Comparison of Patch Antenna with Different Parameters using Instant and Edge Feeding

In most of the microstrip patch antennas the feed line impedance is 50Ω whereas the radiation resistance at the edge of the patch is on the order of a few hundred ohms depending on the patch dimension and the substrate used. The performance of the antenna is affected due to this mismatch since the maximum power is not being transmitted. A matching network must therefore be implemented on the feed network, in order to minimise reflections, thereby enhancing the performance of the antenna.