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ON ELLIPTICALLY POLARIZED ANTENNAS IN THE PRESENCE OF GROUND
ARMY ELECTRONICS LABS FORT MONMOUTH N J
Pagination or Media Count:
The effect of ground reflections upon the far field of an elliptically polarized antenna of ar itrary orientation with r spect to ground is investigated. The equation of the polarization ellipse produced by an elliptically polarized antenna in the presence of ground is derived, AND SEVERAL EXAMPLES ILLUSTRATE THE VARIATION IN THE AXIS RATIO OF THE POLARIZATION ELLIPSE AS A FUNCTION OF THE GEOMETRY OF THE MEASURING SETUP. A method is presented which permits calculating the phase angle between the direct and the ground reflected component and their amplitude ratio from parameters accessible to measurement. It can be modified to permit separating the effects of the presence of ground from the radiation properties of the antenna itself when these properties are not known and cannot be measured in the absence of ground. Author
APPROVED FOR PUBLIC RELEASE