Surface wave devices with low passband ripple

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

2005-02-15

2005-02-15

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

C333S153000, C333S195000, C333S196000, C310S31300R

Reexamination Certificate

active

06856214

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, L. Reindl, S. Berek, U. Knauer, P. Heide and M. Vossiek, “Design, Fabrication, and Application of Precise Delay Lines at 2.45 GHz”, 1996 IEEE Ultrasonic Symposium, pp261 to 265.

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