An Ultra-wideband Antenna with Single Band and Dual Band Elimination Characteristics

New efficient and accurate analytic models of ultra-wideband (UWB) microstrip antennas are introduced to design small printed parabolic shape monopoles with single and dual band notch antennas shaped with rectangular cavities and corrugated edges for wireless applications. Two UWB antennas are made with a parabolic shape radiator by using FR4 substrate (3.5 -14.25 GHz) and making half circular patch with four semicircle slots cut at the edges of the radiator (3.5-13 GHz). Single notch is designed by making a plus shape cavity ( 5-7.5 GHz), with a C shape at the end of arms of the plus sign cavity( 6.5-7.3 GHz), double parabolic cut at edges of cavity(6.1-7.1 GHz), double parabolic cut at edges of cavity with parabolic cavities at both ends of monopole radiator (6.1-7.5 GHz), by etching a thin line cavity (5.1-6.2 GHz) and inverted C shape cavity (3.1-4 GHz). These single-notch antennas are used to cut C Bands and Satellite downlinks X bands. Dual notch bands are also achieved by including a thin rectangular cavity and inverted C-shaped cavity (3.4-4 GHz and 4.8 – 5.9GHz). Band notch characteristics are also designed to eliminate interference with existing bands of Wi-Max and WLAN. A dual-band notch antenna is fabricated and tested for S parameters, VSWR. The designs are applicable in short-range, high-data speed wireless within the frequency band from (3.1 to 13 GHz and 3.5 to 14.25 GHz). These microstrip antennas along with single and dual band-notch in UWB systems are also compact with multifunctional features reducing the number of antennae in wireless devices. Also useful in wireless networks having a wide radiation pattern and in biomedical diagnosis. These antennas are lightweight, and robust and also give low cost of production.