Artificial Transmission Line Loaded Dual-polarized Electrically Small Antenna for Wireless Applications

This paper describes the design of a tri-band and dualpolarized electrically small (ka = 0.44) antenna. The antenna is based on the artificial transmission line (ATL) metamaterial (MTM) structure for miniaturization purpose. Due to this, the proposed antenna obtains a compact dimension of 23.7 × 25 × 1.52 mm
³
with an electrical size of 0.09 λ
₀
× 0.10 λ
₀
× 0.006 λ
₀
at 1.23 GHz. The antenna exhibits triple-band behavior at 1.23 GHz (1.18-1.29 GHz), 4.25 GHz (3.56-4.94 GHz) and 7.76 GHz (6.33- 9.20 GHz) with a percentage impedance bandwidths (IBW) of 8.94%, 32.47% and 36.98% for the three bands. Also, the antenna provides circular polarization (CP) radiation at 4.10 GHz and 7.25 GHz with ARBW of 1.22% and 25.37% respectively. The antenna provides excellent IBW, dual AR bands, and good radiation performance by maintaining the antenna compactness. Hence, the intended antenna is appropriate for working in L, S, C and X-band applications.