2018 年 7 巻 4 号 p. 130-135
An electrically small metamaterial antenna is presented for ultra wide band applications. The proposed design provides a tunable frequency band with maximum efficiency and a bandwidth of approximately 7.7 GHz. Due to its compact size and simple structure, it can be employed in numerous wireless communication devices. The geometry of the antenna consists of a monopole ellipse radiator and a uniquely modified Electric LC (ELC) structure based on the concept of magnetic imaging at the boundary and provides dual frequency bands of 2.56∼3.68 GHz and 4.92∼6.82 GHz. The antenna is then fused with an Electromagnetic Band Gap (EBG) structure to increase impedance matching and provide an ultra wide band of 2.72 GHz to 10.46 GHz.
