Symmetrical Lange bridge with non-staggered bridge arms

Abstract

The invention discloses a symmetrical Lange bridge with non-staggered bridge arms, which comprises a first port balance feed-in structure, a second port balance feed-in structure, a first bridge arm coupling structure, a second bridge arm coupling structure, an input end feed-in network, a balance absorbing load network, a through end, a coupling end and a bridge arm connecting network, wherein the first port balance feed-in structure, the second port balance feed-in structure and the bridge arm connecting network adopt X-shaped cross bridging; the X-shaped cross bridging of the bridge arm connecting network enables bridge arm coupling structures to be in non-staggered connection; and the spatial layout of the first bridge arm coupling structure and the second bridge arm coupling structure, the spatial layout of the input end feed-in network and the balance absorbing load network and the spatial layout of the through end and the coupling end are in full mirror symmetry. The symmetrical Lange bridge with non-staggered bridge arms has the advantages that the impedance unbalance between the coupling end and the through end of the Lange bridge is improved, the level of isolation between the coupling end and the through end of the Lange bridge is improved, the phase unbalance between the coupling end and the through end of the Lange bridge is reduced and the port standing wave characteristic is improved.

Description

technical field [0001] The invention relates to a symmetrical Lange bridge without dislocation of bridge arms, which is widely used in technologies such as microwave and millimeter wave circuits and systems. Background technique [0002] The Lange bridge has a wide range of applications in power synthesis, balanced amplification, phase shifter, vector modulation, quadrature mixing, etc. Ideally, engineers hope to have good phase quadrature characteristics, and balanced port impedances at the through end and the coupling end. Only in this way can we ensure good synthesis efficiency, phase shift accuracy, modulation phase error, image rejection and other characteristics in different applications. However, due to the unbalanced port signal feed-in structure of the traditional Lange bridge, the bridge arm dislocation due to the cross-type bridge connection, and the asymmetry between the absorbing load at the isolation end and the layout of the input end, resulting in an unbalanc...

AI Technical Summary

Problems solved by technology

However, due to the unbalanced port signal feed-in structure of the traditional Lange bridge, the bridge arm is dislocated due to the cross-type bridge connection, and the absorption load at the isolation end is asymmetrical with the layout of the input end, resulting in an unbalanced port impedance between the through end and the coupling end of the traditional Lange bridge. , the isolation between ports becomes worse, especially in millimeter wave and submillimeter wave applications. The direct performance is that the Lange bridge loses the traditional advantages of high isolation and good standing waves. The indirect performance is that under different application conditions, Decreased synthesis efficiency, worsened phase accuracy and error, worsened harmonic and image rejection performance, etc.

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