  We solve the wave equation with periodically time-modulated material
parameters in a one-dimensional high-contrast resonator structure in the
subwavelength regime exactly, for which we compute the subwavelength
quasifrequencies numerically using Muller's method. We prove a formula in the
form of an ODE using a capacitance matrix approximation. Comparison of the
exact results with the approximations reveals that the method of capacitance
matrix approximation is accurate and significantly more efficient. We prove
various transmission properties in the aforementioned structure and illustrate
them with numerical simulations. In particular, we investigate the effect of
time-modulated material parameters on the formation of degenerate points, band
gaps and k-gaps.
