Patent ID: 8179304
Filing Date: 2012-05-15
Classification: G01S,H01P

Abstract:
1. A direct-current blocking circuit comprising: a dielectric substrate; a conductor layer which is formed between one surface and another surface of the dielectric substrate, and comprises a first portion, a second portion, and a third portion; a first planar line which includes the first portion of the conductor layer, and is located on the one surface side of the dielectric substrate with respect to the conductor layer; a second planar line which includes the second portion of the conductor layer, and is located on the one surface side of the dielectric substrate with respect to the conductor layer, with its one end at a predetermined distance away from one end of the first planar line; and a waveguide which includes the third portion of the conductor layer, and is located on the other surface side of the dielectric substrate with respect to the conductor layer in such a manner that, in a direction in which an electric signal is transmitted, its one end overlaps with one end of the first planar line and its another end overlaps with one end of the second planar line, in the conductor layer, in a region where the waveguide and the first planar line overlap, the waveguide and the first planar line being electromagnetically coupled to each other, and also in a region where the waveguide and the second planar line overlap, the waveguide and the second planar line being electromagnetically coupled to each other.