58-MHz surface-acoustic-wave video intermediate-frequency filter using ZnO-sputtered film

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Abstract
The acoustic‐surface‐wave filter for the use of video intermediate frequency at 58 MHz was fabricated using an rf‐sputtered ZnO film overlying the interdigital electrodes and the wave path on a glass substrate, and its fundamental properties for practical application were studied. The average and easily reproducible insertion loss characteristics are as follows: 16 dB at the minimum, 5(+16) dB at chromatic and picture signal carrier frequencies, 15(+16) dB at sound signal carrier frequency, more than 55(+16) dB at trap frequencies for adjacent channels, and 35(+16) dB at the maximum side lobe. The triple transit echo suppression is more than 30 dB. The temperature coefficient of the frequency characteristic is 30 ppm/°C. 400 days of aging has shown no significant change in the filter.

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