Design techniques for SAW filters using slanted finger interdigital transducers
- 1 March 1997
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
- Vol. 44 (2), 453-459
- https://doi.org/10.1109/58.585130
Abstract
This paper describes useful design techniques for wide-band linear phase SAW filters using slanted finger interdigital transducers (SFITs): to increase stop band attenuation, to flatten the pass band response, and to draw SFIT patterns for photo-masks. In order to increase stop band attenuation, a withdrawal-weighted SFIT is employed. A combination of a withdrawal-weighted SFIT and an unweighted SFIT provides good stop band responses, even though the number of finger pairs is small. In order to achieve a desired amplitude response in the pass band, an aperture-weighting technique for divided channels of SFITs is presented. A design method for drawing SFIT patterns for photo-masks is also described. A linear-phase SAW filter using SFITs with a 50% fractional bandwidth is designed and fabricated on 128/spl deg/ y-x LiNbO/sub 3/. A sidelobe suppression of 40 dB and a 3 dB to 40 dB shape factor of 1.12 were realized. Good agreement between theoretical and experimental results is obtained.Keywords
This publication has 11 references indexed in Scilit:
- SAW filters with weighted tapered interdigital transducersPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- New design techniques for SAW filters using slanted-finger IDTsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Withdrawal weighted fan-shaped SAW transducersIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 1995
- A New Low-Loss, Single-Bounce, Reflective Array Filter Using Hyperbolically Tapered TransducersPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1986
- Simplified Computer-Aided Fabrication of SAW Transducer Pattern MasksIEEE Transactions on Sonics and Ultrasonics, 1984
- Improved Modeling of Wide-Band Linear Phase SAW Filters Using Transducers with Curved FingersIEEE Transactions on Sonics and Ultrasonics, 1984
- Wide-Band Linear Phase SAW Filter Design Using Slanted Transducer FingersIEEE Transactions on Sonics and Ultrasonics, 1982
- Acoustic Radiation Measurements and Calculations for Three Surface Wave Filter DesignsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1973
- Weighting Interdigital Surface Wave Transducers by Selective Withdrawal of ElectrodesPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1973