Patent ID: 8330563
Filing Date: 2012-12-11
Classification: H01P

Abstract:
1. A choke structure for waveguides of a pair of high-frequency members, comprising: said pair of high-frequency members that, respectively, have said waveguides and are attached to each other as a pair such that the waveguides communicate with each other, a choke structure for the waveguides being formed at an attaching point of the high-frequency members, wherein a single choke groove or a plurality of choke grooves are formed at a portion or portions of area located along open ends of the waveguides and being away from the open ends by λ/4 of a free space wavelength λ of an electromagnetic wave transmitting through the waveguides at a depth substantially equal to λ/4 on each of attaching surfaces of the high-frequency members, and the choke grooves are arranged such that spaces formed by the choke grooves communicate with one another while substantially surrounding the waveguides when the high-frequency members are attached to each other, and wherein one of the high-frequency members comprises: a waveguide plate, made of a conductive material, which has a plate thickness of λ/4 and has through holes forming the corresponding waveguide and the corresponding choke grooves and extending along a direction of the plate thickness; and a dielectric substrate which is attached to a surface of the waveguide plate on a side opposite to a side of the corresponding attaching surface and has ground patterns at portions covering open ends of the through holes forming the corresponding choke grooves to form bottom walls of the choke grooves, and the other high-frequency member comprises: a first waveguide plate, made of a conductive material, which has a plate thickness of λ/4 and has through holes forming the corresponding waveguide and the corresponding choke grooves and extending along a direction of the plate thickness; and a second waveguide plate, made of a conductive material, which is attached to a surface of the first waveguide plate on a side opposite to a side of the corresponding attaching surface and has a through hole forming the corresponding waveguide extending along a direction of the second waveguide plate thickness.