A Low-Loss SAW-TV-IF Filter With an Extended Impedance Matching Range

Jun Yamada; Yuuji Fujita; Takashi Shiba; Tatsuro Toyama

doi:10.1109/58.9322

A Low-Loss SAW-TV-IF Filter With an Extended Impedance Matching Range

Jun Yamada, Yuuji Fujita, Takashi Shiba, Tatsuro Toyama

RIEC - Information Communication Platforms Division

Hitachi, Ltd.

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	668-672
Number of pages	5
Journal	IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume	35
Issue number	6
DOIs	https://doi.org/10.1109/58.9322
Publication status	Published - 1988 Nov

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abstract = "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.",

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AB - 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.

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A Low-Loss SAW-TV-IF Filter With an Extended Impedance Matching Range

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