摘要
为实现一个负阻抗器件抵消天线的寄生电抗,将天线的辐射电阻转变为一个常量,避免了传统无源匹配网络的增益带宽约束条件限制,并获得了更宽的天线带宽。设计了一个10cm单极天线的非福斯特匹配电路,并进行了仿真和实际测试,二者吻合度较高。试验结果表明:在60~400 MHz频带内,添加非福斯特匹配电路与添加传统无源匹配电路的接收天线相比,天线的输入阻抗虚部在全频带内得到了较为充分的抵消,信噪比最大可提高4dB,在200~260 MHz频带内,天线3dB带宽提高了11 MHz。
A negative impedance device to cancel the antennars parasitic reactance is realized by non- Foster matching circuit, by which the antennars radiation resistance is transformed to a constant value and the gain-bandwidth limitation of traditional passive matching is avoided. In this way a superior broadband performance is achieved. A non-foster matching circuit of a 10 cm wire monopole antenna is designed and optimized. The simulation and practical tests are carried out, both of which fit quite well. The test result indicates that within the frequency range of 60-400 MHz, the input resistance＇s ima- ginary part of the antenna is canceled sufficiently and the signal-to-noise ratio is improved by up to 4 dB as compared to the same antenna with traditional passive matching. The 3 dB bandwidth of the antenna is improved by 11 MHz within the frequency range of 200-260 MHz.
出处
《海军工程大学学报》
CAS
北大核心
2017年第3期53-58,共6页
Journal of Naval University of Engineering
基金
国家自然科学基金资助项目(61302099)
关键词
非福斯特匹配
有源接收天线
负阻抗变换器
稳定性分析
non-Foster matching
active receive antenna
negative impedance converters
stability analysis
