| 摘要 |
PCT No. PCT/JP83/00269 Sec. 371 Date Mar. 26, 1984 Sec. 102(e) Date Mar. 26, 1984 PCT Filed Aug. 18, 1983 PCT Pub. No. WO84/01083 PCT Pub. Date Mar. 15, 1984.In an apparatus which produces high frequency electromagnetic waves, a choke portion is provided in a leakage transmission path, which choke portion has a groove wall corresponding to a grounded conductor, a number of strip conductors arranged with a line width a and a pitch p, and a groove bottom, so as to minimize leakage propagation in the longitudinal direction of the groove. Further, this choke portion is designed so that the characteristic impedance of its portion is changed in a region shorter than lambda /4 of the frequency to be used. As a result, the depth and width of the groove can also be made less than lambda /4.
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