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Balanced UWB Bandpass Filter Based on Multimode Slot Line Resonator

A bandpass filter and resonator technology, applied in waveguide devices, sustainable communication technology, advanced technology, etc., can solve the problem of independent control of the second and third passband bandwidths, the inability to introduce multiple transmission poles, and the inability to Notch characteristic adjustment and other issues, to achieve the effect of improving out-of-band rejection performance, good common-mode rejection effect, and miniaturization

Active Publication Date: 2022-07-12
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 UWB Bandpass Filter Based on Multimode Slot Line Resonator
  • Balanced UWB Bandpass Filter Based on Multimode Slot Line Resonator
  • Balanced UWB Bandpass Filter Based on Multimode Slot Line Resonator

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Embodiment 1

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

[0025] The invention is a balanced broadband band-pass filter based on multi-m...

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 the first embodiment. 3:1-4:1 range. Two rectangular microstrip lines 3 that are mirror-symmetrical about the Y axis are printed between the microstrip bottoms of the two U-shaped microstrip lines 2, 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, the rectangular microstrip line 3 is in the range of 0.1mm-0.5mm. The microstrip line 3 is located on the same side as the U-shaped microstrip line 2 .

[0033] generally considered, see image 3 , L 1 The length represented is the length of the bottom of the microstrip, L 2 The length excl...

Embodiment 3

[0038] The overall structure of the balanced broadband bandpass filter based on the multimode slot line resonator is the same as that of Example 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 . Two rectangular microstrip lines 3 that are mirror-symmetrical about the Y axis are printed between the microstrip bottoms of the two U-shaped microstrip lines 2, 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 line 3 and the U-shaped microstrip line 2 is 0.25 mm.

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Abstract

The invention proposes a balanced ultra-wideband bandpass filter based on a slot multimode resonator, which solves the problems of strong common mode interference, narrow passband, low selectivity and large size. The filter includes two U-shaped and rectangular microstrip lines printed on the upper surface of the dielectric substrate, and two first and second stepped impedance slot lines and multi-mode slot resonators are etched on the metal floor. The rectangular microstrip line is overlapped with the positions where the first and second stepped impedance slot lines are inserted on the metal base plate to form a three-line inter-fingered coupling structure. The invention uses the U-shaped microstrip to rectangular slot line structure to separate the common mode and the differential mode to achieve good common mode suppression; the three-line interdigital coupling structure strengthens the coupling of input and output signals; the multi-mode slot resonator is used to trap the filter. Feature adjustment. The invention has ultra-wide bandwidth, small size, high selectivity and good common mode suppression characteristics, and is applied in the fields of electromagnetic microwave and radio frequency circuits and systems.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic microwave and radio frequency, and mainly relates to a bandpass filter with small size and wide frequency band, in particular 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 filter is an important part of modern communication system, and the performance of the filter is related to the communication quality of the whole system. Among them, Ultra-wideband (UWB) filters with the advantages of small size, wide frequency band, and stable performance are widely used, and the strong penetrating power and anti-interference ability of signals are the significant advantages of UWB technology. In recent years, th...

Claims

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Application Information

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Patent Type & Authority Patents(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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