一种利用非福斯特匹配电路改进月面低频薄膜天线的设计方案  

An Application of Non-Foster Matching Circuit in Improving Lunar Low-frequency Membrane Antenna

作　　者：周嘉 吴锋泉[2] 孙士杰 索南本 张骄 陈学雷[2] Zhou Jia;Wu Fengquan;Sun Shijie;Suo Nanben;Zhang Jiao;Chen Xuelei(Shanxi University,Taiyuan 030000,China;National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China,Email:[e-mail])

机构地区：[1]山西大学,山西太原030000 [2]中国科学院国家天文台,北京100101

出　　处：《天文研究与技术》2023年第3期211-218,共8页Astronomical Research & Technology

基　　金：国家自然科学基金(12273070,11473044,11973047);SKA专项(2022SKA0110100);中国科学院科研仪器设备研制项目(ZDKYYQ20200008)资助.

摘　　要：月面低频射电天文观测具有巨大科学发现的潜力,有望揭开宇宙黑暗和黎明时代的秘密。针对月球背面低频观测提出一种新的设计方案,利用非福斯特匹配电路,大大减小了天线的物理尺寸,使之结构轻巧便于月面部署。首先设计了一种轻巧、宽温度范围、易延展、可折叠、便于在月面部署的电小薄膜天线,具有良好的全向性,在4~8 MHz增益小于1.92 dB,半波束宽度大于83°;然后利用加载非福斯特匹配电路改善其阻抗性能,将天线的电抗从-985.3Ω优化到小于-16.5Ω;最后采用等效电路进行阻抗和噪声实测,噪声功率水平在绝大部分频率范围内小于-150 dBm,初步证实该方案的可行性。Low-frequency radio observations on the lunar surface have great potential for scientific discovery and are expected to reveal the secrets of the dark age and cosmic dawn of the Universe.This paper proposes a new design for low-frequency radio lunar observation.The non-Foster matching circuit is used to significantly reduce the physical size of the antenna,making it light and easy to deploy on the moon.First,an electrically small membrane antenna which is light,wide temperature range,malleable,foldable,simple to deploy,and with good omnidirectionality is designed,gain is less than 1.92 dB in 4-8 MHz and half-beam width is greater than 83°.Then,a non-Foster matching circuit is employed to improve impedance performance,the reactance of the antenna is optimized from about-985.3Ωto-16.5Ω,and the noise power level is less than-150 dBm in most frequency range.Finally,The feasibility of the design is preliminarily confirmed by impedance and noise measurement.

关 键 词：低频射电天文 月球天文观测 薄膜天线 电小天线 非福斯特匹配电路 

分 类 号：P111.5[天文地球—天文学]