Abstract
In this chapter, a CPW-fed metamaterial-inspired antenna with asymmetrical bell-shaped ground is designed and investigated for wireless applications. The overall size of single-port antenna is 50 × 36 × 0.3 mm3 (0.32 λl × 0.2λl × 0.002λl, where, λl is at lowest cut-off frequency). The top layer of flexible FR-4 dielectric substrate contains an array of 3 × 4 Hilbert-shaped unit cells and asymmetrical bell-shaped partial ground. The proposed antenna offers impedance bandwidth of 1.92 GHz to 2.83 GHz, 3.22 GHz to 3.87 GHz and 5.4 GHz to 5.95 GHz (covering Wi-Fi/Wi-MAX/WLAN standards). Further, to combat the multipath fading or enhance the channel capacity, multiple-input multiple-output (MIMO) antenna with two elements is analyzed and tested. However, maintenance of isolation between antenna elements is another matter of concern. In view to this, a reverse T-shaped rectangular strip is placed exactly at the middle part of the substrate that inter-connects both bell-shaped CPW grounds. This greatly enhances the inter-port isolation between elements i.e. S21 ≤ − 17.5 dB over operating frequencies 1.92 GHz to 3.3 GHz and 4.6 GHz to 6 GHz (covering Wi-Fi/WLAN standards). Moreover, the measured and simulated results of the proposed 2-element MIMO radiator show good agreement with each other. Furthermore, simulated study of 4-element MIMO antenna with or without actual communication environment has also been analyzed and compared which inevitably makes the proposed antenna a suitable candidate for modern wireless applications.
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Acknowledgments
The authors would like to thank Thapar Institute of Engineering and Technology, Patiala, Punjab and Ms. HAMA IoT Solutions Private Limited, Sonbhadra, Uttar Pradesh (incubated at TIDES, IIT Roorkee under the scheme of DST NIDHI PRAYAS Project) for providing seed money grant as financial support to carry out this research.
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Kaur, H., Singh, H.S. (2022). A High-Isolated CPW-Fed Multi-Band Metamaterial Inspired MIMO Antenna for Wireless Applications. In: Narayan, S., Kesavan, A. (eds) Handbook of Metamaterial-Derived Frequency Selective Surfaces. Metamaterials Science and Technology, vol 3. Springer, Singapore. https://doi.org/10.1007/978-981-15-8597-5_19-1
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