Abstract

A 94 GHz overmoded travelling wave tube (TWT) amplifier has been designed and experimentally implemented. The overmoded coupled cavity TWT operates in the TM 31 mode at 94 GHz. Lower order modes that may oscillate at lower frequencies in the cavity are suppressed using selectively placed lossy dielectric loading. The AlN dielectric loading has a negligible affect on the transmission of the TM31 mode. Operation in a higher order mode allows for a larger cavity at 94 GHz than the equivalent fundamental mode structure, permitting a larger beam tunnel and a higher current to propagate through the TWT. These advantages lead to an increase in the gain and peak power of the TWT.

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