컨포멀 배열에 적용할 수 있는 곡선 배열안테나용
AbstractWe propose a design method of a Rotman lens for curved array antenna applicable to conformal array. In this paper, design equations are derived to obtain an array curve, transmission line lengths of a Rotman lens in conjunction with a curved array antenna, and the phase error of a Rotman lens based on these design equations is minimized through the beam curve optimization procedure and the refocusing procedure. Rotman lenses designed by the proposed design equations and design procedures still maintain 3 focal points, can feed a convex or concave array antenna with circular curve, parabolic curve, V-shaped curve, etc as well as a straight line array antenna, and have minimal phase error. . Rotman 렌즈는 Rotman과 Turner에 의해 설계식이 제시된 이래 [3] , 광각 스 캔이 가능하고, 주파수에 무관하게 빔을 조향할 수 있고, 몇 개의 렌즈가 적층되면 이차원 빔을 생성할 수 있으며, 저비용 및 소형으로 제작할 수 있어 배열안테나를 급전 하는 빔 형성 회로망(beam forming network)으로 널리 활 용되고 있다[4], [5] . 따라서 Rotman 렌즈 급전 컨포멀 배열 안테나는 성장․발전 가능성이 높은 기술이다.
An all-metal, broadband, dual-polarized Vivaldi array antenna was designed and fabricated. The structure of the proposed antenna comprised a resonant cavity and tapered fins that contacted the ground plane directly, allowing the connection of a balun and tapered fins and reducing the antenna length. To extend the frequency range, the resonant cavity width is larger than half the aperture length, and the tapered fins have nonuniform thickness. The proposed Vivaldi array antenna is designed based on parametric studies. The gains of the active element and array ranged from -2.9 dBi to 6.4 dBi and 14.9 to 23.5 dBi in the frequency range of 2–6 GHz. The proposed array antenna exhibited beam steering capability up to 45° along the azimuth and 25° along the elevation angle directions. Since the measured results and simulated predictions were in good agreement, the proposed array antenna would be applicable for a broadband, wide-beam steering system with different polarization requirements.
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