Summary: Elimination of the E ects of Mutual Coupling
in an Adaptive Nulling System with a Look
R.S. Adve and T.K. Sarkar
Department of Electrical and Computer Engineering,
Syracuse University, Syracuse, NY 13244.
Gupta and Ksienski 1] demonstrate that the mutual coupling between the
elements of an adaptive array causes signi cant degradation in the signal-
to-interference-plus-noise ratio (SINR). The mutual coupling also slows the
response of the array. To compensate for the e ect of mutual coupling, they
obtain a simple matrix equation to relate the open circuit voltages and the
actual voltages at the ports of the array. They suggest that the open circuit
voltages are free of mutual coupling.
Gupta and Ksienski nd the open circuit voltages using a model of a set
of equispaced, identical, centrally fed dipoles. However, these voltages found
at the ports of the array are the voltages in the presence of the other, open
circuited, elements. This implies that the e ect of mutual coupling is re-
duced, but not eliminated. The array may also be in the presence of near
eld scatterers which would cause large distortions in the measured signals.