CN103730721A - Bow-tie slot antenna based on coplanar waveguide feed - Google Patents

Bow-tie slot antenna based on coplanar waveguide feed Download PDF

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Publication number
CN103730721A
CN103730721A CN201410001004.1A CN201410001004A CN103730721A CN 103730721 A CN103730721 A CN 103730721A CN 201410001004 A CN201410001004 A CN 201410001004A CN 103730721 A CN103730721 A CN 103730721A
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bow
antenna
tie
wave guide
gap
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CN103730721B (en
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张文梅
陈新伟
李莉
韩丽萍
许莉娜
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Guangzhou Shichen Communication Technology Co ltd
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Shanxi University
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Abstract

The invention relates to small broadband antennae, in particular to a bow-tie slot antenna based on coplanar waveguide feed. The antenna comprises an earth plate (1) and a dielectric substrate (2), wherein the earth plate (1) is etched with bow-tie slots (3), the two bow-tie slots are bilaterally symmetrical to the X-axis with the center of the dielectric substrate as the origin of coordinates, asymmetrical coplanar waveguide feed is adopted, and annular conduction bands (7) are loaded inside the bow-tie slots. By lengthening and bending one feed slot, impedance matching of the antenna is improved, and the bandwidth of the antenna is increased. Due to the fact that the triangular annular conduction bands are loaded inside the bow-tie slots, low-frequency gains of the antenna are improved, and the gains of the antenna in a working band are made flatter. The antenna works at 2.76-8.1 GHz, relative bandwidth reaches 150.84%, the gains in the working band are all larger than 1.5dBi, and the maximum gain can reach 5.53dBi. The bow-tie slot antenna based on coplanar waveguide feed is simple in design, easy to machine, and suitable for a broadband wireless communication system.

Description

Bow-tie slot based on coplanar wave guide feedback
Technical field
The present invention relates to wireless communication technology, particularly wireless communication system miniaturization broad-band antenna, is specially a kind of bow-tie slot based on coplanar wave guide feedback.
Background technology
Along with radio communication is fast-developing, the communication systems such as global positioning system, satellite communication, personal communication are had higher requirement to the broadband of antenna and miniaturization.All channel antenna can cover a plurality of frequency ranges, can reduce the number of the required antenna of communication system, thereby can reduce system cost, weight reduction.
Bow-tie slot, because of broader bandwidth, the advantage such as miniaturization more, has been subject to extensive concern.As shown in Figure 1, gap length and the width on conduction band both sides, co-planar waveguide center are all identical for the structure of the butterfly type antenna of conventional co-planar waveguide (CPW) feed.Through numerous scholars' continuous effort, there is the method for multiple Bandwidth, as butterfly type antenna is combined with a period of time antenna, can obtain 10.32% wide bandwidth (Gu Donghua etc., CPW-fed Bow-tie Dipolar Slot Antenna, microwave journal, 27 (2007), 25-28); Adopt the butterfly gap of rectangular edges, obtained 67% impedance bandwidth (Su Xiaoen etc., simulation analysis and the design of coplanar wave guide feedback broadband rectangular edges bow-tie slot, microwave journal, 22 (2006), 35-39).The impedance bandwidth of existing techniques in realizing is less.
Summary of the invention
The object of the present invention is to provide the bow-tie slot based on asymmetric coplanar wave guide feedback of a kind of miniaturization, ultra broadband, gain stabilization, not only there is good broadband impedance characteristic, and have the gain characteristic of relatively flat, and antenna area does not increase.
Design of the present invention is as follows: the present invention mainly forms by butterfly gap and for the asymmetric co-planar waveguide of its feed, regulate the length in one of them gap of co-planar waveguide, the asymmetric co-planar waveguide forming can be adjusted antenna impedance, improve its impedance matching, the frequency band of a plurality of separation is connected together, thereby obtained a kind of antenna of ultra broadband.
The present invention adopts following technical scheme to realize:
A kind of bow-tie slot based on coplanar wave guide feedback, comprise ground plate, medium substrate, ground plate etching butterfly gap, selecting medium substrate center is the origin of coordinates, two butterfly gaps are symmetrical about X-axis, adopt coplanar wave guide feedback, described coplanar wave guide feedback is asymmetrical coplanar wave guide feedback; Inside, described butterfly gap is loaded with annular conduction band.
Described asymmetric co-planar waveguide consists of center conduction band and the first gap and the second gap, and the first gap lengthens and be crooked, forms asymmetrical co-planar waveguide.
Described annular conduction band is triangle annular conduction band.
Compared with prior art tool of the present invention has the following advantages: by adopting asymmetric coplanar wave guide feedback, improved the impedance operator of antenna, greatly improved the bandwidth of antenna, made bow-tie slot can be operated in 2.76～8.1GHz, relative bandwidth reaches 150.84%.By load triangle annular conduction band in butterfly gap, improved the gain characteristic of antenna, make the gain of antenna in working band more smooth.
Accompanying drawing explanation
Fig. 1 is the bow-tie slot structural representation of conventional co-planar waveguide feed
Fig. 2 is the bow-tie slot structural representation of asymmetric coplanar wave guide feedback of the present invention
In figure: 1-ground plate, 2-medium substrate, 3-butterfly gap, 4-, 5-asymmetric co-planar waveguide the first gap and the second gap, the asymmetric co-planar waveguide of 6-center conduction band, 7-triangle annular conduction band
Fig. 3 is the S of broad-band antenna of the present invention 11
Fig. 4 is the impedance operator of broad-band antenna of the present invention
Fig. 5 is the gain of broad-band antenna of the present invention
Fig. 6 is that broad-band antenna of the present invention is at the directional diagram of 4GHz and 6GHz
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention are elaborated:
As shown in Figure 2, the bow-tie slot of the asymmetric coplanar wave guide feedback of employing of the present invention comprises ground plate 1 and medium substrate 2, selecting medium substrate center is the origin of coordinates, on ground plate 1, be etched with as the butterfly gap 3 of radiating element and be the asymmetric co-planar waveguide of butterfly cutler feed, butterfly gap 3 is symmetrical about X-axis, for improving low-frequency gain, in butterfly gap, loaded leg-of-mutton annular conduction band 7; Asymmetric co-planar waveguide is comprised of the gap 4,5 on center conduction band 6 and both sides, and wherein the gap 4 on the right is bent, and length increases, and has formed the asymmetric co-planar waveguide that both sides gap length does not wait.
Accompanying drawing 3 shows the bow-tie slot S that adopts asymmetric coplanar wave guide feedback 11frequency characteristic (in figure, curve 2), wherein abscissa represents frequency variable, unit is GHz, ordinate represents amplitude variable, unit is dB.For convenience of relatively, in figure, give the S of the antenna that adopts conventional co-planar waveguide feed 11(in figure, curve 1), can find out, for the antenna of traditional employing coplanar wave guide feedback, has three resonance frequency f 1=3.28GHz, f 2=7.0GHz, f 3=10.66GHz.Three working bands are spaced, form three independent frequency bands, when adopting asymmetric coplanar wave guide feedback, the lengthening of feed gaps has improved the impedance matching of antenna, three frequency bands link together, and the working band that makes antenna is 2.76～8.1GHz, and absolute bandwidth is 5.34GHz, relative bandwidth is 150.84%, by broadening greatly.
Accompanying drawing 4 shows the bow-tie slot impedance operator (in figure, curve 2) that adopts asymmetric coplanar wave guide feedback, and the result (in figure, curve 1) when adopting conventional co-planar waveguide feed compares.In figure, abscissa represents frequency variable, and unit is GHz, and ordinate represents impedance, and unit is ohm.While adopting traditional coplanar wave guide feedback, except resonance point, antenna is higher in other frequency impedance, maximum can reach 146 Ω, after the gap (4) on the right lengthens, the impedance of antenna all drops near 50 ohm within the scope of 2.76～8.1GHz, thereby makes the impedance matching of this working range reach improvement.
Accompanying drawing 5 shows the gain characteristic (being respectively the curve 1 and 2 in figure) of the bow-tie slot that adopts conventional co-planar waveguide and asymmetric coplanar wave guide feedback, and compares with the result (curve 3 in figure) having loaded after triangle annular conduction band.In figure, abscissa represents frequency variable, and unit is GHz, ordinate representative gain, and unit is dBi.Can see, load before triangle annular conduction band, compare with adopting the antenna of conventional co-planar waveguide feed, adopt after asymmetric coplanar wave guide feedback, the gain of antenna is except 4～5.7GHz, gain at other frequency places all decreases, load after annular conduction band, the gain of 2-7GHz frequency range is all improved, especially at 3GHz place, antenna gain is brought up to 2.4dBi from 0.8dBi, thereby makes the gain in whole working band more smooth.
Accompanying drawing 6 shows the directional diagram of the bow-tie slot that adopts asymmetric coplanar wave guide feedback, wherein figure (a) is the directional diagram at 4GHz, figure (b) is the directional diagram at 6GHz, in figure, curve 1 is H face main pole, curve 2 is the cross polarization of H face, and curve 3 is E face main pole, and curve 4 is the cross polarization of E face.Can find out, E face main pole directional diagram is the figure of eight, has certain directivity, and cross polarization is larger.The radiation in the time of 0 °～180 ° of H face main pole directional diagram is better, and cross polarization is larger.Along with the rising of frequency, antenna main pole directional diagram is substantially undistorted.

Claims (3)

1. the bow-tie slot based on coplanar wave guide feedback, comprise ground plate (1), medium substrate (2), ground plate (1) etching butterfly gap (3), selecting medium substrate center is the origin of coordinates, two butterfly gaps are symmetrical about X-axis, adopt coplanar wave guide feedback, it is characterized in that:
Described coplanar wave guide feedback is asymmetrical coplanar wave guide feedback;
Inside, described butterfly gap is loaded with annular conduction band (7).
2. a kind of bow-tie slot based on asymmetric coplanar wave guide feedback as claimed in claim 1, it is characterized in that, described asymmetric co-planar waveguide consists of center conduction band (6) and the first gap (4) and the second gap (5), and the first gap (4) lengthen and be crooked.
3. a kind of bow-tie slot based on asymmetric coplanar wave guide feedback as claimed in claim 1, is characterized in that, described annular conduction band (7) is triangle annular conduction band.
CN201410001004.1A 2014-01-02 2014-01-02 Based on the bow-tie slot of coplanar wave guide feedback Active CN103730721B (en)

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CN104505586A (en) * 2014-12-12 2015-04-08 上海大学 Dual-frequency screen-printed triangular gap array antenna
CN105305044A (en) * 2015-10-12 2016-02-03 国网上海市电力公司 High-frequency ground penetrating radar dish antenna for detecting fractures
KR101729535B1 (en) * 2016-03-11 2017-05-02 연세대학교 산학협력단 High directive small bowtie type antenna
CN108199133A (en) * 2018-01-03 2018-06-22 江苏省东方世纪网络信息有限公司 Antenna
CN109449554A (en) * 2018-11-20 2019-03-08 中国科学院国家天文台 A kind of novel butterfly oscillator orthogonal mode polarization coupler
CN109921181A (en) * 2019-04-10 2019-06-21 西南交通大学 A kind of bilayer butterfly antenna
CN110247174A (en) * 2018-03-09 2019-09-17 通用汽车环球科技运作有限责任公司 The asymmetric slot antenna in broadband
CN110416722A (en) * 2019-08-29 2019-11-05 南京信息工程大学 A kind of equilateral triangle ring structure gap broadband antenna

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104505586A (en) * 2014-12-12 2015-04-08 上海大学 Dual-frequency screen-printed triangular gap array antenna
CN104505586B (en) * 2014-12-12 2017-07-25 上海大学 A kind of double frequency plane prints triangle slot array antenna
CN105305044A (en) * 2015-10-12 2016-02-03 国网上海市电力公司 High-frequency ground penetrating radar dish antenna for detecting fractures
KR101729535B1 (en) * 2016-03-11 2017-05-02 연세대학교 산학협력단 High directive small bowtie type antenna
CN108199133A (en) * 2018-01-03 2018-06-22 江苏省东方世纪网络信息有限公司 Antenna
CN110247174A (en) * 2018-03-09 2019-09-17 通用汽车环球科技运作有限责任公司 The asymmetric slot antenna in broadband
CN109449554A (en) * 2018-11-20 2019-03-08 中国科学院国家天文台 A kind of novel butterfly oscillator orthogonal mode polarization coupler
CN109449554B (en) * 2018-11-20 2024-02-02 中国科学院国家天文台 Novel butterfly oscillator orthomode polarization coupler
CN109921181A (en) * 2019-04-10 2019-06-21 西南交通大学 A kind of bilayer butterfly antenna
CN109921181B (en) * 2019-04-10 2024-05-14 西南交通大学 Double-layer butterfly antenna
CN110416722A (en) * 2019-08-29 2019-11-05 南京信息工程大学 A kind of equilateral triangle ring structure gap broadband antenna
CN110416722B (en) * 2019-08-29 2024-02-23 南京信息工程大学 Equilateral triangle ring structure gap broadband antenna

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