CN102522616B - Micro-band dual-mode band-pass filter based on double-end short-circuit resonator - Google Patents
Micro-band dual-mode band-pass filter based on double-end short-circuit resonator Download PDFInfo
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- CN102522616B CN102522616B CN201210009052.6A CN201210009052A CN102522616B CN 102522616 B CN102522616 B CN 102522616B CN 201210009052 A CN201210009052 A CN 201210009052A CN 102522616 B CN102522616 B CN 102522616B
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Abstract
The invention discloses a micro-band dual-mode band-pass filter based on a double-end short-circuit resonator, which mainly solves the problems of single form and quite narrow bandwidth of a traditional micro-band dual-mode filter. The filter comprises a pair of input/output T-shaped feeder lines (13), a micro-band medium plate (14), a metal grounding plate (15) and a micro-band resonator (11); the input/output T-shaped feeder lines (13) and the micro-band resonator (11) are arranged on the micro-band medium plate (14) above the metal grounding plate (15), wherein the resonator (11) is in a linear double-end short-circuit structure, and a short-circuit micro-band branch (12) is loaded in the center; the input/output T-shaped feeder lines (13) are horizontally arranged on one side of the micro-band resonator (11), and a gap (16) is formed between the input/output T-shaped feeder lines (13), so that the feeder lines are coupled, and out-of-band transmission zeros are added; and the micro-band dual-mode band-pass filter based on the double-end short-circuit resonator has the advantages that: the coupling of the feeder lines is realized, a design form is flexible and variable and the band is wide, and can be used for a wireless communication system.
Description
Technical field
The invention belongs to technical field of electronic devices, particularly microstrip bimodule band-pass filter, can be used for wireless communication system radio-frequency front-end.
Background technology
Microwave wireless power technology has produced tremendous influence to the development of modern society, especially increasing along with microwave and millimeter wave communication service, and frequency spectrum resource is day by day nervous, and it is thinner that band resource is divided, and the requirement of wireless terminal device is become to very harsh.An urgent demand microwave filter develops rapidly towards high-performance, miniaturization, low cost, high integrated direction, and the research of miniaturisation high-performance microstrip filter attracts increasing attention.Traditional filter form is as fertile in Bart hereby to be only had by increasing filter order and could meet high selectivity requirement with Chebyshev filter, and the filter volume and weight processing is relatively large, is no longer applicable to the demand of Modern Communication System design.Although elliptic function or cross-coupled filter have good selectivity, design relative complex, variable is wayward.
Dual-mode resonator is because the good characteristics such as size is little, the interior high-performance of band, the outer high inhibition of band are applied in the design of wireless communication system high performance filter more and more.Bimodulus technology is an emerging technology in microwave filter industry, its advantage is: each bimodulus resonant cavity can make two modes of resonance be operated in a frequency simultaneously, play the effect of two-chamber cascade, so just can make filter required resonator number under same index reduce by half, thereby realize filter miniaturization, the feature of compact conformation.And two kinds of patterns in resonant cavity are closed with self coupling, can instinct produce transmission zero at stopband, the therefore outer superiority with high selectivity of band.Dual mode filter comprehensive theory based on above characteristic and designing technique obtain broad research in recent years at home and abroad.But because this traditional double mode filter is a closed-loop, thereby its version is greatly limited, follow-up expansion is all also to carry out on this basis, cause way of realization single, bandwidth is difficult to the defect of broadening, can not meet the requirement that Modern Communication System is changeable to filter bandwidht flexible design.
Summary of the invention
The object of the invention is to the deficiency existing for prior art, a kind of bimodule band-pass filter based on both-end short circuit resonator is proposed, to realize flexibly the distortion of various structures form, more than making broadened bandwidth to 30%, meet the demand that Modern Communication System is changeable to filter bandwidht flexible design.
The key problem in technology of realizing the object of the invention is to load short circuit minor matters in both-end short circuit micro-strip resonantor center, to realize the coupling of two kinds of patterns in both-end short circuit micro-strip resonantor, reaches the required bandwidth of design of filter by the length that regulates short circuit minor matters.Its technical scheme has following three kinds:
Technical scheme 1:
The present invention is based on the microstrip bimodule band-pass filter of both-end short circuit resonator, comprise the "T"-shaped feeder line of a pair of input and output, micro-band dielectric-slab, metal ground plate and micro-strip resonantor, the "T"-shaped feeder line of a pair of input and output and micro-strip resonantor are arranged on micro-band dielectric-slab of metal ground plate top, it is characterized in that:
Resonator adopts linear both-end short-circuit structure, and center is loaded with the micro-band minor matters of short circuit, to realize the coupling of two kinds of modes of resonance in both-end short circuit resonator;
The "T"-shaped feeder line of a pair of input and output lies in a horizontal plane in a side of micro-strip resonantor, and form the gap of the satisfied 0 < g < 10mm of size between the two, to produce the coupling between feeder line, increase the outer transmission zero of band, realize the highly inhibited of the outer performance of band.
Described microstrip bimodule band-pass filter, is characterized in that, the length of linear pattern micro-strip resonantor meets:
wherein, λ
gfor dielectric waveguide wavelength, c is the light velocity in vacuum, ε
efor the effective dielectric constant of this linear pattern micro-strip resonantor, f
0for the resonance frequency of linear pattern micro-strip resonantor.
Described microstrip bimodule band-pass filter, is characterized in that, center loaded short circuit minor matters (12) are that width is w
1, length is L
2short circuit microstrip line, L
2meet: 0 < L
2< λ
g/ 4; w
1meet: w
1=L
1/ 2-L
3.
Described microstrip bimodule band-pass filter, is characterized in that, gap results from the end of a pair of T-shape feeder line, and gap size meets: 0 < g < 10mm.
Technical scheme 2:
The present invention is based on the microstrip bimodule band-pass filter of both-end short circuit resonator, comprise a pair of input and output feeder line, micro-band split ring resonator, it is characterized in that, micro-both-end short-circuit structure that adopts folded form with split ring resonator, and center is loaded with short circuit minor matters, to realize the micro-coupling with two kinds of modes of resonance in split ring resonator of folded form; The defeated feeder line of a pair of input is vertically placed on the micro-side with split ring resonator of folded form, and a pair of input and output feeder terminal position forms the gap of the satisfied 0 < g < 10mm of size, to produce the coupling between feeder line, increase the outer transmission zero of band, realize the highly inhibited of the outer performance of band.
Described microstrip bimodule band-pass filter, is characterized in that, the micro-total length with split ring resonator of folded form is 2 × (L
1+ L
2+ L
3+ L
4), and meet:
Wherein, λ
gfor dielectric waveguide wavelength, c is the light velocity in vacuum, ε
efor the effective dielectric constant of this resonant ring 21, L
1for the length of microstrip line 211, L
2for the length of microstrip line 212, L
3for the length of microstrip line 213, L
4for the length of microstrip line 214, f
0for the resonance frequency of folded form micro-band resonance ring 21.
Technical scheme 3:
The present invention is based on the microstrip bimodule band-pass filter of both-end short circuit resonator, comprise " L " type feeder line of a pair of input and output, the micro-band minor matters of " L " type, enclosed type side's ring micro-strip resonantor, it is characterized in that, any position, angle short circuit of enclosed type side's ring micro-strip resonantor, and load short circuit minor matters at the diagonal position at this angle, to realize the coupling of two kinds of modes of resonance in enclosed type side's ring resonator; " L " type feeder line of a pair of input and output is placed on the both sides of enclosed type side's ring resonator; A micro-end that is placed on " L " type feeder line of a pair of input and output with minor matters of " L " type, to produce the coupling between feeder line, increases the outer transmission zero of band, realizes the highly inhibited of the outer performance of band.
Described microstrip bimodule band-pass filter, is characterized in that, the total length of enclosed type side's ring micro-strip resonantor is 4L
1, and meet:
wherein λ
gfor dielectric waveguide wavelength, c is the light velocity in vacuum, ε
efor the effective dielectric constant of this enclosed type side's ring micro-strip resonantor, L
1for the length of side of side's ring micro-strip resonantor, f
0for the resonance frequency of enclosed type side's ring micro-strip resonantor.
Described microstrip bimodule band-pass filter, is characterized in that, the length L of the micro-band minor matters of " L " type (34)
3meet: 0 < L
3< λ
g/ 2, wherein λ
gfor dielectric waveguide wavelength, be placed on the end of a pair of input and output " L " type feeder lines (33).
The present invention has following technological merit:
1. the present invention is because the two ends at micro-strip resonantor respectively add a short dot, and in these resonator center loaded microstrip short circuit minor matters, due to the equivalence of location of short circuit, realize the flexible and changeable property of design form, for example linear pattern, folded form and enclosed type, bring very big facility to expansion, can select concrete implementation according to concrete occasion.
2. the present invention is because two kinds of modes of resonance are basic identical at the maximum value position of resonator internal electric field, can be synchronous apply stronger coupled outside, realize the broadband effect of resonator.
3. the present invention is owing to having produced coupling between feeder line, can respectively realize a transmission zero at the two ends, left and right of passband, realized highly inhibited outside passband.
Accompanying drawing explanation
Fig. 1 is the three-dimensional structure schematic diagram of first embodiment of the invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the planar structure schematic diagram of second embodiment of the invention;
Fig. 4 is the planar structure schematic diagram of third embodiment of the invention;
Fig. 5 is the frequency response curve of the embodiment of the present invention 1;
Fig. 6 is the frequency response curve of the embodiment of the present invention 2;
Fig. 7 is the frequency response curve of the embodiment of the present invention 3.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated:
Embodiment 1
See figures.1.and.2, the present invention is mainly by linear pattern both-end short circuit micro-strip resonantor 11, short circuit minor matters 12, and the "T"-shaped feeder line 13 of a pair of symmetrical input and output, micro-band dielectric-slab 14, metal ground plate 15 forms.Wherein:
Linear pattern both-end short circuit micro-strip resonantor 11, is realized by copper sheet, and processing, at micro-upper surface with medium substrate 14, is connected on metal floor 15 11 two ends of resonator by via hole, the length L of micro-strip resonantor 11
1=48mm, equals a guide wavelength, corresponding resonance frequency
ε
efor this micro-effective dielectric constant with medium substrate 14;
Short circuit minor matters 12, are carried in the center of both-end short circuit micro-strip resonantor 11, length L
2=1.3mm, width w
1=2mm, is used for realizing two kinds of division and couplings that annex pattern;
The "T"-shaped feeder line 13 of a pair of input and output, be positioned at micro-upper surface with medium substrate 14, formed by orthogonal port connection feeder line 131 and coupling feed 132 cascades, this port connects feeder line 131 for port match and welding, its width w=2.7mm, this coupling feed 132 is parallel with micro-strip resonantor 11, its length L
3=22mm, a side that lies in a horizontal plane in micro-strip resonantor 11 is carried out feed, it is apart from the distance d=0.1mm of micro-strip resonantor, and a pair of input and output feeder line 13 terminal positions form size and are: the gap 14 of g=1mm, to produce the coupling between feeder line, hold transmission zero of each generation in the left and right of passband, realize the highly inhibited of the outer performance of band, its frequency response curve as shown in Figure 5.
In Fig. 5, | S
21| be the transfer curve of filter, | S
11| be the coverage diagram of filter 1 port.As shown in Figure 5, the passband central frequency of this band pass filter is 3.84GHz, and relative bandwidth is 32.4%, and a transmission zero appears in passband left side 0.95GHz, occurs a transmission zero at passband right side 5.09GHz, has realized the highly inhibited of the outer performance of band.
Embodiment 2
With reference to Fig. 3, the present invention is mainly by folded form both-end short circuit micro-band resonance ring 21, short circuit minor matters 22, a pair of input and output feeder line 23 forms, micro-with medium substrate with in embodiment 1.Wherein:
Folded form both-end short circuit micro-band resonance ring 21, is realized by copper sheet, and processing, at micro-upper surface with medium substrate, realizes the short circuit at resonant ring 21 two ends by via hole, and the total length of micro-band resonance ring 21 is: 2 × (L
1+ L
2+ L
3+ L
4)=108mm, it equals a guide wavelength, corresponding resonance frequency
ε
efor this micro-effective dielectric constant with medium substrate, wherein, L
1=15.3mm, L
2=20.4mm, L
3=12mm, L
4=6.2mm.
Short circuit minor matters 22, are carried in the center of folded form both-end short circuit micro-band resonance ring 21, its length L
5=1.6mm, is used for realizing two kinds of division and couplings that annex pattern;
A pair of input and output feeder line 23, is positioned at micro-band medium substrate upper surface, is formed by port connection feeder line 231 and coupling feed 232 cascades, and port connects feeder line 231 for port match and welding, its width w=2.7mm; Coupling feed 232, its length L
6=19.9mm, a side of what this coupling feed was vertical be placed on micro-strip resonantor 21 is carried out feed, and apart from the distance d=0.2mm of micro-strip resonantor 21; These a pair of input and output feeder line 23 terminal positions form the gap 24 of big or small g=1mm, to produce the coupling between feeder line, hold transmission zero of each generation in the left and right of passband, realize the highly inhibited of the outer performance of band, and its frequency response curve as shown in Figure 6.
In Fig. 6, | S
21| be the transfer curve of filter, | S
11| be the coverage diagram of filter 1 port, as shown in Figure 6, the passband central frequency of this band pass filter is 1.7GHz, relative bandwidth is 7.3%, there is a transmission zero in passband left side 1.35GHz, and a transmission zero appears in 2.07GHz place, passband right side, realize the outer high suppression characteristic of filter band.
Embodiment 3
With reference to Fig. 4, the present invention is mainly by the square micro-band resonance ring 31 of case type both-end short circuit, center loaded short circuit minor matters 32, a pair of input and output " L " type feeder line 33, and " L " type microstrip line 34 forms, micro-with medium substrate with in embodiment 1.Wherein:
Enclosed type both-end short circuit side ring micro-strip resonantor 31, is realized by copper sheet, and processing is at micro-upper surface with medium substrate, and by arbitrary angle position short circuit of the via hole side of making ring resonator 31, the total length of enclosed type side's ring micro-strip resonantor 31 is 4L
1=77.4mm, equals a guide wavelength, corresponding resonance frequency
ε
efor this micro-effective dielectric constant with medium substrate, wherein, L
1=19.35mm.
The micro-band minor matters 32 of short circuit, are carried in the diagonal position of enclosed type side ring micro-strip resonantor 31 location of short circuit, length L
2=3mm, is used for realizing two kinds of division and couplings that annex pattern.
A pair of orthogonal input and output " L " type feeder line 33, is positioned at micro-band medium substrate upper surface, is formed by orthogonal port connection feeder line 331 and coupling feed 332 cascades.Port connects feeder line 331 for port match and welding, its width w=2.7mm; Coupling feed 332 is parallel with micro-strip resonantor 31, its length L
4=13.9mm, this coupling feed adopts vertical mode of placing, and feed is carried out in the both sides that are placed on micro-band resonance ring 31, apart from the distance d=0.1mm of enclosed type side's ring micro-strip resonantor 31.
This example is owing to " L " type microstrip line being placed on to the end of input and output feeder line 33, length L
3=7mm, makes a pair of input and output feeder line 31 produce coupling, thereby can hold in the left and right of passband transmission zero of each generation, realizes the highly inhibited of the outer performance of band, and its frequency response curve as shown in Figure 7.
In Fig. 7, | S
21| be the transfer curve of filter, | S
11| be the coverage diagram of filter 1 port, as shown in Figure 7, the passband central frequency of this band pass filter is 2.43GHz, relative bandwidth is 27.1%, there is a transmission zero in passband left side 1.1GHz, and a transmission zero appears in 2.98GHz place, passband right side, realize the outer high suppression characteristic of filter band.
Above-described embodiment is only preferably 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 principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (5)
1. the microstrip bimodule band-pass filter based on both-end short circuit resonator, comprise a pair of input and output feeder line (23), micro-band split ring resonator (21), it is characterized in that, micro-band split ring resonator (21) adopts the both-end short-circuit structure of folded form, and center is loaded with short circuit minor matters (22), to realize the micro-coupling with two kinds of modes of resonance in split ring resonator of folded form; A pair of input and output feeder line (23) is positioned at a branch of vertical curve, be placed on a side of micro-band split ring resonator (21), and the distance of the micro-band split ring resonator of distance (21) is 0.2mm, terminal position between this pair of input and output feeder line (23) forms the gap (24) of the satisfied 0 < g < 10mm of size, to produce the coupling between feeder line, increase the outer transmission zero of band, realize the highly inhibited of the outer performance of band.
2. microstrip bimodule band-pass filter according to claim 1, is characterized in that, the total length of micro-band split ring resonator (21) is 2 × (L
1+ L
2+ L
3+ L
4), and meet:
wherein, λ
gfor dielectric waveguide wavelength, c is the light velocity in vacuum, ε
efor the effective dielectric constant of this micro-band split ring resonator (21), L
1be the length of the first microstrip line (211), L
2be the length of the second microstrip line (212), L
3be the length of the 3rd microstrip line (213), L
4be the length of the 4th microstrip line (214), f
0for the resonance frequency of micro-band split ring resonator (21).
3. the microstrip bimodule band-pass filter based on both-end short circuit resonator, comprise " L " type feeder line (33) of a pair of input and output, the micro-band minor matters of " L " type (34), enclosed type side's ring micro-strip resonantor (31), it is characterized in that, any position, angle short circuit of enclosed type side's ring micro-strip resonantor (31), and load the micro-band minor matters of short circuit (32) at the diagonal position at this angle, to realize the coupling of two kinds of modes of resonance in enclosed type side's ring micro-strip resonantor (31); " L " type feeder line (33) of a pair of input and output is placed on respectively on two limits that enclosed type side's ring micro-strip resonantor (31) is adjacent, and is 0.1mm apart from the distance of enclosed type side's ring micro-strip resonantor; The micro-band minor matters of " L " type (34) are placed on the end of " L " type feeder line (33) of a pair of input and output, to produce the coupling between feeder line, increase the outer transmission zero of band, realize the highly inhibited of the outer performance of band.
4. microstrip bimodule band-pass filter according to claim 3, is characterized in that, the total length of enclosed type side's ring micro-strip resonantor (31) is 4L
1, and meet:
wherein λ
gfor dielectric waveguide wavelength, c is the light velocity in vacuum, ε
efor the effective dielectric constant of this enclosed type side's ring micro-strip resonantor (31), L
1for the length of side of enclosed type side's ring micro-strip resonantor (31), f
0for the resonance frequency of enclosed type side's ring micro-strip resonantor (31).
5. microstrip bimodule band-pass filter according to claim 3, is characterized in that, the length L of the micro-band minor matters of " L " type (34)
3meet: 0 < L
3< λ
g/ 2, wherein λ
gfor dielectric waveguide wavelength, be placed on the end of a pair of input and output " L " type feeder lines (33).
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Families Citing this family (8)
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| CN103187600B (en) * | 2013-03-11 | 2015-01-28 | 西安电子科技大学 | Dual-mode three-way wide-band filter based on multi-branch loaded square resonance ring |
| CN104577279B (en) * | 2013-10-15 | 2017-06-13 | 国基电子（上海）有限公司 | Suppress the bandpass filter of multiplied frequency harmonic |
| CN104659447B (en) * | 2013-11-22 | 2018-06-12 | 南京理工大学 | Based on terminal short circuit from the narrowband differential bandpass filter of coupling ring shape resonator |
| CN103985927B (en) * | 2014-05-09 | 2016-01-20 | 南京航空航天大学 | A kind of high common mode inhibition dual mode wideband balance microstrip filter |
| CN107666034B (en) * | 2016-07-28 | 2024-05-10 | 大唐终端技术有限公司 | Antenna device and mobile terminal |
| CN110556617A (en) * | 2019-09-05 | 2019-12-10 | 南京锐码毫米波太赫兹技术研究院有限公司 | Miniaturized high-isolation vehicle-mounted radio frequency signal separator |
| CN114649656B (en) * | 2022-04-28 | 2023-03-21 | 电子科技大学 | Dual-passband filtering phase shifter |
| CN115189108B (en) * | 2022-08-08 | 2023-10-20 | 河南科技大学 | Double-passband filter based on multimode resonator |
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