BUKHARI, S.S. and WHITTOW, W.G., 2013. Heterogeneous substrate microstrip antenna with enhanced bandwidth. 2013 Loughborough Antennas & Propagation Conference (LAPC), 11th-12th November 2013, Loughborough University, pp. 213 - 216
A heterogeneous substrate is designed when the permittivity of a substrate is changed as a function of location. Due to non-uniformity of the electric fields in a patch, loading of different areas with heterogeneous dielectrics can change behavior. In this paper heterogeneous substrates are employed to increase the bandwidth of a patch by combining its first and second resonance.