We present the design and hand fabrication of a frequency-modulated continuous-wave (FMCW) radar that teaches practicing engineers and students the fundamentals of radar theory, microwave systems, and component design. The fabrication can be done by hand-cutting simple shapes of foil with a knife or by cutting more complex shapes of foil with a 2D cutter from a hobby store [1]. We provide a brief overview of the theory of operation for the FMCW system and each component used. We then describe the design procedure for each component along with experimental results from the fabricated components. The frequency of operation was chosen to be 925 MHz, or around 1 GHz. This decision was made for multiple reasons. First, the frequency is within an Industry, Science, and Medicine (ISM) band. Second, this enabled easy fabrication of microwave transmission-line circuits (m/4 is roughly 40 mm) and reasonably easy hand-soldering of discrete components for termination and amplifier biasing. Operation at the 2.4-GHz ISM band for non-North American applications is a simple shift of frequency in the design targets, but the theory remains the same.

中文翻译：

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北卡罗来纳州立大学兔子雷达：一天内构建调频连续波雷达 [应用说明]

 我们介绍了调频连续波 (FMCW) 雷达的设计和手工制造，向实践工程师和学生教授雷达理论、微波系统和组件设计的基础知识。可以通过用刀手工切割简单形状的箔或使用来自业余爱好商店的 2D 刀具切割更复杂形状的箔来完成制造 [1]。我们简要概述了 FMCW 系统和使用的每个组件的工作原理。然后，我们描述了每个组件的设计程序以及制造组件的实验结果。选择的工作频率为 925 MHz，即 1 GHz 左右。这个决定是出于多种原因。首先，频率在工业、科学和医学 (ISM) 频带内。第二，这使得微波传输线电路的制造变得容易（m/4 大约为 40 毫米），并且可以相当容易地手工焊接用于端接和放大器偏置的分立元件。对于非北美应用，在 2.4 GHz ISM 频段运行是设计目标中的简单频率偏移，但理论保持不变。