| Summary: | 碩士 === 國立臺灣大學 === 電信工程學研究所 === 93 === The content of this thesis is based on the principle of FMCW radar to design and implement the level radar circuits. Level radar is used to measure the liquid level in chemical tanks, and thereby counts the amount of the content. The radar RF signal is generated from a VCO with frequency from 4.5GHz to 4.75GHz, then gives to 9GHz to 9.5GHz through a multiplier, for radiation from the antenna. The radar received signal is then mixed with the transmitted signal to give a Doppler frequency signal to be processed by a counter to yield with the level distance.
In Chapter 2, description on the FMCW radar principle and the schematics of level radar are presented. Chapter 3 describes the characteristics of each component, circuit design, layout, circuit implementation, and measurement results of power divider and attenuator. Chapter 4 then describes the test and measurement results in each step of assembling, and the measured results of a distant object. Chapter 5 is the conclusion.
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