小型化双向波束矿用定位终端天线设计
Design of miniaturized bidirectional beam antenna for mine positioning terminals
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摘要: 针对煤矿井下超宽带(Ultra Wide Band,UWB)人员精确定位无线终端设备,设计了一种小型化双向波束天线。通过布置两个间距为λ/4的U形单极子天线并在金属地板上引入U形缝隙结构,在保证整体结构紧凑的同时实现了双向边射波束辐射特性。天线整体尺寸为0.3×0.3×0.01λ3。仿真和实测结果表明:天线的-10dB带宽为1GHz(3.6GHz~4.6GHz),可有效覆盖当前煤矿井下UWB人员精确定位系统的工作频段(3.7~4.2GHz)。在3.6GHz~4.6GHz频段内,天线的峰值增益为2.2~2.5dBi,具有良好的幅频响应。该天线适用于各类矿用UWB小型化的精确定位终端设备。Abstract: A miniaturized bidirectional beam antenna is designed for the ultra-wide band (UWB) precise positioning of personnel in coal mines. By arranging two U-shaped monopole antennas with λ/4 spacing and introducing a U-shaped slit structure on the metal ground, the bidirectional beam radiation characteristics is realized while ensuring a compact overall structure. The overall size of the antenna is 0.3×0.3×0.01λ3. The simulation and measurement results show that the -10dB bandwidth of the antenna is 1GHz (3.6~4.6GHz), which can effectively cover the working band of the current UWB precise positioning system in coal mines(3.7~4.2GHz). The designed antenna has a good amplitude-frequency response with a peak gain of 2.2~2.5dBi during the frequency band from 3.6~4.2GHz. The proposed antenna is suitable for various UWB precise positioning terminal devices used in mining.
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