Input Impedance Variation of Coax and Microstrip-line Fed Microstrip Antenna on Ferrite Substrates

Abstract

Modal expansion technique used to determine the input impedance of microstrip antenna on dielectric substrate has, in the modified form, been employed to establish an exact relation between the input impedance of microstrip antenna on a ferrite substrate and the feed point variation both for coax and microstrip line feeding. A ready- made technique is also suggested to find out the input impedance of ferrite based microstrip antennas.