Abstract
A quasi Yagi antenna is presented that provides off-axis radiation when backed by a metal reflector. The off-axis radiation pattern is achieved by an increase in the substrate thickness beneath the antenna elements. At 2.4 GHz the antenna demonstrated a bandwidth of 190 MHz, beam tilt towards the end fire direction (thetas = 42 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">deg</sup> ) , maximum gain of 4.5 dB, and a radiation efficiency of 87%. The results of a study on bandwidth, gain and radiation pattern versus substrate thickness are presented herein. To the best of the authors' knowledge previous realization of this antenna over a ground plane has not been investigated.
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