Broadband Balun Filter Design Using Half-groove Lines

Abstract

The invention discloses a balun filter designed by using half-groove lines, and belongs to the technical field of basic electrical components. The balun filter includes a single-layer dielectric plate and a microstrip power divider formed by etching the upper metal layer of the single-layer dielectric plate, and the signal phase difference is 180°. The lower metal layer of the single-layer dielectric board is etched with a half-slot line structure. The half-slot line structure includes three short-circuit boundaries. The three short-circuit boundaries are two long boundaries and one short boundary respectively. The three boundaries are connected end-to-end at 90 degrees to form a continuous slot line. The three short-circuit boundaries and the boundary between the lower metal layer The metal is the floor, and the metal of the lower metal layer except the floor is the signal line. The signal line and the floor form the feeder part, and the signal line is fed through the open end of the half-slot line structure. The two long short-circuit boundaries of the slot line are respectively coupled with metal resonators of the same size, so that the inventive purpose of improving the selectivity and out-of-band suppression capability of the balun filter is achieved through a compact circuit structure.

Description

technical field [0001] The patent of the present invention relates to wireless communication technology, in particular to a balun filter designed using half-groove lines, and belongs to the technical field of basic electrical components. Background technique [0002] The balanced circuit can suppress the common-mode noise while transmitting the differential-mode signal. The balanced circuit has good immunity to environmental noise and device thermal noise, which can greatly improve the efficiency of the transmitter and improve the signal-to-noise ratio of the receiver. Therefore, balanced circuits play an increasingly important role in modern communication systems. However, commonly used transmission circuits such as microstrip line structure and coplanar stripline are unbalanced circuits. In order to realize the transition from unbalanced structure to balanced structure, we must use a balanced-unbalanced conversion structure, such as Bar Lun. In order to make the balun st...

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Problems solved by technology

[0007] The purpose of the invention of the present invention is to aim at the deficiency of above-mentioned background technology, provide the broadband balun filter that utilizes half-groove line design, realize the invention purpose of improving balun filter selectivity and out-of-band suppression ability through compact circuit structure, solve The existing slot-based balun filter cannot take into account the technical problems of good filtering characteristics in a wide frequency band and a compact circuit structure

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