NDLI: Radio coverage of road tunnels at 900 and 1800 MHz by discrete antennas

Content Provider	IEEE Xplore Digital Library
Author	Klemenschits, T. Bonek, E.
Copyright Year	1994
Description	Author affiliation: Inst. fur Nachrichtentech. und Hochfrequenztech., Tech. Univ. Wien, Austria (Klemenschits, T.; Bonek, E.)
Abstract	Cellular network operators are greatly interested in radio propagation in tunnels and other wave guiding structures. Road tunnels are commonly served by leaky feeders to provide VHF radio coverage. For UHF and up, we present an attractive alternative to this solution, using discrete antennas in- or outside the tunnel, depending on the tunnel's length. The key to coverage predictions is a "critical distance", after which higher-order modes excited near the antenna have died out. This distance depends on tunnel cross-section dimensions and wavelength. A propagation model using this critical distance can predict power level versus length for distances larger than the critical one (e.g. 300 m for 900 MHz in a Euro-standard dual-lane tunnel). Two reference measurements are needed as input for the prediction. Validation measurements taken in a dual-lane road tunnel at 900 and 1800 MHz showed the prediction to be useful at various traffic rates. Traffic does not significantly hamper propagation, if only the vehicles leave enough space in the cross section, nor do bends with curvature radii commonly used in motorway tunnels.
Starting Page	411
Ending Page	415
File Size	506784
Page Count	5
File Format	PDF
ISBN	9051991932
DOI	10.1109/WNCMF.1994.529121
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-09-18
Publisher Place	Netherlands
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Roads Antennas and propagation Predictive models Wavelength measurement Telecommunication traffic Cables Dielectrics Cutoff frequency Traffic control Rough surfaces
Content Type	Text
Resource Type	Article

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