CN111613860A - Medium loading adjustable filter with bimetal diaphragm structure - Google Patents
Medium loading adjustable filter with bimetal diaphragm structure Download PDFInfo
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- CN111613860A CN111613860A CN202010501787.5A CN202010501787A CN111613860A CN 111613860 A CN111613860 A CN 111613860A CN 202010501787 A CN202010501787 A CN 202010501787A CN 111613860 A CN111613860 A CN 111613860A
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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
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Abstract
The invention discloses a medium-loaded adjustable filter with a bimetallic diaphragm structure, which comprises a first waveguide, a second waveguide, a first metal diaphragm, a second metal diaphragm, a middle cavity block, a medium diaphragm and a driving device, wherein the first metal diaphragm is arranged between the first waveguide and the middle cavity block, the second metal diaphragm is arranged between the second waveguide and the middle cavity block, a second cavity is arranged on one side of the second waveguide, which faces the second metal diaphragm, the medium diaphragm is positioned in the second cavity, the medium diaphragm is connected with the driving device, and the driving device drives the medium diaphragm to move in the second cavity. Compared with a single-metal diaphragm structure, the bimetal diaphragm filter has the advantages that the coupling coefficient change of the filter is small in the process of frequency tuning by moving the dielectric diaphragm, so that the absolute bandwidth of the filter is almost kept unchanged in the tuning process, the in-band standing wave deterioration is small in the tuning process, and the good in-band and out-of-band electrical performance is finally kept.
Description
Technical Field
The invention relates to the technical field of microwaves, in particular to a medium-loaded adjustable filter with a bimetal diaphragm structure.
Background
In the field of communications, filters are widely used as a frequency selection device. With the development of wireless communication, different filter structures have emerged to meet different application environments. In the 5G millimeter wave pass-back frequency band, the number of subdivided sub-frequency bands is large, if an adjustable filter with good performance can be designed, all the sub-frequency bands of the required frequency band are covered, the adjustability of the filter within a certain frequency range is realized, the platformization of the filter is promoted, the system type of filters with various pass bands and different models is facilitated, and the manufacturing cost and the manual replacement cost are reduced, so that the great significance is realized.
At present, the design of tunable filters is mainly realized by adding a tuning mechanism on the basis of waveguide filters.
Most of traditional E-plane filters use a single-diaphragm structure with a metal diaphragm sandwiched in the middle, the metal diaphragm, a first metal cavity and a second metal cavity are independently manufactured and then screwed together, tuning screws are omitted through control over machining precision of the diaphragms, and the traditional E-plane filters can be used as a basis for achieving a filter adjustable structure of a millimeter wave frequency band.
However, the conventional E-plane filter with a single metal diaphragm structure still has the disadvantage that when the tuning range is wider or the tuning range is tuned to some special frequency points, the return loss in the band is rapidly deteriorated, so that the function of the filter is disabled. Meanwhile, the dielectric sheet of many E-plane tunable filters reported before moves along the length direction of the metal cavity, which easily causes the dielectric sheet to be broken and broken, and seriously affects the engineering practicability of the filter
Disclosure of Invention
The invention aims to provide a medium-loaded tunable filter with a bimetallic diaphragm structure, which can solve most of the technical problems. The technical scheme of the invention is as follows:
the medium-loaded adjustable filter with the double-metal diaphragm structure comprises a first waveguide, a second waveguide, a first metal diaphragm, a second metal diaphragm, a middle cavity block, a medium diaphragm and a driving device, wherein the first waveguide and the second waveguide are oppositely arranged, the middle cavity block is positioned between the first waveguide and the second waveguide, the first metal diaphragm is arranged between the first waveguide and the middle cavity block, the second metal diaphragm is arranged between the second waveguide and the middle cavity block, a first cavity is arranged on one side of the first waveguide facing the first metal diaphragm, a second cavity is arranged on one side of the second waveguide facing the second metal diaphragm, the medium diaphragm is positioned in the second cavity, the medium diaphragm is connected with the driving device, and the driving device drives the medium diaphragm to move in the second cavity.
The bimetallic diaphragm structure filter can keep the absolute bandwidth basically unchanged in the tuning process and ensure that the tunable filter can keep better in-band return loss performance in the tuning process. Compared with a single-diaphragm structure, the double-diaphragm structure is innovatively adopted, and the coupling coefficient change is small in the moving frequency modulation process of the dielectric diaphragm, so that the absolute bandwidth is kept almost unchanged in the tuning process, the in-band and out-band indexes are guaranteed not to be obviously deteriorated, the in-band standing wave deterioration is small in the tuning process, and the good in-band and out-band electrical performance is finally kept.
The tunable filter can be used for a tunable duplexer, mainly aims at the 6-42GHz frequency band of the traditional microwave return, and can be considered to be applied to 5G hot frequency bands such as E-band and the like. In some embodiments, the first cavity extends along a length of the first waveguide and the second cavity extends along a length of the second waveguide.
In some embodiments, the driving device drives the medium diaphragm to move in the depth direction of the second cavity, the driving device includes a motor, a conversion mechanism and a support rod, the motor is in power connection with the conversion mechanism, the conversion mechanism is in power connection with the support rod, the support rod penetrates through the second waveguide and penetrates out of the second cavity, the support rod is connected with the medium diaphragm, and the conversion mechanism converts the rotation of the motor into the jacking motion of the support rod. The lifting mechanism has the beneficial effects that the lifting movement of the supporting rod is realized through the matching of the motor and the conversion mechanism, so that the medium diaphragm is driven to move in the depth direction of the second cavity. Usually, the motor can be a stepping motor, and the movement of the central frequency of the filter and the distance of the dielectric diaphragm extending into the second cavity are almost in a linear relation, so that the required central frequency is easily controlled during adjustment, and the frequency accuracy is ensured.
In addition, by optimally designing the size and the notch position of the dielectric diaphragm, the coupling coefficient of the filter can be kept basically unchanged while the frequency is tuned, so that the absolute bandwidth is almost unchanged in the tuning process, the echo is better, and the out-of-band rejection is better.
The invention adopts the transmission structure of the motor, the conversion mechanism and the support rod and the reasonable design of the medium diaphragm, so that the motor can drive the medium diaphragm to move very accurately, and the conditions of breakage, bending and the like of the medium diaphragm are ensured not to occur easily. Therefore, the metal diaphragm can not be used for replacement, the electric performance is better, and the practical application requirements of engineering are met.
In some embodiments, the support rod is made of an insulating material. The support rod has the beneficial effects that the support rod is made of high-strength materials, and a metal column cannot be adopted. Through the frock location, bond bracing piece and medium diaphragm together. The supporting rod is made of an insulating material with a low dielectric constant, and compared with a metal material, the supporting rod cannot greatly influence electromagnetic waves in the waveguide.
In some embodiments, a plurality of guide holes penetrating through the second waveguide are formed in the bottom of the second cavity, and the support rods pass through the guide holes, and at least two support rods are provided. The supporting rod has the beneficial effects that the supporting rod is matched with the guide hole, so that the stable jacking of the medium diaphragm can be realized, and the medium diaphragm is not easy to break and damage.
In some embodiments, the conversion mechanism is a gear set structure or a worm gear structure or a lead screw nut structure. The supporting rod has the advantages that the speed reduction of the motor can be realized through the gear set mechanism or the worm and gear structure or the screw nut structure, and meanwhile, the rotation operation of the motor can be converted into the jacking motion of the supporting rod, so that the driving of the medium diaphragm is realized.
In some embodiments, a third cavity is disposed on the middle cavity block, and the first cavity, the second cavity and the third cavity are on the same straight line. The electromagnetic wave tuning device has the advantages of ensuring normal passing of electromagnetic waves and being convenient for realizing tuning.
In some embodiments, the first waveguide, the first metallic diaphragm, the second waveguide, the second metallic diaphragm, and the intermediate cavity block are pierced with locating pins. The center alignment structure has the advantages that through the arrangement of the positioning pins, the relative positions of the first waveguide body, the first metal diaphragm, the second waveguide body, the second metal diaphragm and the middle cavity block cannot be displaced, and center alignment is easy to realize.
In some embodiments, the first waveguide, the first metal diaphragm, the second waveguide, the second metal diaphragm and the intermediate cavity block are provided with fastening screws. The double-metal-diaphragm-structure medium-loading adjustable filter has the advantages that the first waveguide, the first metal diaphragm, the second waveguide, the second metal diaphragm and the middle cavity block can be fastened through the fastening screws, and therefore the double-metal-diaphragm-structure medium-loading adjustable filter is assembled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of an assembled structure of a dielectric loaded tunable filter with a bimetal diaphragm structure according to an embodiment of the present invention;
fig. 2 is an exploded view of a tunable filter with a bimetal diaphragm structure according to an embodiment of the present invention;
fig. 3 is a schematic partial cross-sectional view of a dielectric loaded tunable filter with a bimetallic diaphragm structure according to an embodiment of the present invention;
FIG. 4 is a schematic view of an assembled structure of a dielectric diaphragm according to an embodiment of the present invention;
fig. 5 is a simulated S-parameter diagram of a tunable filter with a bimetal diaphragm structure according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating some embodiments of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "both ends", "both sides", "bottom", "top", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," "upper," "lower," "primary," "secondary," and the like are used for descriptive purposes only and may be used for purposes of simplicity in more clearly distinguishing between various components and not to indicate or imply relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are used broadly and can be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or connected through the inside of two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 4, the tunable filter with a bimetal diaphragm structure disclosed in the present invention includes a first waveguide 1, a second waveguide 2, a first metal diaphragm 3, a second metal diaphragm 4, an intermediate cavity block 5, a dielectric diaphragm 6 and a driving device 7, wherein the first waveguide 1 is disposed opposite to the second waveguide 2, the intermediate cavity block 5 is disposed between the first waveguide 1 and the second waveguide 2, the first metal diaphragm 3 is disposed between the first waveguide 1 and the intermediate cavity block 5, the second metal diaphragm 4 is disposed between the second waveguide 2 and the intermediate cavity block 5, a first cavity 8 is disposed on a side of the first waveguide 1 facing the first metal diaphragm 3, a second cavity 9 is disposed on a side of the second waveguide 2 facing the second metal diaphragm 4, the dielectric diaphragm 6 is disposed in the second cavity 9, the dielectric diaphragm 6 is connected to the driving device 7, the drive means 7 drives the movement of the medium diaphragm 6 in the second chamber 9.
Fig. 5 is a schematic diagram showing simulated S parameters of a dielectric loaded tunable filter with a bimetal diaphragm structure according to an embodiment of the present invention.
The bimetallic diaphragm structure filter can keep the absolute bandwidth basically unchanged in the tuning process, and can ensure that the tunable filter can keep better in-band return loss performance in the tuning process. Compared with a single-diaphragm structure, the double-diaphragm structure is innovatively adopted, and the coupling coefficient change is small in the moving frequency modulation process of the dielectric diaphragm 6, so that the absolute bandwidth is kept almost unchanged in the tuning process, the in-band and out-band indexes are guaranteed not to be obviously deteriorated, the in-band standing wave deterioration in the tuning process is small, and the good in-band and out-band electrical performance is finally kept.
The tunable filter can be used for a tunable duplexer, mainly aims at a 6-42Ghz frequency band, and can also be expanded to a 5G back heat transfer frequency band such as an E-band.
Wherein the first cavity 8 extends along the length of the first waveguide 1 and the second cavity 9 extends along the length of the second waveguide 2.
The driving device 7 in the present invention may be provided in various forms as long as it can drive the medium diaphragm 6 to move in the depth direction of the second cavity 9. In the present embodiment, the driving device 7 includes a motor 10, a converting mechanism 11 and a supporting rod 12, the motor 10 is in power connection with the converting mechanism 11, the converting mechanism 11 is in power connection with the supporting rod 12, the supporting rod 12 passes through the second waveguide 2 and passes through the second cavity 9, the supporting rod 12 is connected with the dielectric diaphragm 6, and the converting mechanism 11 converts the rotation of the motor 10 into the lifting motion of the supporting rod 12. Through the cooperation of the motor 10 and the conversion mechanism 11, the jacking motion of the support rod 12 is realized, so that the medium diaphragm 6 is driven to move in the depth direction of the second cavity 9. In general, the motor 10 can be a stepping motor 10, and the shift of the center frequency of the filter and the distance of the dielectric diaphragm 6 extending into the second cavity 9 are almost linear, so that the required center frequency can be easily controlled during adjustment, and the frequency accuracy is ensured.
In addition, by optimally designing the size and the notch position of the dielectric diaphragm 6, the coupling coefficient of the filter can be kept basically unchanged while the frequency is tuned, so that the bandwidth is kept unchanged in the tuning process, the echo is better, and the out-of-band rejection is better.
Because the invention adopts the transmission structure of the motor 10, the conversion mechanism 11 and the support rod 12 and the reasonable design of the medium diaphragm 6, the motor 10 can drive the medium diaphragm 6 to move very accurately, and the conditions of breaking, bending and the like of the medium diaphragm 6 are ensured not to occur easily. Therefore, the metal diaphragm can not be used for replacement, the electric performance is better, and the practical application requirements of engineering are met.
The support rod 12 is made of an insulating material. The support rod 12 is made of high-strength material, and a metal column is not used. The support rod 12 and the medium membrane 6 are bonded together through tool positioning. The supporting rod 12 is made of an insulating material, which will not conduct electricity and will not affect the electromagnetic wave.
Wherein, a plurality of guiding holes 13 penetrating through the second waveguide 2 are arranged at the bottom of the second cavity 9, the supporting rods 12 penetrate through the guiding holes 13, and at least two supporting rods 12 are arranged. Through the cooperation of bracing piece 12 and guiding hole 13 to can realize the stable jacking of medium diaphragm 6, thereby medium diaphragm 6 is difficult for fracture and damaged.
The conversion mechanism 11 of the invention can be in a gear set structure, a worm gear structure or a screw nut structure. The beneficial effects are that, through gear train mechanism or worm gear structure or screw-nut structure to can realize the speed reduction of motor 10, can be with the rotatory operation of motor 10 simultaneously, turn into the jacking motion of bracing piece 12, thereby realize the drive to medium diaphragm 6.
In the invention, the middle cavity block 5 is provided with a third cavity 14, and the first cavity 8, the second cavity 9 and the third cavity 14 are on the same straight line. Thereby ensuring the normal passage of electromagnetic waves and being convenient for realizing tuning.
Positioning pins 15 are arranged on the first waveguide 1, the first metal diaphragm 3, the second waveguide 2, the second metal diaphragm 4 and the middle cavity block 5 in a penetrating mode. By arranging the positioning pins 15, the relative positions of the first waveguide 1, the first metal diaphragm 3, the second waveguide 2, the second metal diaphragm 4 and the intermediate cavity block 5 can be prevented from being displaced, and the center alignment can be easily realized.
Fastening screws 16 penetrate through the first waveguide 1, the first metal diaphragm 3, the second waveguide 2, the second metal diaphragm 4 and the middle cavity block 5. Through the arrangement of the fastening screws 16, the first waveguide 1, the first metal diaphragm 3, the second waveguide 2, the second metal diaphragm 4 and the middle cavity block 5 can be fastened, so that the assembly of the dielectric loaded tunable filter of the bimetal diaphragm structure is realized.
The above embodiments of the present invention are only used for illustrating the technical solutions of the present invention, and not for limiting the same, it should be understood that, for those skilled in the art, modifications or substitutions can be made on the basis of the above description without departing from the inventive concept, and all such modifications and substitutions shall fall within the protection scope of the appended claims. In this case all the details may be replaced with equivalent elements, and the materials, shapes and dimensions may be any.
Claims (10)
1. The dielectric loading tunable filter with the bimetal diaphragm structure is characterized by comprising a first waveguide (1), a second waveguide (2), a first metal diaphragm (3), a second metal diaphragm (4), a middle cavity block (5), a dielectric diaphragm (6) and a driving device (7), wherein the first waveguide (1) and the second waveguide (2) are oppositely arranged, the middle cavity block (5) is positioned between the first waveguide (1) and the second waveguide (2), the first metal diaphragm (3) is arranged between the first waveguide (1) and the middle cavity block (5), the second metal diaphragm (4) is arranged between the second waveguide (2) and the middle cavity block (5), a first cavity (8) is arranged on one side of the first waveguide (1) facing the first metal diaphragm (3), a second cavity (9) is formed in one side, facing the second metal diaphragm (4), of the second waveguide (2), the medium diaphragm (6) is located in the second cavity (9), the medium diaphragm (6) is connected with the driving device (7), and the driving device (7) drives the medium diaphragm (6) to move in the second cavity (9).
2. The tunable filter with a bimetal diaphragm structure as defined in claim 1, wherein the first cavity (8) extends along the length direction of the first waveguide (1) and the second cavity (9) extends along the length direction of the second waveguide (2).
3. The tunable filter with a bimetal diaphragm structure loaded by a medium as claimed in claim 1, wherein the material of the dielectric diaphragm (6) is a low-dielectric constant and low-loss medium.
4. The tunable filter with media loading of bimetallic diaphragm structure as in claim 1, characterized in that the driving device (7) drives the media diaphragm (6) to move in the depth direction of the second cavity (9), the driving device (7) comprises a motor (10), a conversion mechanism (11) and a support rod (12), the motor (10) is in power connection with the conversion mechanism (11), the conversion mechanism (11) is in power connection with the support rod (12), the support rod (12) passes through the second waveguide (2) and penetrates out of the second cavity (9), the support rod (12) is connected with the media diaphragm (6), and the conversion mechanism (11) converts the rotation of the motor (10) into the lifting motion of the support rod (12).
5. The dielectrically-loaded tunable filter of a bimetallic diaphragm structure as claimed in claim 4, characterised in that the support rod (12) is of an insulating material.
6. The tunable filter with a bimetal diaphragm structure loaded by medium as claimed in claim 4, wherein a plurality of guide holes (13) penetrating through the second waveguide (2) are formed at the bottom of the second cavity (9), the support rods (12) pass through the guide holes (13), and at least two support rods (12) are provided.
7. The double metal diaphragm structured media-loaded tunable filter according to claim 4, wherein the conversion mechanism (11) is a gear train structure or a worm gear structure or a lead screw nut structure.
8. The double-metal diaphragm structured medium-loaded tunable filter according to claim 1, wherein the middle cavity block (5) is provided with a third cavity (14), and the first cavity (8), the second cavity (9) and the third cavity (14) are in the same straight line.
9. The tunable filter with a bimetal diaphragm structure loaded by medium as claimed in claim 1, characterized in that positioning pins (15) are arranged on the first waveguide body (1), the first metal diaphragm (3), the second waveguide body (2), the second metal diaphragm (4) and the middle cavity block (5) in a penetrating way.
10. The double-metal diaphragm structured dielectric-loaded tunable filter according to claim 9, wherein the first waveguide (1), the first metal diaphragm (3), the second waveguide (2), the second metal diaphragm (4) and the intermediate cavity block (5) are provided with fastening screws (16) therethrough.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010501787.5A CN111613860A (en) | 2020-06-04 | 2020-06-04 | Medium loading adjustable filter with bimetal diaphragm structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010501787.5A CN111613860A (en) | 2020-06-04 | 2020-06-04 | Medium loading adjustable filter with bimetal diaphragm structure |
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| CN202010501787.5A Pending CN111613860A (en) | 2020-06-04 | 2020-06-04 | Medium loading adjustable filter with bimetal diaphragm structure |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201859933U (en) * | 2010-11-12 | 2011-06-08 | 北京遥测技术研究所 | Ka-band E-surface longitudinal diaphragm loading waveguide filter |
| CN105161807A (en) * | 2015-09-21 | 2015-12-16 | 电子科技大学 | Tunable terahertz waveguide filter based on bimorph thermal actuator |
| JP6508749B1 (en) * | 2018-01-22 | 2019-05-08 | Ｎｅｃプラットフォームズ株式会社 | Bandwidth variable band pass filter |
| US20190198958A1 (en) * | 2017-12-21 | 2019-06-27 | Gowrish Basavarajappa | Tunable bandpass filter with constant absolute bandwidth using single tuning element |
| CN110459844A (en) * | 2019-08-30 | 2019-11-15 | 成都天奥电子股份有限公司 | A kind of adjustable waveguide filter of face H medium |
-
2020
- 2020-06-04 CN CN202010501787.5A patent/CN111613860A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201859933U (en) * | 2010-11-12 | 2011-06-08 | 北京遥测技术研究所 | Ka-band E-surface longitudinal diaphragm loading waveguide filter |
| CN105161807A (en) * | 2015-09-21 | 2015-12-16 | 电子科技大学 | Tunable terahertz waveguide filter based on bimorph thermal actuator |
| US20190198958A1 (en) * | 2017-12-21 | 2019-06-27 | Gowrish Basavarajappa | Tunable bandpass filter with constant absolute bandwidth using single tuning element |
| JP6508749B1 (en) * | 2018-01-22 | 2019-05-08 | Ｎｅｃプラットフォームズ株式会社 | Bandwidth variable band pass filter |
| CN110459844A (en) * | 2019-08-30 | 2019-11-15 | 成都天奥电子股份有限公司 | A kind of adjustable waveguide filter of face H medium |
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