Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1989-07-12
1991-10-15
LaRoche, Eugene R.
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333195, H03H 900
Patent
active
050578006
ABSTRACT:
A method and apparatus for diffracting magnetostatic waves (MSW) in a garnet film by surface acoustic waves (SAW) so that spectral analysis may be performed on an input microwave signal having a plurality of frequency components. The garnet film, advantageously a YIG film, has a piezoelectric layer of zinc oxide which receives at an interdigital transducer an rf signal to propagate surface acoustic waves (SAW) in the YIG film. The SAW space and time modulates the properties of the YIG film as to diffract magnetostatic waves. A microwave input signal having a plurality of spectral components is supplied to the YIG film, as is a magnetic biasing field, whereby MSW propagates therein. Because of the diffraction of MSW caused by SAW, different spectral components of the microwave signal are obtained at different positions and are output at individual channels.
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Ham Seung
LaRoche Eugene R.
Polytechnic University
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