Abstract
Conventional method of beam scanning such as phased array antenna is costly by using multiple antenna elements and phase shifters. In this communication, a different method is investigated to achieve beam scanning. A multimode concentric circular microstrip patch antenna on a single substrate layer backed by a finite ground plane is presented where radiation patterns are reconfigurable. Pattern reconfiguration is achieved by exciting higher order TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n1</sub> modes in addition to the dominant TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> mode. Next, limited beam scan performance for linear polarization by employing mode combination and control of the amplitude and phase values is demonstrated. A prototype multimode patch antenna was fabricated and experimentally verified for the individual modes impedance matching and radiation patterns which showed acceptable agreement. The beam scan performance for a selected combination of modes of the patch was also measured.
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