Broadband balun filter using half-mode slot line design

Abstract

The invention discloses a balun filter designed by utilizing a half-mode slot line, and belongs to the technical field of basic electrical elements. The Balun filter comprises a single-layer dielectric plate and a micro-strip power divider formed by etching an upper metal layer of the single-layer dielectric plate, and the centimeter signal phase difference is 180. And a semi-slot line structure is etched on the lower metal layer of the single-layer dielectric plate. The semi-slot line structure comprises three short-circuit boundaries, and the three short-circuit boundaries are respectively two sections of long boundaries and one section of short boundaries; the three boundaries are connected end to end at 90 degrees to form a continuous slot line, metal between the three short-circuit boundaries and the boundary of the lower metal layer is a floor, metal, except the floor, of the lower metal layer is a signal line, and the signal line and the floor form a feeder line part; and the signal line is fed through the open circuit end of the semi-slot line structure. The two long short-circuit boundaries of the slot line are respectively coupled with the metal resonators with the same size, so the purpose of improving the selectivity and out-of-band rejection 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 by using half-mould slot lines, which belongs to the technical field of basic electrical components. Background technique [0002] The balanced circuit can suppress common mode noise while transmitting differential mode signals. The balanced circuit has good immunity to environmental noise and device thermal noise, which can greatly improve the efficiency of the transmitter and the signal-to-noise ratio of the receiver. Therefore, balanced circuits play an increasingly important role in modern communication systems. However, the commonly used transmission circuits such as microstrip line structure and coplanar strip line are all 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 enable the bal...

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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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