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WO2018171231A1 - Filtre passe-bande à deux bandes basé sur des charges ouvertes et des charges de court-circuit - Google Patents

Filtre passe-bande à deux bandes basé sur des charges ouvertes et des charges de court-circuit Download PDF

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Publication number
WO2018171231A1
WO2018171231A1 PCT/CN2017/111487 CN2017111487W WO2018171231A1 WO 2018171231 A1 WO2018171231 A1 WO 2018171231A1 CN 2017111487 W CN2017111487 W CN 2017111487W WO 2018171231 A1 WO2018171231 A1 WO 2018171231A1
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WO
WIPO (PCT)
Prior art keywords
short
load
circuit load
pass filter
dual
Prior art date
Application number
PCT/CN2017/111487
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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 WO2018171231A1 publication Critical patent/WO2018171231A1/fr

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Definitions

  • Dual band pass filter based on open circuit load and short circuit load
  • the present invention relates to the field of radio frequency microwave communication technologies, and in particular, to a dual band pass filter based on a circuit load and a short circuit load.
  • 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.
  • the present invention provides a dual band pass filter based on a circuit load and a short circuit load, including a dielectric plate, two first microstrip lines etched on the surface of the dielectric plate, and an input. a terminal, an output end and a second microstrip line, and a ground metal layer disposed on a lower surface of the dielectric plate, the dual band pass filter being vertically symmetrical about the first central axis and bilaterally symmetric about the second central axis, wherein:
  • 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 bypass load and one end of the short-circuit load are disposed at opposite ends of the first microstrip line at mutually orthogonal angles and are connected to each other;
  • 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 the middle of the other first microstrip line and the other end of the output end extends to the other 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 horizontal line is a 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 ground metal layer is a copper-clad metal layer laid on a 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.
  • the number of one end of the bypass load and the number of short-circuit loads are four, and one end load and one short-circuit load are respectively disposed at two ends of each first microstrip line.
  • the first microstrip line, the second microstrip line, the crotch load, the short-circuit load, the input end, and the output end are all metal strips of a strip structure.
  • the length of the first microstrip line is 46.66 mm
  • the width is W
  • width W. 1.35mm
  • the short-circuited metal pillar has a column shape.
  • the dual-band pass filter based on the open circuit load and the short circuit load of the present invention loads four open circuit loads and four short circuit loads on two microstrip lines, and is adjusted by
  • the length and width of the circuit load and the short-circuit load can form a transmission zero point in a specific frequency band, so that the original microstrip line has filtering performance, thereby having high band-pass selectivity, and can have a good suppression effect on the out-of-band signal. It has high selectivity and introduces less noise to avoid interference with the RF front end.
  • the dual band pass filter of the present invention is connected to the conventional microstrip line through two first microstrip lines with respect to the existing band pass filter, and four microcircuit loads are connected, and the microstrip is changed by The length and width of the line can make The dual-band pass filter achieves a good matching effect in the operating frequency band.
  • FIG. 1 is a schematic diagram of an upper surface structure of a dual band pass filter based on a bypass load and a short circuit load according to the present invention
  • FIG. 2 is a schematic view showing a lower surface structure of a dual band pass filter based on a bypass load and a short circuit load according to the present invention
  • FIG. 3 is a schematic diagram of S-parameter results of the simulation of the electromagnetic simulation software of the dual-band pass filter based on the open-circuit load and the short-circuit load of the present invention.
  • FIG. 1 is a schematic diagram showing the upper surface structure of a dual-band pass filter based on a bypass load and a short-circuit load according to the present invention.
  • the dual-band pass filter based on the circuit load and the short-circuit load includes a dielectric plate 1, two first microstrip lines 10 etched on the upper surface of the dielectric plate 1, an input end P1, and an output end. P2 and a second microstrip line 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 PC B board 2.
  • a short-circuited metal post 130 is disposed at the end of each of the short-circuit loads 13, and the short-circuit metal post 130 may have a columnar shape such as a cylindrical shape or a long cylindrical shape.
  • the dielectric plate 1 is a P CB plate, and the specific plate type is Roger.
  • RO4350B which has a relative dielectric constant of 3.66 and a plate thickness of 0.762 mm.
  • 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 dual-band pass filter based on the ramp load and the short-circuit load of the present invention is vertically symmetrical about the first central axis ab, and about the second central axis
  • the cd is bilaterally symmetrical, and the first central axis ab and the second central axis cd are perpendicular to each other.
  • the two first microstrip lines 10 are disposed in parallel with each other on the upper surface of the dielectric plate 1 and are symmetric with respect to the second central axis cd, and the second microstrip line 11 and the two first microstrip lines 10 are perpendicularly connected to each other.
  • One end of the bypass load 12 and one end of the short-circuit load 13 are disposed at both ends of each of the first microstrip lines 10 at an arbitrary angle of intersection and communicate with each other.
  • one end of the bypass load 12 and one end of the short-circuit load 13 are disposed at opposite ends of each of the first microstrip lines 10 at mutually orthogonal angles and communicate with each other.
  • the long edge of the dielectric plate 1 defined by the present embodiment refers to the two edges of the dielectric plate 1 parallel to the second central axis cd.
  • the two first microstrip lines 10 are spaced apart by a distance equal to the length of the second microstrip line 11.
  • the distance between the bypass load 12 and the short-circuit load 13 is smaller than the two first microstrips. The separation distance between the lines 10.
  • the dual-band pass filter of the present invention Since both ends of the two first microstrip lines 10 are provided with a bypass load 12 and a short-circuit load 13, the dual-band pass filter of the present invention has four open circuit loads 12 and four short-circuit loads. 13.
  • the four-way load 12 and the four short-circuit loads 13 enable the dual-band pass filter of the present invention to have two stop bands in any working frequency band, so that the dual-band pass filter of the present invention has dual frequency characteristics. , with 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 dual band pass filter based on the ramp load and the short circuit load of the present invention is connected to the four band load 12 and the four short circuit loads 13 through the two first microstrip lines 12 with respect to the existing band pass filter.
  • the dual band pass filter based on the open circuit load and the short circuit load of the present invention can achieve a good matching effect in the working frequency band.
  • the present invention takes the dual frequency characteristic of the operating frequency band in the range of 2.61 GHz to 3.23 GHz and in the range of 4.75 GHz to 5.02 GHz as an example, and the first microstrip disposed on the upper surface of the dielectric board 1 by way of a specific embodiment.
  • the length of the second microstrip line 11 is! ⁇ .
  • 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 winding load 12, the short-circuit load 13,
  • the thickness of the metal copper of the input terminal P1 and the output terminal P2 is limited, and does not affect the characteristics of the dual-band pass filter based on the bypass load and the short-circuit load of the present invention.
  • FIG. 2 is a schematic diagram showing the structure of the lower surface of the dual band pass filter based on the open circuit load and the short circuit load 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 The metal layer 14 is a copper-clad metal layer laid on the lower surface of the dielectric plate 1.
  • the dual-band pass filter based on the ramp load and the short-circuit load according to the present invention is designed by the above structure, by loading four open circuit loads 12 and four short-circuit loads 13 on the conventional microstrip line, Adjusting the length and width of the circuit load 12 and the short-circuit load 13 can form a transmission zero point 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, and has a high passband signal. Selectivity, introduce less noise, and avoid interference with the RF front end.
  • FIG. 3 is a schematic diagram of S-parameter results simulated by the electromagnetic simulation software of the dual-band pass filter based on the open-circuit load and the short-circuit load of the present invention.
  • bandpass filters allow different frequency band signals to enter the system, filtering out of the out-of-band signals or noise.
  • the reflection coefficient (IS11I) of the dual-band pass filter based on the ramp load and the short-circuit load of the present invention is in the range of 2.61 GHz to 3.23 GHz and in the range of 4.75 GHz to 5.02 GHz.
  • the dual-band pass filter can operate in the range of 2.61 GHz to 3.23 GHz and in the range of 4.75 GHz to 5.02 GHz, so that the dual frequency characteristic can be realized.
  • the transmission characteristics (IS21I) of the dual-band pass filter of the present invention can reach -35.8dB, at 4.13GHz, IS21I can reach SJ-50.6dB, and at 5.27GHz, IS21I can reach SJ- 34dB, so the dual band pass filter of the present invention has high selectivity.
  • the dual-band pass filter based on the ramp load and the short-circuit load of the present invention can have a good suppression effect on the out-of-band signal, has high selectivity to the passband signal, introduces less noise, and avoids the RF front end. This causes interference and therefore greatly improves the performance of the microwave circuit.
  • the dual-band pass filter based on the coast load and the short-circuit load of the present invention loads four turn-on loads 12 and four short-circuit loads 13 on two microstrip lines, by adjusting the turn-on load 12 and Short-circuit load 13
  • the length and width can form a transmission zero in a specific frequency band, so that the original microstrip line has filtering performance, thereby having a higher band pass selectivity.
  • the dual band pass filter of the present invention connects four turnkey 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 dual band pass filter of the present invention can achieve a good matching effect in the working frequency band.
  • the dual-band pass filter based on the coast load and the short-circuit load of the present invention loads four turn-on loads and four short-circuit loads on two microstrip lines, and adjusts
  • the length and width of the circuit load and the short-circuit load can form a transmission zero point in a specific frequency band, so that the original microstrip line has filtering performance, thereby having high band-pass selectivity, and can have a good suppression effect on the out-of-band signal. It has high selectivity and introduces less noise to avoid interference with the RF front end.
  • the dual band pass filter of the present invention is connected to the conventional microstrip line through two first microstrip lines with respect to the existing band pass filter, and four microcircuit loads are connected, and the microstrip is changed by The length and width of the line enable the dual band pass filter to achieve a good match in the operating band.

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Abstract

Le présent modèle d'utilité concerne un filtre passe-bande à deux bandes basé sur des charges ouvertes et des charges de court-circuit, comprenant deux premières lignes microruban, une extrémité d'entrée, une extrémité de sortie et une seconde ligne microruban qui sont formées sur la surface supérieure d'une plaque diélectrique au moyen d'une gravure. Deux extrémités de chaque première ligne microruban sont respectivement pourvues d'une charge ouverte et d'une charge de court-circuit ; 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 ; deux extrémités des secondes lignes microruban sont respectivement en communication avec l'extrémité d'entrée et l'extrémité de sortie, et sont situées au niveau d'une même ligne horizontale, qui sert de premier axe central ; un second axe central est vertical par rapport au premier axe central ; l'extrémité de la charge de court-circuit est pourvue d'un montant métallique de court-circuit, 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 dans le présent modèle d'utilité applique un bon effet inhibiteur sur des signaux hors bande, permet d'obtenir une sélectivité élevée, introduit moins de bruit, et évite une interférence à une extrémité avant radiofréquence.
PCT/CN2017/111487 2017-03-18 2017-11-17 Filtre passe-bande à deux bandes basé sur des charges ouvertes et des charges de court-circuit WO2018171231A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201720265249.4 2017-03-18
CN201720265249.4U CN206673067U (zh) 2017-03-18 2017-03-18 基于开路负载和短路负载的双频带通滤波器

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WO2018171231A1 true WO2018171231A1 (fr) 2018-09-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109728394A (zh) * 2018-12-08 2019-05-07 广东盛路通信科技股份有限公司 带功率分配功能的微带合路器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202308232U (zh) * 2011-10-21 2012-07-04 南京航空航天大学 一种双频带微波滤波器
CN203351718U (zh) * 2013-06-20 2013-12-18 南京航空航天大学 一种高选择性、高共模抑制的阶梯阻抗梳状线平衡微带带通滤波器
CN205752465U (zh) * 2016-06-22 2016-11-30 东北大学 基于平行耦合线和开路枝节的差分滤波器
CN106921012A (zh) * 2017-03-18 2017-07-04 深圳市景程信息科技有限公司 高选择性双频带通滤波器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202308232U (zh) * 2011-10-21 2012-07-04 南京航空航天大学 一种双频带微波滤波器
CN203351718U (zh) * 2013-06-20 2013-12-18 南京航空航天大学 一种高选择性、高共模抑制的阶梯阻抗梳状线平衡微带带通滤波器
CN205752465U (zh) * 2016-06-22 2016-11-30 东北大学 基于平行耦合线和开路枝节的差分滤波器
CN106921012A (zh) * 2017-03-18 2017-07-04 深圳市景程信息科技有限公司 高选择性双频带通滤波器

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109728394A (zh) * 2018-12-08 2019-05-07 广东盛路通信科技股份有限公司 带功率分配功能的微带合路器
CN109728394B (zh) * 2018-12-08 2023-08-04 广东盛路通信科技股份有限公司 带功率分配功能的微带合路器

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