• Title, Summary, Keyword: Tapered microstrip

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A wideband balun of tapered structure using planar microstrip

  • Chang, Tae-Soon;Chang, Rae-Kim;Hur, Jung
    • Proceedings of the Korea Society of Information Technology Applications Conference
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    • pp.35-38
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    • 2005
  • In this paper, a wideband balun of tapered structure using planar microstrip is desigde ad analyzed. The balun structure was fabricated on a Teflon substrate with a thickness of 0.8mm and relative dielectric constant ${\varepsilon}_r$ of 2.5. Two back-to back CPW-to-CPS transitions were simulated and optimized using HFSS. A movel plaar balun using tapered structure of microstip to CPW is suggested and designed. The measurement result, the bandwidth for a reflection coefficient better than -10dB of the balun is 2GHz to 8GHz. The planar balun can improved the performance of wide band spiral antenna.

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Photonic-Assisted Reactive-Near-Field Analysis of a 3 dB-Tapered Ka-Band Array Antenna

  • Lee, Dong-Joon;Kang, Jeong-Jin;Kang, No-Weon;Kim, Wan-Sik;Park, Wee-Sang;Rothwell, Edward J.;Whitaker, John F.
    • Journal of electromagnetic engineering and science
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    • v.10 no.1
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    • pp.18-24
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    • 2010
  • A Ka-band microstrip array antenna for wide-range detection of moving targets is analyzed through a photonicassisted reactive-near-field characterization technique. The antenna array employs a 3-dB-tapered feed network to suppress the sidelobe level while retaining a wide azimuth beamwidth for a wide detection range. The relative nearelectric field patterns of the array and its 3-dB-tapered feed lines have been measured using an electro-optic fieldmapping technique for minimally invasive millimeter-wave sensing. A number of typical limitations on the technique, involving bandwidth, low signal-modulation depth, and high laser-induced noise in high-frequency applications, have been overcome by suppressing the carrier portion of the optical interrogation beam.

The Characteristics of Non-uniform Microstrip (불균일 카이크로스트립 선로의 특성)

  • 박기수
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.13 no.1
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    • pp.31-34
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    • 1976
  • In this paper, the characteristics, especially impedance matching behavior of linearly tapered transmission line which impedance is varied linearly is analyzed. Also impedance matching of nonuniform microstrip which characteristic impedance or width of strip is varied linearly are experimentally investigated.

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Cavity-backed Two-arm Spiral Antenna with a Ring-shaped Absorber for Partial Discharge Diagnosis

  • Kim, Han-Byul;Hwang, Keum-Cheol;Kim, Hyeong-Seok
    • Journal of Electrical Engineering and Technology
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    • v.8 no.4
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    • pp.856-862
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    • 2013
  • A cavity-backed two-arm spiral antenna for partial discharge diagnosis is presented. The proposed antenna consists of a two-arm Archimedean spiral, a tapered microstrip balun as spiral antenna feed, and a ring-shaped absorber-loaded cavity. The Archimedean spiral antenna is designed for the operating frequency band of 0.3 GHz to 1.5 GHz and fed by the tapered microstrip balun. The cavity is utilized to transform the bidirectional beam into a unidirectional beam, thereby enhancing gain. The ring-shaped absorber is stacked in the cavity to reduce the reflected waves from the cavity wall. The proposed antenna is designed and simulated using CST Microwave Studio. A prototype of the proposed antenna is likewise fabricated and tested. The measured radiation patterns are directional to the positive z-axis, and the measured peak gain is 8.13 dBi at a frequency of 1.1 GHz.

A Study of Wideband Method for the Millimeter-wave Planar Antenna (밀리미터파대 평면형 안테나의 광대역화 방안)

  • 이형수;설동범;이윤경;백락준;윤현보
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.11 no.2
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    • pp.206-216
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    • 2000
  • In this paper, the linear tapered slot(LTS) antenna and linear constant tapered slot(LCTS) antenna are optimized for millimeter-wave antenna by the finite difference time domain(FDTD) method and then fabricated and measured. The microstrip-to-slot transition is proposed with the widen $\lambda$/4 open stub as feeder for wide bandwidth of 16.5GHz($VSWR\leq2$). The results of the calculation and measurement, the bandwidth of LTS antanna is 8.3GHz(26.47%) and 7.1792GHz(22.4%) respectively. Also, the bandwidth of LCTS antenna is 8.1GHz(26.47%) and 6.3243GHz(20.43%) respectively.

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Synthesis of lossy tapered transmission line (손실을 갖는 테이퍼 전송선로의 합성)

  • Park, Eui-Joon
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.32A no.8
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    • pp.56-63
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    • 1995
  • A new method is presented for the synthesis of lossy tapered transmission line having presecribed frequency characteristic in the passband. The theory of lossy case extends lossless cases suggested by Klopfenstein and others, and a special optimization process based on the Fourier transfrom pair and generalized Taylor's procedure is proposed for exact designs of frequency-dependent and distance-dependent lossy tapered line. The process is achieved by control of zero points of lobe-like input reflection coefficient. The validity of the suggested method is confirmed by synthesizing a lossy microstrip transformer and analyzing the simulation results.

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Effects of Mesh Structure Variations of Meshed Ground on Microstrip Comb Array Antenna (그물망 접지의 그물망 구조의 변화가 MCAA에 미치는 영향)

  • Ki, Hyeon-Cheol
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.18 no.6
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    • pp.69-74
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    • 2018
  • In this paper, We investigated the effects of mesh structure variations of meshed ground on MCAA(Microstrip Comb Array Antenna). First, we designed MCAA in 24GHz ISM band and we investigated the variations of the gain and the SLL(Side Lobe Level) of the MCAA as we varied the mesh structure of the meshed ground. We varied two variables, mesh size and unfilled rato, which is defined as no metal area ratio in mesh for the investigation. We investigated two types of MCAA. Those are flat MCAA composed of flat radiator and tapered MCAA composed of tapered radiator. Both the antenna gains of flat MCAA and tapered MCAA are decreased as the unfilled rato increased. However, increase of mesh size made more dramatic decrease in antenna gain than increase of unfilled rato. The antenna SLL showed similar trend. But tapered MCAA affected more severely by variation of mesh size than flat MCAA.

Design and Experiment of V-LTSA with Microstrip-to-Coplanar Strip Line Feed (Microstrip-to-Coplanar Strip Line 급전구조를 갖는 V-LTSA 의 설계 및 실험)

  • 김혜리;김남현박노준강영진
    • Proceedings of the IEEK Conference
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    • pp.395-398
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    • 1998
  • In this paper, the design, fabrication, and experiments of linearly tapered slot antenna(LTSA) with uniplanar microstrip-to-coplanar strip(CPS) line transitions are presented. The effect of reducing and increasing with taper width G teper longth 1, and opening angle are also mesured at 10 GHz.

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Development of Flight Antennas for Micro Aerial Vehicle (소형 무인항공기 탑재형 안테나 개발)

  • Kim Duck-Hwan;Lee Kyu-Hwan;Kim Young-Sik
    • Journal of the Korea Institute of Military Science and Technology
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    • v.7 no.4
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    • pp.20-25
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    • 2004
  • The existing antenna that equipped with Micro Aerial Vehicle, microstrip antenna only can send and receive image signal because of limited bandwidth. But, proposed antenna that equipped with Micro Aerial Vehicle flight introduces tapered type patch antenna, also improves bandwidth then can transfer present location, altitude, movement speed. Furthermore, as a result of introduce stacked type, it transfers more quality of image signal, and represents most suitable performance in Korean peninsula that has many mountain peaks. In this paper, to transmit and receive the wideband signals with a antenna system, the wideband microstrip antenna is proposed and designed. This antenna operates at 2.4GHz. In this thesis, the resonance frequency of 2.4GHz and the reflective loss of the antenna of -22dB were calculated by measuring the fabricated Tapered Microstrip Patch Antenna which was designed with the resonance of 2.4GHz. The calculated gain and efficiency of antenna were 6.7dB and $60\%$ respectively. The characteristic of the bandwidth shows with $50\~60MHz$ which is $6.02\%$ at the basis of -l5dB reflective loss. The experimental results can be used in the characteristic of the resonators and this antenna produces a greatly enhanced bandwidth.

Design of An X-Band Microstrip Array Antenna (X-대역 마이크로스트립 배열 안테나 설계)

  • 윤용민;이석곤;최재현;노진입;김동환;안병철
    • Proceedings of the IEEK Conference
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    • pp.447-450
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    • 2002
  • In this paper, we present design methods for a series-fed microstrip patch array operating at X-band frequency. The array consists of 18 rectangular patches connected to 3 quarter-wave impedance transformers. The power divider is designed for the uniform element excitation. The element excitation is then made to be tapered by increasing the input impedance of elements located at array edges. The designed antenna is fabricated and tested. Results of test show a fair agreement with the prediction.

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