High-Gain Array Antenna Based on Composite Right/Left-Handed Transmission Line
Electromagnetic meta-materials are effectively homogeneous artificial structures engineered to provide electromagnetic properties not readily observable in nature, such as, an index of refraction that may be negative, less than one, or modulated in a graded manner. In this paper, a meta-material-inspired antenna with high gain and good directivity is designed. Based on the concept of Composite Right/Left-Handed Transmission Line (CRLH-TL), the proposed antenna is realized based on three leakage wave unit cell and a left handed circular ring slot incorporated on the surface. The maximum achievable gain at the resonant frequency of 5.6 GHz is 6.933 dBi and the return loss at 5.6 GHz can be - 20 db.