Narrow-band difference band-pass filter based on terminal short circuit self-coupling annular resonator

Abstract

The invention discloses a narrow-band difference band-pass filter based on a terminal short circuit self-coupling annular resonator. The narrow-band difference band-pass filter comprises a terminal short circuit self-coupling annular resonator and two coupling micro band lines. Micro band line design with distribution parameters is adopted. The narrow-band difference band-pass filter has the advantages of light weight, high reliability, excellent property, good temperature stability, large-scale production, low cost, and the like, is wide in application prospect in radar of different frequency bands, communication and future high-velocity data wireless communication, and can be particularly used in corresponding systems with harsh requirements on weight, property and reliability.

Description

technical field [0001] The invention belongs to the field of microwave and millimeter wave technology, in particular to a narrow-band differential band-pass filter based on a terminal short-circuit self-coupling ring resonator. Background technique [0002] With the rapid development of modern wireless communication systems, the needs and applications of balanced circuits are becoming more and more important. The differential filter is particularly important in the balanced circuit structure because of its good anti-noise interference and dynamic range characteristics. For a better differential filter structure, only the desired differential-mode signal passes through the filter structure, while common-mode signals are rejected. In addition, the differential filter must have good edge selection characteristics and harmonic suppression characteristics. In recent years, many different kinds of differential filter structures have been proposed to meet the needs of narrowband,...

AI Technical Summary

Problems solved by technology

In recent years, some scholars have first proposed a multi-stage broadband coupling differential bandpass filter structure, but this structure is difficult to apply to balanced circuits as a real differential filter due to the lack of suppression of common-mode signals.

In order to overcome this shortcoming, an ultra-wideband microstrip differential bandpass filter with good common-mode rejection characteristics is designed and applied, but in order to meet the requirements of the ultra-wideband frequency band, but because it is connected in multiple stages, the entire circuit is enlarged bulk; and rejection of out-of-band common-mode signals is not ideal

In order to reduce the volume, some scholars have used coupled resonators and coupled lines to improve common-mode rejection and extend the upper limit stopband of differential mode, but its differential loss is relatively large

Based on the above analysis, we proposed a narrow-band differential bandpass filter based on short-circuited self-coupling ring resonators, and no related research and reports have been found.

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