Multiplexer

The invention relates to the technical field of communication devices, and discloses a multiplexer. The multiplexer comprises a body, the body is provided with an input port and multiple output ports, the body is internally provided with a cavity, the cavity is internally provided with multiple filters, each filter comprises a resonant cavity and multiple resonators which are arranged at the bottom wall of the resonant cavity, and two adjacent resonant cavities share one public wall; the multiplexer further comprises a feed network, and the feed network is provided with a feed inlet and multiple feed outlets; the input port is connected to the feed inlet, the feed outlets are connected to input ends of the filters, and the output ports are connected to output ends of the filters. By arranging the multiple resonators in single resonant cavity to form a multi-order filter, the volume of the single resonant cavity body is small, thus the volume of the multiplexer is small, the metal consumable items are few, and