A power divider may coherently divide an RF or microwave input signal into multiple instances of that signal. The power divider may include: an input port that receives the input signal; multiple output ports; and passive signal splitting circuitry that causes a different instance of the input signal to be delivered to each of the output ports all substantially in phase with one another and with substantially equal amplitude, but isolates any signal that is reflected back to one of the output ports from a device to which the output port is connected from any of the other output ports.