Quad-Band Electrically Small Dual-Polarized ZOR Antenna with Improved Bandwidth using Single-Split Ring Resonators and Spiral Slots Enabled with Reflector for GPS/UMTS/WLAN/WiMAX Applications

An electrically small quad-band metamaterial (MTM) antenna based on the short-ended configuration of zeroth order mode (ZOR) added with a reflector unit cell presented in this paper. The antenna is highly miniaturized due to the ZOR mode and the addition of the CPW backed ground plane. The intended antenna electrical size is 0.094 λ
₀
× 0.112 λ
₀
× 0.006 λ
₀
at 1.54 GHz and a physical dimension of 18.5 × 22 × 1.27 mm
³
. A bandwidth of 3.89%, 10.11%, 13.48%, and 30.76% is acquired for the four bands centered at 1.54 GHz, 2.57 GHz, 3.48 GHz, and 5.33 GHz and a CP bandwidth of 8.32% is obtained in the fourth band. Moreover, the antenna exhibits a good level of compactness, good axial ratio, good radiation efficiency, and acceptable S
₁₁
bandwidth. The intended antenna is the best candidature for use in 1.5 GHz GPS L2 band, 2.6 GHz UMTS, 5.2/5.8 WLAN, and 3.3/3.6 WiMAX applications.