CN103035985A - Toroidal cavity resonator based ultra wide band (UWB) notch filter - Google Patents
Toroidal cavity resonator based ultra wide band (UWB) notch filter Download PDFInfo
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- CN103035985A CN103035985A CN2012105447347A CN201210544734A CN103035985A CN 103035985 A CN103035985 A CN 103035985A CN 2012105447347 A CN2012105447347 A CN 2012105447347A CN 201210544734 A CN201210544734 A CN 201210544734A CN 103035985 A CN103035985 A CN 103035985A
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Abstract
The invention discloses a toroidal cavity resonator based ultra wide band (UWB) notch filter which comprises a micro-strip substrate, a front face part, a reverse face part, and input\output terminals. The toroidal cavity resonator based UWB notch filter is characterized in that the front face part and the reverse face part are respectively located on the two faces of the micro-strip substrate, the reverse face part is used as a metal grounding plate of the filter, the number of the input\output terminals is two, and the input\output terminals are respectively a first input\output terminal and a second input\output terminal. The toroidal cavity resonator based UWB notch filter has the advantages of being small in size, wide in band, good in out-of-band rejection, controllable in model, good in notch properties, and the like.
Description
Technical field
The present invention relates to the technical field of filter, particularly a kind of band trap ultra-wide band filter based on toroidal cavity resonator.
Background technology
Super-broadband tech just occurred as far back as 1940, was derived from the time-domain electromagnetics the intrinsic impulse response of microwave network and described its temporal properties; Nineteen sixty, super-broadband tech was for the Radar Technology field; Ultra-wideband pulse detector in 1972 application United States Patent (USP); Initial ultra-wideband communication system appearred in 1978; Ultra-wideband communication system in 1984 successfully stitches and has carried out 10 kilometers test; Nineteen ninety, US Department of Defense's high-level plan office began super-broadband tech is verified.In February, 2002 FCC (Federal Communication Commission-FCC) has issued " the First Report and Order " about super-broadband tech, allows that super-broadband tech is commercial to use.This is an important milestone of super-broadband tech development.Therefore, super-broadband tech, particularly super broad band radio communication begin to be subject to paying close attention to more widely.Ultra broadband (UWB) system adopts narrow pulse signal to realize communication, is a kind of brand-new transmission and processing mode for traditional continuous carrier modulation transmission such as spread spectrum communication.It has following uniqueness and novel characteristics: UWB signal occupied frequency band is wide, and transmission rate is high: the open frequency range of FCC is 3.1-10.6GHz at present, and is comparatively smooth therefore the power spectral density of UWB system emission can be very low, has very strong anti-arrowband interference performance; Extremely wide frequency band adds the elimination of indoor multi-path influence, can realize higher data transmission rate, and largest data transfer speed can reach several gigabits of per second.In addition, super-broadband tech also have that indoor multi-path resolved ability is strong, hardware is easily realized, the characteristics such as low in energy consumption, good concealment.
In a communication system, filter ubiquity between the input/output terminal of active circuit is at different levels, each filter has different separately functions.Filter is indispensable device of wireless communication system, the communication quality of its performance quality direct relation whole system.The function of receiving end filter comprises to be avoided owing to the leakage of transmitting terminal output signal makes receiver front end saturated; Remove the interference signal such as image frequency one class; Reduce the Power leakage from the local oscillator of antenna end.The basic function of band pass filter is that channel is selected, so it must have precipitously along decay, good characteristics such as group delay, and as narrow band filter, excellent temperature stability is arranged.Filtering is carried out after first the signal that gathers being processed in the position of UWB filter between chip, amplifier and antenna, could amplify and launch, and as seen its effect and status all are very important [2].Along with the development of wireless communication technology, people have higher requirement to communication speed and capacity.Communicate by letter with jumbo in order to satisfy two-forty, 3G and 4G wireless communication technology must address these problems.Because the superior characteristics of UWB technology self so that it becomes short haul connection and one of wireless LAN communication is well selected, also are the trend of future wireless development.
Along with the development take cellular mobile communication, WLAN (wireless local area network) as the wireless communication technology of representative, filter research constantly makes further progress.In the radio-frequency front-end of all Modern wireless communication equipment, the band pass filter that microencapsulated, performance be good, low-cost, be easy to install and use is related device miniaturization, microminiaturized emphasis always.Yet, along with the arrival of 3G and 4G wireless communication technology, communicate by letter with jumbo in order to satisfy two-forty, the design of telecommunication circuit has been proposed higher harsher specification requirement.The quality of performance of filter, the quality of direct relation communication quality, and the process of wireless communication technology development.Therefore, how the superior UWB filter of design performance just seems very necessary.Filter becomes the key of whole UWB system noise performance quality to the inhibition of out-of-band noise.Microstrip line has periodically frequency response, therefore, how to control the interior attenuation pole position of stopband and comes the response of rejects trap stopband higher modes to become another emphasis that we design the UWB filter.
In addition, the standard of wireless lan (wlan) with IEEE802.11a with 5.15-5.35GHz and these two frequency ranges of 5.725-5.825GHz all as one of its working frequency range, in the situation that two kinds of systems all exist, may form radio ultra wide band system and disturb, therefore be necessary to design a kind of ultra-wide band filter that can suppress the interference of WLAN signal.Realize that at present the common method with the trap ultra-wide band filter is exactly to add band resistance unit in original filter basis.Interior band resistance element method comprises following several aspect: one, increase the fluting transmission unit; Two, embedded open circuit minor matters; Three, the coupling of introducing between band resistance unit and the filter realizes the band resistance.Above-mentioned the whole bag of tricks major defect comprises that bandwidth of rejection is narrower and uncontrollable, and processing is comparatively complicated, is not easy to expansion to realize two trap characteristics, therefore needs a kind of novel trap structure to realize the trap implementation method of wider and easy control.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art with not enough, a kind of small-sized band trap ultra-wide band filter based on microstrip circuit is provided, can satisfy small-sized, broadband, Out-of-band rejection is good, have the characteristics such as the controlled and trap characteristic of pattern is good.
In order to achieve the above object, the present invention is by the following technical solutions:
A kind of band trap ultra-wide band filter based on toroidal cavity resonator of the present invention, comprise microstrip substrate, front portion, reverse side part and input output port; Described front portion and reverse side partly lay respectively on two faces of described microstrip substrate, and the reverse side part is as the metal ground plate of described filter; The input output port have two, be respectively first the input output port and second the input output port.
Preferably, described front portion comprises toroidal cavity resonator, the first stopband unit and the second stopband unit that the first uniform transmission line unit, the second uniform transmission line unit, the first parallel coupling feeder line, the second parallel coupling feeder line, minor matters load; Described the first uniform transmission line unit, the second uniform transmission line unit lay respectively at positive two ends, the left and right sides, described the first input output port link to each other with the first uniform transmission line, second input output port be connected with the second uniform transmission line; The first parallel coupling feeder line is connected by the toroidal cavity resonator that minor matters load with the second parallel coupling feeder line; The non-openend of the first parallel coupling feeder line is connected with the first uniform transmission line unit, and the non-openend of the second parallel coupling feeder line is connected with the second uniform transmission line unit.
Preferably, the toroidal cavity resonator that described minor matters load loads two groups of minor matters by length by the long toroidal cavity resonator of all-wave and is formed, and the centre frequency that all-wave is long is 6.85GHz,
Preferably, the first stopband unit is connected with the toroidal cavity resonator that minor matters load with the mode of the second stopband unit with slot-coupled, the first stopband unit via hole all is connected with metal ground connection floor by metal with the second stopband unit via hole, and they lay respectively at the inner bilateral symmetry distribution of toroidal cavity resonator that minor matters load.
Preferably, the first stopband unit is identical with the second stopband cell size, the formed stopband range of the first stopband unit and the second stopband unit can cover 5.15-5.35GHz and two frequency ranges of 5.725-5.825GHz of WLAN, hinder the some length of unit and the position of via hole by changing band, can change the position of trap, by the coupling slit between the toroidal cavity resonator that changes band resistance unit and minor matters loading, can change the bandwidth of trap stopband.
Preferably, described microstrip substrate dielectric constant is 2.55, and thickness is 0.8mm.
Preferably, the first parallel coupling feeder line and the second parallel coupling feeder line are respectively " [" shape and "] " shape, and arrange in opposite directions with openend.
Preferably, described aft section comprises unit, the first defective ground, the second defective unit, ground and grounded metal floor; Unit, the first defective ground is positioned at the first parallel coupling feeder line below, and unit, the second defective ground is positioned at the second parallel coupling feeder line below; First the input output port, second the input output port also be connected with the grounded metal floor.
Preferably, unit, the first defective ground, unit, the second defective ground all are that etching is removed corresponding planform on metal floor.
Preferably, described the first uniform transmission line unit, the second uniform transmission line unit are on the same level line.
The present invention has following advantage and effect with respect to prior art:
1, the present invention utilizes four broadbands that pattern formation is unified of annular multimode resonator, can covering ultra wideband communications band 3.1-10.6GHz.And four patterns can independently be controlled, so the passband width of patent can independently be controlled.
2, the present invention adds two groups of minor matters on the basis of toroidal cavity resonator, lays respectively at center and the position, both sides of toroidal cavity resonator, can produce respectively one group of transmission zero at upper stopband, effectively improves Out-of-band rejection.
3, the present invention introduces band resistance unit, and the structural design of band resistance unit is versatile and flexible, can realize the trap characteristic of very wide stopband, can change the position of trap and the bandwidth of trap stopband.
4, the present invention is with the further miniaturization of UWB filter, and size is little, and cost is low, easily processing, and more compact structure is easier to other circuit integrated.
Description of drawings
Fig. 1 is the overall structural representation of ultra-wide band filter of the present invention.
Fig. 2 is the Facad structure schematic diagram of ultra-wide band filter of the present invention.
Fig. 3 is the reverse side structural representation of ultra-wide band filter of the present invention.
Fig. 4 is Electromagnetic Simulation and the test curve (1-15GHz) with the frequency response of trap characteristic ultra-wide band filter.
Fig. 5 is the thin section curve of trap place frequency response.
Fig. 6 is Electromagnetic Simulation and the test curve (0-30GHz) with the frequency response of trap characteristic ultra-wide band filter.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, its by microstrip substrate 10, front portion, reverse side part and input output port form; Described front portion and reverse side partly lay respectively on two faces of described microstrip substrate, and the reverse side part is as the grounded metal floor 15 of described filter; The input output port have two, be respectively first the input output port 1 and second the input output port 6.
As shown in Figure 2, described front portion comprises: toroidal cavity resonator 7, the first stopband unit 8, the second stopband unit 9 that the first uniform transmission line unit 2, the second uniform transmission line unit 5, the first parallel coupling feeder line 3, the second parallel coupling feeder line 4, minor matters load; Described the first uniform transmission line unit 2, the second uniform transmission line unit 5 lay respectively at positive two ends, the left and right sides and are on the same level line, described the first input output port 1 link to each other with the first uniform transmission line 2, second input output port 6 be connected with the second uniform transmission line 5; Described the first parallel coupling feeder line 3 and the second parallel coupling feeder line 4 are respectively " [" shape and "] " shape and arrange in opposite directions with openend; The first parallel coupling feeder line 3 is connected by the toroidal cavity resonator 7 that minor matters load with the second parallel coupling feeder line 4; The first parallel coupling feeder line 3 non-openends are connected with the first uniform transmission line unit 2, and the second parallel coupling feeder line 5 non-openends are connected with the second uniform transmission line unit 4; The toroidal cavity resonator 7 that minor matters load is that the toroidal cavity resonator of all-wave long (centre frequency is 6.85GHz) loads two groups of minor matters and formed by length; The first stopband unit 8 is connected with the toroidal cavity resonator 7 that minor matters load with the mode of the second stopband unit 9 with slot-coupled, the via hole 13 of the first stopband unit is connected with grounded metal floor 15 respectively with the via hole 14 of the second stopband unit, and the via hole 13 of described the first stopband unit and the via hole 14 of the second stopband unit lay respectively at the toroidal cavity resonator 7 inner bilateral symmetry distributions that minor matters load; The first stopband unit 8 and the second stopband unit 9 are measure-alike, formed stopband can cover two frequency ranges (5.15-5.35GHz and 5.725-5.825GHz) of WLAN, hinder the some length of unit and the position of via hole by changing band, can change the position of trap, by the coupling slit between the toroidal cavity resonator 7 that changes band resistance unit and minor matters loading, can change the bandwidth of trap stopband.The microstrip substrate dielectric constant is 2.55, and thickness is 0.8mm.
As shown in Figure 3, described reverse side partly comprises: unit 11, the first defective ground, the second defective unit 12, ground and grounded metal floor 15; Unit 11, the first defective ground, unit 12, the second defective ground all are that etching is removed corresponding planform on the grounded metal floor, thus the air element that forms; Unit 11, the first defective ground is positioned at the first parallel coupling feeder line 3 belows, and unit 12, the second defective ground is positioned at the second parallel coupling feeder line 4 belows; First the input output port 1, second the input output port 6 also be connected with grounded metal floor 15.
As shown in Figure 4, the frequency characteristic of the present embodiment (1-15GH exists) comprising: the S21(insertion loss) parameter and S11(return loss) parameter, group delay.Abscissa represents frequency variable, and unit is GHz, and left side ordinate represents the amplitude variable, and unit is dB.Right side ordinate is group delay, and unit is ns.As can be seen from Figure 4, the three dB bandwidth of ultra-wide band filter of the present invention is 2.9-10.7GHz, is stopband at the 5.1-5.9GHz place wherein.Except stopband, the group delay of other frequency is all less than 0.5ns.
Figure 5 shows that the corresponding thin section of filter stop bend, can find out by introducing the first stopband unit 8 and the second stopband unit 9, in the 5.1-5.9GHz scope, obtain a trap characteristic with two reflection poleses, the trap amplitude can cover two frequency ranges of WLAN and WiMax (5.15-5.35GHz and 5.725-5.825GHz) all greater than 12dB.
As shown in Figure 6, the frequency characteristic of embodiment (0-30GH exists) comprising: the S21(insertion loss) parameter and S11(return loss) parameter, abscissa represents frequency variable, and unit is GHz, and ordinate represents the amplitude variable, and unit is dB.The Out-of-band rejection characteristic of this ultra-wide band filter is fine as can be seen from Figure 6, and the inhibition of-18dB can reach 28GHz.
Above-described embodiment is the better execution mode of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1. the band trap ultra-wide band filter based on toroidal cavity resonator comprises microstrip substrate (10), front portion, reverse side part and input output port; It is characterized in that, described front portion and reverse side partly lay respectively on two faces of described microstrip substrate, and the reverse side part is as the metal ground plate of filter; Input output port have two, be respectively the first input output port (1) and second input output port (6).
2. the band trap ultra-wide band filter based on toroidal cavity resonator according to claim 1, it is characterized in that, described front portion comprises toroidal cavity resonator (7), the first stopband unit (8) and the second stopband unit (9) that the first uniform transmission line unit (2), the second uniform transmission line unit (5), the first parallel coupling feeder line (3), the second parallel coupling feeder line (4), minor matters load; Described the first uniform transmission line unit (2), the second uniform transmission line unit (5) lay respectively at positive two ends, the left and right sides, described the first input output port (1) link to each other with the first uniform transmission line (2), second input output port (6) be connected with the second uniform transmission line (5); The first parallel coupling feeder line (3) is connected by the toroidal cavity resonator (7) that minor matters load with the second parallel coupling feeder line (4); The non-openend of the first parallel coupling feeder line (3) is connected with the first uniform transmission line unit (2), and the non-openend of the second parallel coupling feeder line (5) is connected with the second uniform transmission line unit (4).
3. the band trap ultra-wide band filter based on toroidal cavity resonator according to claim 2 is characterized in that, the toroidal cavity resonator (7) that described minor matters load loads two groups of minor matters by length by the long toroidal cavity resonator of all-wave and formed.
4. the band trap ultra-wide band filter based on toroidal cavity resonator according to claim 2, it is characterized in that, the first stopband unit (8) is connected with the toroidal cavity resonator (7) that minor matters load with the mode of the second stopband unit (9) with slot-coupled, the via hole of the first stopband unit (13) is connected with grounded metal floor (15) respectively with the via hole (14) of the second stopband unit, and the via hole of the first stopband unit (13) lays respectively at the inner bilateral symmetry distribution of toroidal cavity resonator (7) that minor matters load with the via hole (14) of the second stopband unit.
5. the band trap ultra-wide band filter based on toroidal cavity resonator according to claim 2, it is characterized in that, the first stopband unit (8) and the second stopband unit (9) are measure-alike, and the formed stopband range of the first stopband unit and the second stopband unit can cover 5.15-5.35GHz and two frequency ranges of 5.725-5.825GHz of WLAN.
6. the band trap ultra-wide band filter based on toroidal cavity resonator according to claim 2 is characterized in that, described microstrip substrate dielectric constant is 2.55, and thickness is 0.8mm.
7. the band trap ultra-wide band filter based on toroidal cavity resonator according to claim 2 is characterized in that, the first parallel coupling feeder line (3) and the second parallel coupling feeder line (4) are respectively " [" shape and "] " shape, and arranges in opposite directions with openend.
8. the band trap ultra-wide band filter based on toroidal cavity resonator according to claim 1 and 2 is characterized in that, described aft section comprises unit (11), the first defective ground, the second defective unit (12), ground and grounded metal floor (15); The first defective unit, ground (11) is positioned at the first parallel coupling feeder line (3) below, and the second defective unit, ground (12) is positioned at the second parallel coupling feeder line (4) below; First the input output port (1), second the input output port (6) also be connected with grounded metal floor (15).
9. the band trap ultra-wide band filter based on toroidal cavity resonator according to claim 8 is characterized in that, unit (11), the first defective ground, the second defective unit, ground (12) all are to remove corresponding planform in grounded metal floor (15) upper etching.
10. the band trap ultra-wide band filter based on toroidal cavity resonator according to claim 1 is characterized in that, described the first uniform transmission line unit (2), the second uniform transmission line unit (5) are on the same level line.
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| CN104103879A (en) * | 2014-05-06 | 2014-10-15 | 西安理工大学 | Ultra-wideband filter with notching function |
| CN106299555A (en) * | 2015-05-27 | 2017-01-04 | 南宁富桂精密工业有限公司 | Band filter |
| US10096878B2 (en) | 2015-05-27 | 2018-10-09 | Cloud Network Technology Singapore Pte. Ltd. | Microstrip band-pass filter having first and second trapezoidal shape coupling portions connected by a connection portion |
| CN109994808A (en) * | 2019-01-25 | 2019-07-09 | 成都顺为超导科技股份有限公司 | A kind of bicyclic ultra wide band bandpass filter of high-temperature superconductor multimode |
| CN110021803A (en) * | 2019-03-26 | 2019-07-16 | 西安理工大学 | There are three the ultra-wide band filters of trap frequency point for tool |
| CN115411475A (en) * | 2022-09-02 | 2022-11-29 | 南方海洋科学与工程广东省实验室(湛江) | Millimeter wave band elimination filter on adjustable chip |
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| CN109994808A (en) * | 2019-01-25 | 2019-07-09 | 成都顺为超导科技股份有限公司 | A kind of bicyclic ultra wide band bandpass filter of high-temperature superconductor multimode |
| CN109994808B (en) * | 2019-01-25 | 2024-08-02 | 成都顺为超导科技股份有限公司 | Double-ring ultra-wideband band-pass filter with superconductive multi-mode |
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| CN110021803B (en) * | 2019-03-26 | 2020-12-18 | 西安理工大学 | Ultra-wideband filter with three trapped wave frequency points |
| CN115411475A (en) * | 2022-09-02 | 2022-11-29 | 南方海洋科学与工程广东省实验室(湛江) | Millimeter wave band elimination filter on adjustable chip |
| CN115411475B (en) * | 2022-09-02 | 2024-02-13 | 南方海洋科学与工程广东省实验室(湛江) | Adjustable on-chip millimeter wave band-stop filter |
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Effective date of registration: 20170112 Address after: 510535 Guangzhou science and Technology Development Zone, high tech Industrial Development Zone, Guangdong, No. 182 Patentee after: Guangzhou Sunrise Communication Equipment Co., Ltd. Address before: 510640 Tianhe District, Guangdong, No. five road, No. 381, Patentee before: Huana Science and Engineering Univ. |
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