1. Yang, S., "Development trend of intelligent underground mining of coal mine," Inner Mongolia Coal Economy, Vol. 3, 160-162, 2023.
2. Shen, X., C. Liu, and N. Kong, "Research on the technical development status of the intelligent mine base on internet of things," China Mining Magazine, Vol. 27, No. 7, 120-125, 2018.
3. Ma, Long, "Study on intelligent mine based on the application of 5G wireless communication system," IOP Conference Series: Earth and Environmental Science, Vol. 558, No. 3, 032050, 2020.
4. Huang, L., "Application of intelligent safety monitoring system in mining engineering," China Metal Bulletin, Vol. 1, 29-31, 2023.
5. Hu, H. Z., Z. G. Du, Nan Chu, et al. "Key technologies of personnel positioning system based on smart mining platform," Coal Mine Safety, Vol. 152, 134-138, 2021.
6. Farjow, Wisam, Kaamran Raahemifar, and Xavier Fernando, "Novel wireless channels characterization model for underground mines," Applied Mathematical Modelling, Vol. 39, No. 19, 5997-6007, 2015.
7. Issa, Ali, Nadir Hakem, and Nahi Kandil, "Combining leak feeder cable and antenna to support mobile network in underground mine environment," 2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting, 1133-1134, Montreal, QC, Canada, 2020.
8. Peng, Zhangyou, Linxiao Li, Miao Wang, Zhonghao Zhang, Qi Liu, Yang Liu, and Ruoran Liu, "An effective coverage scheme with passive-reflectors for urban millimeter-wave communication," IEEE Antennas and Wireless Propagation Letters, Vol. 15, 398-401, 2015.
9. Shen, Junyang, Dengkui Zhu, Boyu Li, and Ping Liang, "Repeater-enhanced millimeter-wave systems in multi-path environments," 2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 769-774, Hong Kong, China, 2015.
10. Li, Long, Qiang Chen, Qiaowei Yuan, Kunio Sawaya, Tamami Maruyama, Tatsuo Furuno, and Shinji Uebayashi, "Frequency selective reflectarray using crossed-dipole elements with square loops for wireless communication applications," IEEE Transactions on Antennas and Propagation, Vol. 59, No. 1, 89-99, 2011.
11. Raspopoulos, Marios and Stavros Stavrou, "Frequency selective buildings through frequency selective surfaces," IEEE Transactions on Antennas and Propagation, Vol. 59, No. 8, 2998-3005, 2011.
12. Ha, Dohyuk, Dongkyu Choi, Hyunjin Kim, JunSig Kum, Jungyub Lee, and YoungJu Lee, "Passive repeater for removal of blind spot in NLOS path for 5G fixed wireless access (FWA) system," 2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2049-2050, San Diego, CA, USA, 2017.
13. Kim, Byungchul, Hyunjin Kim, Dongkyu Choi, Youngju Lee, Wonbin Hong, and Jeongho Park, "28 GHz propagation analysis for passive repeaters in NLOS channel environment," 2015 9th European Conference on Antennas and Propagation (EuCAP), 1-4, Lisbon, Portugal, Apr. 2015.
14. Zhou, Min, Oscar Borries, and Erik Jørgensen, "Design and optimization of a single-layer planar transmit-receive contoured beam reflectarray with enhanced performance," IEEE Transactions on Antennas and Propagation, Vol. 63, No. 4, 1247-1254, 2015.
doi:10.1109/TAP.2014.2365039
15. Li, Long, Qiang Chen, Qiaowei Yuan, Kunio Sawaya, Tamami Maruyama, Tatsuo Furuno, and Shinji Uebayashi, "Novel broadband planar reflectarray with parasitic dipoles for wireless communication applications," IEEE Antennas and Wireless Propagation Letters, Vol. 8, 881-885, 2009.
16. Yu, Nanfang and Federico Capasso, "Flat optics with designer metasurfaces," Nature Materials, Vol. 13, No. 2, 139-150, 2014.
17. Tang, Wenxuan, Jia Chen, and Tie Jun Cui, "Metamaterial lenses and their applications at microwave frequencies," Advanced Photonics Research, Vol. 2, No. 10, 2100001, 2021.
18. Liu, Lixiang, Xueqian Zhang, Mitchell Kenney, Xiaoqiang Su, Ningning Xu, Chunmei Ouyang, Yunlong Shi, Jiaguang Han, Weili Zhang, and Shuang Zhang, "Broadband metasurfaces with simultaneous control of phase and amplitude," Advanced Materials, Vol. 26, No. 29, 5031-5036, 2014.
doi:10.1002/adma.201401484
19. Yi, Hao, Jiaqi Han, Xiangjin Ma, Long Li, and Tie Jun Cui, "Shaping flattened scattering patterns in broadband using passive reconfigurable intelligent surfaces for indoor NLOS wireless signal coverage enhancement," ITU Journal on Future and Evolving Technologies, Vol. 4, No. 1, 50-59, 2023.
doi:10.52953/OXLX7838
20. Guo, Tianhao, Yujie Wang, Lexi Xu, Muyu Mei, Jia Shi, Lei Dong, Yongjun Xu, and Chongwen Huang, "Joint communication and sensing design for multihop RIS-aided communication systems in underground coal mines," IEEE Internet of Things Journal, Vol. 10, No. 22, 19533-19544, 2023.
21. Xue, Hao, Zeqing Lu, Xiangjin Ma, Zhiding Wang, Lihao Zhu, Shuyao Yue, Jiaqi Han, Haixia Liu, and Long Li, "A reconfigurable metasurface enhancing signal coverage for wireless communication using reduced numbers of p-i-n diodes," IEEE Transactions on Microwave Theory and Techniques, Vol. 72, No. 3, 1964-1978, 2024.
22. Wu, Geng-Bo, Shi-Wei Qu, Shiwen Yang, and Chi Hou Chan, "Broadband, single-layer dual circularly polarized reflectarrays with linearly polarized feed," IEEE Transactions on Antennas and Propagation, Vol. 64, No. 10, 4235-4241, 2016.