and Mobile Computing (IWCMC), pp. 2090-2097, 2021. 34. Bigongiari, A., et al., "Integrated remote laser source for 6G advanced antenna systems," Journal of Lightwave Technology, vol. 40, no. 2, pp. 519-526, 15 Jan. 15, 2022. 35. Chi, N., Zhou, Y., Wei, Y., and Hu, F. "Visible light communication in 6G: advances, challenges, and prospects," IEEE Vehicular Technology Magazine, vol. 15, no. 4, pp. 93-102, Dec. 2020. 36. Gong, J., Liu, F., Wu, Y., Zhang, Y., Lei, S., and Zhu, Z. "Design of Raman Microstructure Fiber Amplifier for 6G," 2021 IEEE Wireless Communications and Networking Conference (WCNC), pp. 1-4, 2021. Taylor & Francis Taylor & Francis Group http://taylorandfrancis.com MIMO Antennas for loT and ISM Band Applications Inderpreet Kaur, Hari Kumar Singh, Sanjeev Sharma, Navneet Singh, and Yash Bhardwaj CONTENTS 11.1 Introduction Antenna Design Evolution of the Design of Compact 4-Port MIMO Antennas Discussion and Results 11.4.1 Scattering Parameters for MIMO Antennas 11.4.1.1 Reflection Coefficient 11.4.1.2 Z-Parameters 11.4.1.3 Antenna to Antenna Isolation 11.4.2 Far-Field Parameters for MIMO Antennas 11.4.2.1 3D Polar Plot 11.4.2.2 11.4.3 Performance Providing Parameters of MIMO Antenna 11.4.3.1 Envelope Correlation Coefficient and Diversity Gain 11.4.3.2 Efficiency 11.4.3.3 Total Active Reflection Coefficient 11.4.3.4 Voltage Standing Wave Ratio (VSWR) Performance Comparison Conclusion References 11.1 INTRODUCTION The Internet of Things will be authoritative, including a wide range of end systems, including smart homes, the engineering IoT, smart cities, smart agriculture, and smart networks. Aside from improved protocols of communication, antenna configuration will be a significant component related to smart devices that are node-end. Choosing the best antenna for work is an important planning task. Creating space for antennas is becoming a more difficult problem as IoT elements continue to become more DOI: 10.1201/9781003368311-11 5G Wireless Communication System in Healthcare Informatics compact, inte