Applied Materials, Inc.
Generalized cylindrical cavity system for microwave rotation and impedance shifting by irises in a power-supplying waveguide

Abstract:

A rotating microwave is established for any resonant mode TE.sub.mnl or TM.sub.mnl of a cavity, where the user is free to choose the values of the mode indices m, n and l. The fast rotation, the rotation frequency of which is equal to an operational microwave frequency, is accomplished by setting the temporal phase difference .DELTA.O and the azimuthal angle .DELTA..theta. between two microwave input ports P and Q as functions of m, n and l. The slow rotation of frequency .OMEGA..sub.a (typically 1-1000 Hz), is established by transforming dual field inputs .alpha. cos .OMEGA..sub.at and .+-..alpha. sin .OMEGA..sub.at in the orthogonal input system into an oblique system defined by the angle .DELTA..theta. between two microwave ports P and Q.