EP3823090A1 - Kapazitive kreuzkopplungsstruktur und hohlraumfilter - Google Patents

Kapazitive kreuzkopplungsstruktur und hohlraumfilter Download PDF

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Publication number
EP3823090A1
EP3823090A1 EP19835085.2A EP19835085A EP3823090A1 EP 3823090 A1 EP3823090 A1 EP 3823090A1 EP 19835085 A EP19835085 A EP 19835085A EP 3823090 A1 EP3823090 A1 EP 3823090A1
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EP
European Patent Office
Prior art keywords
coupling
resonator
support base
insulating support
coupling part
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP19835085.2A
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English (en)
French (fr)
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EP3823090A4 (de
EP3823090B1 (de
Inventor
Bihui MENG
Jun Qi
Jinchao XIA
Jingqiang WU
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Comba Telecom Technology Guangzhou Ltd
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Comba Telecom Technology Guangzhou Ltd
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Publication of EP3823090A1 publication Critical patent/EP3823090A1/de
Publication of EP3823090A4 publication Critical patent/EP3823090A4/de
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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
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • 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
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other
    • 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
    • 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
    • H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators

Definitions

  • the present invention relates to the field of communication technology, in particular, to a capacitive cross-coupling structure and a cavity filter.
  • the suppression of the filter is improved by adding a coupling structure in the cavity filter.
  • most of the coupling structure of the cavity filter is a "U" shaped structure or a “flying bar with disks at both ends” .
  • the "U"-shaped structure is not suitable for the cavity of a resonator with a flange.
  • FIG. 1 is a prior art cavity filter.
  • a cavity filter with a resonant cavity is taken as an example.
  • a resonator is set inside each resonant cavity.
  • a coupling structure 300 is a structure of "a flying bar 400 with coupling discs 500 at both ends".
  • the coupling structure 300 is installed in the cavity filter.
  • the coupling discs 500 need to be very close to the resonator 200, which causes assembly difficulties.
  • the coupling amount must be adjusted by adjusting the distance between the resonator 200 and the coupling disc 500. As the coupling disc 500 is very close to the resonator 200, the adjusting distance is limited, so that the adjustable range of the coupling amount between the coupling structure 300 and the resonator 200 is limited, and thus cannot be adapted to many application scenarios.
  • the embodiments of the present invention provide a capacitive cross-coupling structure and a cavity filter, which can enhance the coupling amount and increase the adjustable range of the capacitive coupling.
  • the embodiment of the present invention provides a capacitive cross-coupling structure for coupling the energy of the first resonator and the second resonator.
  • the capacitive cross-coupling structure includes:
  • one end of the first coupling part far away from the insulating support base is grounded, and one end of the second coupling part far away from the insulating support base is suspended and spaced apart from the second resonator at an interval.
  • the first coupling part is grounded, and the distance between the end of the second coupling part far away from the insulating support base and the second resonator is maintained, so as to realize adj ustment of the distance between an end of the second coupling part away from the insulating support base and the second resonator, according to the required coupling amount.
  • the first coupling part is grounded, even if the distance between the second coupling part and the second resonator is relatively short, the coupling amount between the coupling fly bar and the resonator can be made larger.
  • the coupling structure is adjusted by adjusting the distance between the second coupling part and the second resonator, so that the resulting coupling range between the flying bar and the resonator is larger, which can be applied to a variety of different application scenarios.
  • the coupling fly bar is detachably disposed on the insulating support base.
  • the coupling flying bar is detachably disposed on the insulating support base, then the coupling flying bar can be used in different coupling structures to obtain a variety of coupling structures and have a wider application range.
  • the interval between the end of the second coupling part far away from the insulating support base and the second resonator is greater than 1mm.
  • the interval between the end of the second coupling part far away from the insulating support base and the second resonator is greater than 1mm. This can ensure that the distance between the end of the second coupling part far away from the insulating support base and the second resonator is not too small to adjust the coupling amount. Therefore, when the coupling structures are mass-produced, the coupling consistency of the mass-produced coupling structures can be ensured as much as possible.
  • the end of the first coupling part far away from the insulating support base is connected to the first resonator for being grounded; or, the end of the first coupling part far away from the insulating support base is connected to a bottom of a cavity defined between the first resonator and the insulating support base for being grounded; or, the end of the first coupling part far away from the insulating support base is connected to a cover plate on the first resonator for being grounded.
  • the first coupling part can be grounded in any one of the above three ways, which is relatively flexible.
  • a coupling disc is provided at the end of the second coupling part far away from the insulating support base.
  • the distance between the coupling disc and the second resonator can be adjusted, or the diameter of the coupling disc can be adjusted.
  • the coupling amount between the first coupling part and the first resonator and the coupling amount between the second coupling part and the second resonator are greater than the preset coupling amount, thereby realizing adjustment of the coupling amount in different ways.
  • it also includes a support disposed between the insulating support base and the first resonator, and the end of the first coupling part far away from the insulating support base is disposed on the insulating support base for being grounded.
  • the first coupling part can be grounded with the first resonator through an intermediate piece, that is, a support piece, in a flexible manner.
  • the supporting piece and the first resonator are of an integral structure; or, the supporting piece and the first resonator are of a separated structure.
  • the supporting piece and the first resonator may be of an integrated structure, which reduces the difficulty of adjustment, ensures the consistency of the production and assembly process, and improves the production efficiency.
  • the end of the first coupling part far away from the insulating support base is fixed on the support through a threaded connective member.
  • the coupling fly bar is plated with a metal material.
  • the coupling fly rod may be plated with a metal material to ensure that it has good conductivity as much as possible.
  • an embodiment of the present invention provides a cavity filter, including a cavity in which the capacitive cross-coupling structure as described in the first aspect is provided.
  • it further includes a third resonator and a fourth resonator, wherein a center line between the third resonator and the fourth resonator is perpendicular to a center line between the first resonator and the second resonator.
  • the coupling structure can also be applied to a filter with four resonant cavities to realize dual transmission zeros at the low end of the passband.
  • the coupling structure in the embodiment of the present invention can achieve a larger adjustment range of the coupling amount of the cavity filter, and can meet the existing cavity filter suppression requirements.
  • the first coupling part is grounded, and the distance between the end of the second coupling part far away from the insulating support base and the second resonator is maintained, to adjust the distance between the end of the second coupling part away from the insulating support base and the second resonator according to required coupling amount the requirement. Since the first coupling part is grounded, even if the distance between the second coupling part and the second resonator is relatively short, the coupling amount between the coupling fly bar and the resonator can be made larger.
  • the coupling structure is adjusted by adjusting the distance between the second coupling part and the second resonator, and the obtained coupling amount between the flying bar and the resonator has a larger range, and accordingly it can be applied to a variety of different application scenarios.
  • a coupling structure 300 of a cavity filter as shown in FIG. 1 is "a flying bar 400 with coupling discs 500 at both ends”. It adjusts the coupling amount by adjusting the distance between the resonator 200 and the coupling disc 500. Since the coupling disc 500 is very close to the resonator 200 and the adjustment distance is limited, the adjustable range of the coupling amount between the coupling structure 300 and the resonator 200 is limited, and it cannot be adapted to many application scenarios.
  • the embodiments of the present invention provide a capacitive cross-coupling structure and a cavity filter.
  • the first coupling part is grounded, and one end of the second coupling part away from the insulating support base is separated from the second resonator. This realizes that the distance between the end of the second coupling part away from the insulating support base and the second resonator can be adjusted according to the required coupling amount.
  • the coupling structure is adjusted by adjusting the distance between the second coupling part and the second resonator, and the obtained coupling amount between the flying bar and the resonator has a larger range, that is, the range of the coupling amount of the cavity filter is larger, so that it can be applied to a variety of different application scenarios.
  • an embodiment of the present invention provides a capacitive cross-coupling structure, which is used to couple the energy.
  • the first resonator 101 is in a first resonant cavity 10
  • the second resonator 201 is in a second resonant cavity 20.
  • the capacitive cross-coupling structure includes an insulating support base 30 and a coupling flying bar.
  • the insulating support base 30 is arranged between the first resonator 101 and the second resonator 201.
  • the coupling flying bar is arranged on the insulating support base 30, and it includes a first coupling part 301 arranged between the first resonator 201 and the insulating support base 30, and a first coupling part 301 arranged between the second resonator 201 and the insulating support base 30
  • the first resonator 101 is provided with a first metal tuning screw 102
  • the second resonator 201 is provided with a second metal tuning screw 202.
  • the first coupling part 301 is used for coupling with the first resonator 101
  • the second coupling part 302 is used for coupling with the second resonator 201.
  • the first coupling part 301 and the second coupling part 302 are not limited, as long as any one of the coupling parts in the coupling structure is grounded, and the distance between the other coupling part and the closer resonator is within a certain range.
  • the first coupling part 301 is grounded for description.
  • the capacitive cross-coupling structure can be applied to a cavity filter.
  • the first coupling part 301 is connected to the ground in the cavity filter, the end of the first coupling part 301 away from the insulating support base 30 is grounded.
  • a distance is maintained between the end of the second coupling part 302 away from the insulating support base 30 and the second resonator 201. It can also be understood that the distance between the end of the second coupling part 302 away from the insulating support base 30 and the second resonator 201 can be adjusted within a certain range to achieve at least two different coupling amounts .
  • the initial distance between the end of the second coupling part 302 away from the insulating support base 30 and the second resonator 201 is greater than 1 mm.
  • the initial distance between the end of the second coupling part 302 away from the insulating support base 30 and the second resonator 201 may be smaller.
  • the distance between the end of the second coupling part 302 away from the insulating support base 30 and the second resonator 201 is small, it is difficult to adjust other resonators by adjusting one or some resonators of the cavity filter, and so, adjustment is more difficult.
  • the initial distance between the end of the second coupling part 302 away from the insulating support base 30 and the second resonator 201 is greater than 1 mm, so as to ensure that distance of the end of the second coupling part away from the insulating support base and the second resonator is not too small, otherwise it is difficult to adjust the coupling amount. In this way, it can be ensured that when the coupling structures are mass-produced, the coupling consistency of the mass-produced coupling structures is better.
  • FIG. 1 A prior art cavity filter is shown in Fig. 1 .
  • the distance between the coupling disc 500 and the resonator 200 needs to be very close, which leads to limited adjustment distance.
  • the adjustable range of the coupling amount between the coupling structure 300 and the resonator 200 is limited, and the obtained coupling amount range is also limited.
  • the first coupling part 301 is grounded, if the coupling amount is to be the same as that in FIG. 1 , then, relative to FIG.
  • the distance between the end of the second coupling part 302 far away from the insulating support base and the second resonator 201 will increase, which makes it easier to assemble and improves assembly efficiency.
  • the distance between the end of the second coupling part 302 away from the insulating support base 30 and the second resonator 201 is the same as that between the coupling disc 500 and the resonator 200 shown in FIG. 1 , then compared with the coupling amount between the coupling disc 500 and the resonator 200 shown in FIG.
  • the coupling amount between the second coupling part 302 and the second resonator 201 is larger, so that the coupling structure provided by the embodiment of the invention can further expand the range of the coupling amount and apply to more different application scenarios.
  • the second coupling part 302 may be provided with a coupling disc 303, and the diameter of the coupling disc 303 may be within a certain range.
  • the distance between the coupling disc 303 and the second resonator 201 can be adjusted, or the diameter of the coupling disc 303 can be adjusted to make the coupling amount between the first coupling part 301 and the first resonator 101 and the coupling amount between the second coupling part 302 and the second resonator 201, are greater than the preset coupling amount, so as to adjust the coupling amount in various ways.
  • the first coupling part 301 may be grounded in various ways .
  • an end of the first coupling part 301 away from the insulating support base 30 may be connected to the first resonator 101 to be grounded.
  • the end of the first coupling part 301 away from the insulating support base 30 may be connected to a bottom of the cavity between the first resonator 201 and the insulating support base 30 to be grounded.
  • the first coupling part 301 may be connected to a cover plate of the first resonator 201 to be grounded. Since the cover plate and the first coupling part 301 have a certain height difference, when the first coupling part 301 is connected to the cover plate, there is also a problem of difficulty in assembly.
  • a support piece 103 may be further provided inside the first resonant cavity 10, and the support piece 103 and the first resonator 101 are commonly grounded. In this way, by connecting the first coupling part 301 to the support piece 103, grounding can be achieved.
  • the support piece 103 can be fixed on the first resonator 101. If the support piece 103 and the first resonator 101 are of separate structure, the support piece 103 can be adhered to the first resonator 101 by possible fixing methods, for example, glue. Or, in order to be more stable, the support piece 103 and the first resonator 101 may be of an integral structure.
  • the integrated design reduces the difficulty of adjustment and solves the industry' s shortcomings, that is, during the adjustment process, due to assembly errors, the first resonator 101 is pulled to adjust the coupling amount. This ensures the consistency of the production assembly process, improves production efficiency, and is suitable for mass production.
  • the support piece 103 may be a columnar body adapted to the shape of an outer wall of the first resonator 101, or the support piece 103 may be of a convex structure or other possible support structures.
  • the first coupling part 301 may be fixed on the support piece 103 by a threaded connective member 104. If the threaded connective member 104 is made of metal material, the threaded connective member 104 needs to be plated with a certain thickness of metal material to ensure good conductivity.
  • the inside of the first resonant cavity 10, the second resonant cavity 20, the coupling fly rod, etc. may be plated with a certain thickness of metal material, such as gold, silver or copper, to maintain good conductivity as much as possible.
  • the capacitive cross-coupling structure provided by the embodiment of the present invention can be applied to a cavity filter with four resonant cavities.
  • a third resonant cavity 40 includes a third resonator 401
  • a fourth resonant cavity 50 includes a fourth resonator 501.
  • a center line of the third resonant cavity 40 and the fourth resonant cavity 50 and is perpendicular to that of the first resonant cavity 10 and the second cavity 20.
  • the coupling structure can be placed in the middle of the four resonators to achieve dual transmission zeros at the low end of the passband.
  • the coupling structure in the embodiment of the present invention can achieve a larger adjustment range of the coupling amount of the cavity filter, and can meet the suppression requirements that the prior art cavity filter is difficult to achieve.
  • the following experimental data illustrates that the coupling structure provided by the embodiment of the present invention makes the adjustment range of the coupling amount of the cavity filter larger.
  • the cavity filter provided by the embodiment of the present invention is simulated while keeping the cavity size of the cavity filter and the frequency point of the communication center the same.
  • the simulation result is shown in Fig. 5 .
  • a prior art cavity filter is simulated, and the simulation results are shown in Fig. 7 .
  • the distance between the end of the second coupling part 302 away from the insulating support base 30 and the second resonator 201 is adjusted to obtain the coupling amount of the cavity filter provided by the embodiment of the present invention and that of the prior art cavity filter, as shown in Table 1.
  • Table 1 Data table of the prior art coupling amount and the coupling amount of the embodiment of the present invention Dista nce (mm) Realized frequency band (MHz) Center frequen cy (MHz ) Prior art coupling amount Coupling amount of the embodiment of the present invention Increase ratio of coupling amount 3 790-862 776 0.00773 0.02835 266.8% 2 790-862 776 0.01030 0.03727 261.8% 1.5 790-862 776 0.01418 0.04382 209.0% 1 790-862 776 0.01933 0.05799 200.0%
  • the coupling amount of the embodiment of the present invention is at least 2 times greater than the conventional coupling amount.
  • the coupling amount in the embodiment of the present invention is 0.05799, while the prior art coupling amount is 0.01933. That is, the coupling amount of the embodiment of the present invention is three times the prior art coupling amount.
  • the first coupling part is grounded, and the end of the second coupling part away from the insulating support base is spaced from the second resonator to realize: adjustment of the distance between the end of the second coupling part away from the insulating support and the second resonator. Since the first coupling part is grounded, even if the distance between the second coupling part and the second resonator is relatively short, the coupling amount between the coupling fly rod and the resonator can be made larger.
  • the coupling structure is adjusted by adjusting the distance between the second coupling part and the second resonator, and the obtained coupling amount between the flying bar and the resonator has a larger variation range , so as to meet the requirements of the coaxial cavity for the coupling amount, achieve different frequency bands and performance and quality assurance requirements, it can be applied to a variety of different application scenarios, and reduces costs.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP19835085.2A 2018-07-13 2019-06-11 Kapazitive kreuzkopplungsstruktur und hohlraumfilter Active EP3823090B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201810768244.2A CN108649303A (zh) 2018-07-13 2018-07-13 一种容性交叉耦合结构及腔体滤波器
PCT/CN2019/090793 WO2020010984A1 (zh) 2018-07-13 2019-06-11 一种容性交叉耦合结构及腔体滤波器

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EP3823090A1 true EP3823090A1 (de) 2021-05-19
EP3823090A4 EP3823090A4 (de) 2022-04-20
EP3823090B1 EP3823090B1 (de) 2024-08-21

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EP (1) EP3823090B1 (de)
CN (1) CN108649303A (de)
BR (1) BR112021000431A2 (de)
WO (1) WO2020010984A1 (de)

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CN108649303A (zh) * 2018-07-13 2018-10-12 京信通信系统（中国）有限公司 一种容性交叉耦合结构及腔体滤波器
CN115298899B (zh) * 2020-02-20 2024-04-02 株式会社Kmw 空腔滤波器及其制造方法
CN111463532A (zh) * 2020-05-21 2020-07-28 江苏贝孚德通讯科技股份有限公司 交叉耦合组件及具有交叉耦合组件的滤波器
CN113851803A (zh) * 2020-06-28 2021-12-28 大富科技(安徽)股份有限公司 一种滤波器及通信设备
CN113964463A (zh) * 2020-07-21 2022-01-21 大富科技(安徽)股份有限公司 一种滤波器、飞杆卡座及通信设备
CN114024112B (zh) * 2021-12-08 2022-12-30 江苏贝孚德通讯科技股份有限公司 一种直排腔电容耦合结构及耦合方法

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CN108649303A (zh) 2018-10-12
EP3823090A4 (de) 2022-04-20
BR112021000431A2 (pt) 2021-04-06
EP3823090B1 (de) 2024-08-21
WO2020010984A1 (zh) 2020-01-16

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