| 摘要 |
PURPOSE:To remarkably facilitate the manufacture by using a circular waveguide interposing discontinuous part whose guide diameter is increased/ decreased repetitively stepwide at a prescribed period over a prescribed range so as to apply the conversion of electromagnetic wave transmission mode between the TEon mode and the TEom mode. CONSTITUTION:Two kinds of circular waveguides having a length (l) whose radius is changed as a single step by + or -DELTAa at the middle of the circular waveguide having a radius (a) acting like an oversize waveguide with respect to a wavelength of an electromagnetic wave to be sent are formed while the plural discontinuous parts are connected in cascade alternately with the center axis coincident with each other. Actually, two kinds of circular waveguides having a length (l) and radii of a+DELTAa and a-DELTAa may be manufactured by fitting them coaxially. Moreover, the inner circumferential face of the cylinder conductor having a thickness whose radius is not in excess of a-DELTAa is processed and manufactured by means of, e.g., a boring lathe. Thus, the structure is simplified and the design/manufacture is facilitated considerably.
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