Abstract
SAW band pass filters were examined, in which three-transducer configurations consisting of one bidirectional transducer for an input and two group-type unidirectional transducers for an output are employed. The configuration has advantages, such as easy design for frequency responses, a low insertion loss and easy fabrication. Experiments were carried out using ceramic and LiNbO3 substrates. An insertion loss of 6.5 dB and ripples of group delay less than 100 nsec were obtained, showing that the configuration can be applied to a TV-intermediate-frequency filter with a high performance. It has been found that the good results are due not only to the directivity of the unidirectional transducers, but also to the inherent properties of the three-transducer configurations. Therefore, the improvements of the matching circuit and the phase shifters will result in better performance.
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