  We study the capacitance-coupled Josephson junction array beyond the
small-coupling limit. We find that, when the scale of the system is large, its
Hamiltonian can be obtained without the small-coupling approximation and the
system can be used to simulate strongly frustrated one-dimensional Ising spin
problems. To engineer the system Hamiltonian for an ideal theoretical model, we
apply a dynamical decoupling technique to eliminate undesirable couplings in
the system. Using a 6-site junction array as an example, we numerically
evaluate the system to show that it exhibits important characteristics of the
frustrated spin model.
