Monopole element at the center of a circular groundplane of arbitrary radius. Volume 1: Theory and results
Abstract
The Air Force SINCGARS VHFFM radio is a frequencyhopping antijam device utilizing electrically short antenna to minimize aerodynamic drag on airborne platforms. The development of optimally efficient, electronically tuneable antennas for this radio is of interest. Although the antenna groundplane is platformdependent, it is usually small compared to an rf wavelength. A circular groundplane provides a standardized geometry with which to model and evaluate candidate antennas. Accordingly, a VHF antenna range with an 8 ft. diameter circular groundplane has been constructed to evaluate candidate antennas. The electrical properties of a monopole element at the center of a circular groundplane of finite radius are of interest to this program for (1) qualifying the antenna range; (2) establishing antenna standards with which to measure test antennas; and (3) modeling candidate antennas. A survey of the literature revealed that although this antenna has the simplest geometry of any monopole antenna, its properties are neither well understood nor standardized, particularly for groundplane radii which are small or comparable to a wavelength. This paper attempts to address this deficiency.
 Publication:

Final Report Mitre Corp
 Pub Date:
 March 1986
 Bibcode:
 1986mitr.rept.....W
 Keywords:

 Aircraft Antennas;
 Amplification;
 Antenna Radiation Patterns;
 Circles (Geometry);
 Flying Platforms;
 Frequency Hopping;
 Frequency Modulation;
 Jamming;
 Monopole Antennas;
 Radii;
 Very High Frequency Radio Equipment;
 Wave Functions;
 Aerodynamic Drag;
 Armed Forces (United States);
 Electrical Properties;
 Geometrical Theory Of Diffraction;
 Impedance;
 Integral Equations;
 Method Of Moments;
 Standardization;
 Tuning;
 Communications and Radar