A new low-loss SAW filter for an intermediate frequency (IF) circuit in a color TV receiver has been developed. It consists of an apodized bidirectional and an unapodized group-type unidirectional transducer. The unidirectional transducer is designed to use different numbers of finger pairs in sending and reflecting electrodes for extension of the impedance matching range. A thin-film capacitor as a phase shifter is monolithically fabricated on a 128° Y – X LiNbO3;., substrate. As a consequence, both a low insertion loss of 11.3 dB and impedance matching without adjustment can be achieved at the same time without increasing the device chip size or number of electrical parts.
|Number of pages||5|
|Journal||IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control|
|Publication status||Published - 1988 Nov|