CN1112296A - Microwave interdigitated low-resistance filter - Google Patents
Microwave interdigitated low-resistance filter Download PDFInfo
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- CN1112296A CN1112296A CN 95102246 CN95102246A CN1112296A CN 1112296 A CN1112296 A CN 1112296A CN 95102246 CN95102246 CN 95102246 CN 95102246 A CN95102246 A CN 95102246A CN 1112296 A CN1112296 A CN 1112296A
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Abstract
The microwave interdigital low-resistance filter is a sealed rectangular cavity made of 6 square red copper plates, in which there are 7 coupled resonant red copper rods and coaxial 7 coupled resonant red copper screw bolt. Its input and output are introduced in at side plate near grounding terminal. It has advantages of small size, easy regulation, shift range of central frequency up to 150 MHz, 60dB out-band suppression and 0.7dB in-band insertion loss.
Description
The present invention relates to a kind of filter, particularly relate to a kind of structural design that is used for the interdigitated low-resistance band pass filter of microwave.
Microwave filter is a kind of purposes microwave device quite widely.In order to satisfy various purposes, people have developed the microwave filter of numerous species type, and interdigitated low-resistance filter is wherein a kind of band pass filter.Because little, the sound construction of this filter volume does not have supporting dielectric again, in-band insertion loss is less, adds that its utility theory and practice are all quite ripe, so obtained using widely in 1～10GHZ frequency range.But present microwave interdigitated filter all is to adopt the monoblock alloy aluminum to be processed to form box-like cavity through milling usually, and tens～twenties resonance screw rods are installed on the lower side panel nearly thereon form, so its relative overall dimensions are bigger.The centre frequency of this filter can the scope of moving be 50MHZ, and outer inhibition of its band is 40dB, the about 2dB of Insertion Loss in the band, and such parameter index still can not satisfy Communication Development demand with rapid changepl. never-ending changes and improvements sometimes.
The purpose of this invention is to provide that a kind of performance index are more good, the interdigitated low-resistance filter of architecture advances.
The present invention is achieved in that several coupled resonance screw rods and the resonance round bar that includes the airtight cavity of the rectangle made from sheet metal and settle in cavity, it is characterized in that: the airtight cavity of this rectangle is by up and down two cover plates and a left side, right, before, four sides totally six blocks of rectangle sheet materials in back constitute with the bolted combination, on the biside plate 7 resonance screw rod and resonance round bars of regulating the passband frequency are installed altogether up and down in this cavity, about be respectively equipped with one on two side plates and regulate the resonance screw rod of input and output impedance matching and be used to install its input, the through hole of output cable joint and fixing threaded hole, and its input all inserts from the side plate of line end closely with output.The interior side external surface of six blocks of rectangle sheet materials of above-mentioned formation seal chamber requires smooth, and its fineness should be not less than
7.Above-mentioned six blocks of rectangle sheet materials and coupled resonance round bar, screw rod all should be selected electrolysis red copper material for use.The geometric accuracy of above-mentioned each parts should be not less than 0.1 millimeter, and wherein the installing hole geometric accuracy of resonant rod should be not less than 0.05 millimeter, to guarantee the precision of its band connection frequency.The length of resonance round bar should be 7/32 λ.
Characteristics of the present invention are that its resonant cavity is abandoned original employing monoblock aluminium alloy is processed to form box-like cavity through milling original method, but adopt six to have very through attrition process, its inner surface that the electrolysis copper plate assembly of high-flatness and surface smoothness forms, make stock utilization improve 60～80%, reduced manufacturing cost; And resonance screw rod and resonance round bar also adopt electrolysis red copper material, and the electric property of this filter is greatly improved.Because the resonant cavity outside has only 7 adjusting screw(rod)s, makes the volume-diminished of filter, and significantly reduced and debug workload and improved product percent of pass.In addition, owing to adopt the near end coupling, changed output in the past and gone into signal from far holding the mode of coupling, and resonance round bar length also changes 7/32 λ into from the conventional lengths of 1/4 λ, make centre frequency of the present invention the scope of moving to reach 150MHZ, the outer inhibition of its band can reach 60dB, and Insertion Loss can be no more than 0.7dB in the band, ripple is less than 0.1dB in the band, the overall dimensions of filter are dwindled greatly, and, be convenient to tissue and produce in batches for the uplink and downlink filter of microwave transmitting and receiving equipment adopts the filter of same contour structure size that possibility is provided.
Below in conjunction with drawings and Examples, specifically introduce structure of the present invention and application thereof.
Fig. 1 is the resonant cavity inner structure schematic diagram of one embodiment of the present of invention
Fig. 2 is that (wherein A is a front view, and B is a vertical view for the schematic diagram of the cover plate up and down of one embodiment of the present of invention.）
Fig. 3 is that (wherein A is a front view, and B is a vertical view for the schematic diagram of the front and back side plate of one embodiment of the present of invention.）
Referring to Fig. 1, Fig. 2 and Fig. 3, the present invention is that an airtight cavity made from sheet metal 1 of rectangle and several coupled resonance screw rods of settling in cavity are formed, the airtight cavity 1 of this rectangle by four blocks of side plates 4,5,6,7 of two cover plates 2,3 and left, right, front and rear four sides up and down totally six blocks of rectangle sheet materials constitute with the bolted combination.The inner surface of these six rectangle sheet materials requires have very high evenness and surface smoothness (to be not less than
7),, reduce the electro magnetic in the cavity to guarantee the sealing property and the low insertion loss of cavity as far as possible.On former and later two side plates 4,5 of this cavity 1 inner chamber, 7 resonance screw rods 10～16 of regulating the passband frequency are installed altogether, on the same axis and former and later two side plates 4,5 corresponding of these 7 resonance screw rods with it, also be installed with 7 resonance round bars 20～26, constitute 7 rank interdigitated band pass filters thus.As for the physical dimension of these resonance round bars, installation site and and the resonance screw rod between the gap, then all determined by relevant theoretical calculation formula.Just wherein the length of resonance round bar should be 7/32 λ, is not 1/4 conventional λ.The geometric accuracy error that should require usually respectively to form member should be no more than 0.1 millimeter, and wherein the installing hole precision of 7 resonant rods and resonance screw rod should error be no more than 0.05 millimeter.About be respectively equipped with for the resonance screw rod 17,18 of regulating input, output impedance coupling on two side plates 6,7 and be used to install the through hole 19,29 of its input, output cable joint and at the fixing threaded hole 41,42 and 43,44 of these through hole both sides about in the of 19,29.Another characteristics of the present invention are that its signal input output end all inserts from the near end.Referring to one embodiment of the present of invention shown in Figure 1, axis hole 19 distances of input cable joint have only 9 millimeters as the front side board 4 of ground wire.
The method of adjustment of each resonance round bar and resonance screw rod all is as good as substantially with conventional interdigital filter in operation principle of the present invention, designing and calculating and the resonant cavity.Microwave signal available standards cable joint (SMA-50KF standard cable seat as shown in Figure 1) first resonance round bar 20 in axis hole 19 feed-ins resonant cavity 1 of the present invention of input, adjust the resonance screw rod 10 of these resonance round bar 20 tops and the gap between the resonance round bar 20 then, make it a bit in passband of resonance, fix the position of this resonance screw rod 10 again with nut 30.Signal is coupled to resonance round bar 21 through cavity space, the same with said method, adjust the resonance screw rod 11 of these round bar 21 belows and its gap size again, also make it on resonance another dot frequency in passband, and fix the position of this screw rod 11 with nut 31 ... thus 7 resonance screw rods 10～16 are all mixed up.When tuning, the resonance point of each resonance screw rod is evenly distributed, in the whole free transmission range of filter so that obtain the optimum filtering curve.Draw through the output cable that the present invention filtered signal through hole 29 from its right plate is installed.
The present invention implements on the mobile phone communications direct amplification machine equipment of applicant's development, in the amplification link of uplink and downlink signal, is serially connected with three three grades of filters that adopt the present invention to constitute respectively in this equipment, is used for strict restriction uplink and downlink signals path.The mechanical structure of these six filters, overall dimension all are identical, just change its band connection frequency, make it to work in respectively upward signal (890～915MHZ) amplification links or downstream signal (935～960MHZ) the amplification links of mobile phone by changing its 7 resonance screw rods.After above-mentioned three grades of filters serial connection, the outer total attenuation of its band can reach-180dB, surpassing external product single-stage attenuation has only-the 40dB level, be that above-mentioned mobile phone communications direct amplification machine can overcome the technical barrier that power is big, back coupling is strong, directly amplify the critical component of mobile phone uplink and downlink signals, and the filter mechanical structure of uplink and downlink signals is in full accord, also provides condition for producing, reduce manufacturing cost in batches.
Claims (5)
1, a kind of microwave interdigitated low-resistance filter, several coupled resonance screw rods and the resonance round bar that include the airtight cavity of the rectangle made from sheet metal and in cavity, settle, it is characterized in that: the airtight cavity of this rectangle be by two cover plates up and down and about, before and after four sides totally six blocks of rectangle sheet materials constitute with the bolted combination, on the biside plate 7 resonance screw rods of regulating the passband frequency are installed altogether up and down in this cavity, about be respectively equipped with one on two side plates and regulate the resonance screw rod of input and output impedance matching and be used to install its input, the through hole of output cable joint and fixing threaded hole, and its input all inserts from the side plate of line end closely with output.
2, microwave interdigitated low-resistance filter as claimed in claim 1 is characterized in that: the interior side external surface of six blocks of rectangle sheet materials of above-mentioned formation seal chamber requires smooth, and its fineness should be not less than
7.
3, microwave interdigitated low-resistance filter as claimed in claim 1 is characterized in that: above-mentioned six blocks of rectangle sheet materials and coupled resonance round bar, screw rod all should be selected electrolysis red copper material for use.
4, as claim 1 or 3 described microwave interdigitated low-resistance filters, it is characterized in that: the geometric accuracy of above-mentioned six rectangular slabs and coupled resonance round bar, screw rod should be not less than 0.1 millimeter, and wherein the installing hole geometric accuracy of resonance round bar and resonance screw rod should be not less than 0.05 millimeter.
5, microwave interdigitated low-resistance filter as claimed in claim 1 is characterized in that: the length of above-mentioned coupled resonance round bar should be 7/32 λ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95102246 CN1036818C (en) | 1995-03-15 | 1995-03-15 | Microwave interdigitated low-resistance filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95102246 CN1036818C (en) | 1995-03-15 | 1995-03-15 | Microwave interdigitated low-resistance filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1112296A true CN1112296A (en) | 1995-11-22 |
| CN1036818C CN1036818C (en) | 1997-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95102246 Expired - Fee Related CN1036818C (en) | 1995-03-15 | 1995-03-15 | Microwave interdigitated low-resistance filter |
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| CN (1) | CN1036818C (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986459A (en) * | 2010-11-04 | 2011-03-16 | 惠明 | Combiner for ultra-wideband wireless communication |
| CN102790249A (en) * | 2012-09-11 | 2012-11-21 | 成都赛纳赛德科技有限公司 | Compact interdigital filter |
| CN102820505A (en) * | 2012-09-11 | 2012-12-12 | 成都赛纳赛德科技有限公司 | Miniaturization narrow-band filter |
| CN103311616A (en) * | 2012-03-15 | 2013-09-18 | 成都赛纳赛德科技有限公司 | Small interdigital filter |
| CN105655675A (en) * | 2016-04-11 | 2016-06-08 | 丹阳华神电器有限公司 | Design method of interdigital band-pass filter |
| CN107623158A (en) * | 2017-09-06 | 2018-01-23 | 南京理工大学 | A kind of Ku band broadbands interdigital filter |
| WO2018090618A1 (en) * | 2016-11-15 | 2018-05-24 | 北京北方华创微电子装备有限公司 | Microwave transmission apparatus and semiconductor processing device |
| CN109004329A (en) * | 2018-08-01 | 2018-12-14 | 中国科学院苏州纳米技术与纳米仿生研究所 | Resonator based on all-metal plate resonant cavity |
| CN109004328A (en) * | 2018-08-01 | 2018-12-14 | 中国科学院苏州纳米技术与纳米仿生研究所 | Resonator based on full composite board cavity |
| CN109103559A (en) * | 2018-08-01 | 2018-12-28 | 中国科学院苏州纳米技术与纳米仿生研究所 | resonator |
| CN110459847A (en) * | 2019-08-02 | 2019-11-15 | 成都理工大学 | The interdigital bandpass filter of electromagnetic coupling and design method based on multi-through hole |
-
1995
- 1995-03-15 CN CN 95102246 patent/CN1036818C/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986459A (en) * | 2010-11-04 | 2011-03-16 | 惠明 | Combiner for ultra-wideband wireless communication |
| CN101986459B (en) * | 2010-11-04 | 2013-11-13 | 惠明 | Combiner for ultra-wideband wireless communication |
| CN103311616A (en) * | 2012-03-15 | 2013-09-18 | 成都赛纳赛德科技有限公司 | Small interdigital filter |
| CN102790249A (en) * | 2012-09-11 | 2012-11-21 | 成都赛纳赛德科技有限公司 | Compact interdigital filter |
| CN102820505A (en) * | 2012-09-11 | 2012-12-12 | 成都赛纳赛德科技有限公司 | Miniaturization narrow-band filter |
| CN102790249B (en) * | 2012-09-11 | 2014-06-11 | 成都赛纳赛德科技有限公司 | Compact interdigital filter |
| CN105655675A (en) * | 2016-04-11 | 2016-06-08 | 丹阳华神电器有限公司 | Design method of interdigital band-pass filter |
| WO2018090618A1 (en) * | 2016-11-15 | 2018-05-24 | 北京北方华创微电子装备有限公司 | Microwave transmission apparatus and semiconductor processing device |
| US10937633B2 (en) | 2016-11-15 | 2021-03-02 | Beijing Naura Microelectronics Equipment Co., Ltd. | Microwave transmission apparatus and semiconductor processing device |
| CN107623158A (en) * | 2017-09-06 | 2018-01-23 | 南京理工大学 | A kind of Ku band broadbands interdigital filter |
| CN109004329A (en) * | 2018-08-01 | 2018-12-14 | 中国科学院苏州纳米技术与纳米仿生研究所 | Resonator based on all-metal plate resonant cavity |
| CN109004328A (en) * | 2018-08-01 | 2018-12-14 | 中国科学院苏州纳米技术与纳米仿生研究所 | Resonator based on full composite board cavity |
| CN109103559A (en) * | 2018-08-01 | 2018-12-28 | 中国科学院苏州纳米技术与纳米仿生研究所 | resonator |
| CN110459847A (en) * | 2019-08-02 | 2019-11-15 | 成都理工大学 | The interdigital bandpass filter of electromagnetic coupling and design method based on multi-through hole |
| CN110459847B (en) * | 2019-08-02 | 2021-04-20 | 成都理工大学 | Electromagnetic coupling interdigital band-pass filter based on multiple through holes and design method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1036818C (en) | 1997-12-24 |
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