INVESTIGATIONS ON COMPACT UWB MONOPOLE ANTENNA

The advances in integrated circuits resulted in drastic reduction in size of electronic gadgets. This necessitated miniature size antennas for use with wireless communication equipments. Many researchers have worked and are working on printed monopole slot antennas to achieve small size and acceptable performance. In this regard several investigations are carried out to ascertain the effect of slot position on antenna performance. In addition to this bevel slots are cut at corners and its effect on antenna performance is studied. Compact wideband antennas are gaining popularity in view of their features like large bandwidth, low power consumption, low complexity, low cost etc.. Many researches are working to obtain an optimum arrangement for the UWB monopole antenna. In this paper several configurations of wideband antennas are designed, tested and their performance is compared. One arrangement is a compact patch with slot cut at different locations. Another arrangement is the earlier one with two symmetrical bevel cuts on the lower edge of the radiating element. In both schemes a defective ground plane structure (DGS) is used. Further the ground plane dimensions are varied and effect of this on performance is studied. The design and performance evaluation is carried out using HFSS software. The results are presented and discussed.