COMPUTATIONS OF THE ANTENNA CUT-BACK FACTOR FOR LF RADIO WAVES.
NATIONAL BUREAU OF STANDARDS BOULDER CO CENTRAL RADIO PROPAGATION LAB
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There are several methods for evaluating the cut-back factor of geometric optics, e. g., the flat-earth approximation, the contour integral, and the residue series summation methods. Wait and Conda give quite extensive details of the theory of these three methods in their 1958 paper, and Johler 1961, 1962 elaborates even further. In this paper each of the above mentioned methods is investigated, and calculations are made for various frequencies and distances. The frequencies used are primarily LF however, frequencies up to 1 Mcs are considered. Several conductivities and dielectric constants are used, varying from sea water to typical earth. The permittivity lapse factor is varied from 0.75 to 1.0 with most of the computations being done for 0.75 and 0. 85. Only calculations for vertical electric polarization were carried out. Author
- Radiofrequency Wave Propagation