CN113131117A - Temperature compensation screw applied to cavity filter - Google Patents

Temperature compensation screw applied to cavity filter Download PDF

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Publication number
CN113131117A
CN113131117A CN202110413562.9A CN202110413562A CN113131117A CN 113131117 A CN113131117 A CN 113131117A CN 202110413562 A CN202110413562 A CN 202110413562A CN 113131117 A CN113131117 A CN 113131117A
Authority
CN
China
Prior art keywords
screw
temperature compensation
cavity
resonant cavity
fins
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.)
Pending
Application number
CN202110413562.9A
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Chinese (zh)
Inventor
吴秋逸
吕致远
王涵
杨毅民
吴宇宁
卿海标
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Damai Science & Technology Industry Co ltd
Xidian Univ
Original Assignee
Nanjing Damai Science & Technology Industry Co ltd
Xidian Univ
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 Nanjing Damai Science & Technology Industry Co ltd, Xidian Univ filed Critical Nanjing Damai Science & Technology Industry Co ltd
Priority to CN202110413562.9A priority Critical patent/CN113131117A/en
Publication of CN113131117A publication Critical patent/CN113131117A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00Auxiliary devices
    • H01P1/20Frequency-selective devices, e.g. filters
    • H01P1/207Hollow waveguide filters
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00Auxiliary devices
    • H01P1/30Auxiliary devices for compensation of, or protection against, temperature or moisture effects ; for improving power handling capability
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00Resonators of the waveguide type
    • H01P7/06Cavity resonators

Abstract

The embodiment of the invention relates to a temperature compensation screw applied to a cavity filter, which comprises a thermal bimetallic strip, a tuning screw and a fastening nut; the thermal bimetallic strip comprises a connecting part and a plurality of fins bent and extended from the edge of the connecting part, and a slot is arranged between every two adjacent fins; the connecting part is provided with a through hole, and the tuning screw passes through the through hole and then is connected with the fastening nut. The temperature compensation screw of the embodiment of the invention can be arranged in the resonant cavity of the cavity filter, is simple to install and low in cost, and improves the reliability of the temperature compensation of the resonant cavity.

Description

Temperature compensation screw applied to cavity filter
Technical Field
The invention relates to the technical field of communication equipment, in particular to a temperature compensation screw applied to a cavity filter, a resonant cavity comprising the temperature compensation screw and the cavity filter.
Background
With the continuous development of wireless communication systems, spectrum resources become more and more tight, and higher requirements are put on the stability of the operation of the microwave filter in order to avoid interference between adjacent channels. In practical production application, due to the influence of external environments, such as a high-temperature environment and an outer space environment, the size of the cavity filter changes to a certain extent along with the temperature, so that the working frequency band of the cavity filter shifts. Under the high-temperature environment, the working frequency band of the cavity filter can shift to low frequency; in a low temperature environment, the frequency band of the cavity filter shifts to a high frequency.
The currently common methods are: 1) a heat dissipation structure is added to accelerate heat dissipation, so that the deformation of a cavity structure is reduced to keep the stability of the filter, and the volume of equipment needs to be increased; 2) the cavity filter is made of a material with a small thermal expansion coefficient, so that the deformation of the cavity caused by temperature change is reduced to the maximum extent to realize temperature compensation, and the cost is high; 3) the combination of materials with different thermal expansion coefficients is adopted, so that the structural deformation of different materials is mutually counteracted to reduce the temperature drift, but the temperature compensation method can only be used for the temperature compensation of a filter with a lower frequency band; 4) the mechanical structure with the temperature sensor is arranged outside the resonant cavity and drives the metal rod according to the sensed environment temperature change, so that the resonant frequency of the resonant cavity is changed to realize temperature compensation, the size of the equipment is increased, and the cost is increased.
It is seen that the above methods have respective disadvantages, and there is a need to provide a new temperature compensation method to improve the prior art to meet the increasingly stringent requirements.
Disclosure of Invention
The invention mainly solves the technical problem of providing the temperature compensation screw applied to the cavity filter, and the resonant cavity and the cavity filter comprising the temperature compensation screw, and the temperature compensation screw has the advantages of simple installation, lower cost and good reliability of temperature compensation.
In order to achieve the above object, in a first aspect, an embodiment of the present invention provides a temperature compensation screw applied to a cavity filter, including a thermal bimetal, a tuning screw, and a fastening nut;
the thermal bimetallic strip comprises a connecting part and a plurality of fins bent and extended from the edge of the connecting part, and a slot is formed between every two adjacent fins;
the connecting part is provided with a through hole, and the tuning screw penetrates through the through hole and then is connected with the fastening nut.
Optionally, the connecting portion of the thermal bimetallic strip is polygonal or circular, the plurality of fins are formed by vertically bending and extending from the edge of the connecting portion, and the through hole is disposed in the center of the connecting portion.
Optionally, the thermal bimetal comprises an active layer with a larger thermal expansion coefficient and a passive layer with a smaller thermal expansion coefficient, and the active layer is disposed outside the passive layer.
In a second aspect, an embodiment of the present invention provides a resonant cavity, which includes a shell and a cover plate, where the shell and the cover plate enclose a resonant cavity, the resonant cavity further includes the temperature compensation screw as described above, the temperature compensation screw is fixed on the cover plate, and the plurality of fins are located in the resonant cavity.
In an embodiment, the resonant cavity further includes a coupling adjusting screw fixed on the cover plate and extending into the resonant cavity.
In an embodiment, the resonant cavity further includes a matching block fixed to the bottom of the housing, and the matching block is in a disc structure or a rectangular parallelepiped structure.
Optionally, different temperature compensation is achieved by adjusting the length of the bending extension of the plurality of fins from the edge of the connecting part and/or the width of the slot between two adjacent fins.
Optionally, the resonant cavity is a cylinder or a cube.
In a third aspect, an embodiment of the present invention is a cavity filter, including a housing, an input interface, and the resonant cavity as described above, where the input interface and the resonant cavity are fixed in the housing.
In one embodiment, the input interface is a standard rectangular waveguide port.
Unlike the case of the prior art, the temperature compensation screw according to the embodiment of the present invention includes a thermal bimetal, a tuning screw, and a fastening nut; the thermal bimetallic strip comprises a connecting part and a plurality of fins bent and extended from the edge of the connecting part, and a slot is arranged between every two adjacent fins; the connecting part is provided with a through hole, and the tuning screw passes through the through hole and then is connected with the fastening nut; the thermal bimetallic strip can be fixed in the resonant cavity of the cavity filter by the tuning screw and the fastening nut, under the condition of large temperature change, the plurality of wing feathers expand outwards or contract inwards, and the deformation of the wing feathers just compensates the deformation of the resonant cavity, so that the temperature compensation of the filter is realized.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a perspective view of a temperature compensating screw according to an embodiment of the present invention;
FIG. 2 is a perspective view of a temperature compensating screw according to an embodiment of the present invention from another perspective; (ii) a
FIG. 3 is an exploded view of a cavity filter according to an embodiment of the invention;
FIG. 4 is a cross-sectional view of a cavity filter with the housing removed according to an embodiment of the present invention;
FIG. 5 is a model diagram of the deformation of a temperature compensated screw at different temperatures according to an embodiment of the present invention;
FIG. 6 is a graph comparing S-parameters at different temperatures for a single cavity waveguide resonator without temperature compensation screws according to an embodiment of the present invention;
FIG. 7 is a graph comparing S-parameters of a single cavity waveguide resonator with temperature compensating screws at different temperatures according to an embodiment of the present invention.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example one
Referring to fig. 1 and 2, a temperature compensation screw 100 includes a thermal bimetal 110, a tuning screw 120, and a fastening nut 130; the thermal bimetal strip 110 includes a connecting portion 111 and a plurality of fins 112 formed by bending and extending from an edge of the connecting portion 111, a slot 113 is disposed between two adjacent fins 112, a through hole (not shown) is disposed on the connecting portion 111, and the tuning screw 120 passes through the through hole and then is connected to the fastening nut 130.
The thermal bimetal 110 is a composite material that changes shape depending on temperature change, and in this embodiment,the thermal bimetal 110 includes an active layer 110A with a large thermal expansion coefficient and a passive layer 110B with a small thermal expansion coefficient, and the active layer 110A is disposed outside the passive layer 110B. The active layer 110A is characterized by a large thermal expansion coefficient, a high melting point and good compositeness, and the active layer 110A can be generally made of manganese-copper-nickel, iron-manganese-nickel, pure iron, pure copper, pure nickel and other materials, for example, Mn can be used as an alloy of the active layer72Cu18Ni10、Ni18Cr11And Ni25Cr8And the like. The passive layer 110B is made of a low expansion coefficient nickel-iron alloy, for example, Ni36Fe, Ni40Fe, Ni45Fe, Ni50Fe, and the like can be used.
The connecting portion 111 of the thermal bimetal 110 may have a polygonal shape or a circular shape, and the plurality of fins 112 are formed by vertically bending and extending from the edge of the connecting portion 111, and the through hole is disposed at the center of the connecting portion 111.
Optionally, the connecting portion 111 of the thermal bimetal 110 is square, the thermal bimetal 110 includes four fins 112 formed by vertically bending and extending from the edge of the connecting portion 111, the through hole is disposed in the center of the square, and the connecting portion 111 of the thermal bimetal 110 is configured in a square structure, which not only facilitates processing, but also has a good temperature compensation effect. In other embodiments, the connecting portion 111 may also be triangular, pentagonal, hexagonal, etc., and accordingly, the thermal bimetal strip 110 includes three fins 112, five fins 112, and six fins 112; alternatively, the connecting portion 111 may have a circular shape, and the thermal bimetal strip 110 may include three, four or five fins 112. The shape of the connecting portion 111 is not limited in this embodiment.
Preferably, the slots 113 extend to the connecting portion 111 to increase the deformation that can occur between the plurality of fins 112.
It is understood that the positional relationship between the tuning screw 120 and the fastening nut 130 is variable, and the tuning screw 120 is shown to pass through the through hole from the bottom of the connecting portion 111 upwards and then be connected to the fastening nut 130 above, and in practical applications, the tuning screw 120 may also pass through the through hole from the top of the connecting portion 111 downwards and then be connected to the fastening nut 130 at the bottom, which may be determined by the fixing manner of the temperature compensation screw 100 in the device.
The temperature compensation screw 100 applied to the cavity filter provided by the embodiment includes a thermal bimetal strip 110, a tuning screw 120 and a fastening nut 130, where the thermal bimetal strip 110 includes a connecting portion 111 and a plurality of fins 112 formed by bending and extending from an edge of the connecting portion 111, and a slot 113 is provided between two adjacent fins 112; under the condition of large temperature change, the plurality of fins 112 of the thermal bimetallic strip 110 expand outwards or contract inwards, which is equivalent to changing the radius of the temperature compensation screw 100, and the deformation of the temperature compensation screw exactly compensates the deformation of the resonant cavity, so that the temperature compensation of the filter is realized; the temperature compensation screw 100 provided by the embodiment is simple to mount and good in reliability.
Example two
The embodiment of the invention provides a cavity filter 1, as shown in fig. 3 and 4, including a housing 10, an input interface 20 and a resonant cavity 30, where the input interface 10 and the resonant cavity 30 are fixed in the housing 10; the resonant cavity 30 includes a housing 31 and a cover plate 32, the housing 31 and the cover plate 32 enclose a resonant cavity, the temperature compensation screw 100 is disposed in the resonant cavity 30, the temperature compensation screw 100 is fixed on the cover plate 32, and the plurality of fins 112 are disposed in the resonant cavity.
There are various ways to fix the temperature compensation screw 100 on the cover plate 32, for example, the cover plate 31 is provided with a mounting hole (not shown), the fastening nut 130 of the temperature compensation screw 100 is firstly removed, the thermal bimetal 110 is attached to the bottom of the cover plate 32, and the through hole is aligned with the mounting hole, and then the tuning screw 120 is connected to the fastening nut 130 placed above the cover plate after passing through the through hole and the mounting hole from the bottom of the connecting portion 111 upwards. For another example, the cover plate 31 is provided with a mounting hole (not shown), the protruding portion of the tuning screw 120 of the temperature compensation screw 100 is inserted into the mounting hole, and then the fastening nut 130 at the bottom of the connecting portion 111 is tightened, so as to fix the temperature compensation screw 100 to the cover plate 32. One skilled in the art can also fix the temperature compensation screw 100 to the cover plate 32 in other ways as long as the plurality of fins 112 of the temperature compensation screw 100 are located in the resonant cavity.
In practical applications, by adjusting the length of the bending extension of the plurality of fins 112 from the edge of the connecting portion 111 and/or the width of the slot between two adjacent fins 112, different temperature compensation can be achieved to match filters with different cavity sizes and/or models.
Optionally, the resonant cavity 30 further comprises a tuning screw 40, and the tuning screw 40 is fixed on the cover plate 32 and extends into the resonant cavity. The coupling adjusting screw 40 can be a common steel screw, the input coupling size can be adjusted by changing the depth of the coupling adjusting screw 40 entering the resonant cavity, and the deeper the coupling adjusting screw 40 enters, the larger the input coupling is; the shallower the entry of the tuning screw 40, the less input coupling.
Optionally, the resonant cavity 30 further includes a matching block 50, the matching block 50 is fixed at the bottom of the housing 31, and the matching block 50 has a disk structure (including a right disk structure and an oval disk structure) or a rectangular parallelepiped structure. The matching block 50 may be a disk of aluminum or other material, and the cavity resonant frequency is adjusted by controlling the size and thickness of the matching block 50.
The resonant cavity is a cylinder or a cube; preferably, the resonant cavity is a cylinder to reduce dispersion and improve Q-value.
In one embodiment, the input interface 20 is a standard rectangular waveguide port, for example, the input interface 20 is a standard rectangular waveguide port of 31.75mm × 15.88 mm. The standard rectangular waveguide ports with different specifications correspond to different frequency bands, and the temperature compensation requirements of different frequency bands can be met by specifically adjusting the length of the bending and extending of the plurality of fin feathers 112 from the edge of the connecting part 111 and/or the width of the slot between two adjacent fin feathers 112.
In order to show the stability of the cavity filter 1 provided by the embodiment of the present invention in operation at different temperatures, the embodiment of the present invention further provides a temperature compensation screw sample, each physical property of the thermal bimetal material of the sample is shown in the following table, and the active layer is disposed outside the passive layer.
TABLE 3.1 physical Properties of the thermal bimetallic Material
The temperature curvature, specific bending, elastic modulus and linear temperature range are all common performance indexes of the thermal bimetal. The warm curvature refers to the curvature change of the longitudinal center line of the thermal bimetallic strip with unit thickness when the unit temperature is changed; specific bending is defined as: half of the curvature of the thermal bimetal at a longitudinal center line per unit thickness changes when changing the unit temperature; the elastic modulus refers to the ratio of stress to strain within the elastic deformation limit of the thermal bimetal; the linear temperature paradigm is defined as a specific temperature range over which the bending displacement of the thermal bimetal is linearly related to the temperature change.
Fig. 5 shows the deformation of the thermal bimetal of the temperature compensation screw at-40 c and 80 c, respectively, and it can be seen that the temperature compensation screw expands outward at low temperature, equivalently increasing the radius of the temperature compensation screw; at high temperatures, the temperature compensation screws contract inward, equivalently reducing the radius of the temperature compensation screws. When the thermal bimetallic strip with proper thickness and length is selected, the deformation of the thermal bimetallic strip just compensates the deformation of the resonant cavity, so that the temperature compensation of the cavity filter is realized.
The S (1,1) frequency response of the single-cavity waveguide resonator without the temperature compensation screw and the single-cavity waveguide resonator with the temperature compensation screw at high and low temperatures is analyzed and compared at a set normal temperature of 22 ℃. As shown in FIGS. 6 and 7, the frequency of the single-cavity resonator without the temperature compensation screw is shifted by 17MHz between-40 ℃ and 80 ℃, and the temperature drift coefficient reaches 26.153 ppm/DEG C; the single-cavity resonator with the temperature compensation screw has the frequency only shifted by 2MHz between minus 40 ℃ and 80 ℃ and the temperature drift coefficient of 3.082 ppm/DEG C, and basically realizes the temperature compensation at high and low temperatures.
It should be noted that the description of the present invention and the accompanying drawings illustrate preferred embodiments of the present invention, but the present invention may be embodied in many different forms and is not limited to the embodiments described in the present specification, which are provided as additional limitations to the present invention and to provide a more thorough understanding of the present disclosure. Moreover, the above technical features are combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention described in the specification; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A temperature compensation screw applied to a cavity filter is characterized by comprising a thermal bimetallic strip, a tuning screw and a fastening nut;
the thermal bimetallic strip comprises a connecting part and a plurality of fins bent and extended from the edge of the connecting part, and a slot is formed between every two adjacent fins;
the connecting part is provided with a through hole, and the tuning screw penetrates through the through hole and then is connected with the fastening nut.
2. The temperature-compensated screw of claim 1,
the connecting part of the thermal bimetallic strip is polygonal or circular, the plurality of fins are formed by vertically bending and extending from the edge of the connecting part, and the through hole is formed in the center of the connecting part.
3. Temperature-compensating screw as claimed in claim 1 or 2,
the thermal bimetallic strip comprises an active layer with a large thermal expansion coefficient and a passive layer with a small thermal expansion coefficient, and the active layer is arranged on the outer side of the passive layer.
4. A resonator comprising a housing and a cover plate, said housing and said cover plate enclosing a resonator cavity, wherein said resonator further comprises a temperature compensation screw according to any one of claims 1-3, said temperature compensation screw being fixed to said cover plate, and said plurality of fins being located in said resonator cavity.
5. The resonant cavity as set forth in claim 4,
the adjustable coupling screw is fixed on the cover plate and extends into the resonant cavity.
6. The resonator according to claim 4 or 5,
the matching block is fixed at the bottom of the shell and is of a disc structure or a cuboid structure.
7. The resonant cavity as set forth in claim 4,
different temperature compensation is realized by adjusting the length of the plurality of wing feathers extending from the edge of the connecting part in a bending way and/or the width of the slot between two adjacent wing feathers.
8. The resonant cavity as set forth in claim 4,
the resonant cavity is a cylinder or a cube.
9. A cavity filter comprising a housing, an input interface, and a resonant cavity as claimed in any of claims 4 to 8, wherein the input interface and the resonant cavity are secured within the housing.
10. The cavity filter of claim 9,
the input interface is a standard rectangular waveguide port.
CN202110413562.9A 2021-04-16 2021-04-16 Temperature compensation screw applied to cavity filter Pending CN113131117A (en)

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Application Number Priority Date Filing Date Title
CN202110413562.9A CN113131117A (en) 2021-04-16 2021-04-16 Temperature compensation screw applied to cavity filter

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Application Number Priority Date Filing Date Title
CN202110413562.9A CN113131117A (en) 2021-04-16 2021-04-16 Temperature compensation screw applied to cavity filter

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0883203A2 (en) * 1997-06-02 1998-12-09 Com Dev Ltd. Filter with temperature compensated tuning screw
CN1353875A (en) * 1999-06-04 2002-06-12 奥根公司 Temp-compensated rod resonator
CN201222530Y (en) * 2008-06-30 2009-04-15 摩比天线技术(深圳)有限公司 Coaxial cavity resonator and coaxial cavity filter
CN102354780A (en) * 2011-07-22 2012-02-15 深圳市大富科技股份有限公司 Cavity filter and communication device
CN203617411U (en) * 2013-11-29 2014-05-28 深圳市虹远通信有限责任公司 Duplexer temperature compensation device
CN104838537A (en) * 2012-10-25 2015-08-12 凯瑟雷恩工厂两合公司 Tunable high frequency filter
US9865909B2 (en) * 2016-02-17 2018-01-09 Northrop Grumman Systems Corporation Cavity resonator with thermal compensation
WO2018119669A1 (en) * 2016-12-27 2018-07-05 华为技术有限公司 Resonator and communication device
CN108370077A (en) * 2015-12-04 2018-08-03 瑞典爱立信有限公司 Coaxial resonator with dielectric disc
CN111430860A (en) * 2020-03-23 2020-07-17 成都天奥电子股份有限公司 Resonant cavity structure for realizing temperature self-compensation and cavity filter

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0883203A2 (en) * 1997-06-02 1998-12-09 Com Dev Ltd. Filter with temperature compensated tuning screw
CN1353875A (en) * 1999-06-04 2002-06-12 奥根公司 Temp-compensated rod resonator
CN201222530Y (en) * 2008-06-30 2009-04-15 摩比天线技术(深圳)有限公司 Coaxial cavity resonator and coaxial cavity filter
CN102354780A (en) * 2011-07-22 2012-02-15 深圳市大富科技股份有限公司 Cavity filter and communication device
CN104838537A (en) * 2012-10-25 2015-08-12 凯瑟雷恩工厂两合公司 Tunable high frequency filter
CN203617411U (en) * 2013-11-29 2014-05-28 深圳市虹远通信有限责任公司 Duplexer temperature compensation device
CN108370077A (en) * 2015-12-04 2018-08-03 瑞典爱立信有限公司 Coaxial resonator with dielectric disc
US9865909B2 (en) * 2016-02-17 2018-01-09 Northrop Grumman Systems Corporation Cavity resonator with thermal compensation
WO2018119669A1 (en) * 2016-12-27 2018-07-05 华为技术有限公司 Resonator and communication device
CN111430860A (en) * 2020-03-23 2020-07-17 成都天奥电子股份有限公司 Resonant cavity structure for realizing temperature self-compensation and cavity filter

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