A novel planar metamaterial based dual band antenna for WLAN and WIMAX application is reported. The antenna consists of two metamaterial structures (i.e. Square Complementary Split Ring Resonator (SCSRR) and circular Split Ring Resonator (SRR)) and a rectangular stub as the radiating part. The specialty of the proposed metamaterial structure is that each metamaterial unit cell independently controls a particular band. The extraction of medium parameters through waveguide set-up is elaborated in detail. The antenna has a very compact dimension of 0.24λ1 × 0.21λ1× 0.03λ1 (20× 18× 2.54 mm3 at a lower frequency of 3.6 GHz, with |S11|<−10 dB bandwidth of about 2.57% (3.42–3.51 GHz) and 6.38% (5.61–5.98 GHz). Stable radiation pattern, good impedance matching and radiation efficiency more than 95% are noticed across the targeted bandwidth of the antenna.
In this paper, a printed Yagi-Uda antenna of the dimension 30 × 30 mm 2 with parameter enhancing techniques are presented. The focus is towards gain enhancement and achieving best matched condition. The proposed structure has a fractional bandwidth of 9.03% (4.3075-4.7152 GHz), 7.86% (5.5-5.95 GHz) in simulation and 12.15% (4.25-4.8 GHz), 8.92% (5.35-5.85 GHz) in measurement respectively. It has linearly increasing gain over its entire operational bandwidth and has a simulated peak gain of 3.7 dB at 4.5 GHz and 6.62 dB at 5.8 GHz. This antenna has the advantage of simple configuration, high gain and directivity and is intended to be used for wireless applications in 4.5 GHz and 5.8 GHz bands. These analyses resulted in stable performance which is very much required from a commercially viable antenna. All the necessary antenna simulations are simulated using Ansys HFSS and is validated by fabricating a model of it. The circuit analysis is also carried out on NI AWR Design Environment.
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