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A waveguide flange is a connector for joining sections of waveguide, and is essentially the same as a pipe flange—a ''waveguide'', in the context of this article, being a hollow metal conduit for microwave energy. The connecting face of the flange is either square, circular or (particularly for large〔 or reduced-height rectangular waveguides), rectangular. The connection between a pair of flanges is usually made with four or more bolts, though alternative mechanisms, such as a threaded collar, may be used where there is a need for rapid assembly and disassembly.〔 Dowel pins are sometimes used in addition to bolts, to ensure accurate alignment, particularly for very small waveguides. Key features of a waveguide join are; whether or not it is air-tight, allowing the waveguide to be pressurized, and whether it is a ''contact'' or a ''choke'' connection. This leads to three sorts of flange for each size of rectangular waveguide. For rectangular waveguides there exist a number of competing standard flanges which are not entirely mutually compatible.〔 Standard flange designs also exist for double-ridge, reduced-height, square and circular waveguides. ==Pressurization== The atmosphere within waveguide assemblies is often pressurized, either to prevent the ingress of moisture, or to raise the breakdown voltage in the guide and hence increase the power that it can carry. Pressurization requires that all joints in the waveguide be airtight. This is usually achieved by means of a rubber O-ring seated in a groove in the face of at least one of flanges forming each join. ''Gasket'', ''gasket/cover'' or ''pressurizable'' flanges (such as that on the right of figure 2), are identifiable by the single circular groove which accommodates the O-ring. It is only necessary for one of the flanges in each pressurizable connection to be of this type; the other may have a plain flat face (like that in figure 1). This ungrooved type is known as a ''cover'', ''plain'' or ''unpressurizable'' flange. It is also possible to form air-tight seal between a pair of otherwise unpressurizable flanges using a flat gasket made out of a special electrically conductive elastomer. Two plain cover flanges may be mated without such a gasket, but the connection is then not pressurizable. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Waveguide flange」の詳細全文を読む スポンサード リンク
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