| 摘要 |
PCT No. PCT/US89/00389 Sec. 371 Date Sep. 5, 1990 Sec. 102(e) Date Sep. 5, 1990 PCT Filed Jan. 31, 1989 PCT Pub. No. WO89/07346 PCT Pub. Date Aug. 10, 1989.A waveguide is provided which can include a bearing supporting a probe or other equipment for rotation. In order to prevent particles of the waveguide metal or waveguide cleaning materials embedded in the metal from entering the bearing, a window is fitted across the waveguide at a selected position between two waveguide sections or at each of a number of positions, the window being transparent to microwave transmission, being capable of transmitting pressure and being capable of filtering particles of a diameter in excess in 0.005 inch (0.013 cm).
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