Transient Radiation from Coaxial Waveguide and Cylindrical Monopole Antennas

Citation

Broome, Norval Lagier (1974) Transient Radiation from Coaxial Waveguide and Cylindrical Monopole Antennas. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/5MP2-DD24. https://resolver.caltech.edu/CaltechETD:etd-09302005-110310

Abstract

In this work the coaxial waveguide antenna is treated by the Wiener-Hopf technique and the transient radiation from a cylindrical monopole is developed in the light of the rigorous results obtained from the Wiener-Hopf analysis. Analytic expressions are derived for (1) the electromagnetic fields in the feed line and (2) the far zone radiation fields of the coaxial waveguide antenna, with time harmonic excitation voltage. Complete characterization of the transient behavior is also found for (1) the fields interior to the feed line and (2) the radiated fields for excitation voltages arbitrary in their time dependence to the extent that kb,ka << 1. This corresponds to the case of a thin antenna and excitation voltage with a non-zero rise time, specifically chosen so that frequencies violating the restriction kb,ka << l are negligible. The transient radiation from the cylindrical monopole is developed in a closed analytic form which is relatively easy to interpret and apply. The expressions found offer an alternative to transient analysis by conventional methods requiring numerical techniques involving extensive computer calculations. They are also the basis for an uncomplicated procedure to synthesize a desired behavior of the transient radiation from cylindrical monopole antennas.

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