The effect of the substrate structure on the radiation properties of microstrip array feed networks is investigated with the space-domain integral equation approach. Numerical and analytical techniques are employed to produce efficient computer algorithms. Results for space and surface wave losses are presented for corner discontinuities printed on substrate/superstrate, and two-layer substrate structures. Comparisons are made with the single-layer case.
Peer Reviewed
http://deepblue.lib.umich.edu/bitstream/2027.42/50412/1/1660040103_ftp.pdf