CN105789756A - Dual-rectangular fractal multi-mode resonator based microstrip wide-band filter - Google Patents
Dual-rectangular fractal multi-mode resonator based microstrip wide-band filter Download PDFInfo
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- CN105789756A CN105789756A CN201410809305.7A CN201410809305A CN105789756A CN 105789756 A CN105789756 A CN 105789756A CN 201410809305 A CN201410809305 A CN 201410809305A CN 105789756 A CN105789756 A CN 105789756A
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Abstract
The invention discloses a dual-rectangular fractal multi-mode resonator based microstrip wide-band filter. The filter comprises a metal microstrip patch (30) and a metal grounding plate (50) formed on the upper and lower surface of a dielectric plate (40), wherein the metal microstrip patch comprises the dual-rectangular fractal multi-mode resonator (10) and two stop-band parts (20, 21); the dual-rectangular fractal multi-mode resonator (10) comprises two rectangular fractal parts (11, 12) with different sizes, namely, a stepped impedance full-wavelength annular resonator (11) and a stepped impedance half-wavelength resonator (12); and the two stop-band parts adopt unsymmetrical <pi>-shaped structures to be applied to input and output parts. The microstrip wide-band filter provided by the invention has the characteristics of compact structure, wide upper stop band, low insertion loss in a pass band, and the like.
Description
Technical field
The present invention relates to a kind of microstrip broadband bandpass filter based on double square point shape multimode resonator, the broadband band-pass filter compact conformation, size are small, there is less insertion loss, while there is wider upper stopband, with good broadband character and higher frequency selectivity in passband.
Background technology
In recent years, as ultra wide band (UWB) technology is in the continuous application of wireless communication technology and wireless multimedia service, also developing rapidly for broadband filter technology is accelerated, diversified multimode resonator structure is widely used in the design of broadband filter, to improve the broadband character of wave filter.Although being also more satisfied with from the point of view of existing broadband filter actual performance, still have several drawbacks that part is needed to be improved.
The existing broadband filter based on multimode resonator, such as based on bimodulus, the synthesis of three mode step shape electric impedance resonators or two kinds of resonators and the broadband band-pass filter designed, relative bandwidth can reach more than 50%, but hardly result in relatively low insertion loss.Certain improvement had been carried out for above-mentioned broadband filter later, toroidal cavity resonator is introduced, relatively low logical in-band insertion loss is obtained, but accordingly still there is very big deficiency in the performance such as upper resistance band and frequency selection.Therefore a kind of Wide stop bands, high-frequency selectivity and the broadband band-pass filter with low insertion loss is designed to have great importance.
The content of the invention
In order to improve the performance such as upper resistance band, insertion loss in existing broadband filter, the invention provides a kind of microstrip broadband wave filter based on double square point shape multimode resonator, wherein it is used for improving performance in passband using new double square point shape multimode resonator (10), two band resistance parts point (20,21) are constituted using the π types structure of asymmetry to be used for widening stopband.
The technical solution adopted in the present invention is：
A kind of microstrip broadband wave filter based on double square point shape multimode resonator, it is characterized in that, metal micro-strip paster (30) and metal ground plate (50) including being formed at dielectric-slab (40) upper and lower surface, the metal micro-strip paster is divided to shape multimode resonator (10), two band resistance parts point (20,21) including double square.
Described a kind of microstrip broadband wave filter based on double square point shape multimode resonator, it is characterised in that double square is divided to shape multimode resonator (10) and two band resistance parts point (20,21) to be intercoupled with Coupled Miccrostrip Lines.
A kind of described microstrip broadband wave filter based on double square point shape multimode resonator, it is characterized in that, double square point shape multimode resonator (10) is by scalariform impedance all-wave length toroidal cavity resonator (11) and scalariform impedance half-wave resonator (12), i.e. two Rectangle Fractals (11,12) of different sizes are constituted.
A kind of described microstrip broadband wave filter based on double square point shape multimode resonator, it is characterized in that, two band resistance parts point (20,21) input/output section is applied to using asymmetric π types structure, purpose is to widen stopband, and it is by the unequal microstrip line counterfoil (L of two segment length that the π types band resistance part of asymmetric, which is divided to,1, L2) constitute.
The present invention has the following advantages and characteristic relative to prior art：
(1) compact conformation, size are small, it is easy to process, and make cheap.
(2) 3dB relative bandwidths can reach more than 50%, and with wider upper stopband.
(3) there is precipitous walled belt and very high frequency selectivity.
(4) lead to in-band insertion loss very low, can reach below 1dB.
Brief description of the drawings
The basic structure top view of broadband filters of the Fig. 1 based on double square point shape multimode resonator；
Embodiment
In recent years; multimode ring type resonant device starts to be applied in the design of microstrip bandpass filter; this type filter makes full use of the characteristic that multiple modes of resonance are presented in passband; realize that multimode ring resonator has preferable broadband performance and its compact conformation; it is easy to process; applied widely, the present invention exactly utilizes the multi-resonant characteristic of resonance structure, devises a kind of inexpensive, high performance microstrip broadband bandpass filter.
The concrete structure of the present invention is further described below in conjunction with the accompanying drawings.
As shown in figure 1, the present invention is divided to shape multimode resonator (10), two band resistance part point (20,21) compositions by double square.Double square is divided to shape multimode resonator and two band resistance parts point to be intercoupled by Coupled Miccrostrip Lines.
As shown in figure 1, the size of wave filter double square point shape multimode resonator (10) part is：
The outside long W of Rectangle Fractal (11)1=5mm, wide L9=5mm, the outer rectangular dimension W of Rectangle Fractal (12)2=7.5mm, L11=6.3mm, next each summit of fraction shape quadrangle is respectively the midpoint on each side of upper level quadrangle.Other parts size is：L4=0.60mm, L5=16.90mm, L8=23.15mm, L10=0.91mm, s=0.37mm.
As shown in figure 1, the size of two band resistance parts point of the wave filter (20,21) part is：
The length of two microstrip line counterfoils：L1=7.99mm, L2=6.03mm.The size of the other structures of asymmetric π types structure is：L6=4.75mm, L7=0.74mm, L3=18.47mm.
The selection of medium substrate (40)：The size for the medium substrate that the present invention is used is 2cm*6cm, and its relative dielectric constant is 11.2, and the substrate price is relatively low, and loss is smaller, has a wide range of application.In practice, the medium substrate of other dielectric constant loss angles can be used according to practical application, the dielectric constant loss angle for the medium substrate that the present invention is used is 0.009, and its thickness is 1.6mm, the intensity needed for meeting.
The design of double square point shape multimode resonator (10)：In recent years; multimode ring type resonant device starts to be widely applied in the design of microstrip broadband bandpass filter; such wave filter takes full advantage of the characteristic that multiple modes of resonance are presented in passband; realize that multimode toroidal cavity resonator has preferable broadband performance and its compact conformation, it is easy to process.The double square point shape multimode resonator that the present invention is designed is combination and improvement based on scalariform impedance all-wave length toroidal cavity resonator (SORR) and scalariform impedance half-wave resonator (SHR), mainly it is made up of two huge rings (11,12) of different sizes.It is its compact conformation, easy to process, and good band-pass behavior can be produced.The double square point shape multimode resonator that the present invention is designed produces four transmission poles in passband, two transmission zeros are produced at upper and lower cut-off frequency, the passband relative bandwidth that it is produced realizes precipitous walled belt and high-frequency selectivity up to more than 55%.
The design of two band resistance parts point (20,21)：The present invention constitutes band resistance part point using the π types structure of asymmetric, and stopband can be widened by being applied to input/output section.It is by the unequal micro-strip counterfoil (L of two segment length that the π types band resistance part of wherein asymmetric, which is divided to,1, L2) constitute, the structure can produce two transmission zeros by stopband portion on high frequency, so as to reach the effect for suppressing harmonic effect, widening stopband.Two of the broadband band-pass filter are common driving source (50 Ω) with resistance part point connection.
In order to reduce the volume of wave filter, microstrip line is folded up.This design not only make it that the structure of wave filter is more compact, and communication can be more realized well.The wave filter of this practical design can not only realize more than 55% relative bandwidth, and with higher frequency selectivity and good stopband characteristic, while logical in-band insertion loss is relatively low, simple in construction, small volume, is printed on the two sides of medium substrate, is easy to batch production, debugging, and it is with low cost.
Claims (4)
1. a kind of microstrip broadband wave filter based on double square point shape multimode resonator, it is characterized in that, metal micro-strip paster (30) and metal ground plate (50) including being formed at dielectric-slab (40) upper and lower surface, the metal micro-strip paster is divided to shape multimode resonator (10), two band resistance parts point (20,21) including double square.
2. described in a kind of microstrip broadband wave filter based on double square point shape multimode resonator, it is characterised in that double square be divided to shape multimode resonator (10) and two are divided (20,21) to be intercoupled with Coupled Miccrostrip Lines with resistance parts.
3. described in a kind of microstrip broadband wave filter based on double square point shape multimode resonator, it is characterized in that, double square point shape multimode resonator (10) is by scalariform impedance all-wave length toroidal cavity resonator (11) and scalariform impedance half-wave resonator (12), i.e. two Rectangle Fractals (11,12) of different sizes are constituted.
4. described in a kind of microstrip broadband wave filter based on double square point shape multimode resonator, it is characterized in that, two band resistance parts point (20,21) input/output section is applied to using asymmetric π types structure, purpose is to widen stopband, and it is by the unequal microstrip line counterfoil (L of two segment length that the π types band resistance part of asymmetric, which is divided to,1, L2) constitute.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410809305.7A CN105789756A (en) | 2014-12-22 | 2014-12-22 | Dual-rectangular fractal multi-mode resonator based microstrip wide-band filter |
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| CN201410809305.7A CN105789756A (en) | 2014-12-22 | 2014-12-22 | Dual-rectangular fractal multi-mode resonator based microstrip wide-band filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110957554A (en) * | 2019-12-11 | 2020-04-03 | 重庆邮电大学 | In-line parallel coupling microstrip filter with fractal structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110957554A (en) * | 2019-12-11 | 2020-04-03 | 重庆邮电大学 | In-line parallel coupling microstrip filter with fractal structure |
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Application publication date: 20160720 |
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