Balanced type surface acoustic wave device

Details Balanced type surface acoustic wave device Balanced type surface acoustic wave device

1995-08-21

1998-02-24

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333194, 310313R, H03H 964

Patent

active

057215197

ABSTRACT:
The present invention provides surface acoustic wave devices which do not require a balanced-to-unbalanced transformer circuit regardless of the type of the peripheral circuits of the balanced type surface acoustic wave filter, i.e. a balanced type device or an unbalanced type. A transmitting interdigital transducer and a receiving interdigital transducer are formed on a substrate comprising 41.degree. Y cut-X propagation lithium niobate. A balanced type surface acoustic wave filter is formed on a substrate comprising 36.degree. Y cut-X propagation lithium tantalate. The balanced type surface acoustic wave filter comprises two series-arm surface acoustic wave resonators and two crossed-arm surface acoustic wave resonators connected in a lattice. The substrate on which the transmitting interdigital transducer and the receiving interdigital transducer are formed and the substrate on which the balanced type surface acoustic wave filter is formed are located in a ceramic package. One of the input terminals of the transmitting interdigital transducer is grounded. The output terminals of the receiving interdigital transducer are connected to the input terminals of the balanced type surface acoustic wave filter.

REFERENCES:
patent: 3573673 (1971-04-01), De Vries et al.
patent: 3886504 (1975-05-01), Hartmann et al.
patent: 4044321 (1977-08-01), Vasile
patent: 4126837 (1978-11-01), Koyamada et al.
patent: 4278492 (1981-07-01), Cross et al.
patent: 4354130 (1982-10-01), Ono et al.
patent: 4785270 (1988-11-01), Kinsman
patent: 5093638 (1992-03-01), Kusman et al.
"1992 Ultrasonics Symposium" (pp. 111-115).
"IEEE Transactions on Vehicular Technology, vol.38, 1989" (pp. 2-8).
"Proceedings on 1994 MTT-Symposium (1994) WE4A-2".

Affiliated with

Also associated with

Rating

Balanced type surface acoustic wave device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Balanced type surface acoustic wave device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Balanced type surface acoustic wave device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1877250