Tunnel wall structure for reducing strong reflection propagation multipath effect of millimeter waves
A multipath effect and design method technology, applied in tunnels, mining equipment, earthwork drilling and mining, etc., to achieve the effects of reducing delay expansion, reducing multipath fading, and reducing strong multipath effects
Inactive Publication Date: 2012-11-21
TONGJI UNIV
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However, the cost of deploying absorbing materials on the entire tunnel wall is high, and the design and construction are difficult
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[0053] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0054] See figure 1 As shown, the tunnel wall structure provided by the present invention for reducing the multipath effect of strong reflection and propagation of millimeter waves includes a tunnel wall body 10 and a wave-absorbing belt 30 . The main body 10 of the tunnel wall is made of ordinary materials, and the millimeter-wave absorbing material is only coated on a small area where strong reflection multipath effects occur, so that a small ring-shaped absorbing band 30 formed is embedded in the tunnel wall 10 .
[0055] The above absorbing band 30 is used to absorb the millimeter wave incident wave 21 emitted by the base station antenna 20, which obviously reduces the strong multipath effect caused by the reflected wave 22 and the incident wave 21, especially eliminates the occurrence of the primary reflected wave 22 with the strongest amplitu...
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The invention relates to a tunnel wall design method for reducing the strong reflection propagation multipath effect of millimeter waves, which is characterized by comprising: determining an area which may generate strong reflection propagation multipath effect of millimeter waves on the tunnel wall, setting a wave absorbing band embedded in the area, and coating the millimeter waves absorbing material on the absorbing band. Since the wave absorbing band is coated on the tunnel wall, the wave absorbing band absorbs millimeter wave incident waves, and obviously reduces the strong multipath effect caused by reflected waves and the incidents waves so as to reduce the multipath fading and delay spread caused by strong reflection and obviously improve communication channel characteristics. Since a small section of region in which strong multi-path fading occurs is coated with the wave absorbing material, the material and construction costsare obviously reduced, and simultaneously the implementation is simple and convenient, the installation strength is reduced, and the impact of tunnel wall absorbing treatment on the installation of other functional facilities of tunnels can be prevented.
Description
technical field [0001] The invention relates to a design method of a tunnel wall structure, in particular to a design method of a tunnel wall for reducing the multipath effect of millimeter wave strong reflection propagation. Background technique [0002] Millimeter waves are electromagnetic waves with a wavelength of 10 to 1 millimeter. At present, there are few studies on the propagation laws of millimeter waves in limited spaces at home and abroad, because there is no real millimeter wave system used in tunnels. Most of the research frequency bands on radio propagation in tunnels are concentrated below 5GHz; although the German maglev trains use 38GHz millimeter waves to build communication systems, there are no technical methods and technical specifications for communication in tunnels. [0003] The main technical methods for the propagation of low-frequency electromagnetic waves below 5 GHz in tunnels include avoiding the cut-off characteristics of tunnels by selectin...
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IPC IPC(8): E21D9/00G10K11/168
Inventor 谈长青虞翊王绍银陈峙郑国莘赵恒凯符玮玮卫慧张立
Owner TONGJI UNIV