The invention discloses a multiport high-isolation-degree balance power dividing network based on broadside
coupling. The multiport high-isolation-degree balance power dividing network comprises an upper-layer structure and a lower-layer structure, wherein the upper-layer structure forms a six-port balance power distributing network through parallel connection of two-stage
broadband Baluns, transmission of
broadband different-mode signals is achieved through four pairs of short-circuited
coupling lines, the isolation degree of different-mode
signal power dividing can be effectively improved through two isolation resistors connected at the output ends of the Baluns in parallel, multiple open-circuited
branch lines loaded on an upper-layer
metal layer can produce multiple transmission zero points, the inhibition degree of common-mode signals is effectively improved, the
coupling degree of the short-circuited coupling lines can be effectively improved through four
metal sheets on the lower layer, and power dividing bandwidth of the coupling lines in the upper-layer
metal layer is increased. The different-mode
signal bandwidth in a balance circuit can be improved to be higher than 50% by means of a whole balance circuit structure, and the multiport high-isolation-degree balance power dividing network is simple in structural design, small in size and good in
electrical performance and is easily integrated with other plane
microwave millimeter wave circuits.