Document Type
Thesis
Date of Award
5-31-1988
Degree Name
Master of Science in Electrical Engineering - (M.S.)
Department
Electrical Engineering
First Advisor
Edip Niver
Second Advisor
Gerald Martin Whitman
Abstract
The problem of the linearly tapered dielectric rod/conical antenna, excited by the HEI1 hybrid mode in a metallic circular waveguide , is rigorously studied. A theoretical model, and numerical investigation for the radiation characteristics of such an antenna are presented. The model is based on the combination of classical analysis of the Electromagnetic Fields within the dielectric rod, Local Mode Theory, and the Equivalence Principle for the determination of equivalent current distributions.
The far-zone radiation field is considered to be the summation of the fields produced by two radiative components in the dielectric rod/conical structure: The "aperture" of the uniform dielectric rod at the transition plane (rod/cone interface), and the dielectric cone itself. In the former case, the field is obtained from the equivalent surface current distributions on the aperture surface, whereas in the latter case, the field is obtained from the volume polarization current distribution in the conical structure.
The resulting integral expressions for the far field, are evaluated numerically, by means of a computer program developed in FORTRAN n which utilizes some commonly used mathematical routines. Numerical results are obtained by considering different parameters such as the length of the taper, the dielectric constant er, the rod diameter etc. Some of the results are compared with available experimental data; the agreement is found to be excellent.
Recommended Citation
Georghiades, Nicholas I., "The tapered dielectric rod-conical antenna" (1988). Theses. 3078.
https://digitalcommons.njit.edu/theses/3078
