DIRECTIONAL COUPLER AND WIRELESS COMMUNICATION DEVICE

摘要

A directional coupler including a main line, a sub-line, an input terminal, an output terminal, a coupling terminal and an isolation terminal, wherein the main line includes a first main-line section formed on a first layer, and a second main-line section formed on a second layer; the first and the second main-line sections are connected in parallel between the input and the output terminals; the sub-line includes a first sub-line section formed on the first layer, and a second sub-line section formed on the second layer; the first and the second sub-line sections are connected in parallel between the coupling and the isolation terminals; the first main-line section and the first sub-line section are disposed in close proximity to each other to generate electromagnetic coupling; and the second main-line section and the second sub-line section are disposed in close proximity to each other to generate electromagnetic coupling.

主权项

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 includes a first main-line section formed on a first conductor layer within said plurality of conductor layers, and a second main-line section formed on a second conductor layer within said plurality of conductor layers; said first main-line section and said second main-line section are electrically connected in parallel with each other between said input terminal and said output terminal; said sub-line includes a first sub-line section formed on said first conductor layer, and a second sub-line section formed on said second conductor layer; said first sub-line section and said second sub-line section are electrically connected in parallel with each other between said coupling terminal and said isolation terminal; said first main-line section and said first sub-line section are disposed in close proximity to each other to generate electromagnetic coupling therebetween; and said second main-line section and said second sub-line section are disposed in close proximity to each other to generate electromagnetic coupling therebetween.