volume | PIER Journals

Abstract

This paper presents a switched-beam antenna using circumferential-slot on a concentric sectoral cylindrical cavity excited by coupling slots to operate at 5.8 GHz. The advantages of this antenna are conformal structure, high directivity and capable of switched-beam pattern in six directions. The antenna design starts from a single sector which is capable of switching between radiating and non-radiating modes. The L-shaped coupling slots are proposed to accommodate the switching circuit. Each RF switch is made of two PIN diodes connected in a reverse series connection and placed across the slot at the appropriate location. Subsequently, the exciting probe is designed for matching TM₀₁ mode of the circular waveguide. The measured results of the proposed antenna give a gain of 7 dBi and |S₁₁| less than -20 dB at 5.8 GHz. This antenna is suitable for base station applications that require the switched-beam pattern in the azimuthal plane.

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Dr. Phairote Wounchoum

Dr. Denchai Worasawate

Dr. Chuwong Phongcharoenpanich

Prof. Monai Krairiksh