WO2018233227A1 - Filtre passe-bande à bande large chargé avec une ligne microruban couplée à trois branches - Google Patents

Filtre passe-bande à bande large chargé avec une ligne microruban couplée à trois branches Download PDF

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Publication number
WO2018233227A1
WO2018233227A1 PCT/CN2017/114057 CN2017114057W WO2018233227A1 WO 2018233227 A1 WO2018233227 A1 WO 2018233227A1 CN 2017114057 W CN2017114057 W CN 2017114057W WO 2018233227 A1 WO2018233227 A1 WO 2018233227A1
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WO
WIPO (PCT)
Prior art keywords
microstrip line
microstrip
lines
bandpass filter
line
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Application number
PCT/CN2017/114057
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English (en)
Chinese (zh)
Inventor
曲美君
邓力
李书芳
张贯京
葛新科
张红治
Original Assignee
深圳市景程信息科技有限公司
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Publication of WO2018233227A1 publication Critical patent/WO2018233227A1/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 microwave communication technologies, and in particular, to a wideband bandpass filter for loading a three-segment coupled microstrip line.
  • 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 selective performance of the filter on the passband signal is an important indicator of influence, while the existing filter has a poor selectivity for the passband signal, which affects the performance of the entire communication system.
  • the present invention provides a broadband bandpass filter for loading a three-segment coupled microstrip line, comprising two first microstrip lines and two second microstrip lines disposed on a surface of the dielectric plate.
  • the band pass filter is bilaterally symmetric about a first central axis, the wide band pass filter being vertically symmetrical about a second central axis, the first central axis being a midpoint of upper and lower horizontal borders of the broadband band pass filter
  • the second central axis is a line connecting the midpoints of the left and right longitudinal frames of the broadband band pass filter, wherein:
  • each of the two sixth microstrip lines and the two seventh microstrip lines are parallel to the second central axis; [0006] One end of each of the first microstrip lines is connected to one signal output end, and the other end of each of the first microstrip lines and one end of a second microstrip line and one end of a third microstrip line Connecting, each fourth microstrip line is disposed in a gap formed between a second microstrip line and a third microstrip line, one end of each fourth microstrip line and a fifth microstrip line One end of the fifth microstrip line is connected to one end of the other fifth microstrip line, and one end of each sixth microstrip line is vertically connected to the connection position of the two fifth microstrip lines, each with The other end of the sixth microstrip line is connected to one end of a seventh microstrip
  • Each of the second microstrip lines forms a three-joint coupling structure with a third microstrip line and a fourth microstrip line, and each sixth microstrip line and a seventh microstrip line form a double branch Match the load on the road.
  • the wideband bandpass filter loading the three-segment coupled microstrip line includes two double-branch matching ⁇ road loads and two three-branch coupling structures.
  • the two signal transmission ends are respectively used for signal input and signal output, 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 seventh microstrip line is a metal copper piece with a strip structure.
  • the length of the first microstrip line is 10 mm and the width is 1.66 mm
  • the lengths of the second microstrip line and the third microstrip line are both 14.5 mm and the width is 0.21 mm.
  • the length of the fourth microstrip line is 14.5 mm
  • the width is 0.12 mm
  • the shortest distance between the fourth microstrip line and the second microstrip line is 0.18 mm
  • the fourth microstrip line to the third microstrip The shortest distance between the lines is 0.18 mm
  • the length of the fifth microstrip line is 11.5 mm
  • the width is 2.88 mm
  • the width is 0.38 mm
  • the seventh microstrip The length of the wire is 10.8 mm and the width is 2.78 mm
  • the length of the signal transmission end is 10 mm and the width is 1.66 mm.
  • the impedance of each of the first microstrip lines is 50 ⁇
  • each of the two, three, and four microstrip lines together form a three-branch coupling structure
  • the odd-mode impedance of each three-joint coupling structure is 10 ⁇ .
  • the model impedance is 8 ⁇
  • the electrical length is 90 degrees
  • the impedance of each fifth microstrip line is 11 ⁇
  • the impedance of each sixth microstrip line is 10 ⁇
  • the impedance of each seventh microstrip line is 12 ⁇ .
  • 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 loading the three-segment coupled microstrip line of the present invention can be designed in the original two by designing two double-branched matching ⁇ -way loads and two three-branch coupling structures. Based on the filtering performance of the microstrip line, it achieves high selectivity to the passband signal, introduces less noise, and avoids interference to the RF front end.
  • FIG. 1 is a schematic structural view of a preferred embodiment of a broadband bandpass filter for loading a three-branch coupled microstrip line of the present invention.
  • FIG. 2 is a circuit schematic diagram of a preferred embodiment of a broadband bandpass filter for loading a three-segment coupled microstrip line of the present invention.
  • FIG. 3 is a schematic diagram of S-parameter results simulated by an electromagnetic simulation software of a broadband bandpass filter loaded with a three-branch coupled microstrip line according to the present invention.
  • FIG. 1 is a schematic structural view of a preferred embodiment of a broadband bandpass filter for loading a three-segment coupled microstrip line according to the present invention
  • FIG. 2 is a broadband diagram of the three-branch coupled microstrip line of the present invention. Circuit schematic of a preferred embodiment of a bandpass filter.
  • the broadband bandpass filter 1 loading the three-segment coupled microstrip line includes two first microstrip lines 101 and two second microstrip lines 102 disposed on the surface of the dielectric plate 100.
  • the wideband bandpass filter 1 loading the three-branch coupled microstrip line is bilaterally symmetric about a first central axis (ab line in FIG. 1) and is up and down with respect to a second central axis (the cd line in FIG. 1)
  • the first central axis is a line connecting the midpoints of the upper and lower lateral frames of the broadband bandpass filter 1 (ie, the line a-b in FIG. 1)
  • the second central axis is the A line connecting the midpoints of the left and right longitudinal frames of the broadband band pass filter 1 (i.e., line cd in Fig. 1), the first central axis and the second central axis are perpendicular to each other.
  • the strip line 105 and the two signal transmitting ends P1 are both parallel to the upper and lower horizontal borders
  • the two sixth microstrip lines 106 and the two seventh microstrip lines 107 are connected to the broadband band pass filter 1
  • the two vertical borders are parallel.
  • the first central axis and the second central axis of the broadband bandpass filter 1 loaded with the three-branch coupled microstrip line are not components formed of metal, but are produced or designed. At this time, it is convenient for the user to connect the components on the broadband band pass filter 1 (for example, two first microstrip lines 101, two second microstrip lines 102, two third microstrip lines 103, two roots)
  • the four microstrip lines 104, the two fifth microstrip lines 105, the two sixth microstrip lines 106, the two seventh microstrip lines 107, and the two signal transmission ends P1 are symmetric about the first central axis and are related to the first The two central axes are vertically symmetrical.
  • the central axis When the wideband bandpass filter 1 is operating, the central axis does not participate in any operation such as signal filtering.
  • the first central axis and the second central axis are for convenience of describing the left and right and upper and lower symmetrical structures of the broadband band pass filter 1.
  • each of the first microstrip lines 101 is connected to one signal output terminal P1, and the other end of each of the first microstrip lines 101 and one end of a second microstrip line 102 and a third micro One end of the strip line 103 is connected, wherein a gap is disposed between the second microstrip line 102 and the third microstrip line 103, and each of the fourth microstrip lines 104 is disposed on a second microstrip line 102 and a first In the gap formed between the three microstrip lines 103, one end of the fourth microstrip line 104 is connected to one end of a fifth microstrip line 105, and the other end of the fifth microstrip line 105 is connected to the other fifth.
  • the wideband bandpass filter 1 includes two double-branch-matching ramp loads 20 and two three-branch coupling structures 30.
  • the dielectric plate 100 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 first microstrip line 101, the second microstrip line 102, the third microstrip line 103, the fourth microstrip line 104, the fifth microstrip line 105, and the sixth microstrip line 106 , the seventh microstrip line 107 and the signal transmission end P1 are Metal copper sheet with strip structure.
  • the wideband bandpass filter for loading the three-segment coupled microstrip line of the present invention can change the length and width of the microstrip line to change the length of the microstrip line and the width of the microstrip line.
  • the wideband bandpass filter 1 achieves a good match in the operating band.
  • the operating band of the broadband bandpass filter 1 is in the range of 1.99 GHz to 4.72 GHz.
  • the first microstrip line 101 and the second layer disposed on the surface of the dielectric board 100 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 sheet of the length and width of the fourth microstrip line 104, the fifth microstrip line 105, the sixth microstrip line 106, the seventh microstrip line 107, and the signal transmission end P1 is limited, and does not affect the present invention.
  • two signal transmission terminals P1 are respectively used for signal input and signal output, wherein one signal transmission terminal P1 serves as a signal input terminal and the other signal transmission terminal P1 serves as a signal output terminal.
  • the signal input end may be the signal transmission end P1 on the left side in FIG. 1 or the signal transmission end P1 on the right side; the signal output end may be the signal transmission end P1 on the left side in FIG. 1 or the signal transmission on the right side. End Pl.
  • the signal transmission terminal P1 on the left side of FIG. 1 is used as the signal input terminal
  • the signal transmission terminal P1 on the right side of FIG. 1 serves as a signal output terminal, and the signal enters from the signal transmission terminal P1 on the left side, from the right.
  • the signal transmission terminal P1 on the right side of Fig. 1 serves as a signal input terminal, and the signal enters from the signal transmission terminal P1 on the right side and is output from the signal transmission terminal P1 on the left side.
  • the impedance of each of the first microstrip lines is 50 ⁇
  • each of the two, three, and four microstrip lines together form a three-joint coupling structure, and the odd model of each three-joint coupling structure
  • the impedance is 10 ⁇
  • the even mode impedance is 8 ⁇
  • the electrical length is 90 degrees
  • the impedance of each fifth microstrip line is 11 ⁇
  • the impedance of each sixth microstrip line is 10 ⁇
  • the impedance of each seventh microstrip line It is 12 ⁇ .
  • the wideband bandpass filter loaded with the three-branch coupled microstrip line of the present invention can be realized in a specific operating frequency band by designing two double-branch node matching circuit load 20 and two three-node coupling structures 30.
  • the original microstrip line has filtering performance, high selectivity to the passband signal, and less noise is introduced to avoid interference to the RF front end.
  • FIG. 3 is a schematic diagram of S-parameter results simulated by the electromagnetic simulation software of the broadband band-pass filter loaded with the three-branch coupled microstrip line of the present invention.
  • the wideband bandpass filter 1 loaded with the three-segment coupled microstrip line has a working frequency band of 1.9 9 GHz to 4.72 GHz (the frequency range corresponding to the IS11I curve ordinate -10 dB in FIG. 3), There is a relative bandwidth of 81.37 ⁇ 3 ⁇ 4 [(4. 72-1.99) / (0.5 * (4.72 + 1.99))], that is, the structure using the present invention has a wider relative bandwidth.
  • the reflection coefficient ie IS11 I in Figure 3
  • the frequency in the operating band is 6.5 GHz
  • the transmission coefficient ie IS21I in Figure 3
  • the passband signal of the wideband bandpass filter 1 has high selectivity. It can be seen that the wideband bandpass filter of the three-segment coupled microstrip line of the present invention has high selectivity to the passband signal and a wider relative bandwidth, introducing less noise and avoiding interference to the radio frequency front end.
  • the wideband bandpass filter loading the three-segment coupled microstrip line of the present invention includes two double-branch node matching loop loads 20 and two three-branch coupling structures 30, so that the original microstrip line has the basis of filtering performance. It has a high band pass selectivity.
  • the wideband bandpass filter loaded with the three-segment coupled microstrip line of the present invention can be designed in the original microstrip line by designing two double-branched matching ⁇ -way loads and two three-branch coupling structures. Based on the filtering performance, it achieves high selectivity to the passband signal, introduces less noise, and avoids 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

L'invention concerne un filtre passe-bande à bande large chargé avec une ligne microruban couplée à trois branches. Le filtre comprend deux premières lignes microrubans, deux deuxièmes lignes microrubans, deux troisièmes lignes microrubans, deux quatrièmes lignes microrubans, deux cinquièmes lignes microrubans, deux sixièmes lignes microrubans, deux septièmes lignes microrubans et deux extrémités de transmission de signal qui sont toutes disposées sur une surface d'une plaque diélectrique. Le filtre passe-bande à bande large est bilatéralement symétrique autour d'un premier axe central, et le filtre passe-bande à bande large est longitudinalement symétrique autour d'un deuxième axe central, le premier axe central étant une ligne de liaison entre les points centraux de cadres transversaux supérieur et inférieur du filtre passe-bande à bande large, et le deuxième axe central étant une ligne de liaison entre les points centraux de cadres longitudinaux gauche et droit du filtre passe-bande à bande large. Le filtre passe-bande à bande large de la présente invention peut réaliser une sélectivité élevée pour un signal dans la bande passante, ce qui permet d'introduire moins de bruit et d'éviter un brouillage au niveau d'un frontal radiofréquence.
PCT/CN2017/114057 2017-06-23 2017-11-30 Filtre passe-bande à bande large chargé avec une ligne microruban couplée à trois branches WO2018233227A1 (fr)

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Application Number Priority Date Filing Date Title
CN201710489011.4A CN107394321A (zh) 2017-06-23 2017-06-23 加载三枝节耦合微带线的宽带带通滤波器
CN201710489011.4 2017-06-23

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107394321A (zh) * 2017-06-23 2017-11-24 深圳市景程信息科技有限公司 加载三枝节耦合微带线的宽带带通滤波器
CN207038672U (zh) * 2017-06-23 2018-02-23 深圳市景程信息科技有限公司 具有扩大相对带宽的宽带带通滤波器
CN109768384B (zh) * 2019-01-23 2020-10-16 西安电子科技大学 基于奇模人工表面等离激元宽带端射天线、无线通信系统
CN111490321A (zh) * 2020-03-05 2020-08-04 东北大学秦皇岛分校 基于改进型十字形结构的宽带滤波器及设计方法
CN111463527A (zh) * 2020-03-05 2020-07-28 东北大学秦皇岛分校 基于不等长十字形谐振器的双频带带通滤波器及设计方法

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CN107394321A (zh) * 2017-06-23 2017-11-24 深圳市景程信息科技有限公司 加载三枝节耦合微带线的宽带带通滤波器

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CN101694899A (zh) * 2009-10-16 2010-04-14 电子科技大学 一种具有扇形开路结构的微带带通滤波器
CN101950827A (zh) * 2010-09-06 2011-01-19 华东交通大学 一种枝节加载式超宽带微波滤波器
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