An efficient metamaterial-inspired, electrically small antenna for ISM band applications

In this study, an electrically small, monopole slot antenna based on near-field resonant parasitic (NFRP) elements composed of metamaterial inspired capacitively loaded loop (CLL) elements is designed and analyzed via a commercial full wave electromagnetic solver. The proposed antenna has an operational frequency of 2.4 GHz and it satisfies the limits of an electrical small antenna (ESA) having a ka value of 0.88. The antenna has a very high efficiency with an overall efficiency value of 95%. The directivity and the gain of the proposed antenna are 1.7 dB and 1.45 dB, respectively.