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Monolithic surface-acoustic-wave phase shifter

Monolithic surface-acoustic-wave phase shifter

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A monolithic surface-acoustic-wave phase shifter is described. The device consists of a distributed Schottky-barrier varactor junction capable of varying the electrical boundary conditions seen by a surface acoustic wave propagating on a piezoelectric medium. Almost 180° of phase shift is achieved in 55 acoustic wavelengths of interaction region at 54 MHz.

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      • Alusow, J.A., Burke, B.E., Stern, E.: `A surface wave electronically variable phase shifter', paper P-9, IEEE ultrasonics symposium, 1971.
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      • Chao, G.: `Time-variant and microwave acoustic signal processing', 1971, Ph D. dissertation, Stanford University, p. 24.
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