Simulations and Measurements of Wave Propagations in Curved Road Tunnels for Signals From GSM Base Stations

• Published in: IEEE transactions on antennas and propagation Vol. 54; no. 9; pp. 2577 - 2584
• Main Authors: WANG, Te-Shun, YANG, Chang-Fa
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.09.2006; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antennas; Applied sciences; Base stations; Curvature; Curved; Diffraction; Diffraction, scattering, reflection; Equipments and installations; Exact sciences and technology; Frequency; Geometry; GSM; Mobile communication; Mobile communications; Mobile radiocommunication systems; Parametric study; Performance evaluation; Radiocommunications; Radiowave propagation; ray tracing; Reflection; Roads; Simulation; Stations; Studies; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); tunnel; Tunnels (transportation); uniform theory of diffraction (UTD); Wave propagation; Mobile radiocommunication; GSM system; Parametric analysis; Electromagnetic wave diffraction; Base station; Wireless telecommunication; Data transmission; Mobile communication; Multiple reflection; Field distribution; Wave propagation; Electromagnetic wave propagation; Simulation; Mobile communications; Transmitting antenna; Ray tracing; uniform theory of diffraction (UTD); Transmission loss; tunnel
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2006.880674

This paper presents a ray-tube tracing method to simulate waves propagating in curved road tunnels from base stations for mobile communications. Ray tubes are traced by including multiple reflections in the curved tunnels and diffractions from wedges of the tunnel structures, together with the direct path. To verify this ray-tube tracing approach, field measurements of 900 MHz signals in two curved road tunnels from GSM base stations were performed for comparisons with the ray-tube tracing simulations. By tracing ray tubes reflected and diffracted from the curved structures of the tunnels, the effects of the curvature on wave propagations in large guiding structures can be evaluated. Good agreement between simulations and measurements has been obtained. A parametric study of the influence of the tunnel geometry and the signal frequency on the path loss is also presented by applying this ray-tube tracing method. Curved tunnels for different radii of curvature in the tunnel cross-section and horizontal plane and also lengths of the curved part are compared, together with rectangular tunnels. Simulations of the field distribution over the cross-section of the curved tunnel away from the transmitting antenna are demonstrated as well. The ray-tube tracing program can be applied to determine the deployment of the base-station antennas for improving signal coverage in tunnels, which may have curved structures