L-band low loss SAW filters

Conventional and low loss surface acoustic wave (SAW) filters have been used in a number of system applications from radar to communications, to television tuners. The frequency range for low loss SAW filters has been 30 MHz to 440 MHz. L-band SAW devices can be manufactured using higher resolution fabrication techniques such as E-beam mask making and group-type unidirectional transducer design. Results of a 961 MHz group-type unidirectional fabricated on lithium niobate are presented along with theoretical results. Results of a 250 MHz group-type prototype device are presented along with the series tuned matching technique developed by Malocha (1979).