The effect of substrate dispersion on the operation of square microstrip antennas

The effect of dispersive substrates upon the operation of microstrip antennas is evaluated with a simple and efficient finite-difference time-domain technique. Two single-feed corner-truncated patches with Debye-modeled substrates are simulated; the reflection coefficient and the input impedance are calculated and compared with the lossless case demonstrating that mainly the input impedance and slightly the resonant frequencies are influenced. An unsplit perfectly matched layer is also proposed for the termination of computational domains with dispersive media.