Acoustic Surface Wave Device.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent application relates to a surface acoustic wave coupler that filters electromagnetic leakage out of the coupled signal. Disclosed is a centrally positioned sender with receivers on each side, the outputs of which are fed to a difference amplifier that provides the system output. One receiver is more remote from the sender than the other so that the acoustic waves received will be out of phase, while the electromagnetic leakage will be in phase. The output of the difference amplifier is indicative of the total acoustic energy, with the electromagnetic leakage suppressed.
- Line, Surface and Bulk Acoustic Wave Devices