We report numerical and experimental investigations into modulation
instability in a nonlinear magnetoinductive waveguide. By numerical simulation
we find that modulation instability occurs in an electrical circuit model of a
magnetoinductive waveguide with third-order nonlinearity. We fabricate the
nonlinear magnetoinductive waveguide for microwaves using varactor-loaded
split-ring resonators and observe the generation of modulation instability in
the waveguide. The condition for generating modulation instability in the
experiment roughly agrees with that in the numerical analysis.Comment: 7 pages, 11 figure
