Propagation of a ground wave pulse around a finitely conducting spherical earth from a damped sinusoidal source current
- 1 January 1959
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Antennas and Propagation
- Vol. 7 (1) , 1-10
- https://doi.org/10.1109/TAP.1959.1144633
Abstract
The form of the transient electromagnetic ground wave which has been propagated over a finitely conducting spherical earth from a source current dipole can be calculated by a direct quadrature evaluation of the Fourier integral. The method is illustrated in this paper by a calculation of the transient field radiated by the particular case of the damped sinusoidal source current dipole. At short distances from the source, the earth was assumed to be a plane and the displacement currents in the earth were neglected. The pulse was then calculated by a direct evaluation of the Fourier integral and the integration was verified by special operational methods (inverse Laplace transformation). The form of this pulse was then predicted at great distance from the source by a direct evaluation of the Fourier integral in which the displacement currents in the earth and the earth's curvature were introduced into the Fourier transform. The form of the transient signal was found to be dispersed by the propagation medium. The most noteworthy attribute of this dispersion is a stretching of the period of the wave so that the form of the source is somewhat obscured by the filtering action of the medium.Keywords
This publication has 15 references indexed in Scilit:
- Propagation of electromagnetic pulses around the earthIEEE Transactions on Antennas and Propagation, 1958
- Radiation Resulting from an Impulsive Current in a Vertical Antenna Placed on a Dielectric GroundJournal of Applied Physics, 1957
- Abscissas and weights for Gaussian quadratures of high orderJournal of Research of the National Bureau of Standards, 1956
- The Calculation of Ground-Wave Field Intensity over a Finitely Conducting Spherical EarthProceedings of the IRE, 1941
- The Physical Reality of Space and Surface Waves in the Radiation Field of Radio AntennasProceedings of the IRE, 1937
- The Propagation of Radio Waves over the Surface of the Earth and in the Upper AtmosphereProceedings of the IRE, 1937
- XIII.The diffraction of electromagnetic waves from an electrical point source round a finitely conducting sphere, with applications to badiotelegraphy and the theory of the rainbow.— Part IJournal of Computers in Education, 1937
- The Propagation of Radio Waves over the Surface of the Earth and in the Upper AtmosphereProceedings of the IRE, 1936
- The diffraction of electric waves by the earthProceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1918
- Über die Ausbreitung der Wellen in der drahtlosen TelegraphieAnnalen der Physik, 1909