English

DTIC AD0407468: PERFORMANCE CHARACTERISTICS OF A SPACED LOOP ANTENNA FORMED BY TWO ARBITRARILY ORIENTED PARALLEL LOOPS

This report was prepared in order to make available in a single reference a complete listing of the important performance characteristics of the spaced loop antenna. The exact field equations of a general spaced loop are derived and used as a basis for all other performance characteristics. The coaxial spaced loop and coplanar spaced loop are treated as special cases of the general analysis. Any two loop spaced loop operating in the quadrupole mode may be treated as a special case. Field patterns are derived for near and far fields, for azimuth and elevation planes, and for both vertical and horizontal polarization, for any spaced loop. These results are plotted to show that certain spaced loops have pattern variations as a function of distance to the source. The field equations are then used to compute the radiation resistance, the effective height, effective area, gain, signal-to noise ratio, noise figure, minimum observable field strength and impedance. Other characteristics including reradiation error reduction, pattern variations with source distance, con struction difficulties and pattern distortion sources are reviewed. The report begins with very general concepts concerning

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