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首页> 外文会议>European Conference on Antennas and Propagation >A technique to narrow down radiation patterns of broad beam antenna operationally and its application to security gate to prevent shoplifting based on monopulse system
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A technique to narrow down radiation patterns of broad beam antenna operationally and its application to security gate to prevent shoplifting based on monopulse system

机译：一种窄梁天线的辐射图案的技术及其在安全门的应用，防止基于Monopulse系统的入库

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Antennas for use of security gates to prevent the shoplifting have been researched and developed based on the monopulse system at 920 MHz. Because the radiation patterns of the conventional antenna with the security gates are not enough sharp, many false operations are pointed out to recognize the RF-tags located far from the security gates. Ideas for using large antennas or radio wave absorbers were however rejected from the ladies' apparel shops because the security gate became large and the entrance became unlovely. In this paper, a technique to narrow down the radiation patterns of the antenna operationally was proposed while keeping antenna size to be small. The main emphasis was placed on the analog signal processing using the monopulse system having antennas with broad radiation patterns. The sensitivity of arrival angle detection from the RF-tags was newly defined and it was evaluated using the microstrip patch antenna pair with a half power beam width of 150o as a function of the antenna pair distance. From the numerical and experimental investigations, it was obvious that the antenna pair distance from fortieth part to tenth part of a free space wavelength guaranteed the narrow beam operation to be less than the range of the arrival angle of 10°.
机译：用于使用安全门以防止入店手术的天线基于920 MHz的Monopulse系统进行了研究和开发。因为传统天线的传统天线的辐射模式是不够的，所以指出许多错误操作以识别远离安全门的RF标签。然而，使用大型天线或无线电波吸收剂的想法是从女士服装店拒绝，因为安全门变大，入口变得不可或众。在本文中，提出了一种技术来缩小天线的辐射图案，同时保持天线尺寸较小。主要强调使用具有具有宽辐射图案的天线的Monopulse系统置于模拟信号处理上。从RF标签到达角度检测的敏感性是新定义的，并且使用微带贴片天线对评估为150o的半功率光束宽度作为天线对距离的函数。从数值和实验研究中，显而易见的是，天线对从Forteeth部分到Free空间波长的第十一部分的距离保证窄光束操作小于到达角度为10°的到达角度的范围。

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