| Abstract |
The development of the high data rate wireless communication systems, has placed significant demands on antenna designers, in particular, the requirement for smaller elements with broader bandwidths. In recent years, ultrawide band (UWB) antennas have received increased attention. Planar UWB monopole antennas with rectangular, circular, elliptical and triangular shapes patch have been reported. It is also necessary for UWB systems to minimize in-band interference effects, within the UWB band (3.1GHz-10.6GHz). In particular, the growth of IEEE 802.11a wireless LAN in the the frequency-band 5.15GHz-5.825GHz, has increased.. Therefore, antennas providing reject notch function are becoming necessary. Recently, some antennas with notch-band function have been discussed. In this paper, a novel UWB antenna with notch-band frequency is studied. Effects of the various parameters for antenna performances are also discussed. An optimized compact UWB antenna with notch-frequency function is fabricated and experimentally examined. The measured results show the proposed UWB antenna can achieve a return loss greater than 10db over an ultrawide bandwidth, of 9.8GHz, from 2.97GHz to 12.77GHz with a tunable notch-frequency band of 5.15GHz to 5.825GHz. |
