Finite element method analysis of a Ka band swallow tail finline/mic mixer

Finite element method (FEM) analysis of high RF/LO isolation millimeter wave mixers has been performed in this paper. It aims to study the RF/LO isolation properties of the swallow tail finline mixer we did previously (Fu et al., 1998), which has backside metal at the end of unilateral finline taper. Experiment and simulation results both prove that swallow tail has broadband flatness adjustment ability for RF/LO isolation over Ka band.