Frequency Responses of Surface-Acoustic-Wave Filters with Two-Track Slanted Finger Interdigital Transducers
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概要
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In this study, the scattering characteristics of a novel surface-acoustic-wave (SAW) filter with two-track slanted finger interdigital transducers (SFITs) are investigated. The novel SAW filter consists of two-track input and output SFITs, with each track configured in many subfilters in parallel connection. Because the arrival time of a SAW may differ among subfilters, passband ripples appear. However, by properly controlling the gap length between the input and output SFITs of each track, passband ripples can be eliminated evidently. Moreover, due to differences in radiation conductance among subfilters, a curve fitting technique is used to design the overlap width of each subfilter to maintain the passband responses of the SAW filter as flat as possible. A Chebyshev polynomial and a two-step weighting technique are employed to decrease sideband level. Simulation results show that by tailoring SAW SFITs and the gap difference of each track, a high-performance broadband IF filter can be obtained.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2005-06-15
著者
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Tung Hsin-Yuan
Department of Electrical Engineering, I-Shou University, 1, Section 1, Hsueh-Cheng Road, Ta-Hsu Hsiang, Kaohsiung, Taiwan 840, R.O.C.
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Tung Hsin-Yuan
Department of Electrical Engineering, I- Shou University, 1, Section 1, Hsueh-Cheng Road, Ta-Hsu Hsiang, Kaohsiung, Taiwan 840, R.O.C.
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Ro Ruyen
Department of Communication Engineering, I-Shou University, 1, Section 1, Hsueh-Cheng Rd., Ta-Hsu Hsiang, Kaohsiung County 840, Taiwan, R.O.C.
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Ro Ruyen
Department of Electrical Engineering, I-Shou University, 1, Section 1, Hsueh-Cheng Road, Ta-Hsu Hsiang, Kaohsiung, Taiwan 840, R.O.C.
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