Pl. Overfelt, ELECTRIC LINES OF FORCE OF AN ELECTRICALLY SMALL DIPOLE-LOOP ANTENNA-ARRAY, IEEE transactions on antennas and propagation, 46(3), 1998, pp. 451-456
The electric Lines of force of an electrically small dipole-loop anten
na array have been determined analytically for both the near- and far-
fields of the array. It has been found that the behavior of the famili
es of electric contours are dependent upon a coupling parameter, which
is the ratio of the loop and dipole sizes and currents. This paramete
r also controls the appearance (or not) and position of the points of
equilibrium for the radiated field when analyzed in a real phase plane
. The electric lines of force of the dipole-loop array exhibit increas
ed directivity in the plane of the array when the coupling parameter i
s purely real, indicating that the respective dipole and loop currents
must be in phase quadrature for this effect to occur.