Ideal inverter based broadband unequal six-port balancing network

Abstract

The invention discloses an ideal inverter based broadband unequal six-port balancing network. The ideal inverter based broadband unequal six-port balancing network comprises a microstrip line structure and two 180-degree ideal broadband inverter structures, wherein symmetrical left and right broadband power dividing networks and two half-wavelength transmission lines connected in parallel in the middle form the six-port balancing power dividing network. The two half-wavelength transmission lines connected in parallel in the middle can better inhibit common-mode signals, a half-wavelength microstrip branch line connected with a power dividing input port in parallel further increases the transmission zero, and the common-mode rejection bandwidth is broadened. The isolation of an output port is improved effectively by the aid of four isolation resistors connected in the middle of the inverters in parallel. By the aid of the whole balancing circuit, the common-mode rejection bandwidth is increased to be higher than 110%, the isolation of power dividing ports is larger than 30 dB, and the balancing network is compact in structure, simple in design and good in electrical property and is easily integrated with other planar microwave and 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 broadband unequal six-port balanced network based on an ideal inverter. Background technique [0002] With the advancement of wireless communication technology, microwave and millimeter wave circuits and systems are developing in the direction of miniaturization, modularization and integration. In a communication system, complex electromagnetic mutual interference exists at nodes and interconnections between different media and circuit layers. Therefore, a balanced circuit with common-mode suppression and environmental noise reduction capabilities is required to suppress these interferences. 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 microstrip-slot line transition structure has been...

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Problems solved by technology

Such as 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.”), and literature 5 (“J.W.May and G.M.Rebeiz, A 40–50-GHz SiGe 1:8 differential power divider using shielded broadside-coupled striplines, IEEE Trans.Micow.Theory Tech., vol.56, no.7, Jul.2008, pp.1575–1581."), all introduced several multi-port balanced power distribution and synthesis network structures in detail, but these networks have some defects: (1 ) The circuit is complex and the size is large; (2) The common mode rejection bandwidth is less than 60%, the differential mode power division bandwidth is less than 25%, and the bandwidth cannot meet the requirements of broadband communication; (3) The power division port differential mode common mode interchange rejection degree Difference

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