Abstract
This chapter discusses the time domain reflectometry (TDR). This method is almost equivalent to impedance matching, but it is represented in a different way. If a wire grounded at one of its ends, how it works is a wonder. This is a very strange question for the engineers who are not familiar with high-frequency signal effects. The signal reflection is an interesting measurement technique which is known as TDR. This technique detects, measures, and locates any impedance mismatch in a transmission line. Besides, it can also be used to locate discontinuities in a connector, printed circuit board, or any other electrical path. Any impedance discontinuities will cause some of the incident signal to be sent back toward the source. By the help of this technique, TDR engineers can easily rectify any problems related to water ingress, corroded contacts, or something similar just by looking at the TDR shapes. Further, the importance of mathematical aspects of TDR signal of which can bring you back into the frequency domain is discussed. This technique also deduces the line's bandpass.
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