• Journal of electromagnetic engineering and science
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• 제2권1호
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• pp.28-33
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• 2002

The LHCP circularly polarized antenna operating at DBS band is developed by employing the sequential-rotation technique in which each subarray is comprised the three truncated-corner patch square element. Antenna designed with sequentially-related technique whose M=3, p=2 has the effect of improved axial-ratio bandwidth, cross-polarization etc. And it is proved that the degradation of radiation pattern can be reduced significantly by minimizing the radiation loss of feeding line structure. Antenna designed shows extremely low side lobe level of below - 25 dB in the diagonal plane and cross-polarization level of below -20 dB in the all plane. And these performances comply with the array antenna specification for DBS.

• 대한전자공학회논문지
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• 제27권6호
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• pp.829-835
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• 1990

We proposed a new radiating structure generating a circularly polarized wave. Futhermore, we show that it is possible to generate all kind of polarizations by simple variations of some schematic factors. Basically, the structure composed of a slot and a strip. The length of slot and strip, the slot-strip distance and the strip inclination are the crucial factors to determine the polarization form. In this paper, we investigated the effects on polarization and other radiation characteristics by varying the factors.

• ETRI Journal
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• 제34권5호
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• pp.767-770
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• 2012

This letter presents a novel compact circularly polarized patch antenna for Global Positioning System/Global Navigation Satellite System (GPS/GLONASS) applications. The proposed antenna is composed of a simple square radiating patch fed by a capacitive dual-feeder to increase the impedance bandwidth and a lumped element hybrid coupler to achieve the broadband characteristic of the axial ratio (AR). The realized antenna dimensions are $28mm{\times}28mm{\times}4mm$, which is the most compact size among the dual-band GPS/GLONASS antennas reported to date. The measured results demonstrate that the proposed antenna has a gain of 2.5 dBi to 4.2 dBi and an AR of 0.41 dB to 1.51 dB over the GPS/GLONASS L1 band (1.575 GHz to 1.61 GHz).

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
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• pp.418-422
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• 2003

In this paper a dual-band circularly polarized stacked microstrip antenna for Global Positioning System (GPS) service and Digital Multimedia Broadcasting (DMB) service is designed. By stacking two different corner-truncated square microstrip patches, dual-band, dual polarization characteristic is obtained. Experimental results show impedance bandwidth of 60 MHz (3.8%) and axial ratio bandwidth of 6 MHz (0.4%) in GPS and impedance bandwidth of 126 MHz (4.7%) and axial ratio bandwidth of 30MHz (1.1%) in DMB.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 춘계학술대회
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• pp.51-52
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• 2013

본 논문에서는 메타구조의 공진기를 이용하여 3.5GHz의 중심주파수를 갖는 S-대역용 원형편파 마이크로 스트립 안테나를 연구하였다. 설계된 안테나는 CST studio를 이용해 패치안테나를 설계한 후 소형화를 위하여 그라운드면에 메타구조의 공진기를 식각하였으며 slot을 사용하여 원형 편파를 구현하였다.

• 한국전자파학회논문지
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• 제11권4호
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• pp.642-648
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• 2000

유전자 앨거리즘을 이용하여 동축선 급전 원형 편파 사각 마이크로스트립 안테나를 설계하였다. 임피던스 및 유효 손실 탄젠트 그리고 축비 등을 포함하는 복잡한 목적 함수를 갖는 마이크로스트립 안테나 설계에 유전자 앨거리즘이 효과적임을 보였다. 패버티 마들로부터 입력 임피던스와 원형 편파의 축비를 유도하고, 안테나의 폭과 길이와 동축선 급전점을 유전자 앨거리즘을 이용하여 최적화 하였다. 설계된 안테나를 제작하고 시뮬레이션 결과와 비교하여 타당성을 검증하였다.

• ETRI Journal
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• 제36권6호
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• pp.889-893
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• 2014

This paper presents a high-performance dual-circularly polarized feed employing a dielectric-filled circular waveguide. Novel features are incorporated in the proposed feed, such as a dielectric rod radiator for high gain and good impedance matching; dual quarter-wave chokes for low axial ratio over wide angles and for low back radiation; an integrated septum polarizer; and two end-launch-type coaxial-to-waveguide transitions. The proposed feed shows excellent performance at 5.0 GHz to 5.2 GHz.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2007년도 하계종합학술대회 논문집
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• pp.337-338
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• 2007

The present paper proposes the method which improves a record and remaking efficiency of the optical pickup as applying the mirror where Phase Shift(PS) principle is applied to optical pickup. Plan to get a circularly polarized light quality above quality which is embodied through Existing Quater Wave Plate(QWP) and a function of total reflection mirror as applying PS mirror which integrates QWP with the function of the total reflection to optical pickup. In the present paper, embody circularly polarized light quality through applying PS mirror to optical pickup, and it through, plan to propose to come true the optimization of recording and remaking CD/DVD disc.

• 한국광학회지
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• 제2권2호
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• pp.74-82
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• 1991

서로 마주보며 비춰진 원형편극된 두 $TEM_{00}$ 레이저 광속내에 부양된 균질구에 작용하는 광압분포를 조사하였다. 두 레이저 광속의 간섭효과를 고려하여 광압성분의 해석적 표현이 유도되었으며 정상 평면전자기파의 경우와 비교되었다. 광압분포에 대한 수치해석 결과가 제공되었으며 그 물리적 의미가 논의되었다.

• Journal of electromagnetic engineering and science
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• 제12권2호
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• pp.155-160
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• 2012

A wideband circularly polarized pinwheel-shaped planar monopole antenna fed by a wideband feeding network is presented in this paper. The proposed antenna is formed by four wideband planar monopole antenna elements with aquadruple feeding network in order to improve the performance of circular polarization. Additionally, the antenna, which is introduced here, has a high gain in the z axis direction because of its folded antenna structure. The attractive characteristics of the proposed antenna are the wide impedance bandwidth of 87.3 % (1 GHz to 2.55 GHz), the 3 dB axial ratio (AR) bandwidth of 92.3 % (1.05 GHz to 2.85 GHz), and the maximum gain within the 3 dB AR bandwidth is about 8.24 dBic.