Wideband Modified Shorted Rectangular Patch Antenna Using L-shape Feed

In the days of miniaturization, compact antennas which are conformal to the hosting surface are widely used. Due to various advantages, shorted microstrip antenna variation, a planar inverted F-antenna with modifications have been widely referred. In this paper detailed study into functioning of planar inverted shorted microstrip antenna employed with modified L-shape feed is presented. It has been shown here that wider bandwidth is result of optimum spacing of TM1/4,0 mode with reference to next higher order degenerated TM3/4,0 modes as well as optimization of impedance at them using the modified feed. A modified variation of similar configuration with increased feeding length is presented which yields impedance bandwidth of 7.3 GHz (>95%) which is 40% additional as compared with the reported design. Parametric design guidelines are presented for shorted modified antenna which will provide design methodology for realizing similar antenna at different frequency.