RF mixers are electronic components that combine two or more radio frequency (RF) signals in a single device. They are commonly used in wireless communication systems, such as cellular networks, satellite communications, and radar systems. RF mixers take in two RF inputs and produce a difference frequency signal, which is the difference between the frequencies of the input signals. This output signal can be used for various applications such as modulation, demodulation, and frequency conversion. RF mixers are available in different configurations, including passive and active mixers, and come in various package types, such as surface mount and through-hole devices.