Effect of substrate thickness and permittivity on the characteristics of rectangular microstrip antenna

The most important factors in design of microstrip circuit and antenna are choice of the best substrate thickness and the dielectric constant to have low losses. Most of the work on microstrip antenna in the past, employed electrically thin and low permittivity substrates. In this case an attempt has been made by selecting various dielectric constants and thicknesses to study various parameters. For this, a rectangular microstrip antenna (RMSA) is designed in X-band at 9.2 GHz and fabricated on different substrates ranging dielectric constant between 2.20 to 10.20 and thickness ranging 0.635 mm to 1.574 mm. The return loss of of the order of -43 dB is also observed at the designed frequency. The bandwidth in between 4% to 20% was observed.