A new planar array antenna with special beam shaping for ETCS-RSE (Electronic Toll Collection System-Road Side Equipment) is presented. The proposed 10x10 array antenna was obtained flat-topped radiation pattern by using Woodward and Lawson pattern synthesis. The measured electrical performances of the fabricated antenna in an operating band of 5.79 ~ 5.85 GHz showed VSWR of less than 1.72, antenna gain of more than 14.3dBi, and 3dB beam width of about 33 o , low side lobe level of more than 26dB outside of ±34 o .

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본 논문에서는 이중 급전 방식을 적용하여 높은 격리 특성을 갖는 초소형 ICS(Interference Cancellation System) 중계기용 안테나를 설계하고, 제작 및 측정을 통하여 이를 검증하였다. 대역폭과 이득은 주방사 패치 및 전력분 배기 근처의 스터브 길이, 그리고 기생 패치의 크기를 조정하여 최적하였다. 제작된 안테나는 3G 이동 통신 주파 수인 1,920～2,170 MHz 대역에서 VSWR 2:1 미만, 이득은 7 dBi 이상, 격리도는 -65 dB 미만의 특성을 나타내었다. AbstractIn this paper, a dual-fed small ICS repeater antenna with high isolation is designed, fabricated, and measured. Bandwidth and gain are optimized by changing the stub lengths near main patch and power divider, and also by changing the size of parasitic patch. To improve the isolation characteristic of the antenna, a dual-feeding method is applied in designing the antenna. The fabricated antenna has a VSWR less than 2, a gain over 7 dBi, and an isolation between the donor and the server antennas less than -65 dB from 1,920～2,170 MHz for 3G mobile communication.