A BLEUSTEIN-GULYAEV-SHIMIZU WAVE RESONATOR HAVING RESONANCES FOR TV AND VCR TRAPS

A Bleustein-Gulyaev-Shimizu (BGS) wave has only a shear horizontal (SH ) wave showing a complete reflection at a free edge of a substrate, By utilizing this property, a small BGS resonator having one resonance w ithout reflector electrodes is realized, In this paper, using the resp onses exited by a weighted interdigital transducer (IDT) and generated by the 2N+/-2th mode's complete reflections at free edges of a cerami c substrate, we realized a new type of BGS resonator having resonances without reflector electrodes, This resonator showed sufficient trap a ttenuations for practical use at both adjacent picture carrier frequen cy (f(ap)) and adjacent sound carrier one (f(as)) in the TV and VCR vi deo intermediate frequency (VIF) circuit.