Feed network device, antenna feeder subsystem, and base station system

摘要

A feed network device, an antenna feeder subsystem, and a base station system are provided. The feed network device comprises: two first stage couplers, two phase shifters, and two second stage couplers cascaded on a Printed Circuit Board, wherein each coupler is a multilayered dielectric broad-side coupler, and the difference of phase between an output signal at the coupling port and an output signal at the direct connection port is 90° in each multi-dielectric broad-side coupler.