A New Impedance Model for Differentially-fed Proximity-Coupled Microstrip Patch Antennas

This work provides a new analytical model to estimate the impedance response of proximity-coupled microstrip patch antennas excited with a differential feed network. The proposed model has been validated in S- and X-bands. Results show high accuracy estimation of the impedance response over a wide range of frequencies in both bands. This contribution enables analytical modeling of differentially-fed microstrip patch antennas that can be used in radar and communication systems that requires large bandwidth and high polarization purity.