Abstract
Research on radio-wave propagation in tunnels has important applications for mobile and personal communications. This paper first briefly reviews radio-wave propagation in empty tunnels and then concentrates on characterizing radio-wave propagation in tunnels loaded with trains. For this purpose, an oversized imperfect periodically loaded rectangular waveguide is proposed, and the surface impedance approximation is adopted to formulate the problem. The theoretical results show that HEM/sub q,mn/ and TSM/sub q,m0/ modes can propagate. Meanwhile, why TSE/sub q,m0/ modes cannot exist is also proved. The closed-form propagation constants for those important TSM/sub q,m0/ modes are obtained. The numerical results for the propagation attenuation of the dominant TSM/sub 1,10/ are presented. The influence of passengers on propagation is discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
