Abstract
Wideband designs of unequal lengths slot cut rectangular microstrip antennas backed by slots cut ground plane are proposed. The slots in ground plane (GP) alter TM02 and TM11 mode frequencies of equivalent GP, whereas additional slots on rectangular patch alter its TM11, TM02 and TM12 mode frequencies, and an optimum spacing between them results in wider bandwidth. Maximum impedance bandwidth of 579 MHz (>50%) is obtained with unequal slot lengths on the GP as well as the radiating rectangular patch. All the slot cut designs yield broadside radiation across the impedance bandwidth and exhibit elliptical polarization. Peak broadside gain of larger than 7 dBi is obtained in the optimum configuration.
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