WO2015010600A1 - Filtre à cavité, ligne à prises et procédé de régulation du retard de couplage du filtre à cavité - Google Patents

Filtre à cavité, ligne à prises et procédé de régulation du retard de couplage du filtre à cavité Download PDF

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Publication number
WO2015010600A1
WO2015010600A1 PCT/CN2014/082708 CN2014082708W WO2015010600A1 WO 2015010600 A1 WO2015010600 A1 WO 2015010600A1 CN 2014082708 W CN2014082708 W CN 2014082708W WO 2015010600 A1 WO2015010600 A1 WO 2015010600A1
Authority
WO
WIPO (PCT)
Prior art keywords
cavity
cavity filter
resonant
wound inductor
tap
Prior art date
Application number
PCT/CN2014/082708
Other languages
English (en)
Chinese (zh)
Inventor
李贤祥
陈伟
徐晓亮
Original Assignee
深圳市大富科技股份有限公司
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 深圳市大富科技股份有限公司 filed Critical 深圳市大富科技股份有限公司
Publication of WO2015010600A1 publication Critical patent/WO2015010600A1/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
    • H01P1/207—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/10—Dielectric resonators

Definitions

  • the present invention relates to the technical field of cavity filters, and in particular to a method for adjusting a cavity filter, a tap line, and a cavity filter coupling delay.
  • FIG. 1 is a cross-sectional view of a cavity filter of the prior art 1, wherein the tap line 140 is a silver-plated copper wire, one end of which is soldered to the resonant column 130 of the cavity 110, and the other end is The welding of the signal transmitting and receiving end 120 transmits a signal between the resonant column 130 and the signal transmitting and receiving end 120.
  • the delay of the tap line is determined. Due to processing and assembly errors, it is difficult to ensure the consistency of the tap line strength of each product. If the delay of the tap is not suitable when debugging the product, it is necessary to disassemble the cavity for maintenance, by changing the length of the tap line. And the shape of the bend can change the delay of the tap, which seriously affects the production efficiency.
  • FIG. 2 is a cross-sectional view of the cavity filter of the prior art 2.
  • the prior art provides the following
  • the tap line 240-end is soldered to the resonant column 230 of the cavity 210, and the other end is soldered to the signal transceiver terminal 220.
  • An adjustment screw 250 is disposed at the cover 260 of the cavity filter opposite to the tap line 240. By controlling the depth of the adjustment screw 250 into the cavity and disturbing the electromagnetic field near the tap line 140, the adjustment of the tap strength can be achieved. Referring to FIG. 3, FIG.
  • FIG 3 is a waveform diagram of a port delay corresponding to the tapped line form of the cavity filter in the prior art.
  • the screw 250 is far from the tap line, and the electromagnetic field is concentrated on the tap line 240. The surface and its close space, so this way the adjustment of the delay of the tap line 240 is very limited.
  • Embodiments of the present invention provide a method for adjusting a cavity filter, a tap line, and a cavity filter coupling delay to solve the problem that the cavity filter delay cannot be adjusted or the adjustment range is small in the prior art. Question.
  • an embodiment of the present invention provides a cavity filter, including a cavity and a cover plate, the cover plate covers a resonant cavity formed by the cavity, and a resonant column is disposed in the resonant cavity.
  • a signal transmitting and receiving end is disposed on a cavity wall of the resonant cavity, a tap line is disposed between the resonant column and the signal transmitting and receiving end, and the tap line transmits an electrical signal between the resonant column and the signal transmitting and receiving end
  • the tapping wire is provided with a winding inductance, and the bottom of the cover plate or the cavity is provided with an adjusting screw extending into the winding inductance opening, and the adjusting screw extends into the winding The depth within the wire inductance opening is adjustable.
  • the winding inductance is integrally formed with the tap line.
  • the winding inductance has a number of turns of one or more turns. According to a preferred embodiment of the invention, the winding inductance has a circular cross section.
  • the cover or the bottom of the cavity is provided with a threaded hole, and the adjusting screw is screwed to the cover or the bottom of the cavity.
  • the present invention also provides a tap line for a cavity filter, the winding wire being provided with a winding inductance.
  • the winding inductance is integrally formed with the tap line.
  • the winding inductance has a circular cross section.
  • the winding inductance has a number of turns of one or more turns.
  • the present invention further provides a method for adjusting a coupling delay of a cavity filter, the cavity filter includes a cavity, a cover plate, and the cover plate covers a resonant cavity formed by the cavity, a resonant column is disposed in the resonant cavity, a signal transmitting end is disposed on a cavity wall of the resonant cavity, and a tap line is disposed between the resonant column and the signal transmitting and receiving end, and the tap line is in the resonant column An electrical signal is transmitted between the signal transmitting and receiving ends, the tapping wire is provided with a winding inductance, and the bottom of the cover plate or the cavity is provided with an adjusting screw extending into the winding inductance opening;
  • the adjustment of the coupling delay of the cavity filter is achieved by adjusting the depth of the adjustment screw into the winding inductance opening.
  • the cavity filter provided by the present invention has a winding inductance on the tap line.
  • the magnetic field of the tap line is concentrated in a large space around the winding inductance opening, so that the adjustment screw extends into the depth of the tapping inductance opening to greatly disturb the magnetic field of the tap line, thereby greatly changing the tap line.
  • the strength of the delay Especially when the high-frequency signal passes through the winding inductance, the electromagnetic field around the winding inductance is very strong. In this case, the adjustment range of the adjustment screw to the strength of the tap is very large.
  • the embodiment of the present invention also reduces the maintenance rate of the cavity filter: Due to the assembly tolerance of the cavity filter, the delay of the tap line is usually inconsistent, and the conventional method needs to open the cavity. The body filter reassembles the tap line, and the present application only needs to adjust the depth of the adjusting screw to extend into the winding inductance opening to complete the delay adjustment of the cavity filter.
  • FIG. 1 is a cross-sectional view of a cavity filter of the prior art 1;
  • Figure 2 is a cross-sectional view of a cavity filter of the prior art 2;
  • FIG. 3 is a waveform diagram of a port delay corresponding to a tapped line form of a cavity filter in the prior art
  • FIG. 4 is a cross-sectional view showing a structure of a cavity filter according to a preferred embodiment of the present invention
  • Fig. 5 is a waveform diagram showing the corresponding port delay when the adjusting screw enters the winding inductance by 10 mm in the form of the tap line of the cavity filter in the embodiment of Fig. 4.
  • FIG. 4 is a cross-sectional view showing a structure of a cavity filter according to a preferred embodiment of the present invention.
  • the cavity filter includes a cavity 310 and a cover 320.
  • the cover 320 covers the cavity 310.
  • a resonant cavity 330 is formed, the resonant cavity 330 is provided with a resonant column 340, a cavity transceiver wall 350 is disposed on the cavity wall of the resonant cavity 340, and a tap line 360 is disposed between the resonant column 340 and the signal transmitting and receiving end 350.
  • the tap line 360 transmits an electrical signal between the resonant column 340 and the signal transceiving end 350.
  • the tap line 360 is provided with a winding inductance 370, and the cover 320 or the bottom of the cavity 310 is provided with the winding.
  • the adjusting screw 380 in the opening of the wire inductor 370 is adjustable in depth within the opening of the winding inductor 370.
  • the tap wire 360 and the wire winding inductor 370 may be fabricated separately and then joined together by soldering or riveting, but preferably, the tap wire 360 is integrally formed with the wire wound inductor 370.
  • the number of turns of the winding inductance 370 may be 1 ⁇ or more, preferably 2 to 6 ⁇ .
  • the number of turns of the winding inductor 370 should not be too small, and the inductance of the winding inductor 370 is not strong enough to reduce the adjustment range of the delay of the tap line 360.
  • the number of turns of the winding inductance 370 should not be too large, because the winding inductance 370 is disposed on the tap line 360, that is, the winding inductance 370 is part of the tap line 360, and the length of the tap line 360 is limited, most Good for a quarter wavelength.
  • the winding inductor 370 may have a square or other cross section. However, preferably, the winding inductor 370 has a circular cross section, and the longitudinal inductance of the winding inductor 370 may be small and large at both ends.
  • the waist drum type has a large curved neck shape, a conical shape or the like at both ends, but preferably, the winding inductor 370 has a rectangular cross section, that is, the entire winding inductance 370 is a straight spiral shape because The wound inductor 370 of this shape is easier to manufacture.
  • both ends of the tap line 360 are provided with pins, and the tap line 360 is soldered to the resonant column 340 and the signal transmitting and receiving end 350 by pins.
  • the cover 320 or the bottom of the cavity 310 is provided with a threaded hole, and the screw 380 is screwed to the bottom of the cover 320 or the cavity 310.
  • the present invention also provides a tap line for a cavity filter having a winding inductance.
  • the winding inductance is integrally formed with the tap line.
  • the number of turns of the winding inductor It may be 1 ⁇ or more, preferably, the number of turns of the winding inductance is 2 to 6 ⁇ , and the winding inductance has a circular cross section.
  • the magnetic field of the tap line 360 is concentrated in a large space around the inner hole of the winding inductance 370, thus adjusting The insertion of the screw 380 into the opening extending into the opening of the winding inductor 370 can greatly disturb the magnetic field of the tap line 360, thereby greatly changing the delay of the tap line 360.
  • the technical solution of the embodiment also reduces the maintenance rate of the cavity filter: due to the assembly tolerance of the cavity filter, the delay of the tap line 360 is usually inconsistent, the conventional The method requires opening the cavity filter to reassemble the tap line 360, but now only the depth of the adjustment screw 380 into the opening of the winding inductor 370 needs to be adjusted to complete the delay adjustment of the cavity filter.
  • the embodiment of the present invention further provides a method for adjusting the coupling delay of the cavity filter, wherein the structure of the cavity filter is the same as that of the above embodiment, and details are not described herein again.
  • the main technical indicators that need to be debugged in the cavity filter include differential loss, suppression, return loss, group delay, etc., and these indicators are adjusted by adjusting the resonant frequency of each cavity, the coupling between the cavity and the cavity, and the cross-coupling.
  • the amount of coupling and the amount of coupling between input and output can be adjusted by adjusting the coupling screw between the screw and the two chambers, but the input-output coupling is usually ignored.
  • the input-output coupling of the cavity filter directly reflects the actual bandwidth of the filter.
  • the conventional input-output coupling can be relatively controlled by the fixture to ensure a relatively stable value.
  • the index margin is small and the structure is complicated, so the coupling amount of the input and output is inevitable. More control requirements.
  • Conventional methods are difficult to ensure consistent input-output coupling during mass production.
  • the method for adjusting the coupling delay of the cavity filter adjusts the coupling delay of the cavity filter by adjusting the depth of the adjusting screw extending into the winding inductance opening.
  • the specific parameters are as follows: In this embodiment, the outer diameter of the cavity is 35 mm, the height is 25 mm, the height of the resonant column is 16.5 mm, the outer diameter is 10 mm, the inner diameter is 8 mm, the outer diameter of the winding inductor is 12 mm, the diameter of the spiral is 1 mm, and the number of turns of the coil is 1.5. Adjust the screw diameter 5mm, adjustable range is 0-19mm.
  • the number of turns of the coil can be increased or the diameter of the adjusting screw can be increased, and the adjustable range of the loaded Q value is also increased.
  • the attached table is the loaded Q value (ie, the change of the port group delay) when the adjusting screw enters the different depth tap lines in the embodiment.
  • FIG. 5 is a waveform diagram of the corresponding port delay when the adjusting screw enters the winding inductance of 10 mm in the form of the tap line of the cavity filter in the embodiment of FIG. 4, and ⁇ obviously, after adjusting the adjusting screw, the delay ( The vertical axis in the waveform diagram becomes smaller; in addition, it can be seen from the attached table that as the length of the winding inductance of the adjusting screw increases, the load Q value of the filter (ie, the change in the port group delay value) small.
  • the tuning screw of the tuning mechanism can further achieve a smaller port delay, and the actual verification adjustable range can meet the filter application with a bandwidth of several megabytes to several hundred megabytes. It also enables a greater reduction in machining accuracy and assembly tolerances.
  • the required input and output Qe values can be adjusted over a wide range.

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Abstract

La présente invention concerne un filtre à cavité, une ligne à prises et un procédé de régulation d'un retard de couplage du filtre à cavité. Le filtre à cavité comprend une cavité et une plaque de protection. La plaque de protection recouvre et scelle une cavité résonante formée par la cavité, une colonne résonante est disposée à l'intérieur de la cavité résonante, une extrémité d'émetteur/récepteur de signal est disposée sur une paroi de cavité de la cavité résonante, une ligne à prises est disposée entre la colonne résonante et l'extrémité d'émetteur/récepteur de signal et la ligne à prises transmet un signal électrique entre la colonne résonante et l'extrémité d'émetteur/récepteur de signal. La ligne à prises est munie d'une inductance à fil bobiné, une vis de réglage qui peut pénétrer dans l'inductance à fil bobiné à travers une ouverture de celle-ci se trouve sur la plaque de protection ou le fond de la cavité, et la profondeur de laquelle la vis de réglage pénètre dans l'inductance à fil bobiné à travers l'ouverture peut être régulée. Dans la présente invention, une inductance à fil bobiné est disposée sur une ligne à prises et la longueur sur laquelle une vis de réglage est insérée dans l'inductance à fil bobiné est régulée de manière à réguler un retard de couplage d'un filtre à cavité.
PCT/CN2014/082708 2013-07-22 2014-07-22 Filtre à cavité, ligne à prises et procédé de régulation du retard de couplage du filtre à cavité WO2015010600A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201320435131.3 2013-07-22
CN201320435131.3U CN203386873U (zh) 2013-07-22 2013-07-22 腔体滤波器及抽头线

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WO2015010600A1 true WO2015010600A1 (fr) 2015-01-29

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203386873U (zh) * 2013-07-22 2014-01-08 深圳市大富科技股份有限公司 腔体滤波器及抽头线
CN105453333A (zh) * 2014-07-22 2016-03-30 深圳市大富科技股份有限公司 腔体滤波器、抽头线以及腔体滤波器耦合时延的调节方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1667868A (zh) * 2005-02-24 2005-09-14 俞聿光 1MHz－100MHz频段腔体式低损耗合路器
CN201417810Y (zh) * 2009-05-06 2010-03-03 摩比天线技术（深圳）有限公司 带信号端口的无线通信装置
CN101834334A (zh) * 2010-05-07 2010-09-15 摩比天线技术（深圳）有限公司 一种同轴腔体滤波器耦合方法及其耦合端口
CN203386873U (zh) * 2013-07-22 2014-01-08 深圳市大富科技股份有限公司 腔体滤波器及抽头线

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1667868A (zh) * 2005-02-24 2005-09-14 俞聿光 1MHz－100MHz频段腔体式低损耗合路器
CN201417810Y (zh) * 2009-05-06 2010-03-03 摩比天线技术（深圳）有限公司 带信号端口的无线通信装置
CN101834334A (zh) * 2010-05-07 2010-09-15 摩比天线技术（深圳）有限公司 一种同轴腔体滤波器耦合方法及其耦合端口
CN203386873U (zh) * 2013-07-22 2014-01-08 深圳市大富科技股份有限公司 腔体滤波器及抽头线

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