Patent ID: 9531053
Filing Date: 2016-12-27
CPC Classification: H01P,H04B

Claim Text:
1. A directional coupler comprising: a main line capable of transmitting a high-frequency signal; an input terminal disposed at one end of said main line for introducing the high-frequency signal into said main line; an output terminal disposed at the other end of said main line for delivering the high-frequency signal from said main line; a sub-line electromagnetically coupled to said main line for extracting a portion of the high-frequency signal; a coupling terminal disposed at one end of said sub-line; and an isolation terminal disposed at the other end of said sub-line, said main line, said input terminal, said output terminal, said sub-line, said coupling terminal, and said isolation terminal being disposed within a laminate having a plurality of conductor layers laminated with an insulating layer disposed between respective ones of said conductor layers, wherein: said main line and said sub-line extend in a loop shape in parallel with and spaced apart from each other by a gap such that electromagnetic coupling is generated therebetween and such that said main line is positioned outside said sub-line on a coupling layer, said coupling layer being one of said plurality of conductor layers; said input terminal, said output terminal, said coupling terminal, and said isolation terminal are disposed outside said main line, when viewed from a laminating direction of said laminate; and said main line is interposed between said output terminal and said sub-line, when viewing said laminate from the laminating direction.