017-04-19 |
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