A Dual-Mode Balanced Filter Based on Microstrip Slotted Line Structure

Abstract

The invention discloses a double-mode balance filter based on a micro-strip slotted line structure. The double-mode balance filter based on the micro-strip slotted line structure comprises a first filter and a second filter, wherein the first filter and the second filter are equal in size and symmetrical to each other. The first filter and the second filter respectively comprises a micro-strip line structure located on the upper layer of a dielectric substrate and a slotted line structure located on the lower layer of the dielectric substrate, wherein the micro-strip line structure of the first filter comprises a first feeder line, a second feeder line, a first harmonic oscillator and a second harmonic oscillator, and the slotted line structure of the first filter comprises a first slotted line and a second slotted line. The micro-strip line structure of the second filter comprises a third feeder line, a fourth feeder line, a third harmonic oscillator and a fourth harmonic oscillator, and the slotted line structure of the second filter comprises a third slotted line and a fourth slotted line. A bending structure is adopted by the first harmonic oscillator, the second harmonic oscillator, the third harmonic oscillator and the fourth harmonic oscillator, a part of each harmonic oscillator is located on the upper layer of the dielectric substrate, and the other part of each harmonic oscillator is located on the lower layer of the dielectric substrate. The double-mode balance filter based on the micro-strip slotted line structure has the advantages of being wide in frequency band and high in common-mode rejection, is simple in circuit structure and easy to manufacture, and has high practicability.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a dual-mode balanced filter based on a microstrip slotted line structure. Background technique [0002] In modern wireless communication systems, balanced devices have received more and more attention, because balanced devices can effectively suppress environmental noise and system internal noise. As an essential device in wireless communication systems, balanced filters have been extensively studied in recent years. The balanced filter has a filtering effect under the excitation of the differential mode signal, and can effectively suppress the noise generated in the environment and inside the system, so it is widely used in modern wireless communication circuits. Common-mode signals will reduce its signal-to-noise ratio, so in balanced circuit design, it is necessary to enhance the rejection level of common-mode signals as much as possible. [0003] Existing bal...

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Problems solved by technology

[0003] Existing balanced filter designs are mainly aimed at narrowband systems, because it is difficult to suppress common-mode signals in a wide frequency band, and balanced filters often have very complex structures

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