Trw Limited

Rahil U Bhorania

Alvin M Kong

Robert Bruce Stokes

Michael D Lammert

David Yip

Joseph P Trieu

The invention relates to a new family of surface acoustic wave single-phase unidirectional transducers (SPUDTs) by using M uniform width, uniformly spaced, single-level interdigitated electrodes lying on a uniform grid of a piezoelectric substrate where unidirectionality is achieved by selectively etching reflective structures into the substrate either in the spaces located between adjacent electrodes or under selected electrodes of the transducer. A SAW filter, resonator or delay line can also be formed by fabricating two such transducers on a single substrate, each having surface acoustic waves radiating towards the other.

Recessed reflector single phase unidirectional transducer

An RF switch and a process for fabricating an RF switch which includes multiple throws and can be fabricated utilizing only a single layer of metallization. The switch in accordance with the present invention includes an airbridge suspended beam disposed adjacent to one or more metal traces. One or more control pads are disposed adjacent to the airbridged suspended beam to operate the switch electrostatically. The suspended beam as well as the metal traces and contact pads are all fabricated with a single metallization layer. The switch is configured such that deflection of the beam is in a plane generally parallel to the plane of the substrate. By eliminating multiple metallization layers, the complexity for fabricating the switch is greatly reduced. Moreover, the switch configuration also allows multiple throws and multiple poles using a single level of metallization.

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Redondo Beach, CA, United States of America

Rahil U Bhorania