Resonator-type surface-acoustic-wave ladder filter with improved

Details Resonator-type surface-acoustic-wave ladder filter with improved Resonator-type surface-acoustic-wave ladder filter with improved

1997-01-28

2000-02-15

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333196, 310313C, 310313D, H03H 925, H03H 964

Patent

active

060257636

ABSTRACT:
In a resonator-type SAW filter, at least one series-arm SAW resonator has an interdigital transducer with reflectors on both sides, and the reflectors are separated from the interdigital transducer by a distance of from (N/2+0.55).lambda..sub.1 to (N/2+0.81).lambda..sub.1, where N is an arbitrary non-negative integer and .lambda..sub.1 is the wavelength of the surface acoustic waves excited by the SAW resonator. Alternatively, from 30% to 80% of the electrode fingers Constituting the interdigital transducer in at least one series-arm SAW resonator are apodized, dividing the interdigital transducer into an excitation region and a dummy region, and the electrode fingers in the dummy region are offset from the electrode fingers in the excitation region by a distance of 0.05.lambda..sub.1 to 0.31.lambda..sub.1.

REFERENCES:
patent: 5638036 (1997-06-01), Penunuri et al.
patent: 5654680 (1997-08-01), Kuwan et al.
Yoshio Satoh et al, "A low-loss band-pass filter using SAW-resonators connected into ladder type circuit," IEICE Technical Report US9-52 (Sep. 1992), pp. 9-16.
"Design Methodology and Experimental Results for New Ladder-Type SAW Resonator Coupled Filters", Hikita et al, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 42, No. 4, Jul. 1995, pp. 495-508.
"A Ladder Filter Using One-Port SAW Resonators", Technical Report of the Institute of Electronics, Information, and Communication Engineers, US95-25, EMD95-21, CPM95-33 (1995-07), pp. 39-46.

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