CN102522616A - 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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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 the wireless communication system radio-frequency front-end.
Background technology
The microwave wireless power technology has produced tremendous influence to development of modern society, increasing along with the microwave and millimeter wave communication service especially, 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 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 such as Bart irrigate to have only through increasing filter order with Chebyshev filter now and could satisfy the high selectivity requirement, and the filter volume and weight that processes is relatively large, no longer is fit to the demand of Modern Communication System design.Though elliptic function or cross-couplings filter have good selectivity, design relative complex, variable is wayward.
Dual-mode resonator is because 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.The bimodulus technology is emerging technology in the microwave filter industry; Its advantage is: each bimodulus resonant cavity can make two modes of resonance be operated in a frequency simultaneously; Played the effect of two-chamber cascade; Filter required resonator number under same index is reduced by half, thereby realized the filter miniaturization, the characteristics of compact conformation.And two kinds of patterns in the resonant cavity have self coupling closes, can instinct produce transmission zero at stopband, the therefore outer superiority of band with high selectivity.Dual mode filter comprehensive theory and designing technique based on above characteristic 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 also all is to carry out on this basis; Cause way of realization single, bandwidth is difficult to the defective of broadening, can not satisfy the Modern Communication System requirement changeable to the filter bandwidht flexible design.
Summary of the invention
The objective of the invention is to deficiency to the prior art existence; A kind of bimodule band-pass filter based on both-end short circuit resonator is proposed; Distortion with the multiple version of flexible realization; Make more than the broadened bandwidth to 30%, satisfy the Modern Communication System demand changeable the 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 the both-end short circuit micro-strip resonantor, reaches the required bandwidth of Design of Filter through the length of regulating the 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 a pair of input and output " T " shape feeder line, little band dielectric-slab, metal ground plate and micro-strip resonantor; A pair of input and output " T " shape feeder line and micro-strip resonantor are arranged on little band dielectric-slab of metal ground plate top, it is characterized in that:
Resonator adopts linear both-end short-circuit structure, and the center is loaded with the little band minor matters of short circuit, to realize the coupling of two kinds of modes of resonance in the both-end short circuit resonator;
A pair of input and output " T " shape feeder line lies in a horizontal plane in a side of micro-strip resonantor, and forms the slit of the satisfied 0＜g of size＜10mm between the two, and to produce the coupling between the feeder line, the increase band is outer to be transmitted zero point, realizes being with the highly inhibited of outer performance.
Described microstrip bimodule band-pass filter is characterized in that, the length of linear pattern micro-strip resonantor satisfies:
Wherein, λ
gBe the dielectric waveguide wavelength, c is the light velocity in the vacuum, ε
eBe the effective dielectric constant of this linear pattern micro-strip resonantor, f
0Resonance frequency for the 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
2The short circuit microstrip line, L
2Satisfy: 0＜L
2＜λ
g/ 4; w
1Satisfy: w
1=L
1/ 2-L
3
Described microstrip bimodule band-pass filter is characterized in that, the slit results from the end of a pair of T-shape feeder line, and gap size satisfies: 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; Little band split ring resonator is characterized in that, little band split ring resonator adopts the both-end short-circuit structure of folded form; And the center is loaded with the short circuit minor matters, to realize the coupling of two kinds of modes of resonance in the little band split ring resonator of folded form; The defeated feeder line of a pair of input vertically is placed on a side of the little band split ring resonator of folded form; And a pair of input and output feeder terminal position forms the slit that size satisfies 0＜g＜10mm; Transmit zero point to produce the coupling between the feeder line, to increase outside the band, realize the highly inhibited of the outer performance of band.
Described microstrip bimodule band-pass filter is characterized in that, the total length of the little band split ring resonator of folded form is 2 * (L
1+ L
2+ L
3+ L
4), and satisfy:
Wherein, λ
gBe the dielectric waveguide wavelength, c is the light velocity in the vacuum, ε
eBe the effective dielectric constant of this resonant ring 21, L
1Be the length of microstrip line 211, L
2Be the length of microstrip line 212, L
3Be the length of microstrip line 213, L
4Be the length of microstrip line 214, f
0Resonance frequency for 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; " L " the type feeder line and the little band minor matters of " L " type that comprise a pair of input and output, enclosed type side's ring micro-strip resonantor; It is characterized in that; Enclosed type side encircles any position, angle short circuit of micro-strip resonantor, and loads the 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; The little band minor matters of " L " type are placed on the end of " L " type feeder line of a pair of input and output, transmit zero point to produce the coupling between the feeder line, to increase outside the band, realize 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 satisfy:
λ wherein
gBe the dielectric waveguide wavelength, c is the light velocity in the vacuum, ε
eBe the effective dielectric constant of this enclosed type side's ring micro-strip resonantor, L
1Be the length of side of side's ring micro-strip resonantor, f
0Resonance frequency for enclosed type side's ring micro-strip resonantor.
Described microstrip bimodule band-pass filter is characterized in that, the length L of the little band minor matters of " L " type (34)
3Satisfy: 0＜L
3＜λ
g/ 2, λ wherein
gBe the 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 owing to respectively add a short dot at the two ends of micro-strip resonantor; And in these resonator center loaded microstrip short circuit minor matters; Owing to the equivalence of location of short circuit, realized the flexible and changeable property of design form, for example linear pattern, folded form and enclosed type; Brought 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 can respectively realize a transmission zero in the right ends of passband owing to produced coupling between the feeder line, has realized outer highly inhibited of passband.
Description of drawings
Fig. 1 is the three-dimensional structure sketch map of first embodiment of the invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the planar structure sketch map of second embodiment of the invention;
Fig. 4 is the planar structure sketch map of third embodiment of the invention;
Fig. 5 is the frequency response curve of the embodiment of the invention 1;
Fig. 6 is the frequency response curve of the embodiment of the invention 2;
Fig. 7 is the frequency response curve of the embodiment of the invention 3.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated:
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 a pair of symmetrical input and output " T " shape feeder line 13, little band dielectric-slab 14, metal ground plate 15 is formed.Wherein:
Little band medium substrate 14, adopting dielectric constant is 2.65, thickness of slab is that the single face of 1mm covers the copper medium substrate;
Linear pattern both-end short circuit micro-strip resonantor 11 is realized by copper sheet, is processed in the upper surface of little band medium substrate 14, makes 11 two ends of resonator be connected on the metal floor 15 length L of micro-strip resonantor 11 through via hole
1=48mm equals a guide wavelength, corresponding resonance frequency
ε
eEffective dielectric constant for this little band 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;
A pair of input and output " T " shape feeder line 13; Be positioned at the upper surface of little band medium substrate 14; Connect feeder line 131 by orthogonal port and form with coupling feed 132 cascades, this port connects feeder line 131 and is used 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, its apart from micro-strip resonantor apart from d=0.1mm, and a pair of input and output feeder line 13 terminal positions form size and are: the slit 14 of g=1mm; To produce the coupling between the feeder line; End respectively produces a transmission zero about passband, realizes the highly inhibited of the outer performance of band, and its frequency response curve is as shown in Figure 5.
Among Fig. 5, | S
21| be the transfer curve of filter, | S
11| be the coverage diagram of filter 1 port.Can be known that by Fig. 5 the passband central frequency of this band pass filter is 3.84GHz, relative bandwidth is 32.4%, and a transmission zero appears in passband left side 0.95GHz, and a transmission zero appears in 5.09GHz on the passband right side, has realized the highly inhibited of the outer performance of band.
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, and a pair of input and output feeder line 23 is formed, little band medium substrate the same with among the embodiment 1.Wherein:
Folded form both-end short circuit micro-band resonance ring 21 is realized by copper sheet, is processed in the upper surface of little band medium substrate, realizes the short circuit at resonant ring 21 two ends through 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
eBe the effective dielectric constant of this little band 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 little band medium substrate upper surface, connects feeder line 231 by port and forms with coupling feed 232 cascades, and port connects feeder line 231 and is used for port match and welding, its width w=2.7mm; Coupling feed 232, its length L
6=19.9mm, the side that is placed on micro-strip resonantor 21 that this coupling feed is vertical is carried out feed, and apart from micro-strip resonantor 21 apart from d=0.2mm; These a pair of input and output feeder line 23 terminal positions form the slit 24 of big or small g=1mm, and to produce the coupling between the feeder line, end respectively produces a transmission zero about passband, realize the highly inhibited of the outer performance of band, and its frequency response curve is as shown in Figure 6.
Among Fig. 6, | S
21| be the transfer curve of filter, | S
11| be the coverage diagram of filter 1 port; Can know by Fig. 6; The passband central frequency of this band pass filter is 1.7GHz, and relative bandwidth is 7.3%, and a transmission zero appears in passband left side 1.35GHz; And a transmission zero appears in 2.07GHz place, passband right side, has realized the outer high suppression characteristic of filter band.
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, and a pair of input and output " L " type feeder line 33 and " L " type microstrip line 34 are formed, little band medium substrate the same with among the embodiment 1.Wherein:
Enclosed type both-end short circuit side ring micro-strip resonantor 31 is realized by copper sheet, is processed in the upper surface of little band medium substrate, and through 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
eBe the effective dielectric constant of this little band medium substrate, wherein, L
1=19.35mm.
The little band minor matters 32 of short circuit are carried in the diagonal position that enclosed type side encircles 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 little band medium substrate upper surface, connects feeder line 331 by orthogonal port and forms with coupling feed 332 cascades.Port connects feeder line 331 and is used 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, feed is carried out in the both sides that are placed on micro-band resonance ring 31, apart from enclosed type side's ring micro-strip resonantor 31 apart from d=0.1mm.
This instance is owing to the end that " L " type microstrip line is placed on input and output feeder line 33, length L
3=7mm makes a pair of input and output feeder line 31 produce coupling, thereby can about passband, hold and respectively produce a transmission zero, realizes being with the highly inhibited of outer performance, and its frequency response curve is as shown in Figure 7.
Among Fig. 7, | S
21| be the transfer curve of filter, | S
11| be the coverage diagram of filter 1 port; Can know by Fig. 7; The passband central frequency of this band pass filter is 2.43GHz, and relative bandwidth is 27.1%, and a transmission zero appears in passband left side 1.1GHz; And a transmission zero appears in 2.98GHz place, passband right side, has realized the outer high suppression characteristic of filter band.
The foregoing description is merely preferred implementation of the present invention; But execution mode of the present invention is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit 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. microstrip bimodule band-pass filter based on both-end short circuit resonator; Comprise a pair of input and output " T " shape feeder lines (13), little band dielectric-slab (14), metal ground plate (15) and micro-strip resonantor (11); A pair of input and output " T " shape feeder lines (13) and micro-strip resonantor (11) are arranged on little band dielectric-slab (14) of metal ground plate (15) top, it is characterized in that:
Resonator (11) adopts linear both-end short-circuit structure, and the center is loaded with the little band minor matters of short circuit (12), to realize the coupling of two kinds of modes of resonance in the both-end short circuit resonator;
A pair of input and output " T " shape feeder lines (13) lie in a horizontal plane in a side of micro-strip resonantor (11); And form the slit (16) that size satisfies 0＜g＜10mm between the two; Transmit zero point to produce the coupling between the feeder line, to increase outside the 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 length of linear pattern micro-strip resonantor (11) satisfies:
Wherein, λ
gBe the dielectric waveguide wavelength, c is the light velocity in the vacuum, ε
eBe the effective dielectric constant of this linear pattern micro-strip resonantor (11), f
0Resonance frequency for the linear pattern micro-strip resonantor.
3. microstrip bimodule band-pass filter according to claim 1 is characterized in that, center loaded short circuit minor matters (12) are that width is w
1, length is L
2The short circuit microstrip line, L
2Satisfy: 0＜L
2＜λ
g/ 4; w
1Satisfy: w
1=L
1/ 2-L
3
4. microstrip bimodule band-pass filter according to claim 1 is characterized in that, slit (16) result from the end of a pair of T-shape feeder line (13), and slit (16) size satisfies: 0＜g＜10mm.
5. microstrip bimodule band-pass filter based on both-end short circuit resonator; Comprise a pair of input and output feeder line (23); Little band split ring resonator (21) is characterized in that, little band split ring resonator (21) adopts the both-end short-circuit structure of folded form; And the center is loaded with short circuit minor matters (22), to realize the coupling of two kinds of modes of resonance in the little band split ring resonator of folded form; The side that feeder line (23) vertically is placed on the little band split ring resonator of folded form (21) is failed in a pair of input; And form the slit (24) that size satisfies 0＜g＜10mm between a pair of input and output feeder line (23); To produce the coupling between the feeder line; Increase outside the band and transmit zero point, realize the highly inhibited of the outer performance of band.
6. microstrip bimodule band-pass filter according to claim 5 is characterized in that, the total length of the little band split ring resonator of folded form (21) is 2 * (L
1+ L
2+ L
3+ L
4), and satisfy:
Wherein, λ
gBe the dielectric waveguide wavelength, c is the light velocity in the vacuum, ε
eBe the effective dielectric constant of this resonant ring (21), L
1Be the length of microstrip line (211), L
2Be the length of microstrip line (212), L
3Be the length of microstrip line (213), L
4Be the length of microstrip line (214), f
0Resonance frequency for folded form micro-band resonance ring (21).
7. microstrip bimodule band-pass filter according to claim 5 is characterized in that, slit (24) result from the end of a pair of input and output feeder line (23), and length g satisfies: 0＜g＜10mm.
8. microstrip bimodule band-pass filter based on both-end short circuit resonator; " L " type feeder line (33) and the little band minor matters of " L " type (34) that comprise a pair of input and output, enclosed type side's ring micro-strip resonantor (31); It is characterized in that; Enclosed type side encircles any position, angle short circuit of micro-strip resonantor (31), and loads the little 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 resonator (31); " L " type feeder line (33) of a pair of input and output is placed on the both sides of enclosed type side's ring resonator (31); The little 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, transmit zero point to produce the coupling between the feeder line, to increase outside the band, realize the highly inhibited of the outer performance of band.
9. microstrip bimodule band-pass filter according to claim 8 is characterized in that, the total length of enclosed type side's ring micro-strip resonantor (31) is 4L
1, and satisfy:
λ wherein
gBe the dielectric waveguide wavelength, c is the light velocity in the vacuum, ε
eBe the effective dielectric constant of this enclosed type side's ring micro-strip resonantor (31), L
1Be the length of side of side's ring micro-strip resonantor (31), f
0Resonance frequency for enclosed type side's ring micro-strip resonantor (31).
10. microstrip bimodule band-pass filter according to claim 8 is characterized in that, the length L of the little band minor matters of " L " type (34)
3Satisfy: 0＜L
3＜λ
g/ 2, λ wherein
gBe the dielectric waveguide wavelength, be placed on the end of a pair of input and output " L " type feeder lines (33).
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| CN103985927A (en) * | 2014-05-09 | 2014-08-13 | 南京航空航天大学 | High common-mode rejection dual-mode broad band balance microstrip filter |
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| CN107666034A (en) * | 2016-07-28 | 2018-02-06 | 大唐终端技术有限公司 | A kind of antenna assembly and mobile terminal |
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| CN115189108A (en) * | 2022-08-08 | 2022-10-14 | 河南科技大学 | Double-passband filter based on multimode resonator |
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| CN103187600A (en) * | 2013-03-11 | 2013-07-03 | 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 |
| CN104577279A (en) * | 2013-10-15 | 2015-04-29 | 国基电子（上海）有限公司 | Band-pass filter capable of inhibiting frequency-doubling harmonic waves |
| CN104659447A (en) * | 2013-11-22 | 2015-05-27 | 南京理工大学 | Narrow-band difference band-pass filter based on terminal short circuit self-coupling annular resonator |
| 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 |
| CN103985927A (en) * | 2014-05-09 | 2014-08-13 | 南京航空航天大学 | High common-mode rejection dual-mode broad band balance microstrip filter |
| CN107666034A (en) * | 2016-07-28 | 2018-02-06 | 大唐终端技术有限公司 | A kind of antenna assembly and mobile terminal |
| 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 |
| CN114649656A (en) * | 2022-04-28 | 2022-06-21 | 电子科技大学 | Dual-passband filtering phase shifter |
| CN115189108A (en) * | 2022-08-08 | 2022-10-14 | 河南科技大学 | Double-passband filter based on multimode resonator |
| 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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