圆形隧道中被导电磁波传输衰减的频率特性_刘会丽.pdf

29 5 Vol. 29 No. 5 2004 10 JOURNAL OF CHINA COAL SOCIETY Oct. 2004 :0253- 9993(2004) 05- 0630- 05 1 2 3 刘会丽 , 魏占永 , 孙继平 ( 11 , 300130; 21 , 300130; 31 ( ) , 100083) : 给出了波导波模方程单线波模方程和双线波模方程, 并利用数值分析方法求解, 得出 有关结论, 即单线波模由于受 道壁影响在衰减频率特性曲线上出现了峰值点, 双线波模的场基 本上分布在两导线之间和周围较小的范围内, 衰减率随频率单调增加. : 圆形遂道; 被导电磁波; 衰减; 频率特性 : O44114 : A Frequency characteristic of transmitted attenuation of guided electromagnetic wavesin circular tunnel 1 2 3 LIU Hui-li , WEI Z an-yong , SUN J-i ping ( 11 School of Theory, Hebei University of Technology, Tianjin 300130, China; 21ElectricApparatus Institute, Hebei University of Technology, Tianjin 300130, China; 31Research Institute of Inf or ation Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China) Abstract: Wave guide mode equation and monofilar mode equation and bifilar mode equation were expressed, and t roug numerical met od t e solutions of mode equation were obtained1 T e conclusions are t at attenuations frequency c aracteristic curves of monofilar mode as peaks point owing to loss arose by tunnel wall, and t at t e field of bifilar mode distributes between line and line and at t e little space around t e lines, attenuations rate rises monotonously wit t e frequency increasing1 Key words: circular tunnel; guided electromagnetic waves; attenuations rate; frequency c aracteristic ( ) [ 1] . , . 1 , , . ; 1 , ; 2 , ; 2 , 3 . 111 a