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 without reflector electrodes is realized. In this paper, using the responses exited by a weighted interdigital transducer (IDT) and generated by the 2N/spl plusmn/2th mode's complete reflections at free edges of a ceramic substrate, we realized a new type of BGS resonator having resonances without reflector electrodes. This resonator showed sufficient trap attenuations for practical use at both adjacent picture carrier frequency (f/sub ap/) and adjacent sound carrier one (f/sub as/) in the TV and VCR video intermediate frequency (VIF) circuit.