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Full-open-circuit branch transmission line bandwidth-adjustable non-reflection filter which

A technology of transmission line and filter, which is applied in the field of non-reflection filter with adjustable bandwidth of full-open stub transmission line, which can solve the problems of low operating frequency of non-reflection filter and unsuitable radio frequency and microwave frequency band, etc., and achieve high-order scalability and good filtering The effect of the characteristic

Active Publication Date: 2021-09-03
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the present invention: In order to solve the problem that the existing non-reflection filter has a low operating frequency and is not suitable for radio frequency and microwave frequency bands, the present invention proposes a full-open stub transmission line bandwidth adjustable non-reflection filter

Method used

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  • Full-open-circuit branch transmission line bandwidth-adjustable non-reflection filter which
  • Full-open-circuit branch transmission line bandwidth-adjustable non-reflection filter which
  • Full-open-circuit branch transmission line bandwidth-adjustable non-reflection filter which

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Embodiment 1

[0030] This embodiment adopts as figure 1 A fully open stub transmission line bandwidth-tunable non-reflection filter is shown, including a first port 1, a second port 2, a third port 3, a fourth port 4, four first quarter-wavelength transmission lines 5, Two quarter-wavelength open-circuit parallel stub lines 6, four second quarter-wavelength transmission lines 7, two quarter-wavelength open-circuit series stub lines 8 and inverters 9; One of the wavelength terminals is open-circuited and paralleled stub line 6 is cascaded on one side with two first quarter-wavelength transmission lines 5 to form the first band-stop branch and the second band-stop branch. For the convenience of understanding, the figure 1 The upper band-stop branch is called the first band-stop branch. In the first band-stop branch, two first quarter-wavelength transmission lines 5 are connected in series, and a quarter-wavelength terminal is open-circuited in parallel with the upper end of the stub line 6. ...

Embodiment 2

[0036] The circuit structure of this embodiment is the same as that of Embodiment 1, that is, figure 1 The center frequency of the bandwidth-adjustable non-reflection filter of a full-open stub transmission line shown is set to 1GHz, the first port 1 is used as the input port, and the remaining three ports are used as output ports. figure 1 The upper part is the first band-stop branch, the lower part is the second band-pass branch, the left side is the first band-pass branch, the right side is the second band-pass branch, the band-stop branch performs low-pass filtering, and the band-pass branch high-pass filtering; the inverter 9 is connected in series with the upper end of the second quarter-wavelength transmission line 7 on the upper part of the second bandpass branch, and the upper end of the inverter 9 is connected to the second port 2 .

[0037] But the element value of each element of the present embodiment: the impedance value of the first quarter wavelength transmissi...

Embodiment 3

[0040] The circuit structure of this embodiment is the same as that of Embodiment 1, that is, figure 1 The center frequency of the bandwidth-adjustable non-reflection filter of a full-open stub transmission line shown is set to 1GHz, the first port 1 is used as the input port, and the remaining three ports are used as output ports. figure 1 The upper part is the first band-stop branch, the lower part is the second band-pass branch, the left side is the first band-pass branch, the right side is the second band-pass branch, the band-stop branch performs low-pass filtering, and the band-pass branch high-pass filtering; the inverter 9 is connected in series with the upper end of the second quarter-wavelength transmission line 7 on the upper part of the second bandpass branch, and the upper end of the inverter 9 is connected to the second port 2 .

[0041] But the element value of each element of present embodiment: the impedance value of the first quarter-wavelength transmission l...

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Abstract

The invention discloses a full-open-circuit branch transmission line bandwidth-adjustable non-reflection filter which is characterized in that every two first quarter-wavelength transmission lines are cascaded to form two groups of transmission line pairs internally provided with connection points; two quarter-wavelength terminal open-circuit parallel branch lines are connected with the connection points of the transmission line pairs respectively to form two groups of band-stop branches; two sides of the two quarter-wavelength terminal open circuit series branch lines are cascaded with quarter-wavelength transmission lines to form two groups of band-pass branches; the two groups of band-stop branches and the two groups of band-pass branches are sequentially connected end to end to form a closed-loop structure, and any point on a main line of a loop is cascaded to an inverter. According to the invention, the influence caused by a stop-band reflection signal can be effectively reduced, the working frequency is relatively high, the filter is suitable for a radio frequency microwave frequency band, meanwhile, the filter has relatively good low-pass and high-pass filtering characteristics, and the bandwidth can be adjusted.

Description

technical field [0001] The invention belongs to the field of filters, and in particular relates to a fully open stub transmission line bandwidth adjustable non-reflection filter. Background technique [0002] A filter is an electronic device that is widely used in various electronic systems. The device generally has two ports that allow electrical signals in the passband to pass through without loss or with low loss, while prohibiting electrical signals in the stopband from being transmitted between the two ports. [0003] Existing filters are generally reflective. According to the law of energy conservation, if the input electrical signal at the input terminal is within the passband, it will be transmitted to the output terminal; when the input signal is within the stop band, it will be totally reflected to the input terminal, and there will be no signal output at the output terminal at this time. If the power of the reflected signal is large, after being reflected to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/06
CPCH03H7/06
Inventor 高鹏程郭稼逸金秀华黄晓东
Owner NANJING UNIV OF POSTS & TELECOMM
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