This work introduces a class of electrically small resonators composed of a complementary split-ring resonator backed by a ground plane. The proposed structure has low profile, efficient for wide range of illumination angles and can be placed on metallic surfaces. An example unit cell was designed, optimized, and fabricated to resonate at around 5.8 GHz. It is shown through numerical simulations and laboratory measurements that the complementary split-ring resonator can efficiently deliver the incident power carried by an electromagnetic wave to a resistive load.
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