Propagation of Electromagnetic Waves in a Rectangular Tunnel
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Propagation of Electromagnetic Waves in a Rectangular TunnelAbstract
A study of radio communication in the underground metero tunnel of the city of Cairo, Egypt was carried out. A part of this tunnel was selected, which has a rectangular shape. Its dimensions are 8.85 m. wide, 5.9 m. height and 4.5 km. long. The walls are made of concrete which have conductivity between 10^-1 to 10^-2 mho/m. The attenuation below and above the cutoff frequency, both for the two values of σ are accounted for and graphically drawn. The results are plotted versus selected frequencies ranging between 30-300 MHz show the attenuation for TEmn and TMmn (m,n=0,1) modes. It is found that the attenuation constant for 30 MHz is smaller than for 300 MHz.
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