What are Impedance Matching Pads?

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- everything RF

Nov 10, 2018

Impedance Matching Pads are used to connect two systems that have different impedances. For example, connecting a 50 ohm cable to a 75 ohm system, will result in an impedance mis-match that will cause unwanted reflections at the interface of the mis-match, thereby effecting the integrity of the signal. By using an impedance matching pad, the mis-match is accounted for and the unwanted reflections are minimized.

Most impedance matching pads look like adapters, with a coaxial connector on either side. So now a 50 ohm cable can be connected to a 75 ohm system by placing an Impedance matching device between them. When selecting this device, it is important to know the connector type being used and the connector gender. In addition to this one must also specify the impedances that need to be matched. Most RF systems are 50 Ohms, 75 Ohms or 93 Ohms. As a result, impedance matching pads have been developed to match these impedance values i.e 50 Ohms to 75 Ohms, 50 Ohms to 93 Ohms and vice versa.

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