CN104409808A - Multi-bandpass filter based on multimode resonator - Google Patents
Multi-bandpass filter based on multimode resonator Download PDFInfo
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- CN104409808A CN104409808A CN201410691241.5A CN201410691241A CN104409808A CN 104409808 A CN104409808 A CN 104409808A CN 201410691241 A CN201410691241 A CN 201410691241A CN 104409808 A CN104409808 A CN 104409808A
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Abstract
The invention discloses a multi-bandpass filter based on a multimode resonator and mainly solves the problem of large size and poor performance of the multi-bandpass filter. The multi-bandpass filter based on the multimode resonator comprises a micro-strip dielectric substrate (1), a metal earth plate (2), a resonator (3) and an input-output feeder line (4). The resonator (3) is composed of two identical five-mode resonators which are staggered, each five-mode resonator is composed of a short-circuit branch (31), an open-circuit branch (32), a U-shaped microstrip line (33), a bulged loop (34) and L-shaped open-circuit branches (35 and 36). The symmetric center of the bulged loop (34) is superposed with that of the U-shaped microstrip line, and the top end of the bulged loop is connected with the bottom end of the U-shaped microstrip line. The L-shaped open-circuit branches are connected at the bottom end of the U-shaped microstrip line. The input-output feeder line (4) is composed of a pair of quasi fork-finger type coupled feeder lines. The size of the multi-bandpass filter can be reduced, design complexity is reduced, bandpass selectivity is improved, and the multi-bandpass filter can be used for a wireless communication system.
Description
Technical field
The invention belongs to technical field of electronic devices, particularly a kind of design of micro-band comb filter, can be used for wireless communication system radio-frequency front-end.
Background technology
Microwave filter is the indispensable important component parts such as communication system, radar system, measuring system, and therefore, microwave filter is emphasis and the focus of Research of wireless communication systems always.Modern wireless communication systems requires that frequency range that radio-frequency devices is operated in multiple separation realizes the demand of different business with satisfied use multimode terminal, by the frequency signal of a multiple discontinuous channel of beam transmission.This just needs to use comb filter to suppress spuious noise signal.In the past, in order to realize multiband communication, each frequency range needs independently filter, and this makes whole system volume and power consumption comparatively large, and cost is higher.If the design of filter of radio-frequency front-end is become multiband form, greatly can reduce the volume of system, cost and power consumption, strengthen its reliability, promote that communication system is to miniaturized, high integration development.
In order to meet this demand, the design of comb filter is devoted in a lot of research work, in May, 2010 Cheng, C.-M. wait people on IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS periodical, delivered four pass filters adopting defect ground structure to realize, but defect ground structure can make the integrality of filter ground plate signal when encapsulating be affected; In April, 2011 Hung-Wei, W.and Y.Ru-Yuan has delivered four pass filters that the asymmetrical step electric impedance resonator of employing realizes on IEEEMICROWAVE AND WIRELESS COMPONENTS LETTERS periodical, but makes the size of circuit become larger because its design employs more resonator; In July, 2012, Chi-Feng Chen delivered the five frequency filters based on three mould minor matters load step electric impedance resonators on IEEE MICROWAVE AND WIRELESSCOMPONENTS LETTERS periodical, but this filter insertion loss is excessive, affect its application; In September, 2013, the people such as J.Xu delivered multiple comb filters of the step electric impedance resonator design adopting open circuit minor matters to load on IEEETRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES periodical, but the selectivity of filter passband can not be satisfactory.
Summary of the invention
The object of the invention is the deficiency for above-mentioned prior art, proposes a kind of comb filter based on multimode resonator, to reduce the volume of filter, improves the performance of filter.
For achieving the above object, the present invention provides the following two kinds technical scheme:
Technical scheme one:
Based on a comb filter for multimode resonator, comprise micro-band medium substrate 1, metal ground plate 2, resonator 3, input and output feeder line 4, metal ground plate is provided with ground hole 5, it is characterized in that:
Described input and output feeder line 4, it is aimed at interdigitation coupling feed by one and forms, and every bar feeder line comprises two interdigital minor matters, 41,42 and one section of 50 ohm microstrip 43; The parallel same one end being connected to 50 ohm microstrip 43 of interdigital minor matters 41,42;
Described resonator 3, it is made up of two that are staggeredly placed identical four mould resonators, and each four mould resonators are made up of short circuit minor matters 31, open circuit minor matters 32, U-shaped microstrip line 33 and a convex ring 34; Short circuit minor matters 31 are positioned at the U-shaped microstrip line symmetrical centre inside convex type ring 34, and open circuit minor matters 32 are positioned at the U-shaped microstrip line symmetrical centre outside convex type ring 34; The upper end A of U-shaped microstrip line 33 is parallel is placed in interdigital minor matters 41, and between 42, lower end B is parallel to be placed in inside feeder line 4; The symmetrical centre of convex ring 34 overlaps with the symmetrical centre of U-shaped microstrip line 33, and the top of convex ring 34 is connected with the bottom C of U-shaped microstrip line.
Technical scheme two:
Based on a comb filter for multimode resonator, comprise micro-band medium substrate 1, metal ground plate 2, resonator 3, input and output feeder line 4, metal ground plate is provided with ground hole 5, it is characterized in that:
Described input and output feeder line 4, it is aimed at interdigitation coupling feed by one and forms, and every bar feeder line comprises two interdigital minor matters, 41,42 and one section of 50 ohm microstrip 43; The parallel same one end being connected to 50 ohm microstrip 43 of interdigital minor matters 41,42;
Described resonator 3, it is made up of two that are staggeredly placed identical five mould resonators, and each five mould resonators are made up of short circuit minor matters 31, open circuit minor matters 32, U-shaped microstrip line 33, convex ring 34 and two L shapes minor matters 35,36 of opening a way; Short circuit minor matters 31 are positioned at the U-shaped microstrip line symmetrical centre inside convex type ring 34, and open circuit minor matters 32 are positioned at the U-shaped microstrip line symmetrical centre outside convex type ring 34; The upper end A of U-shaped microstrip line 33 is parallel is placed in interdigital minor matters 41, and between 42, lower end B is parallel to be placed in inside feeder line 4; The symmetrical centre of convex ring 34 overlaps with the symmetrical centre of U-shaped microstrip line 33, and the top of convex ring 34 is connected with the bottom C of U-shaped microstrip line; Two L shape open circuit minor matters 35,36 symmetries are connected on the bottom C of U-shaped microstrip line 33.
The present invention has the following advantages:
1. the present invention designs owing to adopting multimode resonator, makes each filter only just can realize many passband responses with two identical resonators, reduces the overall dimensions of filter, also simplify the complexity of design simultaneously.
2. the present invention is owing to have employed the multimode resonator of minor matters loading form, and the frequency of each mode of resonance can independently be controlled, and adds flexibility and the degree of freedom of design, and easily realizes from four moulds to the transformation of five moulds.
3. the present invention carries out the input and output of energy owing to adopting accurate interdigitation feeder line, makes can form transmission zero in the both sides of each passband, the basis not increasing additional cost improves band external characteristic, make each passband have good selectivity.
4. the present invention is owing to have employed complete metal ground plate, can not affect the integrality of ground plate signal when carrying out the encapsulation of filter.
Accompanying drawing explanation
Fig. 1 is first embodiment of the present invention structure chart;
Fig. 2 is the end view of Fig. 1;
Fig. 3 is second embodiment of the present invention structure chart;
Fig. 4 is the end view of Fig. 3;
Fig. 5 is the transmission characteristic to first embodiment of the invention | S21| and return loss | and S11| emulation and test curve figure;
Fig. 6 is the transmission characteristic to second embodiment of the invention | S21| and return loss | and S11| emulation and test curve figure.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated:
First embodiment: design size is four pass filters of 27.5mm × 23mm.
See figures.1.and.2, four passband band pass filters of the present invention are primarily of micro-band medium substrate 1, and metal ground plate 2, resonator 3, input and output feeder line 4, ground hole 5 forms.Wherein:
Micro-band medium substrate 1 adopts dielectric constant to be 2.2, and thickness is the double face copper of 1.0mm, is metal ground plate 2 below double face copper, is four mould resonators 3, input and output feeder line 4 and ground hole 5 above double face copper.Wherein:
Described input and output feeder line 4 is aimed at interdigitation coupling feed by one and is formed, and every bar feeder line comprises 2 interdigital minor matters, 41,42 and one section of 50 ohm microstrip 43; The parallel same one end being connected to 50 ohm microstrip 43 of interdigital minor matters 41,42; This is 13mm to the length of interdigital minor matters 41,42, and wide is 0.76mm, these two interdigital minor matters 41, and the distance between 42 is 1.48mm; The length of 50 ohm microstrip 43 is 6mm, and wide is 3mm.
Described resonator 3, it is made up of two that are staggeredly placed identical four mould resonators.Each four mould resonators by short circuit minor matters 31, open circuit minor matters 32, U-shaped microstrip line 33 and a convex ring 34 are formed; Short circuit minor matters 31 are positioned at the U-shaped microstrip line symmetrical centre inside convex type ring 34, and the length of short circuit minor matters 31 is 4.1mm, and wide is 0.5mm; Open circuit minor matters 32 are positioned at the U-shaped microstrip line symmetrical centre outside convex type ring 34, and the length of open circuit minor matters 32 is 7mm, and wide is 1.5mm; The upper end A of U-shaped microstrip line 33 is parallel is placed in interdigital minor matters 41, between 42; The symmetrical centre of convex ring 34 overlaps with the symmetrical centre of U-shaped microstrip line 33, and the top of convex ring 34 is connected with the bottom C of U-shaped microstrip line 33.
Described U-shaped microstrip line 33, its upper end A is parallel to feeder line 4, and length is 13mm, and wide is 1.0mm, and its lower end B is parallel to feeder line 4, and length is 13mm, and wide is 1.0mm, and its bottom C is perpendicular to feeder line 4, and length is 16.5mm, and wide is 1.0mm; The total length of this U-shaped microstrip line 33 is 42.5mm, and the distance of its upper end A and interdigital minor matters 41,42 is 0.24mm, and the distance of its upper end A and 50 ohm microstrip (43) is 2.5mm.
Described convex ring 34, is interconnected by upper and lower three parallel lines and upper and lower two pairs of vertical lines and forms, wherein go up parallel lines L
1length be 2.5mm, wide is 1mm; Lower parallel lines L
5length be 12.5mm, wide is 0.5mm; Intermediate parallel line L
3length be L
5-L
1, wide is 0.5mm; Article two, upper vertical line L
2length be all 3mm, wide is all 0.5mm; Article two, lower vertical line L
4length be all 2.5mm, wide is all 0.5mm; Described two upper vertical line L
2be connected with U-shaped microstrip line 33.
Described ground hole 5 for radius be the metallization via hole of 0.25mm.
Second embodiment: design size is the five-way band filter of 29mm × 22.9mm.
With reference to Fig. 3 and Fig. 4, five-way band band pass filter of the present invention is primarily of micro-band medium substrate 1, and metal ground plate 2, resonator 3, input and output feeder line 4, ground hole 5 forms.Wherein:
Micro-band medium substrate 1 adopts dielectric constant to be 2.2, and thickness is the double face copper of 1.0mm, is metal ground plate 2 below double face copper, is five mould resonators 3, input and output feeder line 4 and ground hole 5 above double face copper.Wherein:
Described input and output feeder line 4, aim at interdigitation coupling feed by one and form, every bar feeder line comprises 2 interdigital minor matters, 41,42 and one section of 50 ohm microstrip 43; The parallel same one end being connected to 50 ohm microstrip 43 of interdigital minor matters 41,42; The length of interdigital minor matters 41,42 is 13mm, and wide is 0.76mm, two interdigital minor matters 41, and the distance between 42 is 1.48mm; The length of 50 ohm microstrip 43 is 7mm, and wide is 3mm.
Described resonator 3, it is made up of two that are staggeredly placed identical five mould resonators, and each five mould resonators are made up of short circuit minor matters 31, open circuit minor matters 32, U-shaped microstrip line 33, convex ring 34 and two L shapes minor matters 35,36 of opening a way; Short circuit minor matters 31 are positioned at the U-shaped microstrip line symmetrical centre inside convex type ring 34, and the length of short circuit minor matters 31 is 4.1mm, and wide is 0.5mm; Open circuit minor matters 32 are positioned at the U-shaped microstrip line symmetrical centre outside convex type ring 34, and the length of open circuit minor matters 32 is 7mm, and wide is 1.5mm; The upper end A of U-shaped microstrip line 33 is parallel is placed in interdigital minor matters 41, and between 42, lower end B is parallel to be placed in inside feeder line 4; The symmetrical centre of convex ring 34 overlaps with the symmetrical centre of U-shaped microstrip line 33, and the top of convex ring 34 is connected with the bottom C of U-shaped microstrip line; Two L shape open circuit minor matters 35,36 symmetries are connected on the bottom C of U-shaped microstrip line 33.
Described U-shaped microstrip line 33, its upper end A is parallel to feeder line 4, and its length is 13mm, and wide is 1.0mm, and its lower end B is parallel to feeder line 4, and length is 13mm, and wide is 1.0mm, and its bottom C is perpendicular to feeder line 4, and length is 16.5mm, and wide is 1.0mm; The total length of this U-shaped microstrip line 33 is 42.5mm, and the distance of U-shaped microstrip line 33 upper end A and interdigital minor matters 41,42 is 0.24mm.
Described L shape open circuit minor matters 35,36, its length being parallel to U-shaped microstrip line 33 bottom part is 5.75mm, and wide is 0.4mm; Its distance perpendicular to U-shaped microstrip line 33 bottom part and U-shaped microstrip line (33) symmetrical centre is 2.5mm, and it is long is 2.25mm, and wide is 0.4mm.
Described convex ring 34, is interconnected by upper and lower three parallel lines and upper and lower two pairs of vertical lines and forms, wherein go up parallel lines L
1length be 4.2mm, wide is 1mm; Lower parallel lines L
5length be 9.8mm, wide is 1mm; Intermediate parallel line L
3length be L
5-L
1, wide is 0.2mm; Article two, upper vertical line L
2length be all 3mm, wide is all 0.2mm; Article two, lower vertical line L
4length be all 3mm, wide is all 0.2mm; Described two upper vertical line L
2be connected with U-shaped microstrip line 33.
Described ground hole 5 for radius be the metallization via hole of 0.25mm.
Effect of the present invention further illustrates by following emulation and test experiments:
Emulation 1. emulates first embodiment of the invention in 3 D electromagnetic simulation software HFSS, and the four pass filter response curves obtained are as shown in Fig. 5 dotted line.
Emulation 2. emulates second embodiment of the invention in 3 D electromagnetic simulation software HFSS, and the five-way band filter response curve obtained is as shown in Fig. 6 dotted line.
Test 1. utilizes vector network analyzer to test four pass filters processed, and the four pass filter response curves obtained are as shown in Fig. 5 solid line.
Test 2. utilizes vector network analyzer to test the five-way band filter processed, and the five-way band filter response curve obtained is as shown in Fig. 6 solid line.
As can be seen from the response curve of four pass filters of Fig. 5, four pass filters of the first embodiment respectively define a passband at 1.57GHz, 2.5GHz, 3.5GHz, 5.2GHz place, each logical in-band insertion loss is respectively 1.0dB, 0.33dB, 1.33dB, 1.9dB, in band, return loss all can reach more than 20dB, and respectively have a transmission zero in each passband both sides, make each passband have good selectivity.
As can be seen from the response curve of the five-way band filter of Fig. 6, the five-way band filter of the second embodiment respectively defines a passband at 1.57GHz, 2.5GHz, 3.5GHz, 5.2GHz, 5.9GHz place, each logical in-band insertion loss is respectively 1.0dB, 0.4dB, 1.1dB, 1.6dB, 1.9dB, in band, return loss all can reach more than 16dB, and respectively have a transmission zero in each passband both sides, make each passband have good selectivity.
Above-mentioned example is the preferred embodiments of the present invention, does not form any limitation of the invention.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Claims (9)
1., based on a comb filter for multimode resonator, comprise micro-band medium substrate (1), metal ground plate (2), resonator (3), input and output feeder line (4), metal ground plate is provided with ground hole (5), it is characterized in that:
Described input and output feeder line (4), it is aimed at interdigitation coupling feed by one and forms, and every bar feeder line comprises two interdigital minor matters (41,42) and one section of 50 ohm microstrip (43); The parallel same one end being connected to 50 ohm microstrip (43) of interdigital minor matters (41,42);
Described resonator (3), it is made up of two that are staggeredly placed identical four mould resonators, and each four mould resonators are made up of short circuit minor matters (31), open circuit minor matters (32), U-shaped microstrip line (33) and a convex ring (34); Short circuit minor matters (31) are positioned at the U-shaped microstrip line symmetrical centre of convex type ring (34) inner side, and open circuit minor matters (32) is positioned at the U-shaped microstrip line symmetrical centre in convex type ring (34) outside; The upper end A of U-shaped microstrip line (33) is parallel to be placed between interdigital minor matters (41,42), and lower end B is parallel is placed in feeder line (4) inner side; The symmetrical centre of convex ring (34) overlaps with the symmetrical centre of U-shaped microstrip line (33), and the top of convex ring (34) is connected with the bottom C of U-shaped microstrip line.
2. the comb filter based on multimode resonator according to claim 1, is characterized in that, the length of interdigital minor matters (41,42) is 13mm, and wide is 0.76mm, and the distance between two interdigital minor matters (41,42) is 1.48mm; The length of 50 ohm microstrip (43) is 6mm, and wide is 3mm.
3. the comb filter based on multimode resonator according to claim 1, is characterized in that, the length of short circuit minor matters (31) is 4.1mm, and wide is 0.5mm; The length of open circuit minor matters (32) is 7.0mm, and wide is 1.5mm.
4. the comb filter based on multimode resonator according to claim 1, is characterized in that, the upper end A of U-shaped microstrip line (33) is parallel to feeder line (4), and it is long is 13mm, and wide is 1.0mm; The lower end B of U-shaped microstrip line (33) is parallel to feeder line (4), and it is long is 13mm, and wide is 1.0mm; The bottom C of U-shaped microstrip line (33) is perpendicular to feeder line (4), and it is long is 16.5mm, and wide is 1.0mm; The total length of U-shaped microstrip line (33) is 42.5mm; The distance of U-shaped microstrip line (33) upper end A and interdigital minor matters (41,42) is 0.24mm, and the distance of itself and 50 ohm microstrip (43) is 2.5mm.
5. the comb filter based on multimode resonator according to claim 1, is characterized in that, convex ring (34) is interconnected by upper and lower three parallel lines and upper and lower two pairs of vertical lines and forms, and wherein goes up parallel lines L
1length be 2.5mm, wide is 1mm; Lower parallel lines L
5length be 12.5mm, wide is 0.5mm; Intermediate parallel line L
3length be L
5-L
1, wide is 0.5mm; Article two, upper vertical line L
2length be all 3mm, wide is all 0.5mm; Article two, lower vertical line L
4length be all 2.5mm, wide is all 0.5mm; Described two upper vertical line L
2be connected with U-shaped microstrip line (33).
6., based on a comb filter for multimode resonator, comprise micro-band medium substrate (1), metal ground plate (2), resonator (3), input and output feeder line (4), metal ground plate is provided with ground hole (5), it is characterized in that:
Described input and output feeder line (4), it is aimed at interdigitation coupling feed by one and forms, and every bar feeder line comprises two interdigital minor matters (41,42) and one section of 50 ohm microstrip (43); The parallel same one end being connected to 50 ohm microstrip (43) of interdigital minor matters (41,42);
Described resonator (3), it is made up of two that are staggeredly placed identical five mould resonators, each five mould resonators are made up of short circuit minor matters (31), open circuit minor matters (32), U-shaped microstrip line (33), a convex ring (34) and two L shapes open circuit minor matters (35,36); Short circuit minor matters (31) are positioned at the U-shaped microstrip line symmetrical centre of convex type ring (34) inner side, and open circuit minor matters (32) is positioned at the U-shaped microstrip line symmetrical centre in convex type ring (34) outside; The upper end A of U-shaped microstrip line (33) is parallel to be placed between interdigital minor matters (41,42), and lower end B is parallel is placed in feeder line (4) inner side; The symmetrical centre of convex ring (34) overlaps with the symmetrical centre of U-shaped microstrip line (33), and the top of convex ring (34) is connected with the bottom C of U-shaped microstrip line; Two L shape open circuit minor matters (35,36) symmetries are connected on the bottom C of U-shaped microstrip line (33).
7. the comb filter based on multimode resonator according to claim 6, is characterized in that, the length that L shape open circuit minor matters (35,36) is parallel to U-shaped microstrip line (33) bottom part is 5.75mm, and wide is 0.4mm; L shape open circuit minor matters (35,36) is 2.5mm perpendicular to the distance of U-shaped microstrip line (33) bottom part and U-shaped microstrip line (33) symmetrical centre, and it is long is 2.25mm, and wide is 0.4mm.
8. the comb filter based on multimode resonator according to claim 6, is characterized in that, the length of short circuit minor matters (31) is 4.1mm, and wide is 0.7mm; The length of open circuit minor matters (32) is 4.5mm, and wide is 1mm.
9. the comb filter based on multimode resonator according to claim 6, is characterized in that, convex ring (34) is interconnected by upper and lower three parallel lines and upper and lower two pairs of vertical lines and forms, and wherein goes up parallel lines L
1length be 4.2mm, wide is 1mm; Lower parallel lines L
5length be 9.8mm, wide is 1mm; Intermediate parallel line L
3length be L
5-L
1, wide is 0.2mm; Article two, upper vertical line L
2length be all 3mm, wide is all 0.2mm; Article two, lower vertical line L
4length be all 3mm, wide is all 0.2mm; Described two upper vertical line L
2be connected with U-shaped microstrip line (33).
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| CN106159393A (en) * | 2015-04-08 | 2016-11-23 | 中兴通讯股份有限公司 | A kind of wave filter |
| CN105024124A (en) * | 2015-08-13 | 2015-11-04 | 电子科技大学 | Microstrip ultra-wide-band band-pass filter based on novel multi-branch multi-mode resonator |
| CN105024124B (en) * | 2015-08-13 | 2018-03-06 | 电子科技大学 | A kind of new more minor matters multimode resonators and the micro band superwide band bandpass filter based on it |
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| CN107086347A (en) * | 2016-02-16 | 2017-08-22 | 青岛海尔电子有限公司 | Four mould defects ground formula resonator |
| CN107086338A (en) * | 2016-02-16 | 2017-08-22 | 青岛海尔电子有限公司 | Four mould defects ground formula wave filter |
| WO2018171179A1 (en) * | 2017-03-18 | 2018-09-27 | 深圳市景程信息科技有限公司 | Dual-band bandpass filter with high selectivity |
| CN108631745B (en) * | 2017-03-21 | 2022-04-22 | 太阳诱电株式会社 | Multiplexer |
| CN108631745A (en) * | 2017-03-21 | 2018-10-09 | 太阳诱电株式会社 | Multiplexer |
| CN107546446A (en) * | 2017-07-18 | 2018-01-05 | 电子科技大学 | The changeable reconfigurable filter of the more passbands of multimode |
| CN107482290A (en) * | 2017-08-11 | 2017-12-15 | 华中科技大学 | A kind of more passband bandpass filters |
| CN108509749B (en) * | 2018-04-18 | 2021-08-24 | 电子科技大学 | Design method of dual-passband power amplifier |
| CN108509749A (en) * | 2018-04-18 | 2018-09-07 | 电子科技大学 | A kind of dual-passband Designing power amplifier method |
| CN111682292A (en) * | 2020-06-02 | 2020-09-18 | 南京师范大学 | Four-way band-pass power division filter based on four-mode resonator |
| 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 |
| CN115513620A (en) * | 2022-09-23 | 2022-12-23 | 中国科学院物理研究所 | Microstrip graphic layer, preparation method thereof and extremely-wide-band-resistance high-rejection band-pass filter |
| CN115513620B (en) * | 2022-09-23 | 2023-10-31 | 中国科学院物理研究所 | Microstrip pattern layer, preparation method thereof and ultra-wide stop band-pass filter |
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