Title :
Theory and analysis of leaky coaxial cables with periodic slots
Author :
Wang, Jun Hong ; Mei, Kenneth K.
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, China
fDate :
12/1/2001 12:00:00 AM
Abstract :
Frequency band and coupling loss are the two important parameters of leaky coaxial cables with periodic slots. The frequency band can be predicted by analyzing the arrangement of the slots on the outer shield of the cable, but the coupling loss is not so easy to determine by classical methods. In this paper, the finite-difference time-domain (FDTD) method is used to calculate the electric field distribution in the slot cut in the outer conductor of the coaxial cable. The dyadic Green´s function is then used to calculate the radiation field of the equivalent surface magnetic current densities. By these two methods, the coupling losses of the leaky coaxial cables with different periods, sizes and shapes of the slots can be accurately obtained. Some results in this paper were verified by the experimental results of leaky coaxial cables designed for railway mobile communications with a frequency band of 100-500 MHz
Keywords :
Green´s function methods; UHF antennas; VHF antennas; antenna radiation patterns; coaxial cables; electromagnetic coupling; finite difference time-domain analysis; land mobile radio; leaky wave antennas; losses; periodic structures; railways; slot antenna arrays; 100 to 500 MHz; 900 MHz; FDTD; coupling loss; dyadic Green´s function; electric field distribution; equivalent surface magnetic current densities; finite-difference time-domain method; frequency band; leaky coaxial cables; outer conductor; outer shield; periodic slots; radiation field; railway mobile communications; Cable shielding; Coaxial cables; Conductors; Current density; Finite difference methods; Frequency; Green´s function methods; Power cables; Shape; Time domain analysis;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
