An estimation method of the 4-port S-parameters used for the E-MIMO approach  

作　　者：Jintai Wu Qiaowei Yuan Takayuki Okada Bo Yang 

机构地区：[1]Tohoku Institute of Technology,Sendai,Japan [2]Murata Manufacturing Co.,Ltd,Japan [3]Kyoto University,Kyoto,Japan

出　　处：《Space Solar Power and Wireless Transmission》2024年第3期148-151,共4页空间电力与无线传输(英文)

摘　　要：This paper investigates a novel method for deriving 4-port S-parameters for the E-MIMO approach.In this method,only the self-S-matrices of the transmitting antennas(S_(TT))and receiving antennas(S_(RR))need to be pre-calculated or measured.The coupling matrix(S_(RT)orS_(TR)),which depends on the position of the receiving element,can be estimated using the proposed simplified method.Since the receiving antenna is positioned in the far-field,the Friis transmission formula is applied to estimate the amplitude of the elements in the coupling matrix(S_(RT)orS_(TR)),while the array factor is used to estimate the phase of these elements.The S-matrices for a 3×1 array,obtained through conventional simulation,measurement,and the proposed estimation method,are compared.Furthermore,these matrices are applied to E-MIMO to compare their radiation patterns and power transmission efficiencies.The results demonstrate that the proposed estimation method achieves radiation patterns and power transmission efficiencies that are closely comparable to those obtained using the conventional method,confirming the effectiveness of the proposed method.

关 键 词：BEAMFORMING E-MIMO S-PARAMETER Wireless Power Transmission(WPT) 

分 类 号：TN9[电子电信—信息与通信工程]