Transmission Lines
摘要
This chapter explains why the impedance 50 Ω is so ubiquitous in physics labs. First, the transmission line is introduced and then the extremely important concept of its characteristic impedance is defined. Fresnel’s law is used to find the reflection coefficient for electric signals in a transmission line (Eq. 5.2) and that will explain why transmission lines need to be terminated. One section treats the problem of how to properly split and splice transmission lines. Finally, one of the most common applications of signal reflections in transmission lines is presented, namely, the Time Domain Reflectometer.