Transient Radiation from Coaxial Waveguide and Cylindrical Monopole Antennas.
CALIFORNIA INST OF TECH PASADENA ANTENNA LAB
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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 much less than one. 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 much less than one are negligible. Modified author abstract
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