Wideband waveguide terminators based on ferroepoxide
Waveguide terminators form a part of many microwave systems. One of the most significant values of waveguide terminators is the standing wave coefficient. Low level of the standing wave coefficient value of waveguide terminator is achieved by placing into it a resistive element made from appropriate radar absorbing material of special shape. A radar absorbing material with unique electromagnetic properties was developed. The material based on carbonyl iron and epoxy resin. The possible application of the material was studied at the paper. Particularly, it is shown that the radar absorbing material can be used for manufacturing of waveguide terminators of waveguide types WR-159, WR-112 и WR-90. The calculation results for waveguide terminators with absorbers having simple wedge, pyramid and exponential wedge shapes with optimized geometrical parameters are shown. Calculations are performed by the electrodynamic modeling software package FEKO using electrodynamic parameters, such as permittivity and permeability of the material measured on a sheet sample. Verification of numerical simulation results were performed on the WR-159 waveguide with the simple wedge-shaped absorber. Implementation of the developed radar absorbing material one allows to achieve low values of standing wave coefficient at the lower length of the absorber that can find benefits in the application of small microwave devises.