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Two-Arm Microstrip Spiral Antenna with a Circular Slot on the Ground Plane  

오대영 (아주대학교 전자공학부)
김명기 (아주대학교 전자공학부)
박익모 (아주대학교 전자공학부)
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Abstract
In this paper a novel two-arm microstrip spiral antenna with a circular slot on the ground plane is presented. The proposed antenna structure is constructed in a planar form without a balun circuit and the radiation characteristics of conventional and eccentric spiral antennas are obtained simultaneously. The main beam direction is normal to the plane of the spiral for characteristic frequency band and the direction of the main beam moves linearly into $\theta$ and $\phi$ direction as the frequency increases.
Keywords
spiral antenna; microstrip antenna;
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