Even Mode Network Model for Multi-band and Compact Modified Rectangular Microstrip Antennas

The multi-port network model is a simpler tool to analyze microstrip antennas on thinner substrates. While analyzing modified shaped microstrip antennas, the multi-port network model consists of larger number of segments which increases the complexity of the model. In this paper, first multi-port network models of multi-band and compact modified rectangular microstrip antennas are discussed. Further by using the symmetry of multi-port network models, a simpler even mode network equivalent model is proposed. The even mode network model solves only half of the network and thereby reduces the complexity of the multi-port network model. It gives closer match with multi-port network model result in terms of resonance frequency, input impedance and voltage distribution.