Ma. Jensen et Y. Rahmatsamii, CHARACTERIZATION OF ELECTROMAGNETICALLY COUPLED SUPERQUADRIC LOOP ANTENNAS FOR MOBILE COMMUNICATIONS APPLICATIONS, IEE proceedings. Microwaves, antennas and propagation, 141(2), 1994, pp. 85-93
Analysis of two mutually coupled loop antennas with arbitrary relative
orientation and position and possibly different geometries is present
ed. The antennas are represented by generalised superquadric curves, w
hich include circular, elliptical, and rectangular loop geometries, an
d they may be located either in a homogeneous region or next to an inf
inite ground plane. A Galerkin-type moment method with piecewise sinus
oidal subsectional basis and weighting functions is used. Special cons
ideration is given to implement the solution using curved wire segment
s instead of the commonly employed linear segments to improve computat
ional efficiency. This very general computational tool is used to inve
stigate the behaviour of coupled loops in configurations suitable for
personal communications applications. A discussion of the use of anten
na diversity to increase the received signal-to-noise ratio for commun
ications equipment used in a multipath fading environment is also pres
ented. Computational examples show that antenna diversity can provide
significant improvements even for closely spaced loop antennas used in
mobile communications applications.