Abstract
AM, FM, TDMB, GPS 수신용 자동차 전장 안테나를 설계하고 이를 제작하였다. AM 안테나는 페라이트 턴스타일 안테나로 설계하여 전방향 특성을 갖도록 하였다. FM, TDMB 수신용으로는 헤리컬 소자를 접은 접힌 모노폴 안테나로 설계하였다. 대역 확보를 위한 GPS 수신 안테나는 공기층 사다리꼴 마이크로스트립 패치 안테나로 설계하였다. 제작된 AM 수신용 안테나의 수신 신호 세기는 -65.7 dBm으로 기존의 외장형 폴 안테나의 -63.5 dBm과 비교하면 소형이면서도 유사한 수신 성능을 나타냄으로써 외장형 폴 안테나 및 glass 안테나 대체 품으로 적용할 수 있음을 보였다. FM 및 TDMB 수신 신호 세기는 각각의 중심 주파수에서 -55.66 dBm, -43.50 dBm 측정됨으로써 기존 안테나에 비해 5~10 dB 높은 특성이 나타났다. GPS 안테나에 대한 측정은 VSWR 2 : 1 기준으로 135 MHz의 넓은 대역 특성과 4.31 dBi의 이득이 측정되어, GPS 전 대역에서 일반 세라믹 패치 안테나의 이득보다 3~5 dB 높은 이득을 얻었다. A vehicle antenna for AM, FM, TDMB, GPS systems was designed and implemented. Omnidirectional AM antenna was designed by ferrite turn style antenna. For the FM and TDMB antenna, folded monopole antenna which helical is folded was applied. GPS antenna for the bandwidth achievement was designed by trapezoidal microstrip patch that has air substrate. Receiving signal strengths by the measurement were presented for the AM, FM and TDMB antenna. AM signal strength was -65.7 dBm, this strength is almost as same conventional pole antenna as -63.4 dBm. It can be replaced conventional pole or glass antenna by the studied antenna. Signal strengths for FM and TDMB were -55.66 and -43.50 dBm at center frequency, they are 5~10 dB higher than conventional antenna. Measurements of bandwidth and gain for the GPS antenna showed 135 MHz under VSWR 2 : 1 and 4.31 dBi, gains over GPS band were 3~5 dB higher than ceramic patch antenna.
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