The resistive behaviour of a square Josephson junction array as a function of frustration f has been studied in detail. At f= 1/2 a very pronounced dip in resistance is found, other clear minima occur at f= 1/3, 1/5 and 1/10. For small values of f below 0.08, the resistance as a function of temperature shows thermally activated behaviour, for f > 0.08 this is not the case. At f = 1/2 the nonlinear resistance shows a temperature dependence which contains aspects of a Kosteditz-Thouless transition.
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