Saw filter and mobile telephone using same

Details Saw filter and mobile telephone using same Saw filter and mobile telephone using same

1990-06-05

1992-07-14

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333196, 333133, 310313B, H03H 964

Patent

active

051306816

ABSTRACT:
A plurality of interdigital transducers (IDTs) of a surface acoustic wave bandpass filter, each of which has a plurality of electrode fingers arranged in a direction perpendicular to a propagating direction of surface acoustic wave, are connected alternatively to an input terminal and an output terminal of said filter. The IDTs are different in number of electrode fingers and in average value of inter-finger distance from each other and distance between adjacent IDTs are different. At least one of the outermost IDTs has a minimum number of electrode fingers and a maximum average value of inter-finger distance, compared with those of other IDTs.

REFERENCES:
patent: 3845419 (1974-10-01), Nudd
patent: 4492940 (1985-01-01), Hikita
patent: 4649357 (1987-03-01), Nagai et al.
patent: 4939487 (1990-07-01), Yuhara et al.

Affiliated with

Also associated with

Rating

Saw filter and mobile telephone using same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Saw filter and mobile telephone using same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Saw filter and mobile telephone using same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-337585