Bandwidth enhancement of microstrip patch antenna for 5.8GHz by optimized feed offset

Patch antennas always find a better match in embedded applications because of their ease of fabrication, small size etc. With embedded systems becoming mobile, narrow bandwidth of patch antennas are a major bottle neck in their usage in mobile embedded applications. Here we propose a method for improving the bandwidth of the patch antenna by optimizing the feed offset position. In this paper a rectangular microstrip patch antenna operating at 5.8GHz with bandwidth enhanced by 54 percent from 260 MHz to 400 MHz by optimizing the feed position, but with a slight trade-off in gain is reported. While the return loss remains almost same at -17.5 dB and -17 dB respectively, gain and directivity are slightly reduced from 7.18dB and 7.23dB to 5.17 dB and 5.24 dB. The antenna is fabricated using RT-Duroid substrate that has low dielectric constant and loss tangent.