CN105789742A - Coplanar waveguide wide-stop-band filter - Google Patents
Coplanar waveguide wide-stop-band filter Download PDFInfo
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- CN105789742A CN105789742A CN201610371666.7A CN201610371666A CN105789742A CN 105789742 A CN105789742 A CN 105789742A CN 201610371666 A CN201610371666 A CN 201610371666A CN 105789742 A CN105789742 A CN 105789742A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/08—Strip line resonators
- H01P7/086—Coplanar waveguide resonators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/08—Strip line resonators
- H01P7/088—Tunable resonators
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Abstract
The invention discloses a coplanar waveguide wide-stop-band filter which is formed by embedding a coplanar waveguide lambda g/4 type SIR short-circuit branch unit structure and a coplanar waveguide defect structure.The structure of the filter is a structure formed by embedding a coplanar waveguide SIR and a coplanar waveguide DGS, a plurality of adjacent resonant zero points can be produced, and therefore the structure is essentially still an SIR structure and has the advantages of the SIR structure, the change of frequency can be achieved by changing the characteristic impedance of a transmission line of the SIR structure, and the structure is quite suitable for designing a small wide-stop-band filter.The contradiction between performance and size of a currently-designed wide-stop-band filter is eliminated, and the filter is small in insertion loss, better in frequency selectivity, small in size and capable of meeting filtering performance and reducing size.
Description
Technical field
The present invention relates to technical field of communication equipment, be specifically related to a kind of co-planar waveguide Wide stop bands wave filter.
Background technology
Co-planar waveguide (CPW) structure realizes microwave filter with coplanar waveguide structure and also arises at the historic moment after being put forward by C.P.Wen in 1969.Co-planar waveguide is the structure that a kind of conductor belt is in together in approximately the same plane with ground level, as shown in Figure 2, this structure includes dielectric substrate, the co-planar waveguide holding wire of the dielectric substrate upper surface middle position that is laid in, and has laid co-planar waveguide ground, co-planar waveguide ground in co-planar waveguide holding wire both sides.This structure is easy to outward element in parallel, it is readily configured hydrid integrated circuit, it is connected the plurality of advantages such as very convenient with active device, passive device owing to it has, and the developing rapidly of Microwave and millimeter wave integrated circuits particularly monolithic integrated optical circuit technology, in the last few years, coplanar waveguide structure receives the concern of more and more scholar, utilizes this structural design microwave filter also to become more extensive.
Along with the development of microwave technology, the design of microwave filter comparative maturity, nowadays people are when the band-pass behavior meeting wave filter requires, more focus on the realization of Wide stop bands.
At present, co-planar waveguide Wide stop bands wave filter generally adopts one of the following two kinds structure:
One, the distressed structure of step impedance resonator (SIR) and SIR is adopted, as shown in Figure 3, this structure includes the coplanar waveguide structure shown in the SIR cellular construction of the λ g/4 type shown in Fig. 1 and Fig. 2, and SIR structure one end is connected with co-planar waveguide ground formation short circuit, and the other end is opened a way；
Two, defect ground structure (DGS), as shown in Figure 4, this structure includes the coplanar waveguide structure of Fig. 2, defines two smaller rectangle defect ground of symmetrical opening on the ground at co-planar waveguide；
Owing to utilize DGS structure or the SIR structure that a lot of designers are single at present carries out cascade, cascade number is about 4,5, general cascade number of times is more many, the Insertion Loss brought can be more big, although therefore obtain good Wide stop bands performance, but also bring the increase of bandpass part Insertion Loss and the shortcoming of the increase of device volume simultaneously.
Summary of the invention
The purpose of the embodiment of the present invention is in that to provide a kind of co-planar waveguide Wide stop bands wave filter, solves that the bandpass part Insertion Loss existed in prior art is big, the bulky problem of wave filter.
For reaching above-mentioned purpose, the embodiment of the invention discloses:
A kind of co-planar waveguide Wide stop bands wave filter, including the SIR short branch cellular construction of co-planar waveguide λ g/4 type, and the defect sturcture of at least one of which co-planar waveguide being nested in the SIR short branch cellular construction of co-planar waveguide λ g/4 type,
The SIR short branch cellular construction of described co-planar waveguide λ g/4 type, including the SIR cellular construction of coplanar waveguide structure and the λ g/4 type that is nested in coplanar waveguide structure,
Described coplanar waveguide structure, including dielectric substrate, it is laid with co-planar waveguide holding wire in dielectric substrate upper surface middle position, is laid with co-planar waveguide ground in co-planar waveguide holding wire both sides, gap is left between described co-planar waveguide holding wire and co-planar waveguide ground
The SIR cellular construction of described λ g/4 type, including the thicker transmission line being connected and a thinner transmission line, the SIR cellular construction of described coplanar waveguide structure and λ g/4 type is when being nested into the SIR short branch cellular construction of co-planar waveguide λ g/4 type, described thinner transmission line one end is connected formation short circuit with described co-planar waveguide ground, described thicker transmission line one end is all not connected to co-planar waveguide ground, co-planar waveguide holding wire, form open circuit
The defect sturcture of described co-planar waveguide, including described coplanar waveguide structure, having the defect ground of rectangle on the ground at described co-planar waveguide, defect ground is towards co-planar waveguide holding wire side, it is connected by the gap between an opening with coplanar waveguide signal line and co-planar waveguide ground
The SIR short branch cellular construction of described co-planar waveguide λ g/4 type and the defect sturcture of co-planar waveguide are when being nested into co-planar waveguide Wide stop bands wave filter, and the defect ground part of the defect sturcture of described co-planar waveguide is nested in transmission line thicker in the SIR short branch cellular construction of co-planar waveguide λ g/4 type.
Preferably, the SIR short branch cellular construction of described co-planar waveguide λ g/4 type is nested with the defect sturcture of one layer of co-planar waveguide, the defect ground part of the defect sturcture of described co-planar waveguide is nested in transmission line thicker in the SIR short branch cellular construction of co-planar waveguide λ g/4 type, and the opening of the defect ground part of the defect sturcture of co-planar waveguide is towards described co-planar waveguide holding wire side.
Preferably, the defect ground part of the defect sturcture of described co-planar waveguide is a straight-flanked ring.
nullPreferably，The SIR short branch cellular construction of described co-planar waveguide λ g/4 type is nested with the defect sturcture of two-layer co-planar waveguide，The defect ground part of the defect sturcture of described ground floor co-planar waveguide is nested in transmission line thicker in the SIR short branch cellular construction of co-planar waveguide λ g/4 type，The opening of the defect ground part of the defect sturcture of ground floor co-planar waveguide is towards co-planar waveguide holding wire side in the SIR short branch cellular construction of described co-planar waveguide λ g/4 type，The defect ground part of the defect sturcture of ground floor co-planar waveguide is a straight-flanked ring，Co-planar waveguide ground not exclusively hollow out in straight-flanked ring，The defect ground part of the defect sturcture of described second layer co-planar waveguide is nested in the co-planar waveguide ground in the defect ground part of the defect sturcture of ground floor co-planar waveguide，The opening of the defect ground part of the defect sturcture of second layer co-planar waveguide is towards co-planar waveguide holding wire side in the SIR short branch cellular construction of described co-planar waveguide λ g/4 type.
nullPreferably，The SIR short branch cellular construction of described co-planar waveguide λ g/4 type is nested with the defect sturcture of two-layer co-planar waveguide，The defect ground part of the defect sturcture of described ground floor co-planar waveguide is nested in transmission line thicker in the SIR short branch cellular construction of co-planar waveguide λ g/4 type，The opening of the defect ground part of the defect sturcture of ground floor co-planar waveguide is towards co-planar waveguide holding wire side in the SIR short branch cellular construction of described co-planar waveguide λ g/4 type，The defect ground part of the defect sturcture of ground floor co-planar waveguide is a straight-flanked ring，Co-planar waveguide ground not exclusively hollow out in straight-flanked ring，The defect ground part of the defect sturcture of described second layer co-planar waveguide is nested in the co-planar waveguide ground in the defect ground part of the defect sturcture of ground floor co-planar waveguide，The side that opening is in the SIR short branch cellular construction of described co-planar waveguide λ g/4 type and co-planar waveguide holding wire is opposing parallel of the defect ground part of the defect sturcture of second layer co-planar waveguide.
nullPreferably，The SIR short branch cellular construction of described co-planar waveguide λ g/4 type is nested with the defect sturcture of two-layer co-planar waveguide，The defect ground part of the defect sturcture of described ground floor co-planar waveguide is nested in transmission line thicker in the SIR short branch cellular construction of co-planar waveguide λ g/4 type，The opening of the defect ground part of the defect sturcture of ground floor co-planar waveguide is towards co-planar waveguide holding wire side in the SIR short branch cellular construction of described co-planar waveguide λ g/4 type，The defect ground part of the defect sturcture of ground floor co-planar waveguide is a straight-flanked ring，Co-planar waveguide ground not exclusively hollow out in straight-flanked ring，The defect ground part of the defect sturcture of described second layer co-planar waveguide is nested in the co-planar waveguide ground in the defect ground part of the defect sturcture of ground floor co-planar waveguide，The side that opening is in the SIR short branch cellular construction of described co-planar waveguide λ g/4 type and co-planar waveguide holding wire is perpendicular of the defect ground part of the defect sturcture of second layer co-planar waveguide.
Preferably, the defect ground part of the defect sturcture of described second layer co-planar waveguide is a straight-flanked ring.
As seen from the above technical solutions, the embodiment of the present invention is by by nested with the defect sturcture of co-planar waveguide for the SIR short branch cellular construction of the co-planar waveguide λ g/4 type co-planar waveguide Wide stop bands wave filter obtaining miniaturization, when solving current design Wide stop bands wave filter, the contradiction existed between performance and volume, owing to the present invention is not over utilizing DGS or SIR structure to carry out simple multi-stage cascade to obtain multiple resonance point, but devise what a kind of nested structure realized, therefore its Insertion Loss is less, and small volume, volume is also reduced while meeting filtering performance.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the SIR cellular construction of λ g/4 type；
Fig. 2 is coplanar waveguide structure schematic diagram；
Fig. 3 is the SIR short branch cellular construction schematic diagram of co-planar waveguide λ g/4 type；
Fig. 4 is the structural representation of the first embodiment of defect sturcture of co-planar waveguide；
Fig. 5 is the structural representation of defect sturcture the second embodiment of co-planar waveguide；
Fig. 6 is the structural representation of the first embodiment of co-planar waveguide Wide stop bands wave filter of the present invention；
Fig. 7 is the structural representation of the second embodiment of co-planar waveguide Wide stop bands wave filter of the present invention；
Fig. 8 is the structural representation of the third embodiment of co-planar waveguide Wide stop bands wave filter of the present invention；
Fig. 9 is the structural representation of the 4th kind of embodiment of co-planar waveguide Wide stop bands wave filter of the present invention；
Figure 10 is the structural representation of the 5th kind of embodiment of co-planar waveguide Wide stop bands wave filter of the present invention；
Figure 11 is the structural representation of the 6th kind of embodiment of co-planar waveguide Wide stop bands wave filter of the present invention；
Figure 12 is the structural representation of the 7th kind of embodiment of co-planar waveguide Wide stop bands wave filter of the present invention；
Figure 13 is the structural representation of the 8th kind of embodiment of co-planar waveguide Wide stop bands wave filter of the present invention；
Figure 14 is the structural representation of the 9th kind of embodiment of co-planar waveguide Wide stop bands wave filter of the present invention；
Figure 15 is the structural representation of the tenth kind of embodiment of co-planar waveguide Wide stop bands wave filter of the present invention；
Figure 16 is the S21 parameter schematic diagram of co-planar waveguide SIR structure；
Figure 17 is the S21 parameter schematic diagram of co-planar waveguide defect ground structure；
Figure 18 is the S21 parameter schematic diagram of co-planar waveguide SIR and defect ground nested structure.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Fig. 1 is the SIR cellular construction of λ g/4 type, and this structure includes a thicker transmission line being connected and a thinner transmission line, and thick transmission line is different with the characteristic impedance of thin transmission line, by changing the impedance ratio R between themZCan adjusting resonator length and corresponding stray resonance frequency, it is the resonator of a kind of double resonance point that can produce transverse electric and magnetic field or quasi-transverse-electromagnetic field mode.
Fig. 2 is coplanar waveguide structure, including dielectric substrate, is laid with co-planar waveguide holding wire in dielectric substrate upper surface middle position, is laid with co-planar waveguide ground in co-planar waveguide holding wire both sides, leaves gap between co-planar waveguide holding wire and co-planar waveguide ground.
Fig. 3 is the SIR short branch cellular construction of co-planar waveguide λ g/4 type, this structure includes the SIR cellular construction of coplanar waveguide structure and the λ g/4 type that is nested in coplanar waveguide structure, transmission line one end thinner in the SIR cellular construction of λ g/4 type is connected formation short circuit with the co-planar waveguide ground of coplanar waveguide structure, thicker transmission line one end is all not connected to co-planar waveguide ground and co-planar waveguide holding wire, forms open circuit.
Fig. 4 is the first embodiment of the defect ground structure of co-planar waveguide, this structure includes the coplanar waveguide structure of Fig. 2 equally, the defect ground of rectangle is had on the ground at co-planar waveguide, defect ground, towards co-planar waveguide holding wire side, is connected by the gap between an opening with coplanar waveguide signal line and co-planar waveguide ground.
Fig. 5 is the second embodiment of the defect ground structure of co-planar waveguide, with Fig. 4 the difference is that, defect ground part is a straight-flanked ring, sheet metal co-planar waveguide ground not exclusively hollow out in straight-flanked ring, effect is so that wave filter has bigger equivalent capacity and less equivalent inductance in higher frequency, contributes to increasing the Insertion Loss of wave filter at high band and reducing the return loss of wave filter.
Fig. 6 is the structure of co-planar waveguide Wide stop bands the first embodiment of wave filter of the present invention, this structure is, on the basis of Fig. 3, Fig. 4 structure is carried out nesting, the SIR short branch cellular construction of co-planar waveguide λ g/4 type is nested with the defect sturcture of one layer of co-planar waveguide, the defect ground part of the defect sturcture of co-planar waveguide is nested in transmission line thicker in the SIR short branch cellular construction of co-planar waveguide λ g/4 type, the opening of the defect ground part of the defect sturcture of co-planar waveguide is towards co-planar waveguide holding wire side in the SIR short branch cellular construction of the defect sturcture co-planar waveguide λ g/4 type of co-planar waveguide.
According to the structure of the first embodiment, arranging a layer defects ground, the feature of the wave filter of this kind of structure is, the second harmonic distance first harmonic of the DGS structure generation being nested in SIR structure is farther, and therefore second harmonic can be less to filter stop bend performance impact.
The structure of the second embodiment of the present invention, as shown in Figure 7, also it is the defect sturcture being nested with one layer of co-planar waveguide in the SIR short branch cellular construction of co-planar waveguide λ g/4 type, it comprises all structures in the first embodiment, repeat no more herein, in addition, the defect ground part of the defect sturcture of co-planar waveguide is a straight-flanked ring, the sheet metal co-planar waveguide ground not exclusively hollow out in straight-flanked ring.
Structure according to the second embodiment, one layer defects ground is set, defect ground part is a straight-flanked ring, sheet metal co-planar waveguide ground not exclusively hollow out in straight-flanked ring, the wave filter of this kind of structure has bigger equivalent capacity and less equivalent inductance in higher frequency, contributes to increasing the Insertion Loss of wave filter at high band and reducing the return loss of wave filter.
nullThe structure of the third embodiment of the present invention，As shown in Figure 8，The SIR short branch cellular construction of co-planar waveguide λ g/4 type is nested with the defect sturcture of two-layer co-planar waveguide，The defect ground part of the defect sturcture of ground floor co-planar waveguide is nested in transmission line thicker in the SIR short branch cellular construction of co-planar waveguide λ g/4 type，The opening of the defect ground part of the defect sturcture of ground floor co-planar waveguide is towards co-planar waveguide holding wire side in the SIR short branch cellular construction of co-planar waveguide λ g/4 type，The defect ground part of the defect sturcture of ground floor co-planar waveguide is a straight-flanked ring，Sheet metal co-planar waveguide ground not exclusively hollow out in straight-flanked ring，The defect ground part of the defect sturcture of second layer co-planar waveguide is nested in the co-planar waveguide ground in the defect ground part of the defect sturcture of ground floor co-planar waveguide，The opening of the defect ground part of the defect sturcture of second layer co-planar waveguide is towards co-planar waveguide holding wire side in the SIR short branch cellular construction of co-planar waveguide λ g/4 type.
According to the structure of the third embodiment, arranging two layer defects ground, two layer defects ground openings are identical, and the feature of the wave filter of this kind of structure is, compared to arranging a layer defects ground, the resonance point of generation is more, then corresponding bandwidth of rejection is wider.
The structure of the 4th kind of embodiment of the present invention, as shown in Figure 9, also it is the defect sturcture being nested with two-layer co-planar waveguide in the SIR short branch cellular construction of co-planar waveguide λ g/4 type, it comprises all structures in the third embodiment, repeat no more herein, in addition, the defect ground part of the defect sturcture of the co-planar waveguide of the defect sturcture of second layer co-planar waveguide is a straight-flanked ring, the sheet metal co-planar waveguide ground not exclusively hollow out in straight-flanked ring.
Structure according to the 4th kind of embodiment, two layer defects ground are set, two layer defects ground openings are identical, and second layer defect ground is a straight-flanked ring, sheet metal co-planar waveguide ground not exclusively hollow out in straight-flanked ring, the wave filter of this kind of structure, compared to the third embodiment, has bigger equivalent capacity and less equivalent inductance in higher frequency, contributes to increasing the Insertion Loss of wave filter at high band and reducing the return loss of wave filter.
nullThe structure of the 5th kind of embodiment of the present invention，As shown in Figure 10，The SIR short branch cellular construction of co-planar waveguide λ g/4 type is nested with the defect sturcture of two-layer co-planar waveguide，The defect ground part of the defect sturcture of ground floor co-planar waveguide is nested in transmission line thicker in the SIR short branch cellular construction of co-planar waveguide λ g/4 type，The opening of the defect ground part of the defect sturcture of ground floor co-planar waveguide is towards co-planar waveguide holding wire side in the SIR short branch cellular construction of co-planar waveguide λ g/4 type，The defect ground part of the defect sturcture of ground floor co-planar waveguide is a straight-flanked ring，Sheet metal co-planar waveguide ground not exclusively hollow out in straight-flanked ring，The defect ground part of the defect sturcture of second layer co-planar waveguide is nested in the sheet metal co-planar waveguide ground in the defect ground part of the defect sturcture of ground floor co-planar waveguide，The side that opening is in the SIR short branch cellular construction of co-planar waveguide λ g/4 type and co-planar waveguide holding wire is opposing parallel of the defect ground part of the defect sturcture of second layer co-planar waveguide.
Structure according to the 5th kind of embodiment, sheet metal co-planar waveguide ground in defect ground introduces again a little defect, but opening is contrary with the opening on big defect ground, compared to the third embodiment, when two layer defects ground opening directions are identical, be equivalent to parallel relationship, during two layer defects ground opening direction differences, be equivalent to series relationship.Defect ground in parallel can introduce more resonance point so that wave filter has bigger stopband range；The defect ground of series connection has longer electrical length, thus changing resonant frequency point f4Value so that f4There is broader alterable scope.
The structure of the 6th kind of embodiment of the present invention, as shown in figure 11, also it is the defect sturcture being nested with two-layer co-planar waveguide in the SIR short branch cellular construction of co-planar waveguide λ g/4 type, two layer defects ground openings are contrary, its all structures comprised in the 5th kind of embodiment, repeat no more, in addition herein, second layer defect ground part is a straight-flanked ring, the sheet metal co-planar waveguide ground not exclusively hollow out in straight-flanked ring.
Compared to the 5th kind of embodiment, the wave filter of the 6th kind of example structure has bigger equivalent capacity and less equivalent inductance in higher frequency, contributes to increasing the Insertion Loss of wave filter at high band and reducing the return loss of wave filter.
nullThe present invention the 7th kind、The structure of the 8th kind of embodiment，Respectively such as Figure 12、Shown in Figure 13，The SIR short branch cellular construction of co-planar waveguide λ g/4 type is nested with the defect sturcture of two-layer co-planar waveguide，The defect ground part of the defect sturcture of ground floor co-planar waveguide is nested in transmission line thicker in the SIR short branch cellular construction of co-planar waveguide λ g/4 type，The opening of the defect ground part of the defect sturcture of ground floor co-planar waveguide is towards co-planar waveguide holding wire side in the SIR short branch cellular construction of co-planar waveguide λ g/4 type，The defect ground part of the defect sturcture of ground floor co-planar waveguide is a straight-flanked ring，Sheet metal co-planar waveguide ground not exclusively hollow out in straight-flanked ring，The defect ground part of the defect sturcture of second layer co-planar waveguide is nested in the sheet metal co-planar waveguide ground in the defect ground part of the defect sturcture of ground floor co-planar waveguide，The side that opening is in the SIR short branch cellular construction of co-planar waveguide λ g/4 type and co-planar waveguide holding wire is perpendicular of the defect ground part of the defect sturcture of second layer co-planar waveguide.
According to the structure of the 7th kind, the 8th kind embodiment, performance of filter is with reference to the performance of the 5th kind of embodiment wave filter.
The structure of the 9th kind, the tenth kind embodiment of the present invention, such as Figure 14, shown in 15, also it is the defect sturcture being nested with two-layer co-planar waveguide in the SIR short branch cellular construction of co-planar waveguide λ g/4 type, the side that opening is in the SIR short branch cellular construction of co-planar waveguide λ g/4 type and co-planar waveguide holding wire is perpendicular of the defect ground part of the defect sturcture of second layer co-planar waveguide.It comprises the 7th, all structures in eight kind of embodiment, repeats no more herein, and in addition, the defect ground part of the defect sturcture of second layer co-planar waveguide is a straight-flanked ring, the sheet metal co-planar waveguide ground not exclusively hollow out in straight-flanked ring.
According to the structure of the 9th kind, the tenth kind embodiment, performance of filter is with reference to the performance of the 6th kind of embodiment wave filter.
The number of plies should be noted that the number of plies of the defect sturcture of the SIR short branch cellular construction of co-planar waveguide λ g/4 type and co-planar waveguide nesting is altogether preferably no more than 3 layers, because can cause the loss that passband is relatively larger too much.
It will be understood by those skilled in the art that, DGS-SIR structure is when carrying out nested designs, it is also contemplated that the frequency relation of the resonance zero point of the resonance zero point of co-planar waveguide SIR structure and co-planar waveguide DGS, such as Figure 16, such as Figure 17 and as shown in figure 18, the resonance zero point f on co-planar waveguide defect ground4The resonance zero point f that co-planar waveguide SIR structure is higher should be in2With following cut-off frequency f3Between, thus forming the wave filter of a continuous print multi-resonant zero point.The relatively low resonance zero point f of co-planar waveguide SIR structure1It is limited mainly by the impact of the width f of thinner transmission line, the increase of width f, relatively low resonance zero point f1Can increase, and resonance zero point f2Maintenance is basically unchanged；Higher resonance zero point f2It is limited mainly by the impact of the length c of thick transmission line, the increase of length c, higher resonance zero point f2Can reduce, now following cut-off frequency f3Also reduce therewith, the scope of its reduction and f2Reduction scope identical, be equivalent to f2And f3Two Frequency point joint translation Δ f, and resonance zero point f1Maintenance is basically unchanged.The resonance zero point f on co-planar waveguide defect ground4The girth being limited mainly by defect ground is relevant, and girth increases, resonance zero point f4Can reduce, therefore in the process adjusting frequency, it is possible to first keep two of which resonance zero point constant, adjust another resonance zero point, finally make the frequency relation of three resonance zero points reach f3>f4>f2。
It should be noted that, in this article, the relational terms of such as first and second or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include the process of a series of key element, method, article or equipment not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method, article or equipment.When there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method, article or equipment.
Each embodiment in this specification all adopts relevant mode to describe, between each embodiment identical similar part mutually referring to, what each embodiment stressed is the difference with other embodiments.Especially for system embodiment, owing to it is substantially similar to embodiment of the method, so what describe is fairly simple, relevant part illustrates referring to the part of embodiment of the method.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.All make within the spirit and principles in the present invention any amendment, equivalent replacement, improvement etc., be all contained in protection scope of the present invention.
Claims (7)
1. a co-planar waveguide Wide stop bands wave filter, it is characterised in that include the SIR short branch cellular construction of co-planar waveguide λ g/4 type and the defect sturcture of at least one of which co-planar waveguide being nested in the SIR short branch cellular construction of co-planar waveguide λ g/4 type,
The SIR short branch cellular construction of described co-planar waveguide λ g/4 type, including the SIR cellular construction of coplanar waveguide structure and the λ g/4 type that is nested in coplanar waveguide structure,
Described coplanar waveguide structure, including dielectric substrate, it is laid with co-planar waveguide holding wire in dielectric substrate upper surface middle position, is laid with co-planar waveguide ground in co-planar waveguide holding wire both sides, gap is left between described co-planar waveguide holding wire and co-planar waveguide ground
The SIR cellular construction of described λ g/4 type, including the thicker transmission line being connected and a thinner transmission line, the SIR cellular construction of described coplanar waveguide structure and λ g/4 type is when being nested into the SIR short branch cellular construction of co-planar waveguide λ g/4 type, described thinner transmission line one end is connected formation short circuit with described co-planar waveguide ground, described thicker transmission line one end is all not connected to co-planar waveguide ground, co-planar waveguide holding wire, form open circuit
The defect sturcture of described co-planar waveguide, including described coplanar waveguide structure, having the defect ground of rectangle on the ground at described co-planar waveguide, defect ground is towards co-planar waveguide holding wire side, it is connected by the gap between an opening with coplanar waveguide signal line and co-planar waveguide ground
The SIR short branch cellular construction of described co-planar waveguide λ g/4 type and the defect sturcture of co-planar waveguide are when being nested into co-planar waveguide Wide stop bands wave filter, and the defect ground part of the defect sturcture of described co-planar waveguide is nested in transmission line thicker in the SIR short branch cellular construction of co-planar waveguide λ g/4 type.
2. co-planar waveguide Wide stop bands wave filter according to claim 1, it is characterized in that, the SIR short branch cellular construction of described co-planar waveguide λ g/4 type is nested with the defect sturcture of one layer of co-planar waveguide, the defect ground part of the defect sturcture of described co-planar waveguide is nested in transmission line thicker in the SIR short branch cellular construction of co-planar waveguide λ g/4 type, and the opening of the defect ground part of the defect sturcture of co-planar waveguide is towards described co-planar waveguide holding wire side.
3. co-planar waveguide Wide stop bands wave filter according to claim 2, it is characterised in that the defect ground part of the defect sturcture of described co-planar waveguide is a straight-flanked ring.
null4. co-planar waveguide Wide stop bands wave filter according to claim 1，It is characterized in that，The SIR short branch cellular construction of described co-planar waveguide λ g/4 type is nested with the defect sturcture of two-layer co-planar waveguide，The defect ground part of the defect sturcture of described ground floor co-planar waveguide is nested in transmission line thicker in the SIR short branch cellular construction of co-planar waveguide λ g/4 type，The opening of the defect ground part of the defect sturcture of ground floor co-planar waveguide is towards co-planar waveguide holding wire side in the SIR short branch cellular construction of described co-planar waveguide λ g/4 type，The defect ground part of the defect sturcture of ground floor co-planar waveguide is a straight-flanked ring，Co-planar waveguide ground not exclusively hollow out in straight-flanked ring，The defect ground part of the defect sturcture of described second layer co-planar waveguide is nested in the co-planar waveguide ground in the defect ground part of the defect sturcture of ground floor co-planar waveguide，The opening of the defect ground part of the defect sturcture of second layer co-planar waveguide is towards co-planar waveguide holding wire side in the SIR short branch cellular construction of described co-planar waveguide λ g/4 type.
null5. co-planar waveguide Wide stop bands wave filter according to claim 1，It is characterized in that，The SIR short branch cellular construction of described co-planar waveguide λ g/4 type is nested with the defect sturcture of two-layer co-planar waveguide，The defect ground part of the defect sturcture of described ground floor co-planar waveguide is nested in transmission line thicker in the SIR short branch cellular construction of co-planar waveguide λ g/4 type，The opening of the defect ground part of the defect sturcture of ground floor co-planar waveguide is towards co-planar waveguide holding wire side in the SIR short branch cellular construction of described co-planar waveguide λ g/4 type，The defect ground part of the defect sturcture of ground floor co-planar waveguide is a straight-flanked ring，Co-planar waveguide ground not exclusively hollow out in straight-flanked ring，The defect ground part of the defect sturcture of described second layer co-planar waveguide is nested in the co-planar waveguide ground in the defect ground part of the defect sturcture of ground floor co-planar waveguide，The side that opening is in the SIR short branch cellular construction of described co-planar waveguide λ g/4 type and co-planar waveguide holding wire is opposing parallel of the defect ground part of the defect sturcture of second layer co-planar waveguide.
null6. co-planar waveguide Wide stop bands wave filter according to claim 1，It is characterized in that，The SIR short branch cellular construction of described co-planar waveguide λ g/4 type is nested with the defect sturcture of two-layer co-planar waveguide，The defect ground part of the defect sturcture of described ground floor co-planar waveguide is nested in transmission line thicker in the SIR short branch cellular construction of co-planar waveguide λ g/4 type，The opening of the defect ground part of the defect sturcture of ground floor co-planar waveguide is towards co-planar waveguide holding wire side in the SIR short branch cellular construction of described co-planar waveguide λ g/4 type，The defect ground part of the defect sturcture of ground floor co-planar waveguide is a straight-flanked ring，Co-planar waveguide ground not exclusively hollow out in straight-flanked ring，The defect ground part of the defect sturcture of described second layer co-planar waveguide is nested in the co-planar waveguide ground in the defect ground part of the defect sturcture of ground floor co-planar waveguide，The side that opening is in the SIR short branch cellular construction of described co-planar waveguide λ g/4 type and co-planar waveguide holding wire is perpendicular of the defect ground part of the defect sturcture of second layer co-planar waveguide.
7. the co-planar waveguide Wide stop bands wave filter according to claim 4-6 any one, it is characterised in that the defect ground part of the defect sturcture of described second layer co-planar waveguide is a straight-flanked ring.
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| CN113285188A (en) * | 2021-05-27 | 2021-08-20 | 重庆邮电大学 | Coplanar waveguide band-pass filter with reconfigurable pass band |
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