Planar Metamaterial-Inspired Circular Ring Antenna With Neutralization Lines for Dual-Band Applications

Abstract

This chapter presents a simple, metamaterial-loaded planar ring antenna for WLAN/WiMAX applications. The proposed antenna is equipped with two neutralization lines to improve performance in the desired operating bands. The use of neutralization lines as conducting strip allows the antenna to function at the upper resonance-3.5GHz and the incorporation of complementary split ring resonator at the rear of the substrate benefits in the antenna's compact size. Due to the incorporation of a quarter wave transformer with a semicircular ring construction, the ring antenna produces better dual-band response. The upper resonance 3.5GHz is obtained due to the combination of tuned semicircular ring and circular ring along with the conducting strip in the structure. The fabricated antenna is printed on FR4 substrate with dimensions 10×10×1.6 mm3. The simulated results are verified by experimenting the fabricated antenna. It offered 14.6% bandwidth in the lower resonance 2.4 GHz and 8.5% bandwidth at upper resonant frequency 3.5GHz with radiation characteristics suitable for the WLAN/WiMAX applications.