Abstract
In this article, an antenna with the combination of the microstrip slot and Yagi antenna is presented for wideband WLAN (wireless local area network) using CRLH (composite right/left-handed) as a metamaterial (Left-hand) element. The T-shape feed line is investigated as a radiator section and modified for enhancing the bandwidth. The periodic elements are utilized as a novel type of the director to improve the bandwidth to more than 35% and increase the gain of the antenna to more than 80% where the three CRLH elements array are employed as the director of the Yagi antenna. The proposed antenna covers the 2.2 to 8 GHz (113% bandwidth) with a return loss of less than −6 dB (VSWR less than 3), which makes it suitable for wireless applications for covering different bands including WLAN, LTE (Long Term Evolution), and WiMAX with 47% miniaturization. The final antenna is simulated with CST microwave studio by the time-domain method of FIT (Finite integration technique). The total size of the antenna is 60 mm × 40 mm × 1.6 mm, which is printed on an FR-4 substrate, and the experimental results confirm the simulations.
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