A new type of millimeter wave integrated directional couplers

A new type of millimeter wave integrated directional couplers is presented. It is constructed by a series of E-plane fins and slots the lengthes of which are optimized. The design is based on the scattering matrix considering the effects of the thickness of fins and high order mode interactions at the step discontinuities. The calculated performance of two integrated couplers at Ka- and W-band are given.