International Symposium on Antennas and Propagation
Wideband Sectored Antennas using CPW-fed Slot with Shaping the Reflectors
Sarawuth Chaimool, Prayoot Akkaraekthalin, Monai Krairiksh,
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Recently, high speed wireless data transmission is demanded. The degradation of transmission quality caused by multipath propagation often becomes a serious problem in such system. The sectored antenna is one of the techniques to compensate this degradation of the transmission quality, which leads to higher data transmission rate. The coverage sectorization via the utilization of directional antennas potentially increases system capacity of wireless communications. Pattern shaping of the base station antenna can yield benefits in controlling interference but it is not the dominant factor in determining the cell shape. So far, various kinds of sectored antennas have been proposed and developed, but most of these antennas have complex structures -. The use of Yagi antenna with microstrip patch elements was proposed for use in mobile terminals in . In , an antenna based on slot Yagi-Uda array was studied. For some applications of the sectored antennas, it is desirable to be able to adjust the beamwidth of the radiation characteristic. This paper proposes that a variable beamwidth antenna can be achieved by making a shaped reflector. The design examples of wideband antennas with the H-plane half-power beamwidths of 72?, 90? and 120?, suitable for 5 sectors, 4 sectors and 3 sectors, respectively, are shown.