Beam Steerable Dipole Antenna Using Varactor Diodes for WiMAX Application

This paper presents a beam-steerable dipole antenna using varactor diodes for WiMAX applications. The proposed antenna consists of dipole antenna, two parasitic elements, and varactor diodes. To realize a beam steering feature, varactor diodes are inserted in parasitic elements, which makes the electrical length of the parasitic elements change by adjusting the bias voltage. The proposed antenna can cover wide area in both elevation and azimuth plane by using beam steering feature. For validation of the proposed antenna, simulations were conducted, and the antenna was fabricated and measured.