"Naotake Yamamoto,Taichi Sasaki,Atsushi Yamamoto,Tetsuya Hishikawa,Kentaro Saito,Jun-ichi Takada,Toshiyuki Maeyama","A Study on Path Loss Prediction Formula for IoT wireless system close to Concrete Ceiling with Flat Surface in 920MHz band","IEICE Technical Committee on Antennas and Propagation","IEICE Technical Report",,"Vol. 121","No. 126","pp. 49-54",2021,July