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A new transmitting antenna system for very low radio frequencies


Rusch, Willard Van Tuyl (1959) A new transmitting antenna system for very low radio frequencies. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/BXK9-YY23.


NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.

Recent widespread interest in very low-frequency radio propagation has increased the importance of developing adequate vlf transmitting systems. After briefly examining conventional vertical vlf antennas, a system is presented which employs resonant loading circuits to convert a section of an existing power line into a horizontal vlf transmitting antenna. The simplicity, low cost, and useful radiation pattern of this horizontal antenna are well suited for many experimental applications.

The theoretical antenna problem is solved using a normal mode expansion of the current distribution. A matrix method is developed to compute the current distribution of a thin, linear antenna loaded with lumped-circuit elements. The series is found to converge relatively fast. A digital computer is used to solve the matrix equations. Results are obtained for a full-wave linear antenna symmetrically loaded with real impedances [...], one half-wavelength apart. Current distributions, feedpoint impedances, radiation patterns, etc., are presented as functions of [...]. Results of the idealized problem are applied to the power-line antenna. The matrix method can also be extended to the general linear antenna with any type of loading or feeding.

System components and performance of the Dinkey Creek power-line antenna are described. The problem of interference with nearby audio-frequency communication systems is examined.

The 8.4 kc propagation experiments using the Dinkey Creek antenna are described. The series of whistler-mode propagations to probe the exosphere has not been completed. However, ionospheric soundings have yielded considerable information about the properties of the ionosphere at vlf. Successful long-distance propagation experiments are also described, and samples of the results are presented.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Electrical Engineering
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Macmillan, Robert Smith
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1959
Record Number:CaltechETD:etd-02172006-091240
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:655
Deposited By: Imported from ETD-db
Deposited On:21 Feb 2006
Last Modified:21 Dec 2019 03:54

Thesis Files

PDF (Rusch_wvt_1959.pdf) - Final Version
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