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Design technique for nonlinear phase SAW filters using slanted finger interdigital transducers

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1 Author(s)
Yatsuda, H. ; Japan Radio Co. Ltd. Lab., Saitama, Japan

This paper describes a useful design technique to achieve a nonlinear phase SAW filter using slanted finger interdigital transducers (SFITs) or tapered interdigital transducers which are suitable for wide-band filters in intermediate frequency stages. A required nonlinear phase response in the passband can be obtained by changing center-to-center distances between input and output SFITs along an axis perpendicular to the SAW propagation axis. The design is based on a building-block approach in the frequency domain. A nonlinear phase SAW filter with a center frequency of 70 MHz and a fractional bandwidth of about 10% is demonstrated on x-cut 112.2/spl deg/ y-propagating LiTaO/sub 3/. Because the substrate has a power flow angle of 1.55 degrees, the SFIT pattern is tilted along that angle. Good agreement between theoretical and experimental results is obtained.

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Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:45 ,  Issue: 1 )