  We study the transmission and reflection of a plane electromagnetic wave
through a two dimensional array of rf-SQUIDs. The basic equations describing
the amplitudes of the magnetic field and current in the split-ring resonators
are developed. These yield in the linear approximation the reflection and
transmission coefficients. The polarization of the reflected wave is
independent of the frequency of the incident wave and of its polarization; it
is defined only by the orientation of the split-ring. The reflection and
transmission coefficients have a strong resonance that is determined by the
parameters of the rf-SQUID; its strength depends essentially on the incident
angle.
