Abstract
A compact metamaterial inspired antenna operate at LTE, Bluetooth and WiMAX frequency band is introduced in this paper. For the lower band, the design utilizes an outer square metallic strip forcing the patch to radiate as an equivalent magnetic-current loop. For the upper band, another magnetic current loop is created by adding metamaterial structure near the feed line on the patch. The metamaterial inspired antenna dimension of 42 x 32 mm(2) compatible to wireless devices. Finite integration technique based CST Microwave Studio simulator has been used to design and numerical investigation as well as lumped circuit model of the metamaterial antenna is explained with proper mathematical derivation. The achieved measured dual band operation of the conventional antenna are sequentially, 0.561 similar to 0.578 GHz, 2.346 similar to 2.906 GHz, and 2.91 similar to 3.49 GHz, whereas the metamaterial inspired antenna shows dual-band operation from 0.60 similar to 0.64 GHz, 2.67 similar to 3.40 GHz and 3.61 similar to 3.67 GHz, respectively. Therefore, the metamaterial antenna is applicable for LTE and WiMAX applications. Besides, the measured metamaterial antenna gains of 0.15-3.81 dBi and 3.47-3.75 dBi, respectively for the frequency band of 2.67 similar to 3.40 GHz and 3.61 similar to 3.67 GHz.