Surface wave devices with low passband ripple

Details Surface wave devices with low passband ripple Surface wave devices with low passband ripple

2006-04-04

2006-04-04

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S196000

Reexamination Certificate

active

07023300

ABSTRACT:
Very low passband ripple is provided in a wide bandwidth high frequency SAW FIR filter using slanted finger IDTs by one or more of three techniques: cancelling regenerated SAWs at parallel-connected input IDTs of two SAW filters which are similar except for a quarter-wavelength difference in spacing of the input and output IDTs, this difference varying with wavelength across the IDT aperture; shaping edges of shield electrodes to provide quarter-wavelength differences in, and hence cancellation of, SAWs reflected at the edges, the differences varying with wavelength across the IDT aperture; and making pairs of slanted shield electrodes symmetrical to compensate for refraction of SAWS by the shield electrodes.

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C.C.W. Ruppel et al., “Design, Fabrication, and Application of Precise Delay Lines at 2.45 GHz”, 1996 IEEE Ultrasonics Symposium, pp. 261-265.

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