Coupler for electrical waveguides and mechanical waveguides

Details Coupler for electrical waveguides and mechanical waveguides Coupler for electrical waveguides and mechanical waveguides

1991-11-01

1993-06-15

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Nonreciprocal gyromagnetic type

333157, 310323, H03H 500

Patent

active

052202968

ABSTRACT:
A system for coupling energy between electrical and mechanical waves includes a mechanical waveguide for propagating a mechanical wave having a mechanical wavelength at a given frequency, and an electromechanical energy converter for coupling energy between electrical and mechanical waves attached to a portion of the waveguide and capable of propagating an electrical wave having an electrical wavelength substantially equal to the mechanical wavelength at the given frequency. The portion has a length, measured in units of coupled wavelength, which is selected on the basis of the reciprocal of the coupling strength of the electromechanical converter and a selected amount of wave energy to be coupled. The function is based primarily on desired efficiency and may also be an odd integer multiple of the coupling strength reciprocal, preferably one. Piezoelectric elements are the preferred electromechanical energy conversion elements. This system is applicable to damping of structural waves, transferring structural waves from one mechanical waveguide- to another, and for creating a linear motor.

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"Damping of Structural Vibrations with Piezoelectric Materials" J. Sound and Vibration, vol. 146, No. 2, pp. 243-268, 1991.
"Ultrasonic Linear Motors Using a Multilayered Piezoelectric Actuator" Ferroelectrics, vol. 87, pp. 331-334, 1988.

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