A rectangular microstrip patch on a composite substrate is theoretically and experimentally investigated. Considerably wide radiation beamwidth along with high gain is experimentally demonstrated. Compared to a conventional microstrip patch, the proposed configuration shows as much as 75% increment in beam width in its H-plane and nearly 10% in E-plane, indicating the peak gain of the order of 8 dBi.
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Chattopadhyay et al. (2009) studied this question.
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