被动反射器,用于将超高频信号沿矿井或大型走廊的交叉通道延伸

R. A. Isberg, R. Chufo
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引用次数: 10

摘要

在室内进行的手持式2瓦超高频收发机与矿柱式石灰石矿间的通信试验表明,通过直线运输通道的通信距离可达数千英尺,但在与运输通道成直角进入交叉交叉处的通信范围相当有限。很明显,无线电收发机的辐射并没有被石灰石柱子反射到交叉的十字切口中。两个被动式铝反射器,每个四平方英尺安装在天花板附近,在主要运输方式和横切的交叉处与轴线呈45°角。通信的范围向下相交的横切是显着扩大。在同一矿井中对450和850兆赫的传播测量表明,被动反射器是将通信扩展到相交交叉点的一种实用和廉价的手段。用于微波无源反射器的公式和图也可用于超高频反射器的设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Passive reflectors as a means for extending UHF signals down intersecting cross cuts in mines or large corridors
Tests of communication between hand held two watt UHF transceivers in a room and pillar limestone mine were satisfactory for several thousand feet through straight haulage ways but the range of communication at right angles to the haulage way into intersecting cross cuts was quite limited. It was evident that the radiation from the transceivers was not being reflected by the limestone pillars into the intersecting cross cuts. Two passive aluminum reflectors, each four feet square were installed near the ceiling and positioned 45° with respect to the axis at an intersection of a main haulage way and a cross cut. The range of communications down the intersecting cross cut was significantly extended. Propagation measurements on 450 and 850 MHz in the same mine demonstrated that passive reflectors are a practical and inexpensive means for extending communications into intersecting cross cuts. The same formulae and nomograms which are used for microwave passive reflectors can be used for UHF reflector design.
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