Balanced ultra-wideband band-pass filter based on multimode slot line resonator

A band-pass filter and resonator technology, applied in waveguide-type devices, sustainable communication technology, advanced technology, etc., can solve the difficulty of independent control of the second and third passband bandwidths, the inability to introduce multiple transmission poles, and the inability to Adjustment of notch characteristics, etc., to achieve the effect of improving out-of-band rejection performance, good common-mode rejection effect, and miniaturization of size

Active Publication Date: 2021-11-26
XIDIAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the interdependence between different frequency bands is stronger than that of dual-band filters, it is difficult to achieve independent control of the bandwidth of the second and third passbands, and since the filter can only be formed by open-loaded screw resonators Two resonant modes, unable to introduce multiple transmission poles, resulting in narrow bandwidth, and the filter cannot be easily adjusted for notch characteristics

Method used

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  • Balanced ultra-wideband band-pass filter based on multimode slot line resonator
  • Balanced ultra-wideband band-pass filter based on multimode slot line resonator
  • Balanced ultra-wideband band-pass filter based on multimode slot line resonator

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Embodiment 1

[0024] Microwave filters are an important part of modern communication systems, and the performance of the filters is related to the communication quality of the entire system. Most of the existing microwave filters are large in size, and with the increasingly complex modern electromagnetic environment, there are more signal noise interferences outside the passband. The ultra-wideband multimode filter of traditional microstrip technology has a narrow stopband and out-of-band selectivity. The shortcomings of poor and large size cannot meet the high performance requirements of ultra-wideband filters, so it is of great significance and practical demand to study ultra-wideband filters with good out-of-band suppression characteristics and miniaturization characteristics. Therefore, the present invention proposes a balanced broadband bandpass filter based on a multimode slotline resonator.

[0025] The invention is a balanced broadband bandpass filter based on a multi-mode slot line...

Embodiment 2

[0032] The overall structure of the balanced broadband bandpass filter based on the multimode slot line resonator is the same as that of Embodiment 1, the aspect ratio of the microstrip bottom of the present invention is in the range of 4:1-5:1, and the aspect ratio of the microstrip arm is in the range of 4:1-5:1. 3:1-4:1 range. Between the microstrip bottoms of the two U-shaped microstrip lines 2 are printed two rectangular microstrip lines 3 that are mirror-symmetrical about the Y axis, and the long side of the rectangular microstrip line 3 is parallel to the X axis, and the short side is parallel to the X axis. The axis is vertical, the aspect ratio of the two rectangular microstrip lines 3 is in the range of 1:1-2:1, the distance between the rectangular microstrip line 3 and the U-shaped microstrip line 2 is in the range of 0.1mm-0.5mm, and the rectangular The microstrip line 3 is located on the same side as the U-shaped microstrip line 2 .

[0033] It is generally belie...

Embodiment 3

[0038] The overall structure of the balanced broadband bandpass filter based on the multimode slotline resonator is the same as that of Embodiment 1-2. In this example, the aspect ratio of the microstrip bottom is 4.5:1, and the aspect ratio of the microstrip arm is 3.5:1. . Between the microstrip bottoms of the two U-shaped microstrip lines 2 are printed two rectangular microstrip lines 3 that are mirror-symmetrical about the Y axis, and the long side of the rectangular microstrip line 3 is parallel to the X axis, and the short side is parallel to the X axis. The axes are vertical, the aspect ratio of the two rectangular microstrip lines 3 is 1.5:1, and the distance between the rectangular microstrip lines 3 and the U-shaped microstrip line 2 is 0.25 mm.

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Abstract

The invention provides a balanced ultra-wideband band-pass filter based on a slot multi-mode resonator, and solves the problems of strong common-mode interference, narrow passband, low selectivity and large size. The filter comprises two U-shaped and rectangular microstrip lines printed on the upper surface of a dielectric substrate, and a first stepped impedance slot line, a second stepped impedance slot line and a multimode slot resonator are etched on a metal floor. The rectangular microstrip line coincides with the interpenetrating position of the first stepped impedance slot line and the second stepped impedance slot line on the metal bottom plate to form a three-line interdigital coupling structure. According to the invention, a U-shaped microstrip-to-rectangular slot line structure is used to separate a common mode from a differential mode, so that good common mode suppression is realized; the three-wire interdigital coupling structure strengthens coupling of input and output signals; and the notch characteristic of the filter is adjusted by using the multimode slot resonator. The filter has the characteristics of ultra-bandwidth, small size, high selectivity and good common-mode rejection, and is applied to the field of electromagnetic microwave and radio frequency circuits and systems.

Description

technical field [0001] The invention belongs to the field of electromagnetic microwave and radio frequency technology, and mainly relates to a bandpass filter with small size and wide frequency band, specifically a balanced ultra-wideband bandpass filter based on a multimode slot line resonator, which can be applied to radio frequency microwave circuits and system. Background technique [0002] In many existing wireless communication systems, higher requirements are placed on the bandwidth and transmission rate of microwave components. Microwave filters are an important part of modern communication systems, and the performance of the filters is related to the communication quality of the entire system. Among them, ultra-wideband (UWB) filters with advantages such as small size, wide frequency band, and stable performance are widely used, and strong signal penetration and anti-interference ability are the significant advantages of UWB technology. In recent years, the design...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203
CPCH01P1/20309H01P1/20336Y02D30/70
Inventor 李钊乔璐妍韩颖李蕊魏峰杨勇杨晓宁李文淼毕研强李西园
Owner XIDIAN UNIV
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