THEORETICAL-STUDY OF VARIATION OF PROPAGATION CONSTANT IN A CYLINDRICAL WAVE-GUIDE DUE TO CHIRALITY - CHIRO-PHASE SHIFTING

We discuss a conceptual idea for a reciprocal phase shifting using chi ral materials. Such phase shifters, which can be called chiro-phase sh ifters, may, in principle, consist of a general cylindrical waveguide in which a thin chiral rod is inserted longitudinally. A standard comm only used perturbation technique is utilized to analyze theoretically the effects of a chiral rod's parameters (and in particular its chiral ity admittance) on propagation constants of guided modes in such waveg uides. A simple expression relating the relative change of propagation constants to other relevant quantities such as polarization character istics of unperturbed guided modes, material parameters of chiral rod, and location of the rod is presented, and the case of a circular meta llic chiro-phase shifter is discussed in some detail. Physical insight s into the results are also provided.