CN1036818C - Microwave interdigitated low-resistance filter - Google Patents
Microwave interdigitated low-resistance filter Download PDFInfo
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- CN1036818C CN1036818C CN 95102246 CN95102246A CN1036818C CN 1036818 C CN1036818 C CN 1036818C CN 95102246 CN95102246 CN 95102246 CN 95102246 A CN95102246 A CN 95102246A CN 1036818 C CN1036818 C CN 1036818C
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Abstract
The present invention relates to a microwave interdigitated low-resistance filter which is composed of a rectangular sealing cavity, wherein the rectangular sealing cavity is combined by six rectangular plates and is fastened by bolts, seven coupled resonance round rods and seven coaxial coupled resonance screw rods are arranged in the cavity. An input and an output ends are both accessed from a side plate point near a grounding end, the rectangular plates, the resonance round rods and the resonance screw rods are all made of red copper with high dimensional precision, the rectangular cavity is sealed according to requirements so as to eliminate electric wave leakage. The filter has the advantages of small size, low debugging workload and good performance, a central frequency movable range of the filter can reach 150 MHz, out-band suppression is 60 dB, and in-band insertion loss is not larger than 0.7 dB.
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, there is not supporting dielectric again, in-band insertion loss is less, add 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, the airtight cavity of this rectangle by up and down two cover plates and left, right, front and rear four sides totally six blocks of rectangle sheet materials with the bolted combination and constitute, about be respectively equipped with a through hole and the fixing threaded hole regulating the resonance screw rod of input and output impedance matching and be used to install its input, output cable joint on two side plates, and its input and output all insert from the side plate of line end closely; It is characterized in that: be separately installed with 7 coupled resonance screw rod and resonance round bars of regulating the passband frequency on the biside plate up and down in this cavity, wherein the length of resonance round bar should be 7/32 λ.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.
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, not only save non-ferrous metal, more make centre frequency of the present invention can the scope of moving to enlarge from the 30MHZ of routine and 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, thereby the overall dimensions of filter are dwindled greatly, and be microwave transmitting and receiving equipment on, downstream filter adopts same appearance structure size filtering device that possibility is provided, and is convenient to tissue and produces in batches.
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 the schematic diagram (wherein A is a front view, and B is a vertical view) of the cover plate up and down of one embodiment of the present of invention.
Fig. 3 is the schematic diagram (wherein A is a front view, and B is a vertical view) 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 and right forward and backward 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 to have very high evenness and surface smoothness (being not less than 7).To guarantee the sealing property and the low insertion loss of cavity, reduce the electro magnetic in the 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 gap between the resonance screw rod 10 resonance round bars 20 of these resonance round bar 20 tops 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, physical 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 for producing in batches, reducing manufacturing cost provides condition.
Claims (1)
1. 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, the airtight cavity of this rectangle by two cover plates up and down and about, front and back four sides totally six blocks of rectangle sheet materials constitute with bolted, about be respectively equipped with a through hole and the fixing threaded hole regulating the resonance screw rod of input and output impedance matching and be used to install its input, output cable joint on two side plates, and its input and output all insert from the side plate of line end closely; It is characterized in that: be separately installed with 7 coupled resonance screw rod and resonance round bars of regulating the passband frequency on the biside plate up and down in this cavity, wherein the length of 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 CN1112296A (en) | 1995-11-22 |
| CN1036818C true 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) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102790249B (en) * | 2012-09-11 | 2014-06-11 | 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 |
| 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 |
| CN108074789B (en) * | 2016-11-15 | 2019-10-11 | 北京北方华创微电子装备有限公司 | A kind of microwave transmission unit and semiconductor processing equipment |
| CN107623158A (en) * | 2017-09-06 | 2018-01-23 | 南京理工大学 | A kind of Ku band broadbands interdigital filter |
| 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 |
| 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 |
| 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 |
| 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 |
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1995
- 1995-03-15 CN CN 95102246 patent/CN1036818C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1112296A (en) | 1995-11-22 |
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