High-selectivity broadband anti-phase filtering power divider based on three-wire coupling

Abstract

The invention relates to a high-selectivity broadband anti-phase filtering power divider based on three-wire coupling, which comprises a dielectric substrate and a circuit layer, wherein the lower surface of the dielectric substrate is provided with a metal grounding plate; the circuit layer is arranged on the upper surface of the dielectric substrate; the circuit layer comprises an input port feeder line, a branch knot loading resonator, a first output port feeder line, a second output port feeder line, an output port connecting line and a grounding resistor; during working, a signal enters from the input port feeder line, is coupled to the branch loading resonator in parallel through the two paths of quarter-wavelength open-circuit coupling lines to generate resonance, and is coupled and output through the first output port feeder line and the second output port feeder line after resonance; the reverse phase difference is generated by the terminal grounding of the first output port feeder line and the phase shift feeder line of the second output port feeder line, and the output port signal isolation is realized by loading a grounding resistor through the output port connecting line. The filter is simple in structure, flexible in design, high in selectivity, large in bandwidth and good in port matching and isolation.

Description

technical field [0001] The invention belongs to the technical field of microwave passive devices, and in particular relates to a high-selectivity broadband inverting filter power divider based on three-wire coupling. Background technique [0002] In recent years, modern wireless communication systems have flourished, increasing the demand for miniaturized, low-cost, and multifunctional microwave devices. Among them, the inverting filter power splitter, as a multifunctional device integrating signal filtering, power distribution, signal inversion and port isolation, has attracted more and more attention. The high-performance inverting filter power divider can not only effectively reduce the size of the system, but also simplify the complexity of the system design and reduce the design cost, so it can be widely used in the feeding system of array antennas, power amplifiers, mixers, etc. system design. [0003] Document 1 (H.Zhu, Z.Cheng and Y.J.Guo, "Design of Wideband In-Ph...

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Problems solved by technology

[0006] In a word, the problems existing in the prior art are: the inverting filter power splitter cannot take into account simple structure, flexible design, high selectivity, wide bandwidth, good port matching and isolation, which is not conducive to popularization and application in modern wireless communication systems

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