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A Microstrip Pseudo-comb Bandpass Filter Structure

A technology of band-pass filtering and band-pass filter, which is applied in the electronic field, can solve the problems that the filter response suppression ability is difficult to further improve, the distance between adjacent resonators is large, and the distance between non-adjacent resonators is far away, so as to improve the out-of-band The effect of inhibition

Active Publication Date: 2019-04-02
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the traditional structure, the distance between adjacent resonators is large, which determines that the distance between non-adjacent resonators is also relatively long, making it difficult to further improve the suppression ability of the filter response at the high end of the passband.

Method used

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  • A Microstrip Pseudo-comb Bandpass Filter Structure
  • A Microstrip Pseudo-comb Bandpass Filter Structure
  • A Microstrip Pseudo-comb Bandpass Filter Structure

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Embodiment Construction

[0014] Such as figure 2 As shown, a kind of microstrip pseudo-comb bandpass filter structure of the present invention, on the basis of the traditional pseudo-comb line coupled bandpass filter structure, between two adjacent half-wavelength resonator 1 and 2 end faces, through A section of transmission line 3 is connected. An equivalent capacitance is respectively formed between the transmission line 3 and the resonator 1 and the resonator 2 via a coupling slot. The smaller the slit width and the wider the transmission line width, the larger the equivalent capacitance. The introduction of this equivalent capacitance will reduce the coupling between the corresponding two resonators, so that a new control variable other than the spacing between adjacent resonators is introduced for the coupling between adjacent resonators, so that the spacing between adjacent resonators become adjustable (one of the two control variables can be adjusted as long as the total contribution of the...

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Abstract

The invention discloses a microstrip pseudo comb line band-pass filtering structure. A transmission line is arranged between two adjacent half-wavelength resonator end faces of a microstrip pseudo comb line band-pass filter, so an equivalent capacitor is formed between the transmission line and each of the two adjacent resonators through a coupling slit. Compared with the prior art, the beneficial effects of the invention are that by use of the filter provided by the invention, the length is reduced by 1 / 4 compared with length of the current filter and the out-of-band rejection ability of the passband high end is improved.

Description

technical field [0001] The invention belongs to the field of electronic technology, in particular to a filter structure capable of reducing volume and improving out-of-band suppression. Background technique [0002] The existing microstrip pseudo-comb bandpass filter is generally implemented in the following ways: figure 1 As shown, the structure of the filter is characterized by the half-wavelength resonators arranged in parallel without interleaving in the manner shown in the figure. This structure has the following disadvantages: [0003] 1. Due to the weak coupling between resonators, the filter with this structure has a large distance between adjacent resonators when used in narrowband filtering applications. ( figure 1 (1) and (2) are a group of adjacent resonators, and the excessive distance between the resonators will result in an uncompact structure of the filter. [0004] 2. Non-adjacent resonators ( figure 1 (1) and (3)) are a group of non-adjacent resonators...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203
CPCH01P1/20381
Inventor 周俊
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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