Abstract
Wideband design of E-shape microstrip antenna is discussed, which yields bandwidth of 213 MHz (19.42%) on the substrate of thickness 0.06λ0. Further enhancement in E-shape antenna bandwidth is obtained by embedding pairs of rectangular slots on the ground plane. A detailed study explaining the effect of slots on the resonant modes of the patch and modified ground plane, in yielding wideband response, is presented. The E-shape patch backed by single pair of slots cut ground plane yields BW of 233 MHz (21.4%) whereas that with two pairs of slots on the ground plane, bandwidth of 318 MHz (28.12%) is obtained, which is nearly 10% more as compared to the bandwidth obtained from E-shape patch. The antenna with two pairs of slots on the ground plane yields broadside radiation pattern across the complete bandwidth with peak broadside gain of more than 7 dBi.
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