Experimental Results on SAW Filters with One Bidirectional and Two Unidirectional Transducers

概要

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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 LiNbO_3 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.
社団法人応用物理学会の論文
1980-04-05