WO2018171179A1 - Filtre passe-bande à deux bandes doté d'une sélectivité élevée - Google Patents

Filtre passe-bande à deux bandes doté d'une sélectivité élevée Download PDF

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Publication number
WO2018171179A1
WO2018171179A1 PCT/CN2017/107192 CN2017107192W WO2018171179A1 WO 2018171179 A1 WO2018171179 A1 WO 2018171179A1 CN 2017107192 W CN2017107192 W CN 2017107192W WO 2018171179 A1 WO2018171179 A1 WO 2018171179A1
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WO
WIPO (PCT)
Prior art keywords
pass filter
band pass
microstrip line
short
dual
Prior art date
Application number
PCT/CN2017/107192
Other languages
English (en)
Chinese (zh)
Inventor
曲美君
邓力
李书芳
张贯京
葛新科
高伟明
张红治
Original Assignee
深圳市景程信息科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市景程信息科技有限公司 filed Critical 深圳市景程信息科技有限公司
Publication of WO2018171179A1 publication Critical patent/WO2018171179A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters
    • H01P1/20327—Electromagnetic interstage coupling
    • H01P1/20354—Non-comb or non-interdigital filters

Definitions

  • the present invention relates to the field of radio frequency microwave communication technologies, and in particular, to a high selectivity dual band pass filter.
  • the filter can filter out-of-band noise and improve the sensitivity of the circuit system.
  • a microstrip filter is a device used to separate microwave signals of different frequencies. Its main function is to suppress unwanted signals so that they cannot pass through the filter and only pass the desired signal.
  • the performance of the filter has a large impact on the performance of the circuit system. Due to the diversity of communication bands in modern communication systems, the selectivity of prior art bandpass filters is often insufficient to meet the diversity of communication bands and affect the performance of the entire communication system.
  • each of the first microstrip lines are respectively provided with a circuit load and a short circuit load, and the middle portions of the two first microstrip lines are connected by the second microstrip line;
  • one end of the input end is disposed in a middle of one of the first microstrip lines and the other end of the input end extends to a long edge of the dielectric plate;
  • one end of the output end is disposed in a middle of another first microstrip line and the other end of the output end extends to another long edge of the dielectric plate;
  • Both ends of the second microstrip line are respectively connected to the input end and the output end, and are located on the same horizontal line, the water
  • the flat line is the first central axis, and the second central axis is perpendicular to the first central axis;
  • the end of the short-circuit load is provided with a short-circuited metal post that penetrates from the upper surface of the dielectric plate to the lower surface of the dielectric plate and is connected to the ground metal layer disposed on the lower surface of the dielectric plate.
  • the two first microstrip lines are disposed parallel to each other on the upper surface of the dielectric plate and are bilaterally symmetric with respect to the second central axis, and the two ends of the second microstrip line are vertically connected to the two A microstrip between the lines.
  • width W0 1.35mm
  • the short-circuited metal pillar has a column shape.
  • the dielectric plate is a PCB having a thickness of 0.762 mm and a relative dielectric constant of 3.66.
  • FIG. 2 is a schematic diagram showing the structure of the lower surface of the high-selectivity dual-band pass filter of the present invention.
  • FIG. 3 is a schematic diagram of S-parameter results of the high-selectivity dual-band pass filter of the present invention simulated by electromagnetic simulation software.
  • FIG. 1 is a schematic diagram showing the upper surface structure of the high-selectivity dual-band pass filter of the present invention.
  • the high-selectivity dual-band pass filter includes a dielectric plate 1, two first microstrip lines 10 etched on the upper surface of the dielectric plate 1, an input terminal P1, an output terminal P2, and a second micro A strip 11 and a ground metal layer 14 disposed on the lower surface of the dielectric plate (refer to FIG. 2).
  • the two ends of each of the first microstrip lines 10 are respectively provided with a bypass load 12 and a short-circuit load 13.
  • the middle portions of the two first microstrip lines 10 are connected by the second microstrip line 11, and one end of the input end P1 is disposed at One of the first microstrip lines 10 and the other end of the input end P1 extends to one long edge of the dielectric plate 1, and one end of the output end P2 is disposed at the middle of the other first microstrip line 10 and the output end The other end of P2 extends to the other long edge of the PCB board 2.
  • a short-circuited metal post 130 is disposed at the end of each of the short-circuit loads 13, and the short-circuited metal post 130 may have a columnar shape such as a cylindrical shape or a long cylindrical shape.
  • the dielectric plate 1 is a PCB board, and the specific plate type is Roger.
  • the two ends of the second microstrip line 11 are respectively connected to the input end PI and the output end P2 and are located on the same horizontal line ab.
  • the horizontal line ab is used as the first central axis ab.
  • the high-selectivity dual-band pass filter of the present invention is vertically symmetrical about the first central axis ab, and is bilaterally symmetric about the second central axis cd, and the first central axis ab and the second central axis cd are perpendicular to each other.
  • the high-selective dual-band pass filter of the present invention has four turn-on loads 12 and four Short-circuit load 13.
  • Four open circuit loads 12 and four short circuit loads 13 enable the high selectivity dual band pass filter of the present invention to have two stop bands in any operating frequency band, thereby enabling the highly selective dual band pass filter of the present invention It has dual frequency characteristics and high band pass selectivity.
  • the first microstrip line 10, the second microstrip line 11, the open circuit load 12, the short-circuit load 13, the input end P1, and the output end P2 are all metal strips of a strip structure.
  • the high-selectivity dual-band pass filter of the present invention is connected to the second microstrip line 11 via two first microstrip lines 12 with respect to the existing band pass filter, four turn-on loads 12 and four short-circuit loads 13.
  • the high-selectivity dual-band pass filter of the present invention can achieve a good matching effect in the operating frequency band.
  • the thickness of the metal copper plate disposed on the PCB board is generally um level, so the present invention does not apply to the first microstrip line 10, the second microstrip line 11, the open circuit load 12, the short-circuit load 13, and the input end.
  • the thickness of the metal copper of P1 and the output terminal P2 is limited, and does not affect the characteristics of the high-selectivity dual-band pass filter of the present invention.
  • FIG. 2 is a schematic diagram showing the structure of the lower surface of the high-selectivity dual-band pass filter of the present invention.
  • the short-circuited metal post 130 at the end of each short-circuit load 13 penetrates from the upper surface of the dielectric plate 1 to the lower surface of the dielectric plate 1, and is connected to the ground metal layer 14 of the lower surface of the dielectric plate 1, the ground metal layer.
  • 14 is a copper-clad metal layer laid on the lower surface of the dielectric plate 1.
  • the high-selectivity dual-band pass filter of the present invention is designed by the above structure, by loading four turn-on loads 12 and four short-circuit loads 13 on a conventional microstrip line, by adjusting the switch load 12 and The length and width of the short-circuit load 13 can form a transmission zero in a specific operating frequency band, so that the original microstrip line has filtering performance, can have a good suppression effect on the out-of-band signal, has high selectivity to the passband signal, and introduces more Less noise, avoiding interference to the RF front end.
  • FIG. 3 is a schematic diagram of S-parameter results of the high-selectivity dual-band pass filter of the present invention simulated by electromagnetic simulation software.
  • bandpass filters allow signals from different frequency bands to enter the system, filtering out of the out-of-band signals or noise.
  • the reflection coefficient (IS11I) of the high-selectivity dual-band pass filter of the present invention is below -10 dB in the range of 2.61 GHz to 3.23 GHz and in the range of 4.75 GHz to 5.02 GHz, indicating that the height is high.
  • the selective dual band pass filter can operate from 2.61 GHz to 3.23 GHz and from 4.75 GHz to 5.02 GHz, thus enabling dual frequency characteristics.
  • the high-selectivity dual-band pass filter of the present invention loads four turn-on loads 12 and four short-circuit loads 13 on two microstrip lines by adjusting the lengths of the turn-on load 12 and the short-circuit load 13
  • the width can form a transmission zero in a specific frequency band, so that the original microstrip line has filtering performance, thereby having higher band pass selectivity.
  • the high-selectivity dual-band pass filter of the present invention connects four turn-on loads 12 and four short-circuit loads 13 to the conventional microstrip line through two first microstrip lines 12 with respect to the existing band pass filter. And by changing the length and width of the microstrip line, the high-selectivity dual-band pass filter of the present invention can achieve a good matching effect in the operating frequency band.
  • the high selectivity dual band pass filter achieves a good matching effect in the operating frequency band.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

La présente invention concerne un filtre passe-bande à deux bandes doté d'une sélectivité élevée, comprenant deux premières lignes microruban, une extrémité d'entrée, une extrémité de sortie et une seconde ligne microruban disposée sur la surface supérieure d'une plaque diélectrique. Les deux extrémités de chaque première ligne microruban sont pourvues d'une charge ouverte et d'une charge court-circuitée, respectivement ; les parties médianes des deux premières lignes microruban sont connectées au moyen de la seconde ligne microruban ; l'extrémité d'entrée est connectée à l'une des premières lignes microruban, et l'extrémité de sortie est connectée à l'autre première ligne microruban ; les deux extrémités de la seconde ligne microruban sont respectivement en communication avec l'extrémité d'entrée et l'extrémité de sortie, et sont situées sur la même ligne horizontale ; la ligne horizontale sert de premier axe central ; un second axe central est perpendiculaire au premier axe central ; l'extrémité de queue de la charge court-circuitée est pourvue d'un montant métallique court-circuité, qui est connecté à une couche métallique de masse disposée sur la surface inférieure de la plaque diélectrique. Le filtre passe-bande à deux bandes doté d'une sélectivité élevée de la présente invention exerce un bon effet de suppression sur des signaux hors bande, a une sélectivité élevée, introduit moins de bruit, et évite une interférence à une extrémité avant radiofréquence.
PCT/CN2017/107192 2017-03-18 2017-10-21 Filtre passe-bande à deux bandes doté d'une sélectivité élevée WO2018171179A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201710162778.6A CN106921012B (zh) 2017-03-18 2017-03-18 高选择性双频带通滤波器
CN201710162778.6 2017-03-18

Publications (1)

Publication Number Publication Date
WO2018171179A1 true WO2018171179A1 (fr) 2018-09-27

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CN (1) CN106921012B (fr)
WO (1) WO2018171179A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206673067U (zh) * 2017-03-18 2017-11-24 深圳市景程信息科技有限公司 基于开路负载和短路负载的双频带通滤波器
CN106921012B (zh) * 2017-03-18 2019-03-26 深圳市景程信息科技有限公司 高选择性双频带通滤波器
JPWO2019215970A1 (ja) * 2018-05-08 2021-06-24 ソニーグループ株式会社 フィルタ回路及び通信装置

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CN105206905A (zh) * 2015-08-25 2015-12-30 南京理工大学 一种基于交叉型多模谐振器的宽阻带三模双通带滤波器
CN105514545A (zh) * 2016-01-19 2016-04-20 南京航空航天大学 一种紧凑型宽阻带高选择性微带滤波器
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