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Studies on IF noise caused by transmitter signal leakages of the W-band homodyne FMCW radar with a single antenna configuration  

Park Jung-Dong (Agency for Defense Development)
Kim Wan-Joo (Agency for Defense Development)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.42, no.7, 2005 , pp. 49-56 More about this Journal
Abstract
In this paper, we describe a solution to improve the effects of the transmitter leakage signals on the frequency modulated continuous wave (FMCW) radar with a single antenna configuration. We analyze characteristics of the IF noise caused by insufficient isolation between transmitter and receiver. The magnitude of the intermediate frequency (IF) noise from a front-end can be reduced by matching the LO signal delay time with that of the largest leakage source. Because the IF noise has periodic singularities at nT$_{m}$/2, t=0,1,2$\cdots$, we find that spectrum of the IF noise due to the leakage signals is very similar to that of the VCO moduation signal except low frequency elements in the vicinity of DC. Based on the studies, we fabricated a W-band homodyne FMCW radar sensor and verified the proposed solution. The results are applicable to design of the homodyne FMCW radar with a single antenna configuration.
Keywords
FMCW radar; Leakage; Single antenna;
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