Electromagnetic modelling of impedance-loaded dielectric space-frame radomes

For the EM design phase involving parametric studies on the effect of radome geometry, strut cross-section and compensation designs, a fast method of evaluation is required. The authors describe a radome scattered field solution based on an oblique MOM solution which gives all scattered field components at any combination of the four incidence and scattering angles, including the depolarised fields, for arbitrary cross-section shape inhomogeneous cylinders of infinite length. These fields are used to find the full 3D scattered field solution for finite length cylinders, with very general incident field conditions, via plane wave spectrum ideas. This provides an accurate solution to the problem of finding the radome scattered field at any angle in space when the enclosed antenna is not restricted to being a large reflector. Complete antenna patterns may be generated as the radom rotates relative to the antenna, thereby allowing the modified sidelobe envelope to be seen for all antenna pointing directions