Patent ID: 6756860
Filing Date: 2004-06-29
Classification: H01P

Abstract:
A dual band coupler, comprising:a first ground pattern formed on a first dielectric layer; a first main signal line having a first input terminal and a first output terminal, said first main signal line being a conductive pattern formed on a second dielectric layer laminated on the first dielectric layer; a coupling signal line having a coupling terminal and an isolation terminal, said coupling signal line being a conductive pattern formed on a third dielectric layer laminated on the second dielectric layer; a second main signal line having a second input terminal and a second output terminal, said second main signal line being a conductive pattern formed on a fourth dielectric layer laminated on the third dielectric layer; and a second ground pattern formed on a fifth dielectric layer laminated on the fourth dielectric layer; wherein the coupling signal line has overlapping areas with the first main signal line and the second main signal line to independently control coupling coefficients of the coupling signal line with the first and second main signal lines, respectively.