A Fast Hybrid MoM/FEM Technique for Microstripline Vertical Couplers With multiple Identical Cavities

摘要

A hybrid technique [1] has successfully modeled cavity-backed patch antennas [1] and microstripline-fed slot-coupled resonant cavities[2]. This technique primarily follows the MoM, except in the cav-ity the Green's function is replaced by the solutions of FEM such that the exact Green's function is not needed. Due to the flexibility of FEM, the shape of the cavity is not restricted to be rectangular or cylindrical and the cavity can be filled with complex material. Thus, this technique preserves the efficiency of MoM while retains the flexibility of FEM. Base on the above technique, the formulation of multiple cavities is derived in this paper. A novel technique to reduce the computational cost to the case of only one cavity when all cavities are identical is introduced. Comparison of simulation results and experimental data are also shown.