• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2004년도 추계학술대회
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• pp.5-8
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• 2004

In this paper, a novel 400MHz band small meander microstrip antenna is proposed the shape of the proposed antenna is a waved meander microstrip with a pair rf short pins on th￡ edge. the length of waved meander microstrip is $\lambda_g/4$ but it bends to half its size. Therefore, the total size of the proposed antenna is reduced to about 1/20 which is compared with a square patch antenna the simulated antenna gain is about 3dBi at 424MHz. the proposed antenna of -10dB impedance bandwidth is measured about $1.4\%$.

• ETRI Journal
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• 제34권6호
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• pp.974-977
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• 2012

In this letter, a small-sized ultra-high frequency (UHF) RFID tag antenna for a medical sample tube is proposed. The RFID tag antenna is designed and fabricated based on the circular loop antenna used in the UHF band (Korea standard, 917 MHz to 923.5 MHz). The tag antenna size is reduced using a circular meander stub. The antenna has a physical size of 8 mm, which is about ${\lambda}$/40 in electrical length. The proposed tag antenna is molded into a medical sample and multitag identification is performed.

• 전기학회논문지
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• 제56권4호
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• pp.768-772
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• 2007

Integration of RF front end module(FEM) into the antenna has been investigated in USPCS band (1.88GHz-1.99GHz). The FEM consists of input filter, power amplifier, coupler, power detector, bias switch and duplexer. The antenna was designed in planar inverted F antenna(PIFA) structure to implement it inside the handset. In order to avoid strong coupling between the antenna and FEM, a shielding ground layer was placed between them. The antenna size is 19mm by 10mm by 6mm under which FEM whose size is 8mm by 5mm by 1.5m locates. The antenna impedance was selected to match to FEM having better efficiency rather than gain since FEM has enough gain whose system spec is minimum of 20dB. The antenna patterns are shown with and without FEM.

• 전기학회논문지
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• 제65권1호
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• pp.112-115
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• 2016

This paper demonstrates a scalp-implantable miniaturized antenna at the medical implant communication service (MICS) (402-405MHz) band. The antenna size is only $27.63mm^3$($8.5mm{\times}6.5mm{\times}0.5mm$), which is the smallest antenna for the MICS band. Miniaturization is achieved by using a symmetrical serpentine shaped radiating patch and placing open-end slots in the ground plane. In addition, co-axial feeding is used for excitation with a shorting pin connected between the radiator and ground. The antenna was simulated in a homogeneous skin model and in the human scalp. An experimental prototype of the proposed antenna was fabricated and measured in a skin-mimicking gel. Good agreement was obtained between the measurement and simulation results, showing a broad bandwidth of 49 MHz (from 395 to 444 MHz) for |S11| less than -10 dB and a maximum gain of -42.87 dBi. This gain is higher than the previous MICS antenna with respect to antenna size.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
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• pp.506-510
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• 2003

In this paper, a meander-line chip antenna with stacked layer is suggested, designed and fabricated employing the LTCC(Low Temperature Co-fired Ceramic) fabrication techniques. To reduce the antenna chip size, the meander-line antenna strip is distributed over three layer. Layers one interconnected using via holes. A 2.4 GHz chip antenna with size of $3.75{\times}7.9{\times}1.0 mm^3$ is designed and fabricated using the LTCC technique. Measurements of the fabricated antenna show 160 MHz bandwidth and 3.75 dBi maximum gain. The Measured reflection coefficient and radiation patterns agree well with the prediction by electromagnetic simulation.

• 전기학회논문지
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• 제58권12호
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• pp.2468-2473
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• 2009

In this paper, a quadrafilar antenna is designed to have a lower profile as an essential part of the size reduction technique and lower backradiation(namely, higher forward radiation) for the S-band telemetry/telecommand(TM/TC) function of a communication satellite. Particularly, to meet the challenging requirements on the higher isolation between the TM/TC antennas and simultaneously a smaller size, the lowest backradiation and lowest cross-polarization, the optimal physical dimensions of the quadrafilar antenna are found by using the Genetic Algorithm(GA). To prove the validity of the proposed antenna design, its 3D electromagnetic analysis and measured results are compared to show good agreement. Using this antenna as the elements, an array antenna is made to have directivity.

• 한국전자파학회논문지
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• 제13권7호
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• pp.687-692
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• 2002

본 논문에서는 중심주파수가 5.8 GHz에서 동작하는 새로운 급전구조를 갖는 광대역 마이크로스트립 패치 안테나를 설계 및 제작하였다. 제안된 새로운 급전구조인 마이크로스트립 라인-프로브 급전구조는 광대역 특성을 가지며, 안테나의 패치 크기를 줄일 수 있다. 광대역 특성을 확인하기 위해 기존의 프로브 급전 마이크로스트립 패치 안테나와 비교하였으며, 그 결과 대역폭은 34.5 % 증가하였으며, 패치의 크기는 45 % 축소되었다.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
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• pp.464-467
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• 2003

In this paper, to reduce the patch size of microstrip antenna, folded surface-type patch antenna is designed and fabricated. Size reduction could be achieved because of the downed resonant frequency by the extended current path passing along below the transformated patch surface. Comparison of the patch size at the 1.575 GHz between plane type(length 82 mm${\times}$width 90 mm) and "ㄷ"-shaped folded type is carried and comparision of frequency variation at the same patch size is carried. The result is like that the patch size was reduced than the plane type by 60 mm(73.17 %) at the same frequency. Therefore, it could be checked that "ㄷ"-shaped folded type antenna is advantageous than the plane type in size reduction.

• 한국전자파학회논문지
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• 제13권8호
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• pp.769-776
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• 2002

본 논문에서는 균일한 슬롯 폭을 갖는 5 GHz 대역 보우타이 형태의 미앤더 슬롯 안테나를 제안한다. 보우타이 슬롯안테나는 광대역 특성을 갖는 반면 크기가 크다는 단점이 있고, 미앤더 슬롯 안테나는 소형이지만 대역폭이 좁다. 그러므로 광대역 특성을 갖는 소형 안테나의 개발을 위하여, 일반적인 형태의 미앤더 슬롯을 보우타이 형태로 변화시켰다. 모의실험결과, 제안된 안테나는 같은 슬롯 폭과 슬롯 길이를 갖는 미앤더 슬롯 안테나보다는 대역폭이 3배정도 넓고, 같은 크기를 갖는 보우타이 슬롯 안테나보다는 공진 주파수가 3.01 GHz낮아짐을 볼 수 있었으며, 측정결과, 제안된 안테나는 소형이지만, 대역폭이 218 MHz(5.142 GHZ - 5.360 GHz)로써 원하는 동작 주파수(5.15 GHz - 5.35 GHz)를 만족한다.

• 한국ITS학회 논문지
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• 제5권1호
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• pp.65-70
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• 2006

본 논문에서는 금속 물질에 부착 가능한 UHF 대역 RFID(Radio Frequency Identification) 수동형 태그 안테나를 제안하였다. 제안된 태그 안테나는 일반적인 PIFA(Planar Inverted-F Antenna), IFA(Inverted-F Antenna)형태의 안테나를 갖는 태그보다 부착 되는 금속 물질 크기에 상당히 둔감한 특성을 나타내었다. 안테나의 구조는 멀티 층(multi layer)을 구성하였고, "L"자 슬릿을 추가 하여 방사 패치의 크기를 줄였다. 제안된 태그 안테나의 분석을 위해 HFSS 시뮬레이션 툴(tool)을 사용 하였으며, 후방산란(back-scattering)방법을 이용하여 측정하였다. 시뮬레이션과 측정은 금속 물질 크기를 변화시키면서 태그 안테나의 성능을 확인하였다.