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简单地介绍了微波同轴匹配负载常见的几种结构型式和特点,并对影响匹配负载的主要因素进行了分析讨论,给出了宽带SMA微波同轴匹配负载的结构,以及国外两种同类负载在美国HP8409B自动网络分析仪上进行对比测试结果。测试结果表明,自行研制的SMA匹配负载,在DC—18GHz频带范围内,具有良好的电性能,其电压驻波比≤1.25。具有频带宽、驻波低、尺寸小、重量轻等特点。还介绍了一种结构新颖的宽带微波同轴匹配负载。最近几年,原子钟的长期稳定度已经进展到10~(-16)量级。这些装置在空间对于通过VLBI高精度的角度测量以及通过多普勒技术高精度的测距和测速是非常适用的。这篇文章将介绍某些正在进行和提出的应用高稳定度钟的空间科学实验以及钟在这些测量上的意义。
The common types and features of microwave coaxial matching load are briefly introduced. The main factors that affect the matching load are analyzed and discussed. The structure of coaxial matching load for broadband SMA microwave is given, and two kinds of similar loads In the United States HP8409B automatic network analyzer for comparison test results. The test results show that the self-developed SMA matching load has good electrical performance in the frequency range of DC-18GHz and the voltage standing wave ratio is less than or equal to 1.25. With the frequency bandwidth, low standing, small size, light weight and so on. Also introduced a novel structure of broadband microwave coaxial matching load. In recent years, the long-term stability of the atomic clock has progressed to the order of 10 ~ (-16). These devices are ideally suited for space-based high-precision angular measurement via VLBI and high-precision range and velocity measurement with Doppler technology. This article will introduce some of the ongoing and proposed space science experiments using high-stability clocks and the significance of these clocks in these measurements.