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Broadband linearly polarized beat-wave TEm1/TE11 mode converters
Authors:McDermott  DB Pretterebner  J Chong  CK Kinney  CF Razeghi  MM Luhmann  NC  Jr
Affiliation:Dept. of Appl. Sci., California Univ., Davis, CA ;
Abstract:Broadband linearly polarized waveguide mode converters have been developed to transform the high-order cylindrical TEm1 output wave from harmonic gyrotron amplifiers into the more useful TE11 fundamental waveguide mode. The converter's corrugation period is equal to the beat between the two waves and the bandwidth is predicted to be inversely proportional to the number of periods. Four-period TE 31/TE11 and TE41/TE11 converters with an azimuthal perturbation of mc=4 and mc =5, respectively, have yielded a peak conversion efficiency of 98% with a bandwidth greater than 3% and a one-period beat-wave converter has been designed to yield 12% bandwidth. However, it has been observed in measurements that the strong coupling in a short converter can lead to a shift of the center-frequency with an accompanying reduction of the efficiency and bandwidth. A two-period TE41/TE11 converter with 5% bandwidth displayed a 5% frequency shift and a conversion efficiency of only 86%
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