Characterization of Compact Ovoidal Printed Antenna with Windowed Groundplane

This paper deals with the bandwidth enhancement of a compact printed antenna with an ovoidal patch incorporated with an ovoidal window on its groundplane. A relative position of the sharp-end of the ovoidal patch to the windowed groundplane is altered to investigate its influence to the bandwidth response. The original ovoidal patch was rotated in 180
^o
, followed by rotating the ovoidal windowed groundplane. This reciprocal position improves the antenna performance where the bandwidth percentage increases up to approximately 49%. The fabricated antenna works at the frequency range of 3.20–19.62 GHz or with the bandwidth percentage of 207%. The measured radiation patterns at the frequencies of 4 GHz, 8 GHz, and 17 GHz show good agreements with the simulated ones. This configuration has provided a maximum gain of 7.98 dBi at the frequency of 11 GHz.