ANALYSIS OF ELECTROMAGNETIC-WAVE TRANSMISSION THROUGH A CHOKE USING FE-BIM WITH ARBITRARY INCIDENT ANGLE POLARIZATION/

The performance of a microwave choke is analyzed by the finite element -boundary integral method (FE-BIM) for an incident wave with arbitrary angle/polarization. The equivalence principle is used to divide the w hole region into three subregions: incident region, choke region, and transmitted region, The functional in the choke region is derived with an appropriate boundary condition between subregions. The choke regio n is discretized by rectangular meshes. Vector edge elements are used for the representation of the cross-sectional electric field, while no de elements are used for the axial-directional electric field, The ele ctric fields in the cross section of the choke are determined by the R ayleigh-Ritz procedure. The performance of a microwave choke is analyz ed by investigating the transmission characteristics of the choke for a plane wave with varying incident angle and polarization. Experiments have been done using a rectangular waveguide with the choke structure inside. The results agree very well with the theoretical prediction.