PROBLEM TO BE SOLVED: To obtain a power feeding circuit for a high frequency signal which is capable of reducing manufacturing costs and attaining reduction of an area to be occupied when juxtaposing a plurality of power feeding waveguides.
SOLUTION: A power feeding waveguide 1 comprises first and second metal blocks 2, 3. Between the first and second metal blocks 2 and 3, a dielectric substrate 4 is interposed. The dielectric substrate 4 is disposed in an intermediate part between a first narrow wall surface portion 1a and a second narrow wall surface portion 1b and disposed in parallel with the first and second narrow wall surface portions 1a, 1b. On both front and rear sides of the dielectric substrate 4, first to third short-circuiting conductive pattern parts 4b-4d each constituted of metallic films are formed while being spaced apart from one another in the axial direction of the power feeding waveguide 1.
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