Millimeter wave frequency band broadband balun

Abstract

The invention discloses a millimeter wave frequency band broadband balun. The millimeter wave frequency band broadband balun comprises a single micro-strip input end, a first dielectric substrate, a grounding plane layer, a second dielectric substrate and a bottom metal layer which are stacked from the top to bottom in sequence, wherein the single micro-strip input end is used for inputting a single-ended signal; a coupling groove is formed in the grounding plane layer; the grounding plane layer is used as the ground of the first dielectric substrate and the second dielectric substrate; a metal strip, the first dielectric substrate and the grounding plane layer jointly form a micro-strip line structure; the left side and the right side of the bottom metal layer are symmetrically connectedwith two micro-strip output ends used for outputting differential signals; a plurality of metalized via holes are formed in the second dielectric substrate, and the second dielectric substrate, the grounding plane layer, the bottom metal layer and the two micro-strip output ends jointly form a substrate integrated waveguide; and the electric field on the upper and lower sides of the grounding plane layer are in reversed phase after transition through the coupling groove. According to the millimeter wave frequency band broadband balun, a too narrow coupling gap or a defect ground structure is not used, and in the millimeter wave frequency band, extremely excellent amplitude and phase balance are achieved.

Description

technical field [0001] The invention relates to the communication field, in particular to a broadband balun in the millimeter wave frequency band. Background technique [0002] With the increasing demand for channel capacity in communication systems, millimeter wave frequency bands have attracted widespread attention and research because they can provide greater absolute bandwidth under the same relative bandwidth. Circuits with differential topologies are widely used due to higher noise suppression and better signal integrity required in mmWave frequency band data transmission. Differential circuits need a pair of balanced signals as input and output when they work. In the process of switching between signal imbalance and balance, the balun has become an indispensable component. [0003] In the past research, scholars have devoted themselves to the miniaturization of baluns and the design of diversified functions, but most of the baluns designed are narrow-band baluns, wh...

AI Technical Summary

Problems solved by technology

For example, the Marchand balun has a wide-band response, but its amplitude and phase imbalance are poor, and generally require a narrow gap for coupling, especially in the millimeter-wave frequency band, which is not conducive to processing and realization

For another example, the balun realized based on the substrate integrated waveguide power splitter needs to use a transition structure to place the output terminals of the power splitter on both sides of the substrate to realize the output of the balanced signal, so the designed balun bandwidth is narrow and the amplitude and poor phase balance

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