Electromagnetic Communication through Conducting Earth.
Abstract
The theoretical aspects of the design problems, relating to the tradeoffs between operating frequency, bandwidth, power, and antenna design, as functions of the medium properties and noise spectrum are considered in the report. First, the author obtains the idealized properties of and relations among such physically relevant quantities as the EM fields and power transfer functions for short dipole antennas, various noise powers, the optimum bandwidth allocation and its corresponding maximum optimum data rate capacity, minimum transmitting power, and error exponent for channel reliability. These are parameterized by the antenna configurations and media properties. Various important practical limiting effects, such as narrow band transmission, antenna tuning, and non-Gaussian atmospheric noise are then considered. Second, the author solves in detail analytically and numerically the case of short electric dipoles with matched loads in a uniform unbounded ground. Third, the author solves the similar case of small magnetic dipoles, and includes in addition a comparison with the electric dipoles, an estimate of the air-ground interface influence, and the effects of a ferromagnetic core.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1975
- Accession Number
- ADA035749
Entities
People
- Charles Tse Chin Mo