CN203039050U - Microstrip bandpass filter based on defected-ground stepped impedance resonator - Google Patents

Microstrip bandpass filter based on defected-ground stepped impedance resonator Download PDF

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Publication number
CN203039050U
CN203039050U CN 201220743760 CN201220743760U CN203039050U CN 203039050 U CN203039050 U CN 203039050U CN 201220743760 CN201220743760 CN 201220743760 CN 201220743760 U CN201220743760 U CN 201220743760U CN 203039050 U CN203039050 U CN 203039050U
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filter
impedance resonator
bandpass filter
electric impedance
filter based
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CN 201220743760
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田丽
郭枫
刘国高
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Changzhou Campus of Hohai University
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Changzhou Campus of Hohai University
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Abstract

The utility model relates to a microstrip bandpass filter based on a defected-ground stepped impedance resonator and belongs to the microwave communication equipment technology field. The filter takes the defected-ground stepped impedance resonator as a unit. Through a specific layout structure between the resonator units, the resonator units possess a specific coupling characteristic so that a filtering function is realized. A defected-ground stepped impedance resonator structure disturbs a current distribution on a metal grounding plate, changes a microstrip transmission line characteristic, makes the filter generate a transmission zero point and improves an out of band performance of the filter. An input feed line and an output feed line use an excitation line structure to enhance the coupling and are located on a same horizontal line. According to the filter of the utility model, the defected-ground stepped impedance resonator units are used to realize the filter. A size of the filter is smaller than the traditional filter. A principle is concise. Because of defected-ground etching, the filter is easy to be processed. Equivalent circuit modeling is easy. Cost is low and the filter has many other advantages. The filter can be produced in a large scale and widely applied in a miniaturization microwave communication system.

Description

Microstrip bandpass filter based on defect ground step electric impedance resonator
Technical field
The utility model relates to a kind of microwave filter, belongs to the microwave communication equipment technical field.
Background technology
Microwave filter is as a kind of two port microwave networks, it controls the working band of microwave system by its frequency selectivity, be one of modal components and parts in the systems such as radar, radio communication, microwave measurement, the quality of its performance has vital impact to the performance of whole communication system.Fast development along with wireless communication technology, present wireless terminal device needs the radio-frequency devices that can simultaneously be operated in two or more separates frequency bands to support the operation to the different wireless communication system business, for integrated level and the Out-of-band rejection ability that improves the radio-frequency devices working frequency range, have high-frequency optionally radio-frequency devices be the hot issue of microwave circuits and devices designer research always.Introduce transmission zero outside the passband of filter, can improve the frequency selectivity of filter, improve the Out-of-band rejection ability of filter.By etching defect ground resonator structure on microwave filter reverse side metal ground plate, make filter produce transmission zero, can improve the Out-of-band rejection ability of filter, be conducive to the miniaturization of filter.
Defect ground structure (DGS, defected ground structure) is people's at first propositions on the basis of research photon band gap such as Korea S scholar J.I.Park.Change the CURRENT DISTRIBUTION on metal ground plate plane by etching periodicity or acyclic figure on the metal ground plate plane at microwave circuit, change the microstrip transmission line characteristic, as: effective inductance and effective capacitance etc. make the microstrip transmission line consisted of defect ground have slow wave characteristic and band resistance characteristic.Defect ground structure has obvious advantage improving aspect the filter passband characteristic, can be widely used in the microwave circuits such as antenna, filter, power splitter, coupler.Because the etch process requirement of defect ground is low, be easy to the equivalent electric circuit modeling, therefore more be adapted to the miniaturization of microwave device and the development of integrated direction simultaneously.
Tradition coupled structure microstrip bandpass filter, particularly electric coupling structure and hybrid coupled Structure Filter, consist of the metal micro-strip line step electric impedance resonator usually.Due to the frequency response characteristic of microwave circuit, cause filter passband decay edge not precipitous, the passband both sides are without transmission zero, and the Out-of-band rejection ability, reduce the overall performance of filter greatly.
Summary of the invention
For the deficiencies in the prior art, the purpose of this utility model is, a kind of microstrip bandpass filter based on defect ground step electric impedance resonator is provided, and this filter volume is small and exquisite, defect ground etching is easily processed, it is integrated to be convenient to planar circuit.Defect ground step electric impedance resonator structure has upset the CURRENT DISTRIBUTION on the metal ground plate, change the microstrip transmission line characteristic, make the passband of filter produce transmission zero outward, greatly improved the outer performance of band of filter, can promote the use of in the microwave transmitting and receiving communication system of multiple miniaturization.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of microstrip bandpass filter based on defect ground step electric impedance resonator, the metal micro-strip line that comprises front portion, the metal ground plate of reverse side part and the dielectric-slab between metal micro-strip line and metal ground plate, described metal micro-strip line is included in incoming feeder and an output feeder on horizontal line, it is characterized in that: on described metal ground plate, etching has resonator element, described resonator element is positioned at a defect ground step electric impedance resonator on horizontal line by two and constitutes, the inside of described incoming feeder and output feeder is respectively equipped with the excitation line structure that is shaped as " ┓ " or " ┏ ".
The aforesaid microstrip bandpass filter based on defect ground step electric impedance resonator, it is characterized in that: the right-angle side place of described two resonators is provided with respectively open loop, and described open loop place is staggered relatively, and whole filter becomes zhou duicheng tuxing.
The aforesaid microstrip bandpass filter based on defect ground step electric impedance resonator, it is characterized in that: the acute angle place of described two resonators is provided with respectively open loop, and described open loop place is upwards placed, and whole filter becomes zhou duicheng tuxing.
The aforesaid microstrip bandpass filter based on defect ground step electric impedance resonator, it is characterized in that: described resonator is the isosceles right triangle shape.
The aforesaid microstrip bandpass filter based on defect ground step electric impedance resonator is characterized in that: the width of " ┓ " of described incoming feeder and output feeder inside and " ┏ " type excitation line structure is 0.2mm, and left-right symmetric.
The aforesaid microstrip bandpass filter based on defect ground step electric impedance resonator, it is characterized in that: the gap width between described incoming feeder and output feeder is between 0.1mm to 0.3mm.
The aforesaid microstrip bandpass filter based on defect ground step electric impedance resonator, it is characterized in that: described metal micro-strip line and metal ground plate have identical geometric center.
The aforesaid microstrip bandpass filter based on defect ground step electric impedance resonator, it is characterized in that: the material of described metal micro-strip line and metal ground plate is gold, silver or copper.
The beneficial effects of the utility model are:
1. by etching defect ground step electric impedance resonator structure on the metal ground plate plane, upset the CURRENT DISTRIBUTION on metal ground plate, change the microstrip transmission line characteristic, make filter produce transmission zero, improve the Out-of-band rejection ability of filter, improved the performance of filter;
2. the step electric impedance resonator structure, less than conventional metals microstrip line step electric impedance resonator physical dimension with adopting defect, meets the demand for development of Modern Communication System miniaturization;
3. incoming feeder and output feeder load the excitation line structure, be respectively equipped with the border that the defect sturcture that is shaped as " ┓ " or " ┏ " is broken feeder line in the inside of incoming feeder and output feeder, strengthened the coupled characteristic between incoming feeder and output feeder, made filter produce transmission zero;
4. this filter geometry is simple, and principle is simple and clear, and the etching of defect ground easily adds and can guarantee machining accuracy, can applied code, large-scale production.
The accompanying drawing explanation
The size schematic diagram that Fig. 1 is embodiment 1 front incoming feeder and output feeder structure, long measure: mm;
The size schematic diagram that Fig. 2 is embodiment 1 reverse side defect ground step electric impedance resonator structure, long measure: mm;
The S that Fig. 3 is embodiment 1 11the parameters simulation result;
The S that Fig. 4 is embodiment 1 21the parameters simulation result;
The coupling coefficient curve that Fig. 5 is embodiment 1;
The simulation result that Fig. 6 is embodiment 1 and incoming feeder and output feeder are without the comparison diagram of excitation line structure;
The comparison diagram of the simulation result that Fig. 7 is embodiment 1 and metal micro-strip line electric coupling structure;
The operating frequency curve that Fig. 8 is embodiment 1;
The size schematic diagram that Fig. 9 is the positive input and output feeder line structure of embodiment 2, long measure: mm;
The size schematic diagram that Figure 10 is embodiment 2 reverse side defect ground step electric impedance resonator structures, long measure: mm;
The S that Figure 11 is embodiment 2 11the parameters simulation result;
The S that Figure 12 is embodiment 2 21the parameters simulation result;
The coupling coefficient curve that Figure 13 is embodiment 2;
The simulation result that Figure 14 is embodiment 2 and incoming feeder and output feeder are without the comparison diagram of excitation line structure;
The comparison diagram of the simulation result that Figure 15 is embodiment 2 and metal micro-strip line hybrid coupled structure;
The operating frequency curve that Figure 16 is embodiment 2.
In figure, the implication of Reference numeral is: 1. open loop is in an isosceles right triangle defect ground resonator element on right-angle side, 2. open loop is in an isosceles right triangle defect ground resonator element on acute angle, 3. excitation line structure, 4. incoming feeder, 5. output feeder.
Embodiment
Below with two embodiment, the utility model is described in detail; two embodiment are all implemented take technical solutions of the utility model under prerequisite; provided detailed execution mode and concrete operating process, but protection range of the present utility model is not limited to following embodiment 1, embodiment 2.
Embodiment 1: 1 to 8 couple of embodiment 1 of the present utility model is described in detail by reference to the accompanying drawings.As depicted in figs. 1 and 2, this filter comprises: the metal micro-strip line of front portion, the metal ground plate of reverse side part, the dielectric-slab between metal micro-strip line and metal ground plate.Step electric impedance resonator unit 1, defect ground is the etch structures on filter reverse side metal ground plate, to be constituted by two measure-alike step electric impedance resonator unit 1, isosceles right triangle defect ground, two resonator elements are positioned on a horizontal line, open loop place of two resonator elements is located at respectively on a right-angle side, and open loop place is staggered relatively; Described incoming feeder 4 and output feeder 5 are positioned at the filter front, and incoming feeder 4 and output feeder 5 used excitation line structures 3 to strengthen coupling effects, being shaped as of excitation line structure 3 " ┓ " or " ┏ ", and whole filter becomes zhou duicheng tuxing.
Embodiment 1 relative dielectric constant =10.2, thickness hthe dielectric-slab of=1.27mm, through design, emulation and optimization, finally determine the concrete size of this band pass filter as depicted in figs. 1 and 2, l 1 =20mm, l 2 =6mm, l 3 =0.7mm, w 1 =0.2mm, w 2 =0.2mm, w 3 =1.2mm, w 4 =0.49mm, s 1 =0.2mm, s 2 =0.93mm, s 3 =0.2mm, s 4 =1.3mm, s 5 =0.1mm, a=45 .。Fig. 3 and Fig. 4 are the simulation curves of S parameter; Fig. 5 is the change curve of coupling coefficient with two resonator element spacings, can coupling coefficient as required determines the spacing of two resonator elements; Fig. 6 has provided incoming feeder and output feeder loads the excitation line structure and, without the frequency response correlation curve that encourages line structure, with this, manifest the coupling between excitation line structure enhancing incoming feeder and output feeder; The frequency response correlation curve that Fig. 7 is the metal ground plate defect electric coupling structure in ground and metal micro-strip line electric coupling structure, can see that the electric coupling structure in defect ground on metal ground plate can make filter produce transmission zero, improve the Out-of-band rejection ability of filter, improve the pass-band performance of filter; Fig. 8 has provided the operating frequency curve of filter.
Embodiment 2: 9-16 is described in detail embodiment 2 of the present utility model by reference to the accompanying drawings.As shown in Figure 9 and Figure 10, this filter comprises: the metal micro-strip line of front portion, the metal ground plate of reverse side part, the dielectric-slab between metal micro-strip line and metal ground plate.Step electric impedance resonator unit 2, defect ground is the etch structures on filter reverse side metal ground plate, to be constituted by two measure-alike step electric impedance resonator unit 2, isosceles right triangle defect ground, two resonator elements are positioned on a horizontal line, open loop place of two resonator elements is located at respectively on an acute angle, and open loop place is upwards placed; Described incoming feeder 4 and output feeder 5 are positioned at the filter front, and incoming feeder 4 and output feeder 5 used excitation line structures 3 to strengthen coupling effects, being shaped as of excitation line structure 3 " ┓ " or " ┏ ", and whole filter becomes zhou duicheng tuxing.
Embodiment 2 relative dielectric constants
Figure 93467DEST_PATH_IMAGE001
=10.2, thickness hthe dielectric-slab of=1.27mm, through design, emulation and optimization, finally determine the concrete size of this band pass filter as shown in Figure 9 and Figure 10, l 1 =20mm, l 2 =6mm, l 3 =0.7mm, l 3 =8.49mm, l 4 =7.07mm, l 5 =10.32mm, l 6 =9.62mm, l 7 =7.3mm, w 1 =0.2mm, w 2 =0.2mm, w 3 =1.2mm, s 1 =0.2mm, s 2 =0.85mm, s 3 =0.27mm, s 4 =0.2mm, s 5 =0.2mm, a=45 .。Figure 11 and Figure 12 are the simulation curves of S parameter; Figure 13 is the change curve of coupling coefficient with two resonator element spacings, can coupling coefficient as required determines the spacing of two resonator elements; Figure 14 has provided incoming feeder and output feeder loads the excitation line structure and, without the frequency response correlation curve that encourages line structure, with this, manifest the coupling between excitation line structure enhancing incoming feeder and output feeder; The frequency response correlation curve that Figure 15 is metal ground plate defect ground hybrid coupled structure and metal micro-strip line hybrid coupled structure, can see that metal ground plate defect ground hybrid coupled structure can make filter produce transmission zero, improve the Out-of-band rejection ability of filter, improve the pass-band performance of filter; Figure 16 has provided the operating frequency curve of filter.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvement and distortion, these improvement and distortion also should be considered as protection range of the present utility model.

Claims (8)

1. the microstrip bandpass filter based on defect ground step electric impedance resonator, comprise the metal micro-strip line of front portion, the metal ground plate of reverse side part and the dielectric-slab between metal micro-strip line and metal ground plate, described metal micro-strip line is included in incoming feeder and an output feeder on horizontal line, it is characterized in that: on described metal ground plate, etching has resonator element, and described resonator element is positioned at a defect ground step electric impedance resonator on horizontal line by two and constitutes; The inside of described incoming feeder and output feeder is respectively equipped with the excitation line structure that is shaped as " ┓ " or " ┏ ".
2. the microstrip bandpass filter based on defect ground step electric impedance resonator according to claim 1, it is characterized in that: the right-angle side place of described two resonators is provided with respectively open loop, and described open loop place is staggered relatively, and whole filter becomes zhou duicheng tuxing.
3. the microstrip bandpass filter based on defect ground step electric impedance resonator according to claim 1, it is characterized in that: the acute angle place of described two resonators is provided with respectively open loop, and described open loop place is upwards placed, and whole filter becomes zhou duicheng tuxing.
4. the microstrip bandpass filter based on defect ground step electric impedance resonator according to claim 1, it is characterized in that: described resonator is the isosceles right triangle shape.
5. the microstrip bandpass filter based on defect ground step electric impedance resonator according to claim 1, it is characterized in that: it is 0.2mm that " ┓ " of described incoming feeder and output feeder inside and " ┏ " type encourage the width of line structure, and left-right symmetric.
6. the microstrip bandpass filter based on defect ground step electric impedance resonator according to claim 1, it is characterized in that: the gap width between described incoming feeder and output feeder is between 0.1mm to 0.3mm.
7. according to arbitrary described microstrip bandpass filter based on defect ground step electric impedance resonator in claim 1-6, it is characterized in that: described metal micro-strip line and metal ground plate have identical geometric center.
8. the microstrip bandpass filter based on defect ground step electric impedance resonator according to claim 7, it is characterized in that: the material of described metal micro-strip line and metal ground plate is gold, silver or copper.
CN 201220743760 2012-12-29 2012-12-29 Microstrip bandpass filter based on defected-ground stepped impedance resonator Expired - Fee Related CN203039050U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108736115A (en) * 2017-04-21 2018-11-02 南宁富桂精密工业有限公司 Filter
CN109638398A (en) * 2018-12-21 2019-04-16 南京邮电大学 With Wide stop bands and highly selective compact bandpass filter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108736115A (en) * 2017-04-21 2018-11-02 南宁富桂精密工业有限公司 Filter
CN108736115B (en) * 2017-04-21 2020-06-05 南宁富桂精密工业有限公司 Filter with a filter element having a plurality of filter elements
CN109638398A (en) * 2018-12-21 2019-04-16 南京邮电大学 With Wide stop bands and highly selective compact bandpass filter

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