STUDY OF ELLPITICAL SLOT UWB ANTENNAS WITH A 5.0--6.0 GHz BAND-NOTCH CAPABILITY

Two microstrip fed ultra-wideband (UWB) antennas with difierent band rejection techniques are presented in this paper. The designed antennas consist of a defected ground plane with an elliptical slot and two difierent radiator shapes. The flrst design is composed of a half circular ring radiator element while the second one uses a crescent shaped radiator. The radiators are fed by a 50› microstrip line with a tapered microstrip transition to ensure good impedance matching. The calculated impedance bandwidth of the proposed antenna ranges from 3GHz to 14GHz with relatively stable radiation patterns. To achieve band-notch characteristic in the 5.0{6.0GHz WLAN frequency band, two difierent techniques have been implemented. The flrst technique uses a C-shaped slot etched in the ground plane while the other one uses another C-shaped slot in the feed line.