• 한국초전도학회:학술대회논문집
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• 한국초전도학회 2000년도 High Temperature Superconductivity Vol.X
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• pp.197-200
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• 2000

In this paper, we present a novel methodology for a wideband HTS antenna of finite length placed on a dielectric substrate. A methodology used in this work is based on a moment-method techniques with Green function singularity when the field point is in the source triangle. The designed resonance frequency of our HTS antenna is 11.85 GHz. The return loss is -26 dB. The bandwidth obtained is a significant 10.6 %. Experimental measurements for a HTS antenna designed in X-band are shown to agree well with the simulated prediction.

• Journal of information and communication convergence engineering
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• 제6권4호
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• pp.391-395
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• 2008

Wideband terminal and base station is required to serve not only existing 1st and 2nd generation mobile communication systems but also 3rd generation systems. In this paper, we present a feasibility study on coaxial feed compact wideband antenna for UHF RFID reader application. The original antenna was designed for partial discharge detection sensor in high voltage diagnostic system. However, we modified the original prototype to achieve shifted down resonant frequency for wideband wireless communication applications. The experimental result shows good return loss characteristics and radiation patterns except for the total gain at each resonant frequency. The maximum measured gain was 2.45 dBi$\sim$3.18 dBi at 910MHz.

• Journal of information and communication convergence engineering
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• 제6권2호
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• pp.164-168
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• 2008

Wideband terminal and base station is required to serve not only existing 1st and 2nd generation mobile communication systems but also 3rd generation systems. In this paper, we presents a feasibility study on single feed compact wideband antenna for wireless communication applications including GSM (890-960 MHz), GPS (1575 MHz), DCS (1710-1880 MHz), PCS (1880-1990 MHz), UMTS (1900-2200 MHz), ISM (2400-2480 MHz), IMT2000 and satellite DMB bands. The original antenna was designed for partial discharge detection sensor in high voltage diagnostic system. However, we modified the original prototype to achieve shifted down resonant frequency for wideband wireless communication applications. The experimental result shows good return loss characteristics and radiation patterns except for the total gain at each resonant frequency. The maximum measured gain was 2.45 dBi${\sim}$3.18 dBi at 1710 MHz${\sim}$1880 MHz.

• Journal of electromagnetic engineering and science
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• 제17권3호
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• pp.133-137
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• 2017

In this study, a 28-GHz U-slot array antenna for a wideband communication system is proposed. The U-slot patch antenna structure consists of a patch, two U-shaped slot, and a ground plane. With the additional U-slot, the proposed antenna has around 10% of bandwidth at -10 dB. To increase gain, the U-slot antenna is arrayed to $2{\times}2$. The proposed antenna is designed and fabricated. The $2{\times}2$ array antenna volume is $41.3mm{\times}46mm{\times}0.508mm$. The proposed antenna was measured and compared with the simulation results to prove the reliability of the design. The bandwidth and gain of the measurement results are 3.35 GHz and 13 dBi, respectively and the operating frequency is around 28 GHz.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 추계학술대회
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• pp.67-68
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• 2013

본 논문에서는 1-15GHz 주파수 대역에서 동작하는 초광대역 인쇄형 다이폴 안테나에 대한 설계방법을 연구하였다. 초광대역 특성을 얻기 위하여 반원 모양의 다이폴 소자를 이용하여 두 팔 사이의 간격과 반원의 반지름 변화에 따른 입력 반사계수와 이득 특성을 분석하여 최적의 설계 변수를 도출하였다. 최적화된 인쇄형 반원모양 다이폴 안테나를 FR4 기판 상에 $100mm{\times}100mm$ 크기로 제작하였다. 실험 결과, 전압 정재파비(VSWR; voltage standing wave) < 2인 대역이 1-15 GHz (대역폭 비 15:1, 175%)으로 초광대역 특성을 갖는 것을 확인하였다.

• Journal of information and communication convergence engineering
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• 제16권4호
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• pp.252-257
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• 2018

A wideband double radiator circular disc annular monopole antenna is proposed is this work. The radiators are etched on the surfaces of two Taconic TLY-5 substrates with a circular hole cut out of each of the radiators initially at the centers of the radiators with subsequent downward displacement of the holes. The antenna is designed with a two-step feeding transformer system for impedance matching between the input power source supplied by a $50-{\Omega}$ SMA connector and the monopole radiators. The transformer system improves the bandwidth performance at higher frequencies. The proposed antenna achieves a wideband having the capability of working between 0.645 and 18.775 GHz, corresponding to a -10 dB bandwidth of 186.7% with gain ranging from 0.95 to 8.26 dBi. In comparison to other metal disc planar monopole antennas, the proposed antenna has a small total size width due to the size of the ground plane, which has a diameter 100 mm. The frequency range of the antenna provides applications in global positioning systems, mobile communications, ultra-wideband short distance communications, and wireless computer networks.

• 한국전자파학회논문지
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• 제13권4호
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• pp.366-372
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• 2002

L-스트립 급전선에 의해서 급전되는 광대역 적층 패치 안테나를 실험적으로 연구하였다. 본 논문의 목표는 PCS와 IMT-2000 서비스를 위한 소형 광대역 안테나를 설계하는데 있다. 실험결과에서 704.7 MHz(35.95 %)의 임피던스 대역폭(VSWR$\leq$2)이 PCS와 IMT-2000 주파수 대역에서 얻어지는 것을 확인하였다. 연구된 안테나는 단순한 구조 때문에 어레이 확장이 쉽게 설계될 수 있다.

• 한국전자파학회논문지
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• 제20권2호
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• pp.208-214
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• 2009

UWB USPR 시스템 응용 초광대역 마이크로스트립-CPS(Coplanar Stripline) 발룬을 이용한 self-complementary 스파이럴 안테나의 설계와 실험적 결과를 제시하였다. 초광대역 특성을 갖는 평면형 마이크로스트립-CPS 발룬을 적용하여 스파이럴 안테나 고유의 초광대역 특성을 유지하게 하였고, 각각 설계된 안테나와 발룬을 임피던스 정합의 방법을 이용하여 연결함으로 간단한 안테나 설계 과정을 보였다. 설계된 스파이럴 안테나는 등각 형태의 self-complementary 스파이럴 안테나이다. 제작된 안테나는 2.9 GHz에서 12 GHz의 넓은 주파수 특성을 가지며, 2.7에서 5.3 dB의 비교적 평탄한 이득과 $70^{\circ}$ 이상의 빔 폭을 가졌다. 이 결과를 통해 초광대역 마이크로스트립-CPS 발룬의 스파이럴 안테나의 적용 가능성을 검증하였다.

• 한국전자통신학회논문지
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• 제11권3호
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• pp.263-270
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• 2016

본 논문에서는 변형된 항아리형 패치안테나를 사용하여 초 광대역 안테나를 구현하였다. 설계한 패치안테나의 물리적 길이와 홈(노치)를 광대역 특성 조건으로 최적화시켰으며, $10mm{\times}21.8mm$크기로 설계된 변형된 항아리형 패치안테나를 제작하였다. 설계된 최적화 패치안테나의 표면 전류분포를 분석하고 초 광대역 특성 조건을 만족함을 확인하였다. 실험 결과 제작된 초 광대역 패치안테나의 입력반사손실은 -10 dB 이하로 전압정재파비 역시 2 이하의 특성을 나타내었으며, 3.1~10.6 GHz 대역에서 약 1~3 dBi 이득범위를 나타내었다. 이와 같은 실험결과는 초 광대역 통신시스템에 활용이 가능할 것으로 판단된다.

• ETRI Journal
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• 제28권3호
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• pp.383-385
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• 2006

A new meander-line antenna consisting of two open-ended strips is proposed for a compact and broadband UHF radio frequency identification tag. An equivalent circuit model for the proposed antenna is derived and used to perform a simple and wideband impedance match to an arbitrary complex impedance of a tag chip without any additional matching network. The performance of the proposed antenna is validated by comparing calculated and measured results, which show good agreement.