A CPW-fed Rhombic Antenna with Bandreject Characteristics for UWB Applications

摘要

In this design, a novel rhombic CPW-feed antenna is presented to achieve broadband operation. The antenna has dimensions of 28.5 × 17.0 × 0.8 mm and has good radiation characteristics. The proposed antenna uses a coplanar waveguide feed line with a rhombic radiation patch to cover the frequency band limited by the Federal Communications Commission (FCC) for the ultra-wideband (UWB) standard. The fabricated antenna achieved a -10 dB impedance bandwidth covering from 3.1 to 11.9 GHz (approximately 117 percent). However, the frequency band from 5.15 to 5.825 GHz is used in the IEEE 802.11a standard and HIPERLAN/2. A straight slit, embedded in one of the symmetrical ground plane, plays the role of a filter to eliminate the unwanted band. The effects of varying the location and length of the slit and the structure of the ground and monopole patch on the antenna performance have also been studied.