CN104466318A - Miniaturized dual-band band-pass microwave filter based on spiral defected ground structure - Google Patents
Miniaturized dual-band band-pass microwave filter based on spiral defected ground structure Download PDFInfo
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- CN104466318A CN104466318A CN201410667231.8A CN201410667231A CN104466318A CN 104466318 A CN104466318 A CN 104466318A CN 201410667231 A CN201410667231 A CN 201410667231A CN 104466318 A CN104466318 A CN 104466318A
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Abstract
A miniaturized dual-band band-pass microwave filter based on a spiral defected ground structure comprises a ground plate and a dielectric layer with which the ground plate is covered. Z-shaped defected grounds are formed on the ground plate symmetrically or equi-directionally. The dielectric layer is further provided with T-shaped microstrip lines. The T-shaped microstrip lines are arranged corresponding to the Z-shaped defected grounds in a coupled mode. The Z-shaped defected grounds on the ground plate are of a dual spiral defected ground structure which is a spiral structure formed by extending branches at the two ends of each Z-shaped defected ground respectively. The T-shaped microstrip lines are located over the Z-shaped defected grounds. The Z-shaped defected grounds and the T-shaped microstrip lines have the same symmetric center. According to the miniaturized dual-band band-pass microwave filter, two different types of dual-band band-pass filters are implemented, and the miniaturized dual-band band-pass microwave filter has the properties of good selectivity, large bandwidth, small pass band damping and the like; accordingly, the defects that a traditional dual-band band-pass filter is large in manufactured size and high in cost are effectively overcome.
Description
Technical field
The present invention relates to the logical microwave filter of a kind of band.Particularly relate to a kind of miniaturized dual-band band based on spiral defect ground structure and lead to microwave filter.
Background technology
Along with the development of wireless communication technology, the demand of miniaturized microwave device increases day by day.Microwave filter is as one of Primary Component in modern microwave device, be used to a kind of device being separated different frequency microwave signal, its Main Function suppresses unwanted signal, make it not by filter, only allow the signal needed pass through, have in the systems such as millimetre-wave attenuator, radar navigation, electronic countermeasures, missile guidance, test instrumentation and act on widely.In microwave circuit system, the performance index of performance to circuit of filter have a great impact, and therefore, how to improve the characteristic of the selection of filter, and the size reducing them becomes the focus of research now.
Along with the multi-band wireless system of development in recent years, double band bandpass filter receives much concern.Researcher has done a lot of work in this respect, it is also proposed many methods for designing.But, under how realizing the prerequisite increasing design size in little amplitude and improve cost of manufacture, Design and manufacture goes out to have size little, logical in-band insertion loss is low, and the double band bandpass filter of the characteristics such as selectivity is good remains an important topic of present researcher and production firm's needs solution.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of miniaturized dual-band band based on spiral defect ground structure that can be produced two frequency bands by the Multiple modes coupling between T-type microstrip line and spiral defect ground to lead to microwave filter.
The technical solution adopted in the present invention is: a kind of miniaturized dual-band band based on spiral defect ground structure leads to microwave filter, include substrate and cover the dielectric layer on ground plate, described ground plate is formed with the Z-type defect ground be symmetrical arranged or arrange in the same way, described dielectric layer is also provided with T-shaped microstrip line, and described T-shaped microstrip line is corresponding and the setting be coupled with described Z-type defect ground.
Z-type defect ground on described ground plate is double helix defect ground structure, and described double helix defect ground structure is that the branch road at two ends, described Z-type defect ground extends formation helical structure respectively.
Described T-shaped microstrip line is positioned at directly over Z-type defect ground, and described Z-type defect ground has identical symmetrical centre with described T-shaped microstrip line.
Miniaturized dual-band band based on spiral defect ground structure of the present invention leads to microwave filter, achieve two kinds of dissimilar double band bandpass filters, this double band bandpass filter has good selectivity, wider bandwidth and the performance such as pass band damping is little, efficiently solve conventional dual band band pass filter manufactured size large, the defect that cost is high.By changing the total length of helical structure and the size of T-type microstrip line of second order double band bandpass filter, can adjust the centre frequency of passband, the adjustment of the distance between two spiral defect ground can change pass band width.By accurately controlling structural parameters of the present invention, the high-performance Dual-band microwave filter of satisfied different demand can be obtained.
Accompanying drawing explanation
Fig. 1 is Z-type defect ground structure schematic diagram of the present invention;
Fig. 2 a be the Z-type defect that arranges in the same way of the present invention with the position relationship schematic diagram of T-shaped microstrip line;
Fig. 2 b be the present invention's symmetrically arranged Z-type defect with the position relationship schematic diagram of T-shaped microstrip line;
Fig. 3 is the end view of Fig. 2 a or Fig. 2 b;
Fig. 4 is the schematic diagram of double helix defect ground structure of the present invention;
Fig. 5 is the structural representation of the double band bandpass filter of the double helix defect ground structure of Second-order Symmetric form of the present invention;
Fig. 6 is the structural representation of the second order of the present invention double band bandpass filter of the double helix defect ground structure of form in the same way;
Fig. 7 is the structural representation of the T-shaped microstrip line of the present invention;
Fig. 8 is the transmission characteristic of the double band bandpass filter of Second-order Symmetric double helix defect ground structure and the double band bandpass filter of second order plectonemic spiral defect ground structure.
In figure
1: substrate 2: dielectric layer
3:T type microstrip line 4:Z type defect ground
41: branch road 42: branch road
43: central shaft
Embodiment
Lead to microwave filter below in conjunction with embodiment and accompanying drawing to the miniaturized dual-band band based on spiral defect ground structure of the present invention to be described in detail.
As shown in Figure 1, Figure 2 shown in a, Fig. 2 b, Fig. 3, miniaturized dual-band band based on spiral defect ground structure of the present invention leads to microwave filter, the dielectric layer 2 including ground plate 1 and cover on ground plate 1, described ground plate 1 is formed with the Z-type defect ground 4 be symmetrical arranged or arrange in the same way, described dielectric layer 2 is also provided with T-shaped microstrip line 3, and described T-shaped microstrip line 3 is corresponding and the setting be coupled with described Z-type defect ground 4.
So-called defect ground on complete ground electrode, removes a part and defect sturcture on the ground electrode that formed.Find after deliberation, the Z-type defect that is symmetrical arranged or arranges in the same way ground 4 and T-shaped microstrip line 3 (structure is as shown in Fig. 2 a, Fig. 2 b) formed be coupled, obvious bandpass characteristics can be produced.In this structure, Z-type defect ground 4 is in the bottom surface of pcb board, and T-shaped microstrip line 3 is at the end face of pcb board.Described T-shaped microstrip line 3 is positioned at directly over Z-type defect ground 4, and described Z-type defect ground 4 has identical symmetrical centre with described T-shaped microstrip line 3.
In order to strengthen this coupling further, need the branch road at the two ends on Z-type defect ground is extended further, but this scheme is unfavorable for the miniaturization of design of filter.For this reason, the present invention, by the branch road bending fold on Z-type defect ground, is deformed into double-spiral structure from original simple broken line shape.As shown in Figure 3, the Z-type defect ground 4 on described ground plate 1 is double helix defect ground structure, and described double helix defect ground structure is that the branch road 41,42 at 4 two ends, described Z-type defect ground extends formation helical structure respectively.
With being out of shape the double-stranded Z-type defect being symmetrical arranged or arranging in the same way later obtained respectively as shown in Figure 5, Figure 6.Being coupled between this double-spiral structure with T-shaped microstrip line 3 obviously strengthens, thus optimizes filtering characteristic, and achieves miniaturization and the dual-band performance of design of filter.
Have in the same way with the transmission characteristic of the band pass filter of the double helix defect ground structure of symmetry as shown in Figure 8.As can be seen from the figure, near 1.9GHz and 2.6GHz, all there are two passbands that insertion loss is low, frequency selectivity is good in two kinds of filters.
The manufacturing process that miniaturized dual-band band based on spiral defect ground structure of the present invention leads to microwave filter is:
Repeat folding Z-type defect ground structure and obtain the double helix defect ground structure shown in Fig. 4, folded part is 1a and 1b in figure.Spiral defect ground structure shown in Fig. 4 obtains the 3a shown in Fig. 5 by symmetry transformation, 3b version, can obtain 4a, 4b version in Fig. 6 by translation transformation, and these two kinds of forms all produce similar frequency response.5a (5b) in Fig. 7,6a (6b) are the T-shaped microstrip line construction on dielectric layer.What the present invention proposed is symmetrical arranged or arranges in the same way these two kinds multi-form double band bandpass filters, is the upper and lower surface at pcb board, is made up of two kinds of multi-form spiral defect ground structures and symmetrical T-shaped microstrip line construction.
Best, the T-shaped microstrip line construction of second order double band bandpass filter drops on directly over spiral defect ground structure, has identical symmetrical centre.
Best, in this example, ground plate selects dielectric constant to be 2.2, and tangent angle loss is 0.0009, and thickness is the Rogers RT/duroid 5880 (tm) of 0.508mm.
Best, concrete size of the present invention is as follows:
Double-spiral structure 3 (a), 3 (b), 4 (a), the length of the central shaft (43 namely shown in Fig. 1) of 4 (b) is 3.6mm, width is 0.5mm, 4 (a), and 4 (b) bifilar helix (i.e. 1a and 1b of Fig. 3) total length is 33.5mm, the width of helix is 0.2mm, and the spacing between folding helix is the distance G1 between 0.2mm. two spiral defect ground is 1mm.The length of T-shaped microstrip line 5a, 5b is 5.4mm, and width is 1mm, and the length of T-shaped microstrip line 6a, 6b is 4.6mm, and width is 1.2mm, and the spacing between two T-shaped microstrip lines is 0.4mm.
In sum, the miniaturized dual-band band based on spiral defect ground structure of the present invention leads to microwave filter, is realize dual-band performance by multi-form being coupled between double helix defect ground structure with T-shaped microstrip line construction.The double band bandpass filter realized by this coupling can be good at realizing miniaturized and reaching high performance object.
Although the foregoing describe the specific embodiment of the present invention, these only illustrate, scope is defined by the appended claims.Those skilled in the art, under the prerequisite not deviating from principle of the present invention and essence, can modify these execution modes or change, but these modifications and changes all fall into protection scope of the present invention.
Claims (3)
1. one kind leads to microwave filter based on the miniaturized dual-band band of spiral defect ground structure, include substrate (1) and cover the dielectric layer (2) on ground plate (1), it is characterized in that, on described ground plate (1) with being formed with the Z-type defect be symmetrical arranged or arrange in the same way (4), described dielectric layer is also provided with T-shaped microstrip line (3), described T-shaped microstrip line (3) and described Z-type defect ground (4) are corresponding and the setting be coupled.
2. the miniaturized dual-band band based on spiral defect ground structure according to claim 1 leads to microwave filter, it is characterized in that, Z-type defect ground (4) on described ground plate (1) is double helix defect ground structure, described double helix defect ground structure be described Z-type defect the branch road (41,42) at (4) two ends extends formation helical structure respectively.
3. the miniaturized dual-band band based on spiral defect ground structure according to claim 1 and 2 leads to microwave filter, it is characterized in that, described T-shaped microstrip line (3) is with being positioned at Z-type defect directly over (4), and described Z-type defect ground (4) has identical symmetrical centre with described T-shaped microstrip line (3).
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| CN201410667231.8A CN104466318A (en) | 2014-11-20 | 2014-11-20 | Miniaturized dual-band band-pass microwave filter based on spiral defected ground structure |
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| CN201410667231.8A CN104466318A (en) | 2014-11-20 | 2014-11-20 | Miniaturized dual-band band-pass microwave filter based on spiral defected ground structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3449529A4 (en) * | 2016-04-29 | 2019-12-25 | Commscope Technologies LLC | Microstrip capacitors with complementary resonator structures |
| US11228077B2 (en) | 2019-06-17 | 2022-01-18 | Carrier Corporation | Microstrip DC block |
| JP7461362B2 (en) | 2019-01-23 | 2024-04-03 | インクスペース イメージング インコーポレイテッド | flexible resonant trap circuit |
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| US20070194864A1 (en) * | 2006-02-03 | 2007-08-23 | Samsung Electronics Co., Ltd. | DC block with band-notch characteristics using DGS |
| CN204189931U (en) * | 2014-11-20 | 2015-03-04 | 天津大学 | Miniaturized dual-band band based on spiral defect ground structure leads to microwave filter |
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2014
- 2014-11-20 CN CN201410667231.8A patent/CN104466318A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070194864A1 (en) * | 2006-02-03 | 2007-08-23 | Samsung Electronics Co., Ltd. | DC block with band-notch characteristics using DGS |
| CN204189931U (en) * | 2014-11-20 | 2015-03-04 | 天津大学 | Miniaturized dual-band band based on spiral defect ground structure leads to microwave filter |
Non-Patent Citations (3)
| Title |
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| CHUL-SOO KIM等: ""The Equivalent Circuit Modeling of Defected Ground Structure with Spiral Shape"", 《MICROWAVE SYMPOSIUM DIGEST2002》 * |
| YONG YANG 等: ""Design of A Novel Compact Lowpass Filter with Defected Ground Structure and Open Stubs"", 《RADIO-FREQUENCY INTEGRATION TECHNOLOGY2014》 * |
| 朱永忠 等: ""一种曲折型缺陷地结构超宽带滤波器的设计"", 《西安交通大学学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3449529A4 (en) * | 2016-04-29 | 2019-12-25 | Commscope Technologies LLC | Microstrip capacitors with complementary resonator structures |
| US10811755B2 (en) | 2016-04-29 | 2020-10-20 | Commscope Technologies Llc | Microstrip capacitors with complementary resonator structures |
| JP7461362B2 (en) | 2019-01-23 | 2024-04-03 | インクスペース イメージング インコーポレイテッド | flexible resonant trap circuit |
| US11228077B2 (en) | 2019-06-17 | 2022-01-18 | Carrier Corporation | Microstrip DC block |
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