Mmi. Saadoun et N. Engheta, THEORETICAL-STUDY OF VARIATION OF PROPAGATION CONSTANT IN A CYLINDRICAL WAVE-GUIDE DUE TO CHIRALITY - CHIRO-PHASE SHIFTING, IEEE transactions on microwave theory and techniques, 42(9), 1994, pp. 1690-1694
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.