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WO2018188292A1 - Filtre passe-bande à large bande ayant une fonction de suppression hors bande à large bande - Google Patents

Filtre passe-bande à large bande ayant une fonction de suppression hors bande à large bande Download PDF

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Publication number
WO2018188292A1
WO2018188292A1 PCT/CN2017/106224 CN2017106224W WO2018188292A1 WO 2018188292 A1 WO2018188292 A1 WO 2018188292A1 CN 2017106224 W CN2017106224 W CN 2017106224W WO 2018188292 A1 WO2018188292 A1 WO 2018188292A1
Authority
WO
WIPO (PCT)
Prior art keywords
microstrip line
broadband
microstrip
band
bandpass filter
Prior art date
Application number
PCT/CN2017/106224
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 WO2018188292A1 publication Critical patent/WO2018188292A1/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

Definitions

  • the present invention relates to the field of microwave communication technologies, and in particular, to a wideband band pass filter having wideband out-of-band rejection.
  • 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.
  • the out-of-band rejection of the filter is an important indicator of impact, while the out-of-band rejection of existing filters is poor, which affects the performance of the entire communication system. Therefore, there is a need for a wideband bandpass filter with high bandwidth out-of-band rejection.
  • An object of the present invention is to provide a wideband band pass filter having wideband out-of-band rejection, which aims to solve the technical problem of poor band-band rejection performance of a band pass filter in the prior art.
  • the present invention provides a broadband band pass filter having broadband out-of-band rejection, comprising two first microstrip lines, two second microstrip lines, and two disposed on a surface of a dielectric board. a third microstrip line, two fourth microstrip lines, two fifth microstrip lines, a sixth microstrip line, and two signal transmission ends, the wideband band pass filter having wideband out-of-band rejection
  • the central axis is bilaterally symmetric, and the central axis is a line connecting the midpoints of the upper and lower horizontal borders of the broadband band pass filter, wherein:
  • each of the first microstrip lines is connected to one end of a second microstrip line and forms a double-branched matching circuit load, and the other end of each second microstrip line and a signal output end and
  • a third microstrip line is vertically connected, and each of the fourth microstrip lines is disposed in parallel above a third microstrip line and forms a coupling structure, one end of each fourth microstrip line and a fifth One end of the microstrip line is connected, the sixth microstrip line The two ends are respectively connected to the other end of a fifth microstrip line.
  • the two first microstrip lines and the two second microstrip lines are both parallel to the left and right vertical borders of the broadband band pass filter.
  • the two third microstrip lines, two fourth microstrip lines, two fifth microstrip lines, one sixth microstrip line, and two signal transmission ends are connected to the broadband
  • the upper and lower horizontal borders of the band pass filter are parallel.
  • the wideband bandpass filter with wideband out-of-band rejection includes two double-branch-matching loop loads and two coupling structures.
  • the two signal transmission ends are used for inputting and outputting signals, wherein one signal transmission end serves as a signal input end, and the other signal transmission end serves as a signal output end.
  • the first microstrip line, the second microstrip line, the third microstrip line, the fourth microstrip line, the fifth microstrip line, the sixth microstrip line, and the signal transmission end are all strips Metal copper sheet with a structure.
  • each first microstrip line has an impedance of 34 ⁇
  • each second microstrip line has an impedance of 68 ⁇
  • each fifth microstrip line has an impedance of 78 ⁇
  • each of the sixth microstrip lines The impedance is 83 ⁇
  • the odd mode impedance of each coupling structure 22 is 60 ⁇
  • the even mode impedance of each coupling structure 22 is 180 ⁇
  • the electrical length of each coupling structure 22 is 90 degrees.
  • the dielectric plate is a PCB having a thickness of 0.762 mm and a relative dielectric constant of 3.66.
  • the wideband bandpass filter with wideband out-of-band rejection according to the present invention can be formed in a specific operating frequency band by designing two double-branched matching circuit load and two coupling structures.
  • Broadband out-of-band rejection which makes the original microstrip line have filtering performance and can have good signal for out-of-band signals.
  • the suppression effect has high selectivity to the passband signal and introduces less noise to avoid interference to the RF front end.
  • FIG. 1 is a schematic structural view of a preferred embodiment of a broadband bandpass filter having broadband out-of-band rejection according to the present invention.
  • FIG. 2 is a schematic illustration of the dimensions of various components of a preferred embodiment of a broadband bandpass filter having broadband out-of-band rejection in accordance with the present invention.
  • FIG. 3 is a circuit schematic diagram of a preferred embodiment of a wideband bandpass filter with wideband out-of-band rejection of the present invention.
  • FIG. 4 is a schematic diagram showing the results of S-parameters of a broadband band-pass filter with broadband out-of-band rejection of the present invention simulated by electromagnetic simulation software.
  • FIG. 1 is a schematic structural view of a preferred embodiment of a broadband bandpass filter having broadband out-of-band rejection according to the present invention
  • FIG. 2 is a broadband bandpass filter having wideband out-of-band rejection of the present invention.
  • Figure 3 is a circuit schematic of a preferred embodiment of a broadband bandpass filter having broadband out-of-band rejection in accordance with the present invention.
  • the broadband bandpass filter 1 having broadband out-of-band rejection includes two first microstrip lines 101, two second microstrip lines 102, and two disposed on the surface of the dielectric board 1.
  • the broadband bandpass filter 1 having broadband out-of-band rejection is bilaterally symmetric about a central axis, which is a line connecting the midpoints of the upper and lower horizontal borders of the broadband bandpass filter 1 (ie, a line a-b) in FIG. 1, the two first microstrip lines 101 and the two second microstrip lines 102 are both parallel to the left and right vertical borders of the broadband bandpass filter 1, Two third microstrip lines 103, two fourth microstrip lines 104, two fifth microstrip lines 105, one sixth microstrip line 106, and two signal transmission ends P are both bandpass filtered The upper and lower horizontal borders of the device 1 are parallel.
  • the broadband bandpass filter 1 having the central axis in the broadband out-of-band rejection is not a component of metal, but is produced or designed.
  • the user can conveniently connect the components on the broadband bandpass filter 1 (for example, two first microstrip lines 101, two second microstrip lines 102, two third microstrip lines 103, two fourth The microstrip line 104, the two fifth microstrip lines 105, one sixth microstrip line 106, and the two signal transmission ends P) are bilaterally symmetrical about the central axis.
  • the central axis does not participate in any operation such as signal filtering.
  • the central axis is for the convenience of describing the left-right symmetric structure of the broadband band pass filter 1.
  • each of the first microstrip lines 101 is connected to one end of a second microstrip line 102 and forms a double-branched matching circuit load 20, and the other end of each second microstrip line 102 and one
  • the signal output terminal P and a third microstrip line 103 are vertically connected, and each of the fourth microstrip lines 104 is disposed in parallel above a third microstrip line 103 and forms a coupling structure, and each fourth microstrip One end of the line 104 is connected to one end of a fifth microstrip line 105, and both ends of the sixth microstrip line 106 are respectively connected to the other end of a fifth microstrip line 105.
  • the dielectric plate 1 is a PCB board, and the specific plate type is Roger RO4350B, wherein the relative dielectric constant is 3.66, and the plate thickness is 0.762 mm.
  • the signal transmission end P is a metal copper piece of a strip structure.
  • the wideband bandpass filter with wideband out-of-band rejection according to the present invention can achieve wideband bandpass filtering with wideband out-of-band rejection according to the present invention by changing the length and width of the microstrip line relative to the existing bandpass filter.
  • Device 1 achieves a good match in the operating band.
  • the operating band of the broadband bandpass filter 1 is in the range of 1.88 GHz to 4.12 GHz.
  • the first microstrip line 101 disposed on the surface of the dielectric board 1 and the second embodiment are described by way of specific embodiments.
  • the thickness of the metal copper plate disposed on the PCB board is generally um, so the present invention does not apply to the first microstrip line 101, the second microstrip line 102, and the third microstrip line 103,
  • the thickness of the metal copper piece of the length and width of the fourth microstrip line 104, the fifth microstrip line 105, the sixth microstrip line 106, and the signal transmission end P is limited, and does not affect the broadband having broadband out-of-band rejection according to the present invention. Band pass filter characteristics.
  • two signal transmission terminals P are used for signal input and output, wherein one signal transmission terminal P serves as a signal input terminal, and the other signal transmission terminal P serves as a signal output terminal.
  • the signal input end may be the signal transmission end P on the left side in FIG. 1 or the signal transmission end P on the right side; the signal output end may be the signal transmission end P on the left side in FIG. 1 or the signal transmission on the right side. End P.
  • the signal transmission terminal P on the left side of FIG. 1 serves as a signal input terminal
  • the signal transmission terminal P on the right side of FIG. 1 serves as a signal output terminal
  • the signal enters from the signal transmission terminal P on the left side, and is output from the signal transmission terminal P on the right side.
  • the signal transmission terminal P on the left side of Fig. 1 is used as the signal output terminal
  • the signal transmission terminal P on the right side of Fig. 1 serves as a signal input terminal, and the signal enters from the signal transmission terminal P on the right side, and is output from the signal transmission terminal P on the left side.
  • a first microstrip line 101 and a second microstrip line 102 form a double-branched matching circuit load 20, a third microstrip line 103 and a The fourth microstrip line 104 forms a coupling structure 22.
  • the wideband bandpass filter 1 having wideband out-of-band rejection includes two double-branch-matching ramp loads 20 and two coupling structures 22.
  • the impedance of each of the first microstrip lines 101 is 34 ohms ( ⁇ )
  • the impedance of each of the second microstrip lines 102 is 68 ohms ( ⁇ )
  • each of the fifth microstrips The impedance of line 105 is 78 ohms ( ⁇ )
  • the impedance of each sixth microstrip line 106 is 83 ohms ( ⁇ )
  • the odd mode impedance of each coupling structure 22 is 60 ohms ( ⁇ ), for each coupling structure 22
  • the even mode impedance is 180 ohms ( ⁇ ) and the electrical length of each coupling structure 22 is 90 degrees.
  • the wideband bandpass filter with wideband out-of-band rejection according to the present invention can be designed to form broadband out-of-band rejection in a specific operating frequency band by designing two double-branched matching circuit load 20 and two coupling structures 22.
  • the characteristics make the original microstrip line have filtering performance, can have a good suppression effect on the out-of-band signal, have high selectivity to the passband signal, introduce less noise, and avoid interference to the RF front end.
  • FIG. 4 is a schematic diagram of S-parameter results of a broadband bandpass filter with broadband out-of-band rejection according to the present invention simulated by electromagnetic simulation software.
  • the wideband bandpass filter 1 with wideband out-of-band rejection has a relative bandwidth of 74.67% between 1.88 GHz and 4.12 GHz in the operating band.
  • IS11I is less than -10dB outside the operating band and below 1.64GHz
  • IS12I is less than -10dB between 4.36GHz and 7.64GHz in the operating band.
  • the broadband band The pass filter 1 has a broadband out-of-band rejection characteristic. It can be seen that the wideband bandpass filter with wideband out-of-band rejection 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 interference to the RF front end.
  • the wideband band pass filter with wideband out-of-band rejection of the present invention can be formed in a specific operating frequency band by designing two double-branch joint matching circuit loads and two coupling structures.
  • the broadband out-of-band rejection feature makes the original microstrip line have filtering performance, which can have a good suppression effect on the out-of-band signal, high selectivity to the passband signal, introduce less noise, and avoid interference to the RF front end.

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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 large bande ayant une fonction de suppression hors bande à large bande. Le filtre passe-bande à large bande est bilatéralement symétrique par rapport à un axe central. Une extrémité de chaque première ligne microruban est connectée à une extrémité d'une seconde ligne microruban pour former une charge de circuit ouvert correspondante à double branche; l'autre extrémité de chaque seconde ligne microruban est connectée verticalement à une extrémité de sortie de signal et à une troisième ligne microruban; chaque quatrième ligne microruban est disposée au-dessus de la troisième ligne microruban en parallèle pour former une structure de couplage; une extrémité de chaque quatrième ligne microruban est connectée à une extrémité d'une cinquième ligne microruban; les deux extrémités de la sixième ligne microruban sont connectées séparément à l'autre extrémité de la cinquième ligne microruban. Le filtre passe-bande à large bande de la présente invention peut réaliser une fonction de suppression hors bande à large bande dans une bande de fonctionnement spécifique de sorte que les lignes microruban d'origine présentent des performances de filtrage, et peut avoir un bon effet de suppression de signal hors bande, avoir une sélectivité élevée pour des signaux passe-bande, introduire moins de bruit, et empêcher une interférence provoquée par une extrémité avant radiofréquence.
PCT/CN2017/106224 2017-04-15 2017-10-14 Filtre passe-bande à large bande ayant une fonction de suppression hors bande à large bande WO2018188292A1 (fr)

Applications Claiming Priority (2)

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CN201710246488.X 2017-04-15
CN201710246488.XA CN107196024A (zh) 2017-04-15 2017-04-15 具有宽带带外抑制的宽带带通滤波器

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107196671A (zh) * 2017-04-15 2017-09-22 深圳市景程信息科技有限公司 具有宽带带外抑制的信号发射装置
CN107196024A (zh) * 2017-04-15 2017-09-22 深圳市景程信息科技有限公司 具有宽带带外抑制的宽带带通滤波器
CN206673944U (zh) * 2017-04-15 2017-11-24 深圳市景程信息科技有限公司 基于双枝节匹配开路负载及耦合结构的信号发射装置
CN108428979A (zh) * 2018-04-26 2018-08-21 电子科技大学 一种微带带通滤波器及其设计方法
CN111144033A (zh) * 2020-01-15 2020-05-12 河南师范大学 一种高选择性宽带带通滤波器的设计方法

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CN107196024A (zh) * 2017-04-15 2017-09-22 深圳市景程信息科技有限公司 具有宽带带外抑制的宽带带通滤波器

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US20160294029A1 (en) * 2010-05-17 2016-10-06 Resonant Inc. Mixed resonator monolithic band-pass filter with enhanced rejection
CN103035986A (zh) * 2012-12-15 2013-04-10 华南理工大学 基于双枝节加载谐振器的超宽带滤波器
CN203166046U (zh) * 2012-12-15 2013-08-28 华南理工大学 基于双枝节加载谐振器的超宽带滤波器
CN104282970A (zh) * 2013-07-12 2015-01-14 中兴通讯股份有限公司 一种dbr滤波器及dbr双工器
CN106169635A (zh) * 2016-08-13 2016-11-30 南京理工大学 一种具有陷波特性的小型超宽带带通滤波器
CN107196671A (zh) * 2017-04-15 2017-09-22 深圳市景程信息科技有限公司 具有宽带带外抑制的信号发射装置
CN107196024A (zh) * 2017-04-15 2017-09-22 深圳市景程信息科技有限公司 具有宽带带外抑制的宽带带通滤波器

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