  We introduce a chiral metamaterial with strong, non-resonant optical
activity, and very low polarization ellipticity. We achieve this by combining a
meta-atom and its complementary structure into a meta-molecule, resulting in
the coupling of magnetic and electric dipole responses. In contrast to either a
pair of crosses, or complementary crosses, this structure has low dispersion in
the optical activity at the transmission resonance. We also study the
excitation mechanism in this structure, and optimize the optical activity
through changing the twist angle.
