Six-port broadband balancing network based on double-faced strip lines

Abstract

The invention discloses a six-port broadband balancing network based on double-faced strip lines. The six-port broadband balancing network based on the double-faced strip lines comprises an upper double-faced parallel strip line structure, a lower double-faced parallel strip line and two 180-degree ideal broadband inverters, wherein upper double-faced parallel strip line structure and the lower double-faced parallel strip line are parallel to each other. two broadband power dividing networks symmetric to each other from left to right and two parallel-connected half-wavelength transmission lines form a six-port balanced power dividing network; the two 180-degree inverters can well achieve common-mode signal suppression; four isolation resistors connected in parallel in the middle of an inverse power divider can effectively improve isolation of an output port; an integral balancing circuit improves the power dividing bandwidth of a differential mode by more than 50% as well as isolation of a power dividing port to more than 35 dB. The six-port broadband balancing network based on the double-faced strip lines is compact in structure, simple in design and good in electrical properties and easily achieves integration with other planar microwave millimeter wave circuits and systems.

Description

technical field [0001] The invention belongs to a microwave and millimeter wave hybrid planar integrated circuit, in particular to a six-port high-isolation broadband balanced network based on double-sided parallel strip lines. Background technique [0002] The rapid development of wireless communication technology has led to the development of microwave and millimeter wave circuits and systems in the direction of miniaturization, integration and modularization. There are complex electromagnetic interferences at the nodes and interconnections between different dielectric circuit layers. Broadband multi-port balanced circuits and systems play a vital role in microwave and millimeter wave circuits and systems due to their good common-mode rejection and anti-interference characteristics. The planar double-sided stripline structure is a double-layer balanced transmission line, such as document 1 ("J.X.Chen, C.H.K.Chin, and Q.Xue, Double-sided parallel-strip line with an inserted...

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Problems solved by technology

The planar double-sided stripline structure is a double-layer balanced transmission line, such as document 1 ("J.X.Chen, C.H.K.Chin, and Q.Xue, Double-sided parallel-strip line with an inserted conductor plane and its applications, IEEE Trans. Microw .Theory Tech., vol.55, no.9, Sep.2007, pp.1899-1904"), and literature 2 ("J.Shi, J.X.Chen, and Q.Xue, A differential voltage-controlled integrated antenna oscillator Based on doubled-sided parallel-strip line, IEEE Trans.Microw.Theory Tech., vol.56, no.10, Oct.2008, pp.2207–2212") has introduced this planar transmission line structure in more detail characteristics and applications, but the design of multi-port balanced network based on double-sided parallel strip lines is still less

In the past, the design of balanced multi-port network is generally just a simple replacement of multi-stage balun structure, and its implementation and application in microwave and millimeter wave hybrid integrated circuits, such as literature 3 (“J.W.May and G.M.Rebeiz, A 40–50 -GHz SiGe 1:8differential power divider using shielded broadside-coupled striplines, IEEE Trans. Microw. Theory Tech., vol.56, no.7, Jul.2008, pp.1575–1581"), and literature 4 ("L.S. Wu,B.Xia,and J.F.Mao,A half-mode substrate integrated waveguide ring for two-way power division of balanced circuit,IEEE Microw.Wireless Compon.Lett.,vol.22,no.7,Jul.2012,pp .333-335"), introduced several multi-port balanced power distribution network structures in detail. The main disadvantages of these multi-port balanced networks are: (1) The cascade structure is large in size and complex in circuit; (2) Differential mode The power division bandwidth is less than 25%, which cannot meet the requirements of the broadband information system; (3) the common mode suppression bandwidth is narrow, and the power division port differential mode common mode interchange suppression is poor

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