DIRECTIONAL COUPLER AND INFORMATION COMMUNICATION TERMINAL EMPLOYING IT

摘要

PROBLEM TO BE SOLVED: To solve the problem that the directivity becomes lower than 8 dB because the profile is large when a directional coupler is arranged on the same plane, and a parasitic inductive component is produced in a via hole connecting a coupling line and a terminator when the directional coupler is arranged in a multilayer substrate thus causing mismatch between the coupling line and the terminator. SOLUTION: A directional coupler is arranged in a multilayer substrate 1 and a termination resistor, i.e. a first resistor 6, is connected with a via hole 4 through a first capacitor 5 thus obtaining a directional coupler having directivity of 8 dB or above in one or two frequency bands. COPYRIGHT: (C)2005,JPO&NCIPI