  We investigate theoretically the effect of the coupling radius on the
transfer function in 1D and 2D SQUID arrays with different number of Josephson
junctions in parallel and series at 77 K. Our results show a plateauing of the
array maximum transfer function with the number of junctions in parallel. The
plateauing defines the array coupling radius which we show increases with
decreasing the normalised impedance of the SQUID loop inductance. The coupling
radius is found to be independent of the number of junctions in series.
Finally, we investigate the voltage versus magnetic field response and maximum
transfer function of one 1D and two 2D SQIF arrays with different SQUID loop
area distributions.
