Iterative method using constrained optimization techniques for second-order effects compensation in SAW filters

P.J Naglowski

doi:10.1109/ultsym.1989.66971

Iterative method using constrained optimization techniques for second-order effects compensation in SAW filters

P.J Naglowski

https://doi.org/10.1109/ultsym.1989.66971

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Publication Date: Oct 3, 1989

Citations: 8

Affiliation: University of California, Santa Barbara, Institute of Electronic Materials Technology

#Surface Acoustic Wave Filters #Interdigital Transducer + Show 8 more

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Abstract

A novel algorithm for broadband compensation of second-order effects in SAW (surface acoustic wave) filters consisting of one apodized and one unapodized interdigital transducer (IDT) is presented. The method ensures effective compensation of second-order effects even at frequencies close to or equal to zeros of unapodized IDT response. In contrast to earlier methods, inequality constraints are imposed on positions of gaps in apodized IDT. Owing to this feature, this fixed aperture of the IDT can be easily maintained throughout the compensation process. Compensation results are given for a 14 lambda aperture SAW TV-IF filter. >

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