Performance enhancement of microstrip patch antennas for WLAN applications

Abstract

This work covers two aspects of the microwave technology. The first is analysis and design of single band Microstrip Antenna with low back lobe level and improved FBR and second is analysis and design of Multiband Microstrip Antenna with low back lobe level and improved FBR. Effect of with and without partial ground with edge shaping on FBR is compared in the report. Another method of fractal ground plane is developed in the work to reduce back radiations. This method is most suitable for fabrication purpose and also gives miniaturized antenna. Method of corrugated dielectric reflector is also proposed in this work. Corrugations help reducing the back lobe level. Concept of metal reflector is also used to reflect back radiations in front direction and improve FBR. Work also involves back lobe reduction using two thick dielectric reflectors at the back side of the antenna of an inset feed single band and a multiband antenna. Inset feed line provides improved bandwidth and much better return loss. Maximum improvement in back lobe and FBR of is achieved by the method of partial ground plane with edge shaping. Fabrication of MSA with double back reflector is also done as well as the testing is done using VNA model no. MS46322A. Tested results along with the comparison with simulated results are also shown.