Computation and design of portable adaptive antenna with chiral coating

Summary form only given. A portable adaptive antenna made of linear sources imbedded in a screened dielectric was proposed by Zaridze et al. (see Proc. IEEE AP Int. Symp., Orlando, Florida, p.2524-27, 1999). In this article, based on the method of Zaridze, an adaptive antenna with improved polarization properties is suggested due to the use, instead of a dielectric, chiral medium. A software package for computation and visualization of characteristics of such an antenna is presented and demonstrated. The interaction of antenna with the outside lossy dielectric body is also simulated and evaluated. The antenna considered is represented as an aggregate of linear sources imbedded in partially screened chiral medium of the given shape, dimensions and material properties. The number of excitation sources, their amplitudes, phases and situations, as well as wavenumber of excitation are the input parameters for the user. One can also choose the shape of antenna, its dimensions, undercoat material parameters and percent of the screened boundary. The lossy dielectric body, simulating the human head attached to the antenna, is also included in this scheme. The user may specify dimensions and complex permittivity of dielectric body, as well as its disposition with respect to the antenna. The created software package has been tested in a wide frequency range and for different geometrical, material and excitation parameters. The efficiency of software package to compute and optimize parameters of adaptive antenna alone or in the presence of lossy dielectric body is also demonstrated