Jabil Inc.
HIGH DIRECTIVITY COMPACT SIZE INTER LAYER COUPLER

Abstract:

A high directivity compact size inter-layer coupler that has application for coupling off a pre-distortion coupling signal from a main signal at an output of a power amplifier to a pre-distortion circuit. The coupler includes a main signal line formed on a surface of a first dielectric layer opposite to a second dielectric layer, where the main signal line receives the main signal, and a coupling line formed between the second dielectric layer and a third dielectric layer, where the coupling line is electromagnetically coupled to the main line so as to generate the coupling signal thereon. The coupling line has a general U-shape including a first leg portion, a second leg portion and a transverse portion between the first and second leg portions. The transverse portion includes a plurality of spaced apart blocks coupled together by a narrow line portion.