Coplanar waveguide-fed electrically small dual-polarized short-ended zeroth-order resonating antenna using ω-shaped capacitor and single-split ring resonator for GPS/WiMAX/WLAN/C-band applications

This work explains the design and analysis of a triple-band electrically small (ka = 0.56 < 1) zeroth-order resonating (ZOR) antenna with wideband circular polarization (CP) characteristics. The antenna compactness is obtained due to ZOR frequency of composite right/left-handed (CRLH) transmission line (TL) and wideband CP radiation are achieved due to the introduction of single-split ring resonator and asymmetric coplanar waveguide fed ground plane. The proposed antenna obtains an overall electrical size including the ground plane of 0.124 lambda(0) x 0.131 lambda(0) x 0.005 lambda(0) at 1.58 GHz and physical dimension of 23.7 x 25 x 1 mm(3) are achieved. The antenna provides a size reduction of 44.95% compared to a conventional monopole antenna. The novelty behind the ohm-shaped capacitor is the generation of extra miniaturization with better antenna compactness. The antenna provides dual-polarized radiation pattern with linear polarization radiation at 1.58 and 3.54 GHz, wideband CP radiation at 5.8 GHz. The antenna measured results shows good impedance bandwidth of 5%, 6.21%, and 57.5% for the three bands centered at 1.58, 3.54, and 5.8 GHz with a wider axial ratio bandwidth (ARBW) of 25.47% is obtained in the third band. The antenna provides a higher level of compactness, wider ARBW, good radiation efficiency, and wider S-11 bandwidth. Hence, the proposed antenna is suitable for use in GPS L1 band (1.565-1.585 GHz), WiMAX 3.5 GHz (3.4-3.8 GHz) GHz, WLAN 5.2/5.8 GHz (5.15-5.825 GHz), and C-band (4-8 GHz) wireless application systems.