Numerically efficient analysis of printed structures in cylindrically layered media using closed-form green’s functions

A hybrid method to calculate mutual coupling of electric or magnetic current elements on a cylindrically layered structure using MoM is presented. For the calculation of the MoM matrix entries, when rho = rho´, if phi is not close to phi´, the closed-form Greenpsilas functions are employed. When phi is close to phi´, since the spectral-domain Greenpsilas functions do not converge, MoM matrix elements are calculated in the spectral domain. The technique is applied to both microstriplines and slots placed on a layered cylindrical structure. The computational efficiency of the analysis of mutual coupling of printed elements on a cylindrically layered structure is increased with the use of proposed hybrid method due to use of closed-form Greenpsilas functions. Beside the presented geometries used in the analysis, multilayer coupling geometries such as slot-coupled microstrip patch antennas and slot antenna with microstrip feeding can also be analyzed.