Patent ID: 7847739

Claim:
An antenna device, comprising: a substrate having a first surface on a first side and a second surface on a second side opposite to the first side; a ground electrode formed on the first surface leaving part of the first surface exposed to have an exposed surface part; a composite left and right handed (CRLH) metamaterial structure comprising: (i) one or more unit cells including at least a portion of the exposed surface part, and (ii) one or more conductive strips formed on the first surface and coupling the one or more unit cells to the ground electrode; and a feed line formed on the second surface having a distal end capacitively coupled to the CRLH metamaterial structure and directing an antenna signal to or from the CRLH metamaterial structure; wherein the CRLH metamaterial structure and the feed line are configured to exhibit one or more left handed (LH) resonant modes and one or more right handed (RH) resonant modes associated with the antenna signal.