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  Impedance Matching Since a transmission line has impedance built in, the natural question to ask is, how does the impedance affect signals that are relayed through a transmission line from one device to another? The answer to this question ultimately depends on the impedance of the devices to which the transmission line is attached. If the impedance of the transmission line is not the same as the impedance of, say, a load connected to it, the signals propagating through the line will only be partially absorbed by the load. The rest of the signal will be reflected back in the direction it came. Reflected signals are generally bad things in electronics. They represent an inefficient power transfer between two electrical devices. How do you get rid of the reflections? You apply a technique called impedance matching. The goal of impedance matching is to make the impedance of two devices that are to be joined equal. The impedance-matching techniques make use of special matching networks t