Abstract
This paper describes the application of res- onant single-phase unidirectional transducers (RSPUDTs) to the development of low-loss SAW filters with constant group delay in transition bands as well as in the passband. A low-loss SAW filter with constant group delay was de- signed and fabricated on a 128 YX-LiNbO3 substrate. Ex- perimental results were in good agreement with the design; the group delay deviation of 20 ns was realized over the range of 8 MHz at the center frequency of 512 MHz. The minimum insertion loss and 3 dB bandwidth were 4.3 dB and 8.5 MHz, respectively. The application of this technique is also extended to develop high-performance wideband fil- ters employing quasi-slanted interdigital transducers.
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