A.L. Buzov1, Yu.I. Kolchugin2, A.D. Krasilnikov3, A.I. Motorko4

1−3 JSC “SIP RS” (Samara, Russia)

4 Volga State University of Telecommunications and Informatics (Samara, Russia)

One of the most important tasks in providing radio communication systems is the development of a system for transmitting and relaying a radio signal along the tunnel. The use of traditional antenna-feeder devices often turns out to be ineffective, and the use of a radiating cable seems to be the most promising for organizing a continuous coverage of the entire area of a shielded object by a radio communication network. In this work, the transceiver characteristics of a radiating cable laid along the walls and ceiling of an insulated tunnel were studied.

As a result of the calculation, it was obtained that the approach of the radiating cable to the metal wall of the tunnel increases the transfer losses by 3-4 dB, it was also found that the location of the radiating cable along the ceiling of the tunnel degrades the radiating characteristics at a frequency of 230 MHz and practically does not affect 430 MHz.

The results of these studies can be used in the design of networks in long tunnels of mines and subways.

Buzov A.L., Kolchugin Yu.I., Krasilnikov A.D., Motorko A.I. Calculation of the attenuation of electric field strength in the long tunnel. Radiotekhnika. 2021. V. 85. № 7. P. 14−21. DOI: https://doi.org/10.18127/j00338486-202107-03 (In Russian)

1. Gromakov Ju.A. Standarty i sistemy podvizhnoj radiosvjazi. M.: Tehnologii jelektronnyh kommunikacij. 1996. 239 s. (In Russian).
2. Abo S.O.M. Propagation of electromagnetic waves in a rectangular tunnel. Appl. Math. And Comput. 2003. V. 136. № 2−3. P. 405–413.
3. Buzov A.L., Krasil'nikov A.D., Minkin M.A. i dr. Izluchajushhie kabeli RADIAX i voprosy ih primenenija. Vestnik SONIIR. 2002. № 1.  S. 19−23 (In Russian).
4. Delogne P. Electromagnetic propagation in tunnels. IEEE Trans. on Ant. and Prop. 1991. V. 39. № 3. P. 401−406.
5. Didascalou D., Maurer J., Wiesbeck W. Subway tunnel guided electromagnetic wave propagation at mobile communication frequencies. IEEE Trans. on Ant. and Prop. 2001. V. 49. № 11. P. 1590–1596.