Dajun Cheng

Electromagnetic scattering by a reciprocal uniaxial bianisotropic cylinder with arbitrary cross section: extended mode-matching method

Based on the eigenfunction expansion of electromagnetic waves in a reciprocal uniaxial bianisotropic medium, an extended mode-matching method is proposed to study the scattering of an infinitely long reciprocal uniaxial bianisotropic cylinder with arbitrary cross section. Excellent convergence of the echo width is numerically verified, which establishes the reliability and applicability of the present extended mode-matching method for the two-dimensional single-body problem in which the reciprocal uniaxial bianisotropic medium has a curved surface.

Electromagnetic scattering by a conducting cylinder coatedwith a uniaxial chiral layer of varying thickness: generalized mode-matching method

Based on the concept of characteristic waves and the method of angular spectral expansion, cylindrical vector wave functions are developed to represent the electromagnetic waves in a uniaxial chiral medium. To illustrate how to use the present cylindrical vector wave functions in a practical way, a generalized mode-matching method is proposed to study the electromagnetic scattering of a conducting circular cylinder coated with a uniaxial chiral layer of varying thickness. The excellent convergence property of the bistatic echo width is numerically verified, which establishes the reliability and applicability of the present cylindrical vector wave functions and generalized mode-matching method for a two-dimensional problem with a curved surface coating of a uniaxial chiral medium.

Dielectric resonator antennas for SAR applications

Over the last decade, considerable interest has been focused on the study of dielectric resonator antennas (DRAs). Recent studies have shown that DRAs exhibit wider impedance bandwidth, no surface wave, less conductor losses and smaller size when compared with microstrip patch antennas. These properties make them attractive for consideration for SAR antenna applications.

Green dyadic and dipole radiation in composite omega-chiral medium

Green dyadic and electromagnetic fields of a dipole radiator in a composite omega-chiral medium are presented by introducing a set of auxiliary fields. Right- and left-handed circularly polarized eigenwaves, which travel with different velocity and have exponentially-attenuated amplitude, can be simultaneously excited.