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A coaxially fed dual-band electrically
small antenna based on double-negative metamaterials is presented in this
letter. The antenna consists of a microstrip patch antenna as driven element
and a double-negative metamaterials shell as parasitic element. Nearly complete
matching of the entire system to a 50 Ω source without any matching network is
achieved at 299 MHz and 837 MHz, with ka = 0.444 and 1.242 respectively.
Measured performance agrees with simulations, and the proposed antenna has
considerable radiation efficiency and is suitably employed for VHF and UHF applications.