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Focusing of high power millimeter-wave radiation by a quasi-optical antenna system |
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| Authors: | SHOJI MIYAKE OSAMI WADA MASAMITSU NAKAJIMA TOSHITAKA IDEHARA G F BRAND |
| Affiliation: | 1. Welding Research Institute, Osaka University , Osaka, 567, Japan;2. Faculty of Engineering, Okayama University , Okayama, 700, Japan;3. Faculty of Engineering, Kyoto University , Kyoto, 606, Japan;4. Faculty of Engineering, Fukui University , Fukui, 910, Japan;5. School of Physics, University of Sydney , NSW, 2006, Australia |
| Abstract: | The focusing of millimeter-wave radiation from a high power 60 GHz gyrotron is studied using a two-dimensional ellipso-parabolic focusing antenna system. Fine focusing with an elliptic reflector gives a sheet beam of about 10 mm in thickness even at a high power input of about 100 kW. The addition of a parabolic reflector produces a finely focused and nearly Gaussian beam of about 10 mm in diameter with an energy density higher than lOOkWcm-2. Spatial distributions of beam power are compared with calculations and good agreement is obtained. |
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