Dual Band CRLH Metal Antenna for WLAN Applications
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Dual Band CRLH Metal Antenna for WLAN Applications Maruti Tamrakar1 · Usha Kiran Kommuri1 Accepted: 14 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A composite right/left handed (CRLH) metamaterial antenna is proposed in this paper. The antenna is designed for WLAN IEEE 802.11 standard; where bands 2.4 GHz usage frequency 2401–2495 MHz and 5 GHz usage frequency 5170–5875 MHz worldwide. A composite right left handed metamaterial has combined effect of right handed and left handed metamaterial and which creates dual band resonance in the antenna. By providing shorting pin loading at edge of the radiating metal, the left handed metamaterial property is created in the antenna. The antenna occupies rectangular area of 38.2 × 29.1 mm2 and 6 mm air gap from ground plane. The return loss of −10 dB is achieved over the bandwidth with promising peak gain of 2.3 dBi and 8.6 dBi for 2.4 GHz and 5 GHz band, respectively. The antenna is fabricated, and measured values are closely matching with simulation results. The proposed antenna has orthogonal radiation patterns and maximum efficiency of 84.2% and 90.3% for dual frequencies. Keywords Composite right left hand (CRLH) · Metamaterial · Metal Antenna · Gain · Radiation characteristics
1 Introduction Last few years have been continuous growth in the usage of metamaterial (MTM) antenna to mitigate the challenges like multiband, miniaturization, better performance, low cost, and easy integration. The MTM structure/medium shows unique properties of electromagnetics like negative value of electric permittivity and magnetic permeability, which called as left handed MTM (LHM) and in case, both values are positive then structure/medium is called as right handed structure/medium (RHM). It is very difficult to achieve pure left handed designs, but LH properties can be combined with RH. The structure with combined properties of LHM and RHM, is called as composite right/left handed (CRLH) MTM. The per unit length, transmission line (TL) model of CRLH structure consists of series inductor, shunt capacitor, series capacitor and shunt inductor. The transmission line (TL) based MTM loading is popular these days to provide effective solutions for antenna design challenges [1]. By loading negative refractive index (NRI) * Maruti Tamrakar [email protected] 1
Vellore Institute of Technology, SENSE, Chennai 600127, India
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M. Tamrakar, U. Kiran Kommuri
TL MTM, the multiband frequency response is shown in printed dipole antenna [2] and in monopole [3, 4] and NRI TL MTM loading is also presented in [5] to design broad band dual-mode antenna. The TL based on CRLH solutions reported antenna size reduction and multimode operation. The CRLH MTM loading helps in improving the impedance matching and antenna radiates at multiband, giving wideband radiation [6, 7]. CRLH based dualpolarized dual band antennas are presented in [8–10]. In [11], a pin loading technique is presented to miniaturize antenna and get dual
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