a useful device to include in the waveguide run
A four port device that transmits the majority of signal power incident on its input port to the output port and the remainder of the signal power to a third, coupled port. Signals incident on the output port are coupled to the fourth, coupled port, which may be terminated with a resistor equal in value to the coupler's characteristic impedance. The ratio of the coupled power to the input power is the coupling factor.
A high-quality tapping device providing isolation between tap and output terminals.
A passive signal splitting device, with minimum signal loss between the input port and the output port (through loss), a specified coupling loss between the input port and the tap port (tap or coupler loss), and very high loss between the output port and tap port (isolation).
A coupling device for separately sampling (through a known coupling loss) either the forward (incident) or the backward (reflected) wave in a transmission line.
A coupler which only works in one direction.
A device that samples the energy traveling in a waveguide in one direction only.