CN103474729A - Multi-frequency band elimination filter - Google Patents
Multi-frequency band elimination filter Download PDFInfo
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- CN103474729A CN103474729A CN2013104569303A CN201310456930A CN103474729A CN 103474729 A CN103474729 A CN 103474729A CN 2013104569303 A CN2013104569303 A CN 2013104569303A CN 201310456930 A CN201310456930 A CN 201310456930A CN 103474729 A CN103474729 A CN 103474729A
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Abstract
The invention relates to the technical field of microwave communication, and discloses a multi-frequency band elimination filter. The filter comprises an input port, an output port, a waveguide transmission line and a plurality of filter bodies. The filter bodies are coupled with the two sides of the waveguide transmission line respectively, and the filter bodies are composed of resonators with the same resonance frequency or different resonance frequencies. Compared with a traditional band elimination filter which is formed by arranging resonators in a linear mode, the multi-frequency band elimination filter has the advantages that the structure is compact and novel, and due to the fact that the resonators with the same resonance frequency or different resonance frequencies to be arranged on the two sides of the waveguide transmission line in a coupled window mode, the sizes of devices in the system are effectively reduced, a plurality of useless frequency band signals can be also blocked, and the performance is greatly optimized.
Description
Technical field
The present invention relates to technical field of micro communication, particularly a kind of multifrequency band stop filter.
Background technology
Microwave filter has the important function such as frequency-selecting, frequency division and isolation signals, in the systems such as modern microwave millimetre-wave attenuator, satellite communication, remote sensing and Radar Technology, is widely used, and the quality of its performance will directly have influence on the running quality of whole system.According to the difference of passband, microwave filter can be divided into low pass, band is logical, band hinders, high pass filter.Wherein, band stop filter is a kind of as microwave filter, in communication system, also plays a very important role.Usually in many microwave systems, while requiring the signal transmission, decay should be as much as possible little, to unwanted noise, interference, spuious etc., will curb, and needs to have the very high degree of decay.Band stop filter is applicable in wide frequency range filtering arrowband frequently, suppress the scattering frequency spectrum of high power transmitter, nonlinear power amplifier and the parasitic passband of band pass filter etc. in wireless communication system, at this moment, as adopt one or several band stop filter to suppress them, just than the wide stopband that adopts band pass filter, suppress more flexibly effectively.Therefore, many band stop filters mainly are designed to the single-frequency filter.But, in some present communication system, needing to block the unwanted signal of two or more frequency bands, this just needs again development and Design double frequency or multifrequency band stop filter to realize this function.
As shown in Figure 1, traditional band stop filter project organization is generally the stub resonator that adopts 1/4 wavelength, and forms along main waveguide transmission line word order, and the odd-multiple that is spaced apart 1/4 wavelength between resonator.If realize the band inhibition effect of a plurality of frequencies, the band stop filter of a plurality of these spline structures that need to connect, its volume and quantity are extremely huge.And simple series connection can directly cause the hydraulic performance decline of filter, finally cause the performance of whole system to reduce.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of multifrequency band stop filter, traditional in realizing the band inhibition effect of a plurality of frequencies to solve, need the band stop filter quantity of series connection many, bulky, cause the problem of the hydraulic performance decline of performance of filter and whole communication system.
For solving the problems of the technologies described above, the invention provides a kind of multifrequency band stop filter, comprise: input port, output port, waveguide transmission line and a plurality of filter, wherein, each described filter is coupled in respectively the both sides of described waveguide transmission line, and each described filter forms for the resonator by identical or different resonance frequency.
Preferably, described filter has different stopband range.
Preferably, form the resonator number of each described filter identical or different.
Preferably, described resonator adopts the mode of window coupling and/or slot-coupled, with described waveguide transmission line, carries out the electromagnetic energy coupling.
Preferably, described resonator is cavity resonator, micro-strip resonantor or dielectric resonator.
Preferably, described waveguide transmission line adopts waveguide structure, substrate integrated wave guide structure or microstrip structure.
Preferably, described input port and described output port are furnished with joint, and described joint adopts waveguide flange, SMA shape or N shape structure, on described joint, also is provided with and draws metal probe.
Preferably, when adopting waveguide structure, the material of described waveguide is one or more in aluminium, aluminium alloy, copper, steel.
Compared with prior art, multifrequency band stop filter provided by the present invention has reached following technique effect:
1) the present invention is coupled with the resonator of a plurality of identical or different resonance frequencys on waveguide transmission line, produces trap characteristic, can block a plurality of useless band signals, thereby realizes the inhibition of unwanted signal and the transmission effects of useful signal.
2) multifrequency band stop filter structure of the present invention is compact novel, has effectively reduced the volume of device in the system, has realized function and the Miniaturization Design of multifrequency band stop filter, and performance has also obtained optimization, can be widely used in various military, commercial signal communication systems.
The accompanying drawing explanation
Fig. 1 is the multifrequency band stop filter structure schematic diagram that prior art adopts.
The structural representation that Fig. 2 is multifrequency band stop filter of the present invention.
The structural representation of the multifrequency band stop filter that Fig. 3 is the described employing window of embodiment of the present invention coupled modes.
Embodiment
Censure specific components as used some vocabulary in the middle of specification and claim.Those skilled in the art should understand, and hardware manufacturer may be called same assembly with different nouns.This specification and claims are not used as distinguishing the mode of assembly with the difference of title, but the difference on function is used as the criterion of distinguishing with assembly.As " comprising " mentioned in the middle of specification and claim in the whole text is an open language, therefore should be construed to " including but not limited to "." roughly " refer in acceptable error range, those skilled in the art can solve the technical problem in the certain error scope, substantially reach described technique effect.The specification subsequent descriptions is for implementing better embodiment of the present invention, and right described description is to illustrate that rule of the present invention is purpose, not in order to limit scope of the present invention.Protection scope of the present invention is as the criterion when looking the claims person of defining.
Below in conjunction with accompanying drawing, the present invention is described in further detail, but not as a limitation of the invention.
In microwave communication, the electromagnetic wave guided wave system is two-wire line, mainly is used in the occasion that frequency is lower.At microwave frequency band, be decimeter range and superhigh frequency band, it is feasible and easily transmitting electromagnetic wave with the metal tube of a hollow, but can not propagate TEM(Transverse Electric and Magnetic field in blank pipe, transverse electric and magnetic field) pattern, therefore adopt TE(Transverse Electric wave, H mode) pattern or TM(Transverse Magnetic wave, transverse magnetic wave) pattern, Here it is metal waveguide (or being called waveguide).The sectional area size that has arrived short millimeter band and sub-micro millimere-wave band metal waveguide is too little, and processing is difficult for, and therefore adopts dielectric waveguide as transmission system.Fiber medium has become the Main Means of transmission electromagnetic signal now, but for the boundary condition of realizing approx short circuit face can be the boundary face that metal forms with the conductor with high conductivity, the same like this metal waveguide that formed.Metal waveguide can consist of a waveguide, also can consist of many waveguides.
As shown in Figure 2, for the designed a kind of multifrequency band stop filter of the present invention, it comprises, input port, output port, for waveguide transmission line and a plurality of filter of signal transmission, wherein, each described filter is located at respectively the both sides of described waveguide transmission line.Described filter has different stopband range, can block the unwanted signal of a plurality of different frequency bands.Described filter further rearranges for the resonator by a plurality of identical or different resonance frequencys.
Further, the number of resonators in each filter is the requirement for the band resistance according to the scope of their frequency bands and system, can be set to identical also can be different.Please refer to again the embodiment of Fig. 2, wherein, first stop-band filter is rearranged by K resonator, second stop-band filter rearranged by L resonator, by that analogy, M stop-band filter is comprised of M filter, and N stop-band filter arranged and formed by N filter, and they are located at respectively the both sides of waveguide transmission line.
Each resonator adopts the mode of window coupling and/or slot-coupled, with described waveguide transmission line, carries out the electromagnetic energy coupling, produces trap characteristic, eliminates the interference to certain or some characteristic frequency.The transmission structure mode of described waveguide transmission line can adopt waveguide structure, substrate integrated wave guide structure or microstrip structure.When transmission line adopts waveguide structure or substrate integrated wave guide structure to carry out the signal transmission, between described resonator and waveguide transmission line, adopt the window coupled modes better, the coupling of windowing; When waveguide transmission line adopt be microstrip structure the time, adopt the mode of slot-coupled better, utilize less gap fluting area to obtain larger coupling energy.Certainly, waveguide transmission line also can adopt other any can carrying out with the structure of electromagnetic transmission mode.For waveguide structure, can adopt the materials processings such as aluminium, aluminium alloy, copper, steel, and the modes such as employing is milled, die casting, line cutting shape; For substrate integrated wave guide structure and microstrip structure, adopt the sheet material of differing dielectric constant to form by electrochemical corrosion and machining, its surface treatment can adopt electric conductive oxidation, silver-plated, copper facing, the mode such as gold-plated, to reduce the electromagnetic wave propagation loss.
Resonator in the present invention can be cavity resonator, micro-strip resonantor and/or dielectric resonator.Wherein, metal waveguide and resonant cavity are widely used in decimeter wave, centimeter wave and longer millimere-wave band.In short millimeter band and submillimeter region, because the size of metal waveguide and resonant cavity is too little, be difficult to manufacture, and, at infrared band or visible light wave range, when wavelength is micron dimension, applied metal waveguide or resonant cavity are more impossible.Now, dielectric resonator has that volume is little, lightweight, and quality factor are high, and the advantages such as good stability are convenient to be applied in microstrip circuit or microwave integrated circuit and millimere-wave band especially.
On described input/output end port, can also configure joint, described joint adopts waveguide flange, SMA shape, N shape structure or other structures, on described joint, also can draw metal probe.
For multifrequency band stop filter of the present invention, in the final electrical property optimizing phase, can adopt all-wave or Plane electromagnetic field simulation software to be optimized design.
Coordinate and consult Fig. 3, the embodiment that Fig. 3 is multifrequency band stop filter of the present invention.
In embodiments of the present invention, the mode be coupled by window on the both sides of waveguide transmission line 10 is coupled with three groups of filters, the middle less coupling window 101 that forms, they have three different stopband range, wherein, the filter 11 of stopband one is comprised of two resonators, the filter of stopband 2 12 also is comprised of two resonators, the filter 13 of stopband three is comprised of three resonators, the filter of stopband one and stopband two is located at wherein one side of waveguide transmission line 10, and the filter of stopband three is located at another side.Waveguide transmission line now should be adopted as substrate integrated wave guide structure or waveguide structure.The size of each resonator and the size of coupling window also can be done different adjustment.
Signal is inputted from input port, while being transmitted on waveguide transmission line 10, window 101 by coupling, the filter of each different band resistance will decay to extremely low-level to the frequency component of some scope of correspondence, thereby those useless noise signals of filtering, make the signal that only is in the frequency in some scope needed normally pass through and to export.
With the band stop filter that traditional word order forms, compare, multifrequency band stop filter structure of the present invention is compact novel, the resonator of a plurality of identical or different resonance frequencys is located to the both sides of waveguide transmission line with the form of coupling window, both effectively reduced the volume of device in the system, also can block a plurality of useless band signals, performance has also obtained great optimization.
Above-mentioned explanation illustrates and has described some preferred embodiments of the present invention, but as previously mentioned, be to be understood that the present invention is not limited to the disclosed form of this paper, should not regard the eliminating to other embodiment as, and can be used for various other combinations, modification and environment, and can, in invention contemplated scope described herein, by technology or the knowledge of above-mentioned instruction or association area, be changed.And the change that those skilled in the art carry out and variation do not break away from the spirit and scope of the present invention, all should be in the protection range of claims of the present invention.
Claims (8)
1. a multifrequency band stop filter, it is characterized in that, comprise: input port, output port, waveguide transmission line and a plurality of filter, wherein, each described filter is coupled in respectively the both sides of described waveguide transmission line, and each described filter forms for the resonator by identical or different resonance frequency.
2. multifrequency band stop filter as claimed in claim 1, is characterized in that, described filter has different stopband range.
3. multifrequency band stop filter as claimed in claim 1, is characterized in that, the resonator number that forms each described filter is identical or different.
4. multifrequency band stop filter as claimed in claim 3, is characterized in that, described resonator adopts the mode of window coupling and/or slot-coupled, with described waveguide transmission line, carries out the electromagnetic energy coupling.
5. multifrequency band stop filter as described as claim 3 or 4, is characterized in that, described resonator is cavity resonator, micro-strip resonantor or dielectric resonator.
6. multifrequency band stop filter as claimed in claim 1, is characterized in that, described waveguide transmission line adopts waveguide structure, substrate integrated wave guide structure or microstrip structure.
7. multifrequency band stop filter as claimed in claim 1, is characterized in that, described input port and described output port are furnished with joint, and described joint adopts waveguide flange, SMA shape or N shape structure, on described joint, also is provided with and draws metal probe.
8. multifrequency band stop filter as claimed in claim 6, is characterized in that, when adopting waveguide structure, the material of described waveguide is one or more in aluminium, aluminium alloy, copper, steel.
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| CN2013104569303A CN103474729A (en) | 2013-09-29 | 2013-09-29 | Multi-frequency band elimination filter |
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| CN2013104569303A CN103474729A (en) | 2013-09-29 | 2013-09-29 | Multi-frequency band elimination filter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078726A (en) * | 2014-06-04 | 2014-10-01 | 中国电子科技集团公司第十研究所 | Parallel connection type unilateral elliptic function transmission line filter |
| CN106816675A (en) * | 2017-03-10 | 2017-06-09 | 京信通信系统（中国）有限公司 | Cavity type bandstop filter and radio-frequency devices |
| CN111970727A (en) * | 2020-07-15 | 2020-11-20 | 国家无线电监测中心检测中心 | NB-IoT base station blocking test system |
| WO2021077379A1 (en) * | 2019-10-24 | 2021-04-29 | 华为技术有限公司 | Band-stop filter and electronic device |
| CN114914646A (en) * | 2022-05-12 | 2022-08-16 | 安徽阖煦微波技术有限公司 | Band elimination filter of standard waveguide port |
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| JP2002135004A (en) * | 2000-10-27 | 2002-05-10 | Shimada Phys & Chem Ind Co Ltd | High-frequency filter |
| EP1235297A2 (en) * | 2001-02-26 | 2002-08-28 | Samsung Electronics Co., Ltd. | Combline filter |
| CN101719579A (en) * | 2009-12-30 | 2010-06-02 | 西安空间无线电技术研究所 | Multi-band bandstop filter and multi-band bandpass filter |
| CN102447150A (en) * | 2010-10-12 | 2012-05-09 | 环旭电子股份有限公司 | Multi-frequency band-pass filter |
| CN102723542A (en) * | 2012-06-14 | 2012-10-10 | 重庆大学 | Ultra-broad stopband microstrip low-pass filter |
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2013
- 2013-09-29 CN CN2013104569303A patent/CN103474729A/en active Pending
Patent Citations (5)
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| JP2002135004A (en) * | 2000-10-27 | 2002-05-10 | Shimada Phys & Chem Ind Co Ltd | High-frequency filter |
| EP1235297A2 (en) * | 2001-02-26 | 2002-08-28 | Samsung Electronics Co., Ltd. | Combline filter |
| CN101719579A (en) * | 2009-12-30 | 2010-06-02 | 西安空间无线电技术研究所 | Multi-band bandstop filter and multi-band bandpass filter |
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| HAN S. H.等: "ANALYSIS AND DESIGN OF MULTIPLE-BAND BANDSTOP FILTERS", 《PROGRESS IN ELECTROMAGNETICS RESEARCH》, vol. 70, 31 December 2007 (2007-12-31), XP006024066, DOI: doi:10.1049/ip-map:20045094 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078726A (en) * | 2014-06-04 | 2014-10-01 | 中国电子科技集团公司第十研究所 | Parallel connection type unilateral elliptic function transmission line filter |
| CN104078726B (en) * | 2014-06-04 | 2016-07-06 | 中国电子科技集团公司第十研究所 | Parallel connection type one side elliptic function line filter |
| CN106816675A (en) * | 2017-03-10 | 2017-06-09 | 京信通信系统（中国）有限公司 | Cavity type bandstop filter and radio-frequency devices |
| CN106816675B (en) * | 2017-03-10 | 2019-12-17 | 京信通信系统（中国）有限公司 | Cavity type band-stop filter and radio frequency device |
| WO2021077379A1 (en) * | 2019-10-24 | 2021-04-29 | 华为技术有限公司 | Band-stop filter and electronic device |
| CN114556693A (en) * | 2019-10-24 | 2022-05-27 | 华为技术有限公司 | Band elimination filter and electronic equipment |
| US12034195B2 (en) | 2019-10-24 | 2024-07-09 | Huawei Technologies Co., Ltd. | Band-stop filter and electronic device |
| CN111970727A (en) * | 2020-07-15 | 2020-11-20 | 国家无线电监测中心检测中心 | NB-IoT base station blocking test system |
| CN114914646A (en) * | 2022-05-12 | 2022-08-16 | 安徽阖煦微波技术有限公司 | Band elimination filter of standard waveguide port |
| CN114914646B (en) * | 2022-05-12 | 2023-11-03 | 安徽阖煦微波技术有限公司 | Band-stop filter of standard waveguide port |
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Application publication date: 20131225 |