Dyadic Green's function of an ideal hard surface circular waveguide with application to excitation and scattering problems

Abstract

[1] Green's function analysis of ideal hard surface circular waveguides is proposed with application to excitation and scattering problems. A decomposition of the hard surface waveguide into perfect electric conductor and perfect magnetic conductor waveguides allows the representation of dyadic Green's function in terms of transverse electric (TE) and transverse magnetic (TM) waveguide modes, respectively. In addition, a term corresponding to a transverse electromagnetic (TEM) mode is included in the representation of the Green's dyadic. The TEM term is extracted in closed form from the eigenmode expansion of TM and TE modes in the zero-cutoff limit. The electric field distribution due to an arbitrarily oriented electric dipole source is illustrated for representative TM, TE, and TEM modes propagating in the ideal hard surface circular waveguide. The derived Green's function is used in the method of moments analysis of an ideal hard surface waveguide excited by a half-wavelength strip dipole antenna. In addition, the scattering of the TEM mode by a thin strip is studied in the ideal hard surface circular waveguide.

Dyadic Greens Function of the Hard Surface Rectangular Waveguide Verified Numerically by a Realistic Model

“…Based on these realistic hard surface guided-wave structures, mathematical models are proposed to analyze their characteristics. Recently, ideal hard surface circular waveguides have been investigated [4].…”

Artificial magnetic conductors realised by frequency-selective surfaces on a grounded dielectric slab for antenna applications

“…Another common method is to introduce perfect electric conductor ( PEC) strips on a dielectric slab of certain thickness [5][6][7][8][9]. The main characteristics of such strip-loaded surfaces can be modelled by using an ideal model, which represents alternating PEC and PMC strips with vanishing widths [2], [10][11][12]. These anisotropic surfaces are polarisationdependent, such that the hard surface behaves like a PMC for TE-polarised waves and as a PEC for TM-polarised waves propagating along the strips (corrugations).…”

Green's function analysis of an ideal hard surface rectangular waveguide

“…Hard surfaces can also be implemented in guided‐wave structures, for example, rectangular or circular waveguides. Modal characteristics of an ideal hard surface circular waveguide have been recently investigated by Klymko et al [2005]. In this paper, we study a rectangular waveguide with an ideal hard surface boundary conditions, which is modeled by alternating longitudinal PEC and PMC strips with vanishing widths.…”