WO2021035805A1 - Filtre et sa structure de boucle de filtre - Google Patents

Filtre et sa structure de boucle de filtre Download PDF

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Publication number
WO2021035805A1
WO2021035805A1 PCT/CN2019/105226 CN2019105226W WO2021035805A1 WO 2021035805 A1 WO2021035805 A1 WO 2021035805A1 CN 2019105226 W CN2019105226 W CN 2019105226W WO 2021035805 A1 WO2021035805 A1 WO 2021035805A1
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WO
WIPO (PCT)
Prior art keywords
resonator
coupling
filter
loop
resonators
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PCT/CN2019/105226
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English (en)
Chinese (zh)
Inventor
谢懿非
丁海
林显添
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京信通信技术(广州)有限公司
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Publication of WO2021035805A1 publication Critical patent/WO2021035805A1/fr

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    • 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
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure

Definitions

  • the present invention relates to the field of communication technology, in particular to a filter and its filter loop structure.
  • the filter As a frequency selection device, the filter is a very critical component in communication equipment. With the rapid development of communication technology, whether the device can achieve low insertion loss has become the key to restricting its development. The usual practice is to increase the number of zeros to widen the passband and improve the suppression, so as to achieve the purpose of reducing the insertion loss. When increasing the zero point of the traditional filter, the cavity structure of the filter generally needs to be redesigned. Therefore, although multiple zeros can be realized, the structure is complicated.
  • a filter loop structure including six resonators, the six resonators are arranged in sequence along a signal transmission path to form a main loop, a coupling adjustment structure is arranged between the first resonator and the tail resonator, and the main loop is not phased
  • Two adjacent resonators are connected to form a coupling branch, and cooperate with the main loop to form two coupling loops, and each of the coupling loops includes a capacitive coupling structure
  • six of the resonators are distributed on a first side and a second side opposite to the first side, and the first resonator and the tail resonator are located on the same side.
  • the six resonators are respectively a first resonator, a second resonator, a third resonator, a fourth resonator, a fifth resonator, and a sixth resonator arranged in sequence.
  • the first resonator and the sixth resonator respectively constitute the first resonator and the tail resonator, and three of the resonators are distributed on the first side and the second side respectively.
  • the resonator located in the middle position of the first side is connected to the resonator located in the middle position of the second side to form the coupling branch.
  • the second resonator, the third resonator, and the fourth resonator are sequentially distributed on the first side, and the first resonator, the sixth resonator, and the The fifth resonator is sequentially distributed on the second side, and the third resonator and the sixth resonator are connected to form the coupling branch.
  • it includes two stacked dielectric blocks, the second resonator, the third resonator, and the fourth resonator are formed in one of the dielectric blocks, and the first resonator The device, the six resonator, and the fifth resonator are formed in another dielectric block.
  • the capacitive coupling structure is arranged between the two resonators to form the coupling branch, and the two coupling loops share the capacitive coupling structure.
  • an inductive coupling structure is provided between the two resonators to form the coupling branch, and the capacitive coupling structure in each coupling loop is arranged in addition to the coupling branch. Between two adjacent resonators.
  • the coupling adjustment structure is a cross-coupling mechanism, which can switch between capacitive coupling and inductive coupling between the first resonator and the tail resonator.
  • the coupling adjustment structure includes an adjustment slot provided between the first resonator and the tail resonator, and an end of the adjustment slot and the sidewall of the resonator Adjustable spacing.
  • a filter includes the filter loop structure as described in any one of the above preferred embodiments.
  • the above-mentioned filter and its filtering loop structure can form two coupling loops in the main loop by setting the coupling branch. Moreover, since each coupling loop includes a capacitive coupling structure, a phase difference is generated in each coupling loop, so that a pair of zeros can be generated in each coupling loop. Therefore, compared with the traditional filter, the above-mentioned filter adds a pair of zero points, which is a 6-cavity 4-zero point structure. Moreover, the cavity structure of the filter loop does not need to be changed, only the coupling branch is added and the capacitive coupling structure is set at a suitable position.
  • the above-mentioned filter and its filter loop structure have a simpler structure while realizing multiple zeros.
  • Fig. 1 is a schematic structural diagram of a filter loop structure in an embodiment of the present invention
  • FIG. 1 is an equivalent circuit diagram of the filter loop structure shown in Figure 1;
  • Figure 3 is an equivalent circuit diagram of a filter loop structure in other embodiments of the present invention.
  • Figure 4 is an equivalent circuit diagram of a filter loop structure in other embodiments of the present invention.
  • Figure 5 is an equivalent circuit diagram of a filter loop structure in other embodiments of the present invention.
  • Fig. 6 is an equivalent circuit diagram of a filter loop structure in other embodiments of the present invention.
  • Fig. 7 is an equivalent circuit diagram of a filter loop structure in other embodiments of the present invention.
  • Fig. 8 is an equivalent circuit diagram of a filter loop structure in other embodiments of the present invention.
  • Fig. 9 is a schematic structural diagram of a filter loop structure in another embodiment of the present invention.
  • the present invention provides a filter and filter loop structure 100.
  • the filter includes a filter loop structure 100.
  • the above-mentioned filter may be a dielectric filter or a metal cavity filter.
  • the filter loop structure 100 in an embodiment of the present invention includes six resonators 110, a coupling adjustment structure 120 and a capacitive coupling structure 130.
  • the six resonators 110 are arranged in sequence along the signal transmission path to form a main loop, and a coupling adjustment structure 120 is arranged between the first resonator and the last resonator.
  • a coupling adjustment structure 120 is arranged between the first resonator and the last resonator.
  • the six resonators 110 are respectively a first resonator 110a, a second resonator 110b, a third resonator 110c, a fourth resonator 110d, a fifth resonator 110e, and a sixth resonator 110f arranged in sequence.
  • the signal may be sequentially transmitted along the first resonator 110a, the second resonator 110b, the third resonator 110c, the fourth resonator 110d, the fifth resonator 110e, and the sixth resonator 110f. It needs to be pointed out that similar terms such as "first" and "second” in the text do not represent specific quantities and sequences, but are merely convenient for distinction.
  • Two non-adjacent resonators 100 in the main loop are connected to form a coupling branch 11 and cooperate with the main loop to form two coupling loops, and each coupling loop includes a capacitive coupling structure 130.
  • the capacitive coupling structure 130 can be realized and adjusted by providing coupling slots and coupling holes, and can be any existing structure capable of adjusting the amount of capacitive coupling.
  • the two resonators 100 forming the coupling branch 11 may be capacitively connected or inductively connected.
  • each coupling loop includes a capacitive coupling structure 130, so a phase difference is generated in each coupling loop, so that a pair of zeros can be generated in each coupling loop.
  • the above filter loop result 100 has two pairs of zeros.
  • the above-mentioned filter adds a pair of zero points, which is a 6-cavity 4-zero point structure. Therefore, it can effectively reduce the insertion loss and improve the out-of-band suppression.
  • the row cavity structure of the six resonators 110 can be the same as the existing filter circuit.
  • six resonators are distributed on the first side and the second side opposite to the first side, and the first resonator and the tail resonator are located on the same side. That is, the first resonator and the tail resonator are located on the first side or the second side at the same time.
  • this setting is convenient for simulation; on the other hand, it can be connected to the signal input port (first resonator) and signal output port (tail resonator) of the main circuit at the same time by opening the corresponding connection port on a circuit board and other connecting components. ) To connect, so it is convenient to lay out the input and output ports, and is helpful to save the layout space of the filter.
  • the cavity structure of the filter loop does not need to be changed, only the coupling branch is added and the capacitive coupling structure 130 is set at a suitable position. Therefore, the above-mentioned filter and its filter loop structure 100 have a simpler structure while realizing multiple zeros.
  • three resonators 110 are respectively distributed on the first side and the second side.
  • the six resonators 110 are respectively distributed on two sides, as long as the first resonator 110a and the sixth resonator 110f are on the same side. for example:
  • the first side is distributed with the first resonator 110a, the sixth resonator 110f, and the fifth resonator 110e;
  • the second side is distributed with the second resonator 110b, the third resonator 110c, and the fourth resonator 110d.
  • the second resonator 110b, the first resonator 110a, and the sixth resonator 110f may also be distributed on the first side; and the third resonator 110c, the fourth resonator 110d, and the fifth resonator may be distributed on the second side. ⁇ 110e.
  • the position of the first side and the second side can also be reversed.
  • the symmetry of the filter loop structure 100 is better, which not only facilitates the layout of the filter, but also improves the filtering performance.
  • the filter loop structure 100 includes two stacked dielectric blocks.
  • the second resonator 110b, the third resonator 110c, and the fourth resonator 110d are formed in one of the dielectric blocks.
  • the resonator 110f and the fifth resonator 110e are formed in another dielectric block.
  • three resonators 110 can be formed on the dielectric block first, and then the two dielectric blocks can be superimposed according to the preset, so the assembly is more convenient.
  • the resonator 110 located in the middle position of the first side is connected to the resonator 110 located in the middle position of the second side to form a coupling branch.
  • the two resonators 110 at the middle position of the first side and the second side are arranged oppositely, there is no need to set up flying leads when realizing the connection, and the coupling of the two resonators 110 can be realized directly by opening a window, setting a metal rod, etc., and The formation of coupling branches is conducive to simplifying the structure.
  • the two coupling loops formed each include four resonators 110, which have a high degree of symmetry, which is beneficial to further improve the filtering performance.
  • a first resonator 110a, a sixth resonator 110f, and a fifth resonator 110e are distributed on the first side
  • a second resonator 110b, a third resonator 110b and the third resonator are distributed on the second side.
  • 110c and the fourth resonator 110d are connected to form a coupling branch.
  • the first coupling loop 12 includes a first resonator 110a, a second resonator 110b, a third resonator 110c, and a sixth resonator 110f;
  • the second coupling loop 13 includes a third resonator 110c, a fourth resonator 110d, The fifth resonator 110e and the sixth resonator 110f.
  • the second resonator 110b, the first resonator 110a, and the sixth resonator 110f are distributed on the first side
  • the third resonator 110c, the fourth resonator 110c and the fourth resonator are distributed on the second side.
  • 110d and the fifth resonator 110e are connected to form a coupling branch.
  • the first coupling loop 12 includes a first resonator 110a, a second resonator 110b, a third resonator 110c, and a fourth resonator 110d;
  • the second coupling loop 13 includes a fourth resonator 110d, a fifth resonator 110e, The sixth resonator 110f and the first resonator 110a.
  • the capacitive coupling structure 130 can be shared between the two coupling loops, or the capacitive coupling structure 130 can be provided separately. As shown in FIGS. 1 and 2, in one embodiment, a capacitive coupling structure 130 is provided between two resonators 110 to form a coupling branch, and the two coupling loops share the capacitive coupling structure 130.
  • the two resonators 110 constituting the coupling branch are capacitively coupled, and the first resonator and the tail resonator are inductively coupled. Since the two coupling loops can share the capacitive coupling structure 130. Therefore, only one capacitive coupling structure 130 needs to be provided in the filter loop structure 100, which is beneficial to simplify the structure.
  • each coupling loop can also be individually provided with a capacitive coupling structure.
  • an inductive coupling structure is provided between the two resonators 110 to form a coupling branch, and the capacitive coupling structure 130 in each coupling loop is set in the decoupling branch. Between two adjacent resonators 110 outside the road.
  • the coupling adjustment structure 120 is a cross-coupling mechanism, which can switch between capacitive coupling and inductive coupling between the head resonator and the tail resonator.
  • the cross-coupling structure when the cross-coupling structure is capacitive coupling, the cross-coupling structure can be used as the capacitive coupling structure 130 in the coupling loop.
  • the coupling adjustment structure 120 is used as the capacitive coupling structure 130.
  • the coupling loop can be adjusted only by adjusting the capacitive coupling of the cross-coupling structure.
  • the coupling loop is then used. In terms of other adjustment methods of the capacitive coupling structure 130, the adjustment of the coupling loop is simpler and more convenient.
  • the coupling adjustment structure 120 includes an adjustment slot 121 disposed between the first resonator and the tail resonator, and the distance between one end of the adjustment slot 121 and the sidewall of the resonator 110 is adjustable. Therefore, by flexibly adjusting the distance between one end of the adjusting slot 121 and the side wall of the resonator 110, that is, "L" shown in FIG. 1, the coupling amount between the two resonators at the head and the tail can be adjusted.
  • the above-mentioned filter and its filter loop structure 100 can form two coupling loops in the main loop by arranging coupling branches. Moreover, since each coupling loop includes the capacitive coupling structure 130, a phase difference is generated in each coupling loop, so that a pair of zeros can be generated in each coupling loop. Therefore, compared with the traditional filter, the above-mentioned filter adds a pair of zero points, which is a 6-cavity 4-zero point structure. Moreover, the cavity discharge structure of the filter loop 100 does not need to be changed, only the coupling branch is added and the capacitive coupling structure 130 is set at a suitable position.
  • the above-mentioned filter and its filter loop structure have a simpler structure while realizing multiple zeros.

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Abstract

La présente invention concerne un filtre et sa structure de boucle de filtre. Au moyen de la disposition d'une branche de couplage, deux boucles de couplage peuvent être formées dans une boucle principale. De plus, étant donné que chaque boucle de couplage comprend une structure de couplage capacitif, une différence de phase est générée dans chaque boucle de couplage, de telle sorte qu'une paire de zéros peut être générée dans chaque boucle de couplage. Par conséquent, par comparaison avec des filtres classiques, le filtre a une paire de nouveaux zéros, et est d'une structure à six cavités à quatre zéros. De plus, il n'est pas nécessaire de modifier une structure de cavités agencée d'une boucle de filtre, et il suffit d'ajouter une branche de couplage, et la structure de couplage capacitif doit seulement être disposée à une position appropriée. En outre, un premier résonateur et un résonateur de queue dans une boucle principale sont disposés du même côté, ce qui facilite l'agencement des ports d'entrée et de sortie et est avantageux pour économiser l'espace de disposition du filtre. Par conséquent, le filtre et sa structure de boucle de filtre présentent une structure plus simple tout en offrant de multiples zéros.
PCT/CN2019/105226 2019-08-27 2019-09-10 Filtre et sa structure de boucle de filtre WO2021035805A1 (fr)

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CN201910796031.5A CN110429364B (zh) 2019-08-27 2019-08-27 滤波器及其滤波回路结构
CN201910796031.5 2019-08-27

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110429364B (zh) * 2019-08-27 2024-05-24 京信通信技术(广州)有限公司 滤波器及其滤波回路结构
CN111668580A (zh) * 2020-06-09 2020-09-15 江苏贝孚德通讯科技股份有限公司 具有陡峭带外抑制的介质滤波器及天线

Citations (7)

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Publication number Priority date Publication date Assignee Title
JP2000077909A (ja) * 1998-09-03 2000-03-14 Nippon Dengyo Kosaku Co Ltd 矩形導波管共振器型帯域通過フィルタ
WO2001069712A1 (fr) * 2000-03-16 2001-09-20 Cryosystems Ltd. Filtre de radiofrequences
GB2452934A (en) * 2007-09-19 2009-03-25 Isotek Electronics Ltd A tuneable bandpass filter using coupled resonators
CN206461069U (zh) * 2017-02-13 2017-09-01 石家庄创天电子科技有限公司 一种多传输零点滤波器
CN208062223U (zh) * 2018-04-08 2018-11-06 宁波华瓷通信技术有限公司 一种滤波器传输零点实现结构
CN110429364A (zh) * 2019-08-27 2019-11-08 京信通信技术(广州)有限公司 滤波器及其滤波回路结构
CN210142707U (zh) * 2019-08-27 2020-03-13 京信通信技术(广州)有限公司 滤波器及其滤波回路结构

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2421085A1 (fr) * 2010-08-19 2012-02-22 Alcatel Lucent Filtre pour signaux de fréquence radio
CN112886161B (zh) * 2015-11-27 2022-03-29 华为技术有限公司 介质滤波器，收发信机及基站

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000077909A (ja) * 1998-09-03 2000-03-14 Nippon Dengyo Kosaku Co Ltd 矩形導波管共振器型帯域通過フィルタ
WO2001069712A1 (fr) * 2000-03-16 2001-09-20 Cryosystems Ltd. Filtre de radiofrequences
GB2452934A (en) * 2007-09-19 2009-03-25 Isotek Electronics Ltd A tuneable bandpass filter using coupled resonators
CN206461069U (zh) * 2017-02-13 2017-09-01 石家庄创天电子科技有限公司 一种多传输零点滤波器
CN208062223U (zh) * 2018-04-08 2018-11-06 宁波华瓷通信技术有限公司 一种滤波器传输零点实现结构
CN110429364A (zh) * 2019-08-27 2019-11-08 京信通信技术(广州)有限公司 滤波器及其滤波回路结构
CN210142707U (zh) * 2019-08-27 2020-03-13 京信通信技术(广州)有限公司 滤波器及其滤波回路结构

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