FREQUENCY TUNABLE RF PHASE SHIFTER OR CIRCULATOR HAVING A WIDE-BAND SAW-MULTIFERROIC HYBRID DEVICE
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United States of America Patent
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Issued Date -
Oct 19, 2023
app pub date -
Jun 22, 2023
filing date -
Apr 28, 2021
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Abstract
A nonreciprocal microwave phase shifter or circulator includes a substrate, a transducer on a surface of the substrate and configured to reciprocally convert between electrical signals to acoustic waves, a first piezoelectric material configured to generate and transport acoustic waves from a signal applied to the transducer, and a thin film magnetic material configured to couple to acoustic waves through magnetoelastic coupling so as to have nonreciprocal magnetoelastic coupled acoustic wave transport. Phase shifts of acoustic waves through the thin film magnetic material in directions toward and away the transducer have significantly different magnitudes.
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