A compact metamaterial inspired UWB-MIMO fractal antenna with reduced mutual coupling
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TECHNICAL PAPER
A compact metamaterial inspired UWB-MIMO fractal antenna with reduced mutual coupling Mekala Harinath Reddy1 • D. Sheela2 • Vinay Kumar Parbot3 • Abhay Sharma4 Received: 6 July 2020 / Accepted: 30 August 2020 Ó Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This article focuses on metamaterial inspired UWB-MIMO fractal antenna. Antenna loaded with the metamaterial structure achieved an impedance bandwidth of 5.8–15 GHz (98.63%). Mutual coupling between the two radiating elements is obtained to be less than - 25 dB. The patterns of radiation are stable over the operating range and a peak gain of 6.2 dBi is obtained at 14 GHz. Throughout the operating range, the radiation efficiency is [ 88%. The obtained Envelope correlation coefficient-ECC (\ 0.07), Mean effective gain-MEG (\ 3 dB), Total active reflection coefficient-TARC (\ - 10 dB) and Diversity gain-DG ([ 9.98) proved that the desired antenna has a good diversity performance. The measured and simulated results are well adjusted, so that the antenna can be used for ultra-wide band applications. Simulation is conducted using HFSS simulation tool and printed on a 30 9 30 9 1.6 mm3 FR4 material.
1 Introduction Multi Input Multi Output (MIMO) technology is being widely used with the rapid development of wireless communication and its requirements for stable quality of transmission and high rate of transmission. For the transmission and reception of signals, MIMO antenna uses multiple antenna elements. Without increasing the transmitting power, MIMO technology will increase the capacity of the communication and the usage ratio of spectrum. The high data rate transfer requirements have rendered UWB technology a significant candidates to design portable devices for today’s wireless communications (El & Mekala Harinath Reddy [email protected] D. Sheela [email protected] Vinay Kumar Parbot [email protected] Abhay Sharma [email protected] 1
University of Leicester, Leicester, UK
2
Tagore Engineering College, Chennai, India
3
DMU University, Leicester, UK
4
Multimedia University, Cyberjaya, Malaysia
Hamdouni et al. 2020). Modern wireless device users are demanding for the devices that are suitable for both longand short-range transmission since the existing UWB systems are suitable for short range (El Hamdouni et al. 2020). Looking in to the older literatures on microstrip antenna, narrow bandwidth seems to be one of the disadvantages (Hota et al. 2020). After several researches, many techniques have been proposed to overcome this limitation. Out of several techniques proposed, most of the techniques focused on enhancing the bandwidth despite degrading the other parameters (Sivagnanam et al. 2019). So, techniques that enhances the bandwidth without degrading other parameters is most essential. UWB technology today has become an essential part due to its high bandwidth (Wu et al. 2018). In conventional UWB technology, multipath fading is a major pro
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