Experimental results on SAW filters with one bidirectional and two unidirectional transducers.

• Tsukamoto Masahide

  Wireless Research Laboratory, Matsushita Electric Industrial Co., Ltd.

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.

Journal

• Japanese Journal of Applied Physics

  Japanese Journal of Applied Physics 19 (4), 737-744, 1980

  The Japan Society of Applied Physics

Keywords

• General Physics and Astronomy
• Physics and Astronomy (miscellaneous)
• General Engineering

Details

• CRID: 1390282681231585920
• NII Article ID: 110003896467
• NII Article ID: 210000020483
• NII Article ID: 130003462723
• NII Book ID: AA00690800
• DOI: 10.1143/jjap.19.737
• ISSN: 13474065
• ISSN: 00214922
• Web Site: http://stacks.iop.org/1347-4065/19/i=4/a=737/pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed