• Journal of the Korea Institute of Information and Communication Engineering
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• v.6 no.3
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• pp.440-444
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• 2002

A microstrip patch antenna with circular polarization based on the Sierpinski fractal geometry is proposed. The Sierpinski fractal is composed of 3 equilaterial triangular patch and is easy to produce a circular polarization by sequentially rotation techniques. The characteristics of a 1x3 antenna array from Sierpinski geometry are investigated, i.e. port isolation and AR(axial Ratio).

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39A no.12
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• pp.774-776
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• 2014

In this paper, we propose a multiple dual-polarized antenna system for multi-user transmission in line-of-sight (LoS) dominant channel environments. By exploiting space and polarization resources efficiently, the proposed system achieves a higher sum rate than the existing multi-user multiple input multiple output (MU-MIMO) system with uni-polarized antennas.

• Journal of the Korea Society of Computer and Information
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• v.27 no.3
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• pp.71-77
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• 2022

In this paper, we propose 1×2 array antenna with dual linear polarization characteristics for mmWave band operation. The proposed antenna is designed two microstirp feeding structure and FR-4 substrate, which is thickness 0.4 mm, and the dielectric constant is 4.3. The size of 1×2 array antenna is 2.33 mm×2.33 mm, and total size of array antenna is 13.0 mm×6.90 mm. From the fabrication and measurement results, bandwidths of 1.13 GHz (28.52~29.65 GHz) for port 1 and 1.08 GHz (28.45~29.53 GHz) for port 2 were obtained based on the impedance bandwidth. Cross polarization ratios are obtained from 7.68 dBi to 16.90 dBi in case of vertical polarization, and from 7.46 dBi to 15.97 dBi in case of horizontal polarization for input port 1, respectively. Also, cross polarization ratios are obtained from 8.59 dBi to 13.72 dBi in case of vertical polarization and from 9.03 dB to 14.0 dB in case of horizontal polarization for input port 2, respectively.

• Proceedings of the KAIS Fall Conference
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• 2002.05a
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• pp.209-211
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• 2002

차량 탑재 FM 수신용 전 방향성 루프 안테나를 개발하였다. 2개의 수직 루프를 90도 교차하고, 1개의 수평 루프와 결합함으로써 전 방향 특성을 가질 수 있다. 또한 수직 및 수평편파 모두를 박기 때문에 도심 등 주위 환경변화에 따른 편파 다이버시티 현상도 제거한 수 있다. 10cm 직경의 19회 감긴 각 루프를 정합시키고 증폭하여, 90도 이상기와 함께 결합한 안테나를 개발하였다. FM 대역인 88-108MHz 대역에서 측정된 반사특성 및 패턴은 이론치와 잘 맞고 있으며, 기존 whip안테나 보다 평균 4dB 향상된 수신전력 특성을 보이고 있다.

• Journal of the Institute of Electronics Engineers of Korea TE
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• v.42 no.4
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• pp.63-68
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• 2005

In this paper, the single coaxial fed and circularly polarized patch antenna for the RFID system in 2.45GHz ISM band has been fabricated. The simulation by HFSS, electro-magnetic field simulator was executed in order to decide the location of feed which is difficult to be analysed. The simulated result has the same tendency as the measured one in the view of input impedance with the variation of feed location. VSWR of fabricated antenna is low($\leq$1.2) even in comparatively high dielectric loss epoxy substrate(FR4), and this value is enough for the application of RFID reader antenna.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.20 no.2
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• pp.72-78
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• 2021

This paper proposes a wide-band dual-polarization stacked patch array antenna for satellite SAR system applications. The array antenna was designed for loss minimization and wide-band characteristics to enhance the performance of the SAR system and optimize it for active return loss in applications to active phased arrays. The fabricated array antenna showed a performance of 19.26%/19.79% fractional bandwidth within the -10 dB reference level of the active return loss and showed loss characteristics of 0.797 dB/0.799 dB averaged within the operational frequency for both H/V-polarization cases. The pattern performance was verified by comparing the measured patterns with the calculated patterns obtained by the array factor.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.4
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• pp.817-821
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• 2001

In this paper, we design a microstrip patch antenna using 3-dimensional microstrip transition with the VSWR 1.3 over the PCS band (1.75 -1.87 GHz). We study experimentally the effect of the antenna parameters on antenna input impedance. And using the proposed antenna, we fabricate a polarization diversity any antenna and discuss the possibility of antenna for PCS base station.

• The Journal of the Korea institute of electronic communication sciences
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• v.5 no.6
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• pp.563-567
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• 2010

In this paper, circularly polarized micro-strip GPS of 1.57 GHz and DMB of 2.63~2.65GHz antenna have been studied. In order to improve of frequency properties, parameters such as patch size, corner truncated type, and feed positions were simulated using HFSS program. GPS and DMB antenna were fabricated and characteristics were measured using network analyzer.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2000.11a
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• pp.420-423
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• 2000

본 논문은 IMT-2000 기지국용 이중편파 ASSAP(Air-Strip-Air-Patch)형 마이크로스트립 안테나를 설계하였다. 복사소자로는 급전선과 복사부와의 고립도가 좋은 개구 결합형 패치를 이용하였다. $\pm$45$^{\circ}$직교 슬롯을 이용하여 이중편파를 발생시키고 급전선으로는 광대역화를 위한 에어 스트립라인을 이용하였으며 안테나의 복사특성을 만족하기 위해 패치의 크기와 접지면의 크기를 조정하여 Ensemble로 시뮬레이션 하였다. 그 결과 설계 제작한 안테나는 두 개의 포트 모두 전대역에 걸쳐 1.5:1 이하의 VSWR과 -25dB이하의 격리 특성, 그리고 65$^{\circ}$$\pm$ 7$^{\circ}$의 수평범폭을 갖는다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.51-52
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• 2013

In this paper, circularly polarized microstrip for the S-band with a center frequency of 3.5GHz have been studied using the meta-structure of the resonator Designed antenna using CST studio, the meta-structure resonator was etched in the ground plane for miniaturization and circulary polarization was implemented with slot in center of the patch.