CN101853975B - Low-loss band-pass filter based on defected ground structure - Google Patents
Low-loss band-pass filter based on defected ground structure Download PDFInfo
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- CN101853975B CN101853975B CN201010157143.5A CN201010157143A CN101853975B CN 101853975 B CN101853975 B CN 101853975B CN 201010157143 A CN201010157143 A CN 201010157143A CN 101853975 B CN101853975 B CN 101853975B
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Abstract
The invention discloses a low-loss band-pass filter based on a defected ground structure. A pair of folded type feeder structures (5) and (6) is adopted on micro-strip transmission lines matched at 50 ohmage impedance at the upper layer of the filter; a pair of T-type loading capacitors (3) and (4) is loaded; and a concave defected ground structure (DGS) is adopted on the horizontal plane of the filter. The folded type feeders (5) and (6) are coupled through a gap (7); and an input micro-strip transmission line (1) and an output micro-strip transmission line (2) are coupled through a gap (10). The invention adopts symmetric folded type feeder structures; the T-type loading capacitors and the concave DGS simplify the processing complexity and generate two transmission zeros around a passband; in addition, the concave DGS improves the inhibition of a filter rejection band which can inhibit the influence of surface waves and ultraharmonics, thereby obtaining better frequency selectivity. The invention has compact and tiny design, is easy to integrate, and can be used in a dense integrated circuit conveniently.
Description
Technical field
The present invention relates to a kind of low-loss band-pass filter of defect ground structure, belong to microwave transmission device technical field.
Background technology
Along with mobile communication, satellite communication, radar and wireless telemetry constantly develop, system has proposed more and more higher requirement to the design of the microwave of radio frequency receiving and transmitting front end, radio-frequency filter.Microstrip filter, because size own is little, processed complex degree is relatively low, quality light and be easy to the advantages such as integrated, has obtained being widely used in the circuit such as microwave integrated circuit (MIC).
In the evolution of communication technology of satellite, requirement to frequency range, bandwidth is more and more higher, the design of wideband microband band pass filter is increasingly important also, the band pass filter of S-band particularly, also requires its relative bandwidth to reach more than 30% requiring that microstrip structure is simple, in size decreases.
Adopt the existing open report of band pass filter of defect ground structure, as publication number CN101459269 discloses a kind of low pass filter based on defect ground structure, this filter comprise medium substrate, metal wire, grounding plate and on grounding plate etched defect ground structure, defect ground structure is to be connected to form by a rectangle link slot by two symmetrical fan grooves; Publication number CN101308946 discloses a kind of wideband microband coupler based on Novel Defected Ground Structure, and this coupler comprises: defect ground structure, microstrip structure signals layer and port.But in prior art, there is not yet the novel filter structure of fold-type feeder line, T-shaped loading capacitance and " recessed " type defect ground structure (DGS) combination.
Fold-type feeder line, T-shaped loading capacitance and " recessed " type DGS are novel filter structures, it has not only realized simple in structure, the feature of miniaturization, and compared with traditional microstrip bandpass filter, passband and stopband characteristic are better, it has lower insertion loss, can also improve filter stop bend and suppress ability, and overcome the interference of surface wave and higher harmonic components.Also by the position of mobile fold-type feeder line suitable in 50 ohm microstrip, can change the working frequency range of S-band low-loss band-pass filter simultaneously.
Summary of the invention
The object of the invention is, a kind of simple in structure in order to realize, can produce the band pass filter of S-band, the present invention proposes a kind of novel folding type feeder line structure that adopts on the microstrip transmission line of 50 ohms impedance match, and loaded on this basis a pair of T-shaped loading capacitance, on ground level, adopt the band pass filter of " recessed " type defect ground structure (DGS), the filter of gained is not only simple in structure, be easy to processing, and can effectively at passband, produce 2 transmission zeros around, low-loss, improve filter stop bend simultaneously and suppressed ability and the interference that overcomes surface wave and higher harmonic components.
Technical scheme of the present invention is, on the microstrip transmission line of filter upper strata 50 ohms impedance match, adopt a folding type feeder line structure and loaded on this basis a pair of T-shaped loading capacitance, and adopt " recessed " type defect ground structure (DGS) on filter ground level.
Figure 1 shows that the structure chart of T-shaped loading capacitance, its design feature is can select arbitrarily the size of T-shaped loading capacitance and obtain different loading capacitance amounts.
Shown in Fig. 2, be the fold-type feeder line structure on the microstrip transmission line of 50 ohms impedance match, and loaded on this basis a T-shaped loading capacitance.In figure, (3) are T-shaped loading capacitance, and (1) is the input microstrip transmission line of 50 ohm, and (5) are fold-type feeder line structure, and T-shaped loading capacitance loads on input microstrip transmission line (1).
Figure 3 shows that a kind of low-loss band-pass filter superstructure figure based on defect ground structure of the present invention, on the microstrip transmission line of 50 ohms impedance match, adopt a folding type feeder line structure and loaded on this basis a pair of T-shaped loading capacitance; In 50 ohm microstrip, change the working frequency range that its loading position can change filter.
Input transmission line (1) is coupled to output transmission line (2) by gap (10); T-shaped loading capacitance (3), (4) are carried in respectively on input transmission line (1) and output transmission line (2); Fold-type feeder line (5) is coupled by gap (8) with the input transmission line (1) that has loaded T-shaped loading capacitance (3); Fold-type feeder line (6) is coupled by gap (9) with the output transmission line (2) that has loaded T-shaped loading capacitance (4); Fold-type feeder line (5) and fold-type feeder line (6) are by gap (7) coupling.By adjusting the size in the coupling gap (7) between input and output transmission line and filter, coupling coefficient that can accommodation zone bandpass filter.
Figure 4 shows that a kind of low-loss band-pass filter based on defect ground structure of the present invention adopts the overall structure figure of " recessed " type defect ground structure (DGS), this defect ground structure consists of (11), (12), (13), (14), (15), (16), (17), (18), between defect ground (11) and (12), be provided with gap (20), between defect ground (18) and (11) and (12), be provided with gap (19).
The variation of " recessed " type defect ground structure (DGS) size can affect the Out-of-band rejection ability of filter; Distance between " recessed " type defect ground structure plane and filter superstructure is 0.8mm.
The present invention's beneficial effect is compared with the prior art, the present invention is not increasing under the prerequisite of circuit area, adopt a kind of fold-type feeder line structure of symmetry, T-shaped loading capacitance and " recessed " type DGS not only to simplify processed complex degree, at passband, around produce 2 transmission zeros but also DGS structure and improved filter stop bend and suppress ability---suppress surface wave and high order harmonic component and disturb, thereby obtained the selectivity of good frequency.
Of the present invention compact to design, small, be easy to integratedly, be applicable to use in the intensive integrated circuit of microwave communication circuit.
Accompanying drawing explanation
Fig. 1 is the structure chart of T-shaped loading;
Fig. 2 adopts a fold-type feeder line structure on the microstrip transmission line of 50 ohms impedance match, and has loaded on this basis the structure chart of a T-shaped loading capacitance;
Fig. 3 adopts a folding type feeder line structure on the microstrip transmission line of 50 ohms impedance match, and has loaded on this basis the structure chart of a pair of T-shaped loading capacitance
Fig. 4 is the overall structure figure that adopts " recessed " type defect ground structure (DGS);
Fig. 5 is a kind of low-loss band-pass filter upper strata overall dimensions figure based on defect ground structure of the embodiment of the present invention;
Fig. 6 is the overall dimensions figure of a kind of low-loss band-pass filter DGS layer based on defect ground structure of the embodiment of the present invention;
In figure: (1) is the input microstrip transmission line of 50 ohm; (2) be the output microstrip transmission line of 50 ohm; (3) be first T-shaped loading capacitance; (4) be second T-shaped loading capacitance; (5) be first fold-type feeder line structure; (6) be second fold-type feeder line structure; (7) be the coupling gap between structure (5) and (6); (8) be the coupling gap between input transmission line (1) and structure (5); (9) be the coupling gap between output transmission line (2) and structure (6); (10) be the coupling gap between input transmission line (1) and output transmission line (2); (11), (12), (13), (14), (15), (16), (17), (18), (21) form " recessed " type defect ground structure; (19) be defect gap between (18) and defect ground (11), (12); (20) be defect gap between (11) and defect ground (12).
Embodiment
On the microstrip transmission line of the low-loss band-pass filter of the embodiment of the present invention based on defect ground structure by 50 ohms impedance match, adopt a fold-type feeder line structure, and loaded on this basis the superstructure of a T-shaped loading capacitance and earth construction (DGS) composition on " recessed " type defect ground.
Fig. 5 and Fig. 6 are respectively the low-loss band-pass filter upper strata overall dimensions figure of the embodiment of the present invention based on defect ground structure and the overall dimensions figure of DGS layer.
In the low-loss band-pass filter upper strata of the present embodiment based on defect ground structure, T-shaped loading capacitance top is of a size of 3.20mm * 1.20mm, bottom is of a size of 2.25mm * 1.20mm, two loading capacitances load on respectively apart from input transmission line or output 5.10mm place, transmission line end, and the coupling gap between input transmission line and output transmission line is 0.20mm; The housing of fold-type feeder line structure is of a size of 5.80mm * 6.25mm, inside casing is of a size of 5.40mm * 5.75mm, coupling gap between two fold-type feeder line structures is 0.40mm, first fold-type feeder line structure is apart from input transmission line end 2.30mm, and two fold-type feeder line one end are 0.25mm apart from the coupling gap between input and output transmission line; Two coupling feed width in two fold-type feeder line structures are 0.40mm, and other coupling feed width in two fold-type feeder line structures is 0.50mm.
In the low-loss band-pass filter DGS layer of the present embodiment based on defect ground structure, defect ground profile is of a size of 12.20mm * 7.90mm, the width on defect ground (11) and (12) is 1.50mm, defect ground (13), (14) and the width of (21) be 0.60mm, the length on defect ground (17) is 4.50, width is 1.20mm, defect ground (18) length be 1.00, width is 0.40mm, not defect gap between defect ground (11) and defect ground (12) is that (20) are 0.20mm, not defect gap between defect ground (18) and defect ground (11) and (12) is 0.25mm, defect ground (15) and (16) is of a size of 0.5mm * 0.5mm.
Owing to adopting fold-type feeder line and T-shaped loading capacitance symmetrical structure, it is 2.57GHZ that this structure successfully produces a centre frequency, bandwidth is the passband of 0.63GHZ, and has produced two limits at 2.48GHz and 2.65GHz place, return loss is also down to-and below 22dB.In concrete enforcement, by adjusting the width of coupling gap width between this folding type feeder line and " recessed " type DGS, make the passband both sides in this filtering characteristic become more precipitous, relative bandwidth can reach 40% left and right, can obtain good frequency selectivity, and strengthen output signal characteristics.
Claims (3)
1. the low-loss band-pass filter based on defect ground structure, is characterized in that, possesses:
Filter upper strata adopts a folding type feeder line structure and has loaded on this basis a pair of T-shaped loading capacitance on the microstrip transmission line of 50 ohms impedance match; On filter ground level, adopt " recessed " type defect ground structure (DGS);
The input transmission line (1) of described filter is coupled to output transmission line (2) by gap (10); It is upper that first T-shaped loading capacitance (3) is carried in input transmission line (1), and second T-shaped loading capacitance (4) is carried on output transmission line (2); Fold-type feeder line (5) is coupled by gap (8) with the input transmission line (1) that has loaded T-shaped loading capacitance (3); Fold-type feeder line (6) is coupled by gap (9) with the output transmission line (2) that has loaded T-shaped loading capacitance (4); Fold-type feeder line (5) and fold-type feeder line (6) are by gap (7) coupling; Defect ground (11), defect ground (12), defect ground (13), defect ground (14), defect ground (15), defect ground (16), defect ground (17) and defect ground (18) form " recessed " type defect ground structure, gap (20) be defect gap between (11) and defect ground (12), gap (19) be defect (18) and defect ground (11) and defect the gap between (12).
2. the low-loss band-pass filter based on defect ground structure according to claim 1, is characterized in that, described fold-type feeder line structure changes the working frequency range that its loading position can change filter in 50 ohm microstrip.
3. the low-loss band-pass filter based on defect ground structure according to claim 1, is characterized in that, described " recessed " type defect ground structure (DGS), and the variation of its size can affect the Out-of-band rejection ability of filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201010157143.5A CN101853975B (en) | 2010-04-27 | 2010-04-27 | Low-loss band-pass filter based on defected ground structure |
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| CN201010157143.5A CN101853975B (en) | 2010-04-27 | 2010-04-27 | Low-loss band-pass filter based on defected ground structure |
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| CN101853975A CN101853975A (en) | 2010-10-06 |
| CN101853975B true CN101853975B (en) | 2014-02-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101989672A (en) * | 2010-10-18 | 2011-03-23 | 华东交通大学 | Novel DGW band-pass filter |
| CN104577268B (en) * | 2015-01-04 | 2017-06-06 | 华南理工大学 | Plane low pass band logical triplexer |
| EP3754780B1 (en) | 2019-06-17 | 2022-07-27 | Carrier Corporation | A microstrip dc block |
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| KR100691472B1 (en) * | 2006-02-03 | 2007-03-12 | 삼성전자주식회사 | Dc block with band-notch characteristic using a defected ground structure |
| CN1901274B (en) * | 2006-07-27 | 2010-11-03 | 上海交通大学 | Super wide band plane microstrip filter |
| TWI371134B (en) * | 2008-08-29 | 2012-08-21 | Univ Nat Taiwan | Common mode wave filter device and method applicable to defected ground structure |
| CN101692512B (en) * | 2009-09-28 | 2012-08-01 | 长安大学 | Ultra wide band bandpass filter based on ground defective grounding structure |
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Inventor after: Liu Yuanyuan Inventor after: Gao Xiaohui Inventor after: Huang Dechang Inventor after: Liu Haiwen Inventor after: Zhu Lu Inventor after: Guan Xuehui Inventor after: Zhang Yuejin Inventor after: Wang Chuanyun Inventor after: Zhang Zhili Inventor after: Wen Pin Inventor before: Huang Dechang Inventor before: Liu Haiwen Inventor before: Zhu Lu Inventor before: Guan Xuehui Inventor before: Zhang Yuejin Inventor before: Wang Chuanyun Inventor before: Zhang Zhili Inventor before: Wen Pin Inventor before: Gao Xiaohui |
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Free format text: CORRECT: INVENTOR; FROM: HUANG DECHANG LIU HAIWEN ZHU LU GUAN XUEHUI ZHANG YUEJIN WANG CHUANYUN ZHANG ZHICHONG WEN PIN GAO XIAOHUI TO: LIU YUANYUAN HUANG DECHANG LIU HAIWEN ZHU LU GUAN XUEHUI ZHANG YUEJIN WANG CHUANYUN ZHANG ZHICHONG WEN PIN GAO XIAOHUI |
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