Accurate Calculation of Mutual Coupling Between Apertures on a Large Coated Cylinder Using Mixed Potential Green's Functions

Abstract

A rigorous approach based on the closed-form mixed potential Green's function (MPGF) is developed to evaluate mutual coupling between apertures on an electrically large cylinder with dielectric covers. An improved procedure is outlined to provide accurate values of the MPGF both in the near and far field, including the axial line region. The cylindrical functions are represented in the form of ratios to avoid the numerical instabilities, making the MPGF able to handle electrically large problems. As a result, a high degree of accuracy is ensured in the calculation of the mutual admittance between two apertures with large separation on an electrically large cylinder. This approach is validated by comparison with published data, and its ability in dealing with complex and electrically large problems is also verified.Index Terms-Cylindrically stratified media, mixed potential Green's function (MPGF), mutual coupling, rational function fitting method (RFFM).

Analysis of Slotted Sectoral Waveguide Arrays With Multilayered Radomes

“…The cylindrically stratified medium that models the multilayered cylindrical dielectric radome together with free-space as the outermost layer forms Region II, for which new closed-form GF (CFGF) representations are developed for tangential magnetic currents. Note that although several studies on CFGF representations for cylindrically stratified media have already been reported to be used in conjunction with MoM for the design and analysis of microstrip and slot/aperture antennas and arrays [9]- [18], they are not valid within the source region (where two current modes can partially or fully overlap during the MoM procedure). Recently, reported CFGF representations for tangential electric current modes in [19] are valid and very accurate within the source region.…”