Multiport high-isolation-degree balance power dividing network based on broadside coupling

Abstract

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.

Description

technical field [0001] The invention belongs to microwave and millimeter wave hybrid planar integrated circuits, in particular to a balanced power distribution network based on broadside coupling, multi-port and high isolation. Background technique [0002] With the development of wireless communication technology, microwave circuits and systems are becoming more complex, with more functions and dense spaces for signal conversion. Therefore, there is strong electromagnetic mutual interference at the nodes and interconnections of circuits with different dielectric layers. Compared with single-port input circuits, broadband balanced / differential circuits have become very important in modern communication systems because of their better common-mode rejection and anti-interference characteristics. In the broadband balanced circuit system, the broadband balanced power distribution network can replace the multi-stage balun structure, and can provide signal transmission for the bal...

AI Technical Summary

Problems solved by technology

However, the previous multi-port balanced power distribution network structure generally adopts the cascading of power dividers, and the disadvantages are: (1) the structure is large and the circuit is complicated; (2) the differential mode signal power division bandwidth is generally less than 25%; ( 3) The suppression of the common mode signal cannot be achieved in a wide frequency band; (4) The isolation between the differential mode signal and the common mode signal exchange between the power distribution ports is relatively poor

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