CN101834326B - Double-passband filter with left-hand performance - Google Patents
Double-passband filter with left-hand performance Download PDFInfo
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- CN101834326B CN101834326B CN 201010156154 CN201010156154A CN101834326B CN 101834326 B CN101834326 B CN 101834326B CN 201010156154 CN201010156154 CN 201010156154 CN 201010156154 A CN201010156154 A CN 201010156154A CN 101834326 B CN101834326 B CN 101834326B
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- transmission line
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- passband filter
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Abstract
The invention discloses a double-passband filter with a left-hand performance, comprising a grounding plate, a central transmission line, a hollow-out split resonant ring and split-ring resonators, wherein, the hollow-out split resonant ring is etched on the grounding plate; the grounding plate is equipped with a medium plate; the central transmission line is arranged on the medium plate, two ends thereof are respectively connected with an external signal input cable and an external signal output cable, two sides thereof are symmetrically equipped with two split-ring resonators, and the central position thereof is etched with a slit; and the central transmission line at two sides of the slit is etched with a plurality of through holes on the grounding plate. The double-passband filter helps a signal passing the same have the left-hand performance and small structural physical dimensions.
Description
Technical field
The present invention relates to the double-passband filter in a kind of microwave communication signal transmission technology field, relate in particular to a kind of double-passband filter with left-hand performance.
Background technology
In separation and sorting signals in communication system, filter is vital.Filter is two-port network basically, and it can adjust the frequency response of communication system.In some applications, for example communication satellite and mobile communication equipment, with design of filter get volume little, lightweight be vital.Existing double-passband filter (or microstrip line) overwhelming majority does not have left hand characteristic, and size is larger.
Summary of the invention
The present invention seeks to provides a kind of double-passband filter with left-hand performance for the defective that prior art exists, and makes its signal that passes through have left hand characteristic.Simultaneously, reduce the structure physical size.
The present invention adopts following technical scheme for achieving the above object:
The present invention has the double-passband filter of left-hand performance, comprise ground plate, central transmission line, hollow out split ring resonator and split-ring resonator, wherein the hollow out split ring resonator is etched on ground plate, dielectric-slab is set on ground plate, central authorities' transmission line is arranged on dielectric-slab, central authorities' transmission line two ends connect respectively external signal input cable and output cable, central authorities' transmission line bilateral symmetry arranges two split-ring resonators, the center of central authorities' transmission line etches a gap, etches a plurality of through holes to ground plate on the central transmission line of both sides, described gap.
Preferably, the end width at described central transmission line two ends is less than central transmission line middle part width, and the end resistance of central transmission line and external signal input cable and output cable mate.
Preferably, the dielectric constant of described dielectric-slab is ε=2.65.
The present invention is according to the left hand transmission line principle design, has 0.78GHz to 1.52GHz and 2.78GHz to two passbands of 3.12GHz., only has the electromagnetic wave in this frequency band can pass through this structure.Realize two passbands that can regulate separately, because structure adopts plane lump type inductance capacitance, and had equivalent parallel inductance and series capacitance according to the transmission line principle, so not only the size than traditional double pass filter is little, and had left hand characteristic.And because using planar technique, obviously reduce with same conventional filter comparative structure size.
Description of drawings
Fig. 1: cellular construction equivalent circuit diagram;
Fig. 2: cellular construction schematic diagram;
Fig. 3: SRR structural representation;
Fig. 4: CSRR structural representation;
Fig. 5: three unit sample in measurements and simulation result (S21);
Fig. 6: three unit sample in measurements and simulation result (S11).
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to invention:
as shown in Figure 2, the present invention has the double-passband filter of left-hand performance, comprise ground plate ground, central authorities' transmission line, hollow out split ring resonator CSRR and split-ring resonator SRR, wherein hollow out split ring resonator CSRR is etched on ground plate ground, on ground plate ground, dielectric-slab is set, central authorities' transmission line is arranged on dielectric-slab, central authorities' transmission line two ends connect respectively external signal input cable and output cable, central authorities' transmission line bilateral symmetry arranges two split-ring resonator SRR, the center of central authorities' transmission line etches a gap gap, etch a plurality of through holes to ground plate ground on the central transmission line of gap both sides, described gap.Symmetrically on the central transmission line of these both sides, gap etch 6 grounding through hole.Filling dielectric constant between central transmission line and ground plate is the dielectric-slab of ε=2.65.According to the transmission line principle, the CSRR equivalence becomes the C in circuit diagram 1
CSRR, L
CSRR, and C
Strip, 6 metal grounding through hole equivalences are L
via, two SRR equivalences of upper surface are C
SRR, L
SRR, the gap equivalence on central transmission line is C
gap, central transmission line equivalence is L
Strip
This structure is with a CSRR and two SRR combinations, and the electric capacity of series arm and the inductance of parallel branch are provided.Utilize simultaneously on central transmission line the gap with its on the metal throuth hole that is connected with ground plate the electric capacity of other series arm and the inductance of parallel branch are provided.So just consist of the primary condition (primary condition of left hand transmission line is to have shunt inductance and series capacitance) of two groups of left hand transmission lines.
The concrete size of specific embodiment of the invention cellular construction is as follows:
Dielectric-slab thickness h=0.508mm, DIELECTRIC CONSTANT ε=2.65;
SRR and CSRR size such as Fig. 3 are shown in 4;
a＝4.5mm.b＝25mm.w＝10mm.d＝1.38mm：
Between SRR structure and central transmission line apart from g=0.2mm.
Preferably, the end width at described central transmission line two ends is less than central transmission line middle part width, and the end resistance of central transmission line and external signal input cable and output cable mate.
Preferably, the dielectric constant of described dielectric-slab is ε=2.65.
When as Fig. 5, the electromagnetic wave in frequency range shown in 6 is during by this structure, because of the electric current on microstrip line can cause its around the variation in magnetic field, and this magnetic field is just perpendicular to the SRR anchor ring, the magnetic field concussion can make perpendicular to B and the H of SRR anchor ring reverse like this.Therefore, the magnetic permeability μ of SRR generation is just less than zero.In identical frequency range, the electric field between central transmission line and ground plate when concussion occurs this electric field, makes the DIELECTRIC CONSTANT ε of CSRR generation less than zero perpendicular to the CSRR anchor ring.Simultaneously less than zero the time, this material has left hand characteristic when the magnetic permeability of something and dielectric constant.
Claims (3)
1. double-passband filter with left-hand performance, it is characterized in that comprising ground plate (ground), central authorities' transmission line, hollow out split ring resonator (CSRR) and split-ring resonator (SRR), wherein hollow out split ring resonator (CSRR) is etched on ground plate (ground), on ground plate (ground), dielectric-slab is set, central authorities' transmission line is arranged on dielectric-slab, central authorities' transmission line two ends connect respectively external signal input cable and output cable, central authorities' transmission line bilateral symmetry arranges two split-ring resonators (SRR), the center of central authorities' transmission line etches a gap (gap), on the central transmission line of both sides, described gap (gap), symmetry etches 6 through holes to ground plate (ground).
2. the double-passband filter with left-hand performance according to claim 1, the end width that it is characterized in that described central transmission line two ends is less than central transmission line middle part width, and the end resistance of central transmission line and external signal input cable and output cable mate.
3. the double-passband filter with left-hand performance according to claim 1, the dielectric constant that it is characterized in that described dielectric-slab is ε=2.65.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010156154 CN101834326B (en) | 2010-04-23 | 2010-04-23 | Double-passband filter with left-hand performance |
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| CN 201010156154 CN101834326B (en) | 2010-04-23 | 2010-04-23 | Double-passband filter with left-hand performance |
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| CN101834326A CN101834326A (en) | 2010-09-15 |
| CN101834326B true CN101834326B (en) | 2013-05-08 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299394B (en) * | 2011-04-21 | 2013-12-18 | 哈尔滨工业大学 | Supernormal medium ultrahigh frequency band pass filter |
| CN102255120B (en) * | 2011-04-26 | 2014-04-16 | 南京航空航天大学 | Ultra wideband (UMB) filter |
| CN102638238A (en) * | 2012-04-17 | 2012-08-15 | 南京航空航天大学 | Capacity-coupling lumped-parameter double-frequency bandpass filter |
| CN103280616B (en) * | 2013-05-10 | 2015-04-15 | 南京信息工程大学 | Double-passband filter with left-hand performance |
| CN104201443B (en) * | 2014-08-14 | 2017-07-11 | 上海师范大学 | A kind of bifrequency Terahertz bandpass filter and preparation method thereof |
| CN106129558B (en) * | 2016-08-31 | 2019-05-14 | 中国电子科技集团公司第三十六研究所 | Meta Materials microwave filter based on opening resonance loop structure |
| CN110133377B (en) * | 2019-05-10 | 2021-05-25 | 杭州电子科技大学 | Differential microwave sensor for measuring dielectric constant and magnetic permeability of magnetic medium material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101212081A (en) * | 2006-12-29 | 2008-07-02 | 西北工业大学 | Double-row left-hand microstrip line for improving electromagnetic radiation of mobile telephone |
| CN101237081A (en) * | 2008-01-18 | 2008-08-06 | 东南大学 | Multi-resistance band and ultra-broadband antenna realized by split ring resonancer coupling feedback antenna |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5045349B2 (en) * | 2007-10-01 | 2012-10-10 | パナソニック株式会社 | Left-handed filter |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101212081A (en) * | 2006-12-29 | 2008-07-02 | 西北工业大学 | Double-row left-hand microstrip line for improving electromagnetic radiation of mobile telephone |
| CN101237081A (en) * | 2008-01-18 | 2008-08-06 | 东南大学 | Multi-resistance band and ultra-broadband antenna realized by split ring resonancer coupling feedback antenna |
Non-Patent Citations (2)
| Title |
|---|
| A Comparative investigation of SRR- and CSRR-Based Band-Reject Filters:Simulations,EXperiments,and Discussions;OZNAZLV.ERTURK;《Micorwave and Optical Technology Letters》;20081231;第50卷;第519-523页 * |
| OZNAZLV.ERTURK.A Comparative investigation of SRR- and CSRR-Based Band-Reject Filters:Simulations,EXperiments,and Discussions.《Micorwave and Optical Technology Letters》.2008,第50卷第519-523页. |
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