ON THE YIG FILM WAVE-GUIDES

This paper investigates a new type of microstrip line on pair of Yttrium Iron Garnet films grown on both sides of Gadolinium Gallium Garnet substrate and sandwiched between two dielectric slabs. Transmission characteristics of the line show coupling phenomena between quasi TEM and magnetostatic surface wave modes. A sharp notch characteristic is observed experimentally with half-power bandwidth of 11.8 MHz and maximum attenuation 20 dB at 6.95 GHz for 13.5-mu-m thick films. Alternatively, in the same line with an air gap band-pass characteristic is observed with quality factor of 1000 and insertion loss of 10 dB at 6.5 GHz.