Resonances in one and two rows of triangular Josephson junction cells - art. no. 214510

We present an experimental and analytical study of resonances in the curren t-voltage characteristics of single and double row triangular Josephson arr ays. The magnetic-field dependences of the voltage positions of the resonan ces have been measured for various cell inductances and junction critical c urrents. In double row arrays, we have observed a peculiar resonance, whose voltage position decreases with magnetic field. We derive the spectrum of linear electromagnetic waves propagating in the arrays. In the double row a rray, the spectrum consists of many branches that differ by the behavior of the Josephson junctions transverse to the bias current direction. The meas ured magnetic-field dependence of the resonance voltages is mapped to the l inear mode spectrum and good agreement between experiments and model is fou nd.