The main function of the coupler is to divide the microwave power of one channel into several channels proportionally in the microwave system, mainly to realize power distribution.
Principle: The coupler is a radio frequency device that extracts a small part of the signal from the main channel of the wireless signal. Like the power divider, it belongs to the power distribution device. The difference is that the coupler is an unequal power distribution device.
The coupler is used in conjunction with the power divider, mainly to achieve one goal - to make the transmit power of the signal source as evenly distributed as possible to each antenna port of the indoor distribution system, so that the transmit power of each antenna port is basically the same.