MULTI-LAYER DIRECTIONAL COUPLER

摘要

A multi-layer directional coupler for adjusting the amount of coupling from outside without disassembly is disclosed. The coupler includes a first dielectric layer, a signal line disposed on the first dielectric layer, a second dielectric layer disposed over the first dielectric layer, a first floating conductor disposed on the second dielectric layer, and a third dielectric layer disposed over the second dielectric layer. Here, at least one hole, in which a tuning element is inserted, is formed in the third dielectric layer, and an entry depth of the tuning element in the hole is changed.