FEUDT periodic cell with different width electrodes

A periodic cell of the floating electrode unidirectional SAW transducer (FEUDT) in the general case of electrodes of finite thickness and of different width is investigated. The important parameter of unidirectionality as a phase shift between reflection and transduction centers is calculated. In contrast to the regular case of equal width electrodes and gaps, one can see a lot of possibilities to reach the optimal phase shift 45/spl deg/.