For a reflective RF switch, when it is in the "off" state, the non-conducting port presents high impedance (open circuit) or low impedance (short circuit). This prevents the signal input to this port from passing through and instead reflects it directly back to the signal source. For an absorptive RF switch, when it is in the "off" state, the non-conducting port is connected to a matched load (typically a standard 50Ω impedance). The signal input to this port is converted into thermal energy via the load resistor and dissipated (absorbed), thus avoiding signal reflection.

Advantages of absorptive RF switches: They absorb signals when turned off, featuring high isolation and excellent VSWR (Voltage Standing Wave Ratio), which reduces interference.

Application scenarios of absorptive RF switches: Suitable for scenarios requiring high signal purity, such as communication receiving systems and test equipment like spectrum analyzers.

Advantages of reflective RF switches: They have fast switching speed (nanosecond-level), large power handling capacity, and some are compact in size.

Application scenarios of reflective RF switches: Ideal for applications requiring high-speed switching, such as radar transmitters, satellite communications, and high-speed data transmission systems.