A Broadband Balanced Bandpass Filter with Reconfigurable Frequency and Bandwidth

A balanced band and filter technology, which is applied to waveguide devices, electrical components, circuits, etc., can solve problems such as limited performance, inability to meet the needs of broadband reconfigurable communication systems, and few research results on electronically adjustable balanced filters. Good electromagnetic compatibility

Inactive Publication Date: 2018-04-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 3) There are few existing research results on electronically adjustable balanced filters
Most of the published reconfigurable filter articles or patents are designed based on narrowband filters, which cannot meet the needs of wideband reconfigurable communication systems. For wideband reconfigurable filters, the proposed method and structure and the proposed Achieved limited performance
At present, the research on the fully adjustable balanced filter is still blank, and no scholars at home and abroad have proposed related designs.

Method used

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  • A Broadband Balanced Bandpass Filter with Reconfigurable Frequency and Bandwidth
  • A Broadband Balanced Bandpass Filter with Reconfigurable Frequency and Bandwidth
  • A Broadband Balanced Bandpass Filter with Reconfigurable Frequency and Bandwidth

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Experimental program
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Effect test

Embodiment 1

[0037] Such as figure 1 As shown, the broadband balanced bandpass filter of this embodiment includes an upper layer microstrip line structure 1 and an active circuit, a middle layer dielectric substrate (not shown in the figure), a lower layer ground metal patch 2 and metal vias 3, The metal through hole 3 runs through the microstrip line structure 1, the dielectric substrate and the grounded metal patch 2 in sequence, so that the microstrip line structure 1 and the grounded metal patch 2 are connected through the dielectric substrate. The microstrip line structure 1 includes Two three-mode resonators and two pairs of input / output feed lines, the two three-mode resonators and two pairs of input / output feed lines are bent, so that the entire microstrip line structure 1 is two left-right symmetrical E-type structure;

[0038] The two three-mode resonators are respectively a first three-mode resonator and a second three-mode resonator, and the first three-mode resonator includes...

Embodiment 2

[0050] Such as figure 1 As shown, by loading varactor diodes on the transmission line and stubs of the three-mode resonator to independently control the odd and even mode resonant frequencies, a wideband balanced bandpass filter with reconfigurable frequency and bandwidth (also known as Fully adjustable wideband balanced bandpass filter) with independently tuned center frequency and bandwidth. The circuit and electromagnetic simulation software of this embodiment is Agilent Advanced Design System (ADS). The broadband balanced bandpass filter with reconfigurable frequency and bandwidth is selected and processed on a dielectric substrate with a dielectric constant of 2.55, a thickness of 0.8mm, and a loss tangent of 0.0029. Figure 1 ~ Figure 3 The specific physical dimensions are shown in Table 1 below.

[0051]

[0052] Table 1 Dimensions of broadband balanced bandpass filter with reconfigurable frequency and bandwidth

[0053] This embodiment is measured by Agilent 5230...

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PUM

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Abstract

The invention discloses a frequency and bandwidth adjustable broadband balanced band pass filter. The filter comprises a microstrip line structure and an active circuit in the upper layer, a dielectric substrate in the middle layer, and a grounding metal paster and a metal through hole in the lower layer; the metal through hole penetrates the microstrip line structure, the dielectric substrate and the grounding metal paster successively so that the microstrip line structure is connected with the grounding metal paster via the dielectric substrate; the microstrip line structure comprises two three-mode resonators and two input / output feeder line pairs, the resonators and pairs are bent so that the whole microstrip line structure includes two E-shaped structures in left and right symmetry; and the grounding metal paster comprises a first defect ground structure and a second defect ground structure. According to the invention, the frequency and the bandwidth can be adjusted independently, the two sides of the passband include transmission zero points respectively, the rectangular degree and the selectivity of the filter are improved, a varator is introduced to an open-circuit branch, so that electrical control for the open-circuit structure is realized.

Description

technical field [0001] The invention relates to a broadband balanced bandpass filter, in particular to a broadband balanced bandpass filter with reconfigurable frequency and bandwidth applied in a broadband front-end system, belonging to the technical field of microwave communication. Background technique [0002] With the continuous development of modern wireless communication technology, electrically reconfigurable filters have attracted extensive attention from scholars at home and abroad. Traditional electronically tuned filters cannot freely adjust the bandwidth and cannot well adapt to the requirements of modern wireless systems. For this reason, a filter with the ability to adjust the center frequency and bandwidth at the same time was proposed. Its English name is fully tunable filter, which is translated as a fully tunable filter. This type of filter is one of the frontiers and trends in the research of electronically tunable filters, and there are only a few repor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203
CPCH01P1/20309
Inventor 褚庆昕陈志涵
Owner SOUTH CHINA UNIV OF TECH
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