Gyrotron V, the latest University of Sydney gyrotron, is a source of millimeter waves tunable from 150 to 300 GHz when operating at the fundamental of the electron cyclotron frequency and from 300 to 600 GHz when operating at the second harmonic. Quasioptical antennas are used to direct this radiation into an oversized waveguide leading to the experiment area. In this article, the performance of these antennas and coupling of radiation into the oversized waveguide are analyzed. Of special interest is a variety of quasioptical antenna employing a parabolic blazed grating which proves to be very effective in separating second harmonic radiation from fundamental.
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© 1998 American Institute of Physics.
1998
American Institute of Physics
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