CN105356022B - A kind of tunable filter for introducing groove and removable metal column - Google Patents
A kind of tunable filter for introducing groove and removable metal column Download PDFInfo
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- CN105356022B CN105356022B CN201510789330.8A CN201510789330A CN105356022B CN 105356022 B CN105356022 B CN 105356022B CN 201510789330 A CN201510789330 A CN 201510789330A CN 105356022 B CN105356022 B CN 105356022B
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- metal column
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Abstract
The invention discloses a kind of tunable filters for introducing groove and removable metal column, including cavity, at least two tuning screws and at least two T-shaped structures, each T-shaped structure is connected by rectangular metal body with metal column to be formed, the rectangular metal body is arranged in the top outside of cavity, and the metal column is located at the lower section of rectangular metal body；Each tuning screw corresponds to a T-shaped structure, is connect after passing through rectangular metal body and metal column with the metal dish of a setting in the cavity；The top of the cavity is equipped at least two flutings, and each fluting corresponds to a T-shaped structure, and with the space that can make a metal column movement；The bottom of the cavity is equipped at least two grooves, and each groove corresponds to a T-shaped structure.The tunable filter of the present invention can greatly increase the variable range of screw tuned frequency, can be widely applied in the wireless communication system of numerous different frequency ranges.
Description
Technical field
It is especially a kind of to introduce the adjustable of groove and removable metal column the present invention relates to a kind of a wide range of tunable filter
Wave filter belongs to wireless communication field.
Background technology
Recent communication system and the communication technology have obtained development at full speed, and frequency spectrum resource is also consumed rapidly utilization, frequency band
Become more and more crowded.Wave filter as important microwave radio element, performance affect the quality of entire communication system.
In order to meet the demand of the multiband of communication system, there is the adjustable wave filter of frequency.
The great advantage of tunable filter is exactly that the centre frequency of its passband moves, and can meet numerous frequency selections
Demand.Tunable filter is broadly divided into two major class of circuit tuning and mechanical tuning.Electricity tunes up is used in planar junction more
On the wave filter of structure, and to be used in cavity body structure in the majority for mechanical adjustable.The tunable filter of planar structure has simple in structure, manufacture
It is at low cost, easily with other circuits cascadings, it is small the advantages that, but the shortcomings of also lossy big and power capacity is small.Machinery can
The power capacity of the cavity body filter of tune is big, and is lost small, but volume is heavy, hardly possible processing, with other circuits cascadings difficulty.
Planar structure tunable filter is mostly used in the communication system of miniaturization, and cavity body filter is mostly used have high-power need in base station etc.
In the communication system asked.
At present, the adjustable extent of mechanical adjustable wave filter is little, in order to meet the selection demand of more multiband, needs frequency
The wave filter of rate adjustable extent bigger occurs.This patent is on the basis of conventional coaxial chamber, realizes wide range of frequencies adjustment
Improved structure, possessing has huge raising with cavity body filter the advantages of identical and in adjustable frequency range.
According to investigations with understanding, disclosed prior art is as follows：
1) Fig. 1 a~1b are the traditional model of mechanical adjustable wave filter, are round metals in the resonator of metal in surrounding
Column resonator and metal disk (can also be other shapes, such as irregular shape that is rectangular, oval or having corner cut) be connected,
Top is that a tuning screw passes through the metal outer wall of top to lead to inside cavity, and the adjustable principle of frequency is to change screw and gold
Belong to the distance of disk to change capacitance, so as to change the resonant frequency of resonator.
2) Fig. 2 a~2b change also with principle similar Fig. 1 a~1b also with the method for capacitance is changed
Resonant frequency, metal sleeve are connected with tuning screw, can change the position of sleeve with used screw, and then change sleeve away from gold
Belong to the distance of wall, according to capacitance equation C=ε S/4 π kd, capacitance is inversely proportional according to sleeve and the direct distance of metallic walls, so
The capacitance of resonator is to become larger, and resonant frequency becomes smaller accordingly.
Invention content
The purpose of the present invention is to solve the defects of the above-mentioned prior art, provide a kind of introducing groove and removable gold
Belong to the tunable filter of column, which can greatly increase the variable range of screw tuned frequency, being capable of extensive use
Into the wireless communication system of numerous different frequency ranges.
The purpose of the present invention can be reached by adopting the following technical scheme that：
A kind of tunable filter for introducing groove and removable metal column, including cavity, at least two tuning screws and
At least two T-shaped structures, each T-shaped structure are connected with metal column by rectangular metal body and formed, and the rectangular metal body is arranged on
In the top outside of cavity, the metal column is located at the lower section of rectangular metal body；Each tuning screw corresponds to a T shape knot
Structure is connect after passing through rectangular metal body and metal column with the metal dish of a setting in the cavity；The top of the cavity is equipped with
At least two flutings, each corresponding T-shaped structure of fluting, and with the space that can make a metal column movement；The cavity
Bottom be equipped at least two grooves, each groove corresponds to a T-shaped structure.
As a kind of embodiment, the left side of the cavity is equipped with the first input/output end port, and the right side of cavity is equipped with the
Two input/output end ports are equipped with the first coaxial outer conductor and the first coaxial inner conductor, institute at first input/output end port
It states the first coaxial inner conductor to put in cavity from the first input/output end port, the inside top face after 90 degree of bendings with cavity
Connection；The second coaxial outer conductor and the second coaxial inner conductor are equipped at second input/output end port, described second is coaxial interior
Conductor is put in from the second input/output end port in cavity, is connect after 90 degree of bendings with the inside top face of cavity.
As a kind of embodiment, at least two T-shaped structure is set gradually from left to right on cavity, wherein the left side
First T-shaped structure and first, the right T-shaped structure are symmetrical；First coaxial inner conductor is divided into horizontal segment and is erected after bending
Straight section, the vertical section of the first coaxial inner conductor are located at below the rectangular metal body of first left T-shaped structure, and close to the T shapes
The metal column of structure；Second coaxial inner conductor is divided into horizontal segment and vertical section after bending, and the second coaxial inner conductor erects
Straight section is located at below the rectangular metal body of first, the right T-shaped structure, and close to the metal column of the T-shaped structure.
As a kind of embodiment, first coaxial outer conductor and the second coaxial outer conductor use sub-miniature A connector.
As a kind of embodiment, the cavity is rectangular cavity.
As a kind of embodiment, the shape of the metal dish is round, rectangular, oval or irregular with corner cut
Shape.
As a kind of embodiment, the shape of the groove is cylinder, cuboid or Elliptic Cylinder.
The present invention has following advantageous effect relative to the prior art：
1st, tunable filter of the invention introduces groove in cavity bottom, using tuning screw change metal dish to groove it
Between distance control capacitance, to introduce groove can increase frequency adjustable extent, and can cause adjustable frequency range line
Property；Meanwhile using fluting the metal column of T-shaped structure is moved at the top of cavity, carry out control model in this way
Coupling between (TM moulds) so that can preferably form passband matching in frequency adjustable extent.
2nd, tunable filter of the invention may be designed to double rank tunable filters, three rank tunable filters or even three ranks with
On N rank tunable filters, in three rank tunable filters, in moving left and right and utilize using the metal column of the right and left
Between metal column be moved forward and backward (totally three removable dimensions) to control coupling between three patterns and passband matching；In N ranks
In tunable filter, move up and down to change metal column height, and then change frequency by tuning screw, pass through the fluting at top
Can make metal column all around move (metal column of the right and left can only move left and right, N-2 intermediate metal column cooperation,
Can all around move) control the coupling between multiple patterns, non-inductive windings control coupling is realized between metal column.
3rd, tunable filter of the invention is stretched using input/output end port of two coaxial inner conductors at left and right sides of cavity
It into cavity, is connect respectively with the inside top face of cavity after 90 degree of bendings, to realize feed, 90 degree of meander feed structures
It is matched with removable metal column, it can be achieved that coupled outside and Mode Coupling double control.
4th, the present invention obtains linear wide range of frequencies tunable characteristic using the mode of mobile metal column and introducing groove, may be used also
To be applied in N ranks or more metal resonant column wave filters.
Description of the drawings
Fig. 1 a are the mechanical adjustable wave filter stereogram of the first prior art.
Fig. 1 b are the mechanical adjustable wave filter front view of the first prior art.
Fig. 2 a are the mechanical adjustable wave filter stereogram of second of prior art.
Fig. 2 b are the mechanical adjustable wave filter front view of second of prior art.
Fig. 3 is the tunable filter stereogram of the embodiment of the present invention 1.
Fig. 4 is the tunable filter front view of the embodiment of the present invention 1.
Fig. 5 is the tunable filter vertical view of the embodiment of the present invention 1.
Fig. 6 is the tunable filter left view of the embodiment of the present invention 1.
Fig. 7 is the tunable filter stereogram of the embodiment of the present invention 2.
Fig. 8 is the tunable filter stereogram of the embodiment of the present invention 3.
Wherein, 1- cavitys, the first tuning screws of 2-, 3- second tune screws, 4- the first rectangular metal bodies, the first metals of 5-
Column, 6- the second rectangular metal bodies, the second metal columns of 7-, 8- first slot, and 9- second slots, the first grooves of 10-, and 11- second is recessed
Slot, the first coaxial outer conductors of 12-, the first coaxial inner conductors of 13-, the second coaxial outer conductors of 14-, the second coaxial inner conductors of 15-,
The first metal dish of 16-, the second metal dish of 17-.
Specific embodiment
Embodiment 1：
As shown in Fig. 3~Fig. 6, the tunable filter of the present embodiment is double rank tunable filters, is adjusted including cavity 1, first
Humorous screw 2, second tune screw 3, the first T-shaped structure and the second T-shaped structure；
First T-shaped structure and the second T-shaped structure are symmetricly set on the right and left of cavity 1, constitute bimodulus resonance
Device, first T-shaped structure are made of the first rectangular metal body 4 and the connection of the first metal column 5, and second T-shaped structure is by the
Two rectangular metal bodies 6 and the second metal column 7 connection composition, the first rectangular metal body 4 and the second rectangular metal body 6 are respectively provided with
In the top outside of cavity 1, first metal column 5 is located at 4 lower section of the first rectangular metal body, and the second metal column 7 is located at
Second rectangular metal body, 6 lower section；
The cavity 1 is rectangular cavity, and top is equipped with the first fluting 8 and the second fluting 9, bottom are equipped with 10 He of the first groove
Second groove 11, left side are equipped with the first input/output end port (not shown), and right side is equipped with the second input/output end port (figure
In be not shown), 10 and second groove 11 of the first groove is cylinder；It is described first fluting 8 have can make the first metal
The space that column 5 moves left and right, it is described second fluting 9 have can make the space that the second metal column 7 moves left and right；Described first is defeated
Enter/output port at be equipped with the first coaxial outer conductor 12 and the first coaxial inner conductor 13, first coaxial inner conductor 13 is from the
One input/output end port is put in cavity 1, is connect after 90 degree of bendings with the inside top face of cavity 1, to realize feed；Institute
State and the second coaxial outer conductor 14 and the second coaxial inner conductor 15 be equipped at the second input/output end port, described second it is coaxial in lead
Body 15 is put in from the second input/output end port in cavity 1, is connect after 90 degree of bendings with the inside top face of cavity 1, to realize
Feed；First groove 10 corresponds to the first T-shaped structure, and second groove 11 corresponds to the second T-shaped structure；
First coaxial outer conductor, 12 and second coaxial outer conductor 14 uses SMA heads；First coaxial inner conductor
13 are divided into horizontal segment and vertical section after bending, and the vertical section of the first coaxial inner conductor 13 is located at 4 lower section of the first rectangular metal body,
And close to the first metal column 5；Second coaxial inner conductor 15 is divided into horizontal segment and vertical section after bending, second it is coaxial in lead
The vertical section of body 15 is located at 6 lower section of the second rectangular metal body, and close to the second metal column 7；
First tuning screw 2 corresponds to the first T-shaped structure, after passing through the first rectangular metal body 4 and the first metal column 5
It is connect with the first metal dish 16 being arranged in cavity 1, the second tune screw 3 corresponds to the second T-shaped structure, passes through second
It is connect after 6 and second metal column 7 of rectangular metal body with the second metal dish 17 being arranged in cavity 1, first metal dish 16
Shape with the second metal dish 17 is circle.
The adjustable principle of frequency of double rank tunable filters of the present embodiment is：Utilize tuning screw (the first tuning screw 2
With second tune screw 3) metal dish (the first metal dish 16 and the second metal dish 17) is adjusted to groove (the first groove 10 and second
The distance between groove 11), to control capacitance, frequency adjustable extent can be increased, and can be so that adjustable by introducing groove
Frequency range is linear；Meanwhile cause metal column (first using fluting (the first fluting 8 and the second fluting 9) at the top of cavity 1
Metal column 5 and second metal column 7) (i.e. resonator can move left and right) can be moved left and right, control two moulds in this way
Coupling between formula so that can preferably form passband matching in frequency adjustable extent；Wherein, two patterns refer to that TM is strange
Mould and TM idol moulds.
The process of double rank tunable filters of the present embodiment is as follows：
1) as shown in fig. 6, making a line segment AA ' by the first input/output end port center, cavity is cut along line segment AA '
1, it is divided into upper cavity and lower chamber；In lower chamber, the groove of certain depth is processed, and symmetrical in symmetrical both sides bottom surface
Two sides process the half of groove and mounting hole of SMA；In upper cavity, in symmetrical two sides, processing SMA is another
Outer one side of something groove and mounting hole, the first input/output end port and the second input/output end port are respectively installed to by two SMA,
Two moveable symmetrical flutings are processed at the top of upper cavity；
2) metal column in T-type structure processes screw thread corresponding with tuning screw, and two T-type structures are respectively embedded in
In two flutings, two tuning screws are each passed through two metal columns, and two metal dish are welded in two tuning screws respectively
End, two coaxial inner conductors through 90 degree of bendings, the both ends of one of coaxial inner conductor are welded in the first input/output respectively
On SMA heads at port and the inside top face of upper cavity, the both ends of another coaxial inner conductor are welded in the second input/defeated respectively
On SMA heads at the exit port and inside top face of upper cavity.
3) the good upper cavity of process and assemble and lower chamber merge at cutting line, and are fixed entire cavity with screw
It is good, finally tested.
Embodiment 2：
As shown in fig. 7, the present embodiment tunable filter is three rank tunable filters, on the basis of double rank tunable filters
On, a T-shaped structure is further added by between two T-shaped structures, forms three mould resonators, between two flutings at the top of cavity
Be further added by one fluting, be further added by a groove between two grooves of cavity bottom, institute it is increased fluting make centre T shapes
The metal column of structure can be moved forward and backward, and altogether there are three removable dimension, three metal columns are utilized in three rank tunable filters
It all around moves to control coupling and the passband matching between three patterns；Wherein, three patterns refer to three magnetic directions
Different TM moulds.
Embodiment 3：
As shown in figure 8, the present embodiment tunable filter is N (N is more than three) rank tunable filter, in double rank tunable filters
On the basis of, multiple T-shaped structures are further added by between two T-shaped structures, form multimode resonator, two at the top of cavity are opened
Multiple flutings are further added by between slot, multiple grooves are further added by between two grooves of cavity bottom, similary there are three removable
The metal column of the T-shaped structure of dimension, wherein the right and left can only move left and right, and the metal column of N-2 intermediate T-shaped structure is matched
It closes, can all around move；It is moved up and down by tuning screw and (changes metal dish to cavity bottom to change metal column height
The distance of groove), and then change frequency, metal column can be made all around to move to control multiple patterns by the fluting at top
Between coupling.
In above-described embodiment 1~3, the shape of the metal dish can also be rectangular, oval or not advising with corner cut
Then shape；The shape of the groove can also be cuboid or Elliptic Cylinder；The cavity, T-shaped structure, coaxial outer conductor and same
The metal material that axis inner wire uses can for aluminium, iron, tin, copper, silver, gold and platinum any one or can be aluminium, iron, tin,
Copper, silver, gold and the platinum alloy of any one.
In conclusion the tunable filter of the present invention introduces groove in cavity bottom, change metal dish using tuning screw
Capacitance is controlled to the distance between groove, frequency adjustable extent can be increased, and can cause adjustable frequency by introducing groove
Rate range is linear；Meanwhile using fluting the metal column of T-shaped structure is moved at the top of cavity, come in this way
Coupling between control model so that can preferably form passband matching in frequency adjustable extent.
The above, patent preferred embodiment only of the present invention, but the protection domain of patent of the present invention is not limited to
This, any one skilled in the art is in the range disclosed in patent of the present invention, according to the skill of patent of the present invention
Art scheme and its inventive concept are subject to equivalent substitution or change, belong to the protection domain of patent of the present invention.
Claims (7)
1. a kind of tunable filter for introducing groove and removable metal column, it is characterised in that：Including cavity, at least two tunings
Screw and at least two T-shaped structures, each T-shaped structure are connected with metal column by rectangular metal body and formed, the rectangular metal
Body is arranged in the top outside of cavity, and the metal column is located at the lower section of rectangular metal body；Each tuning screw corresponds to one
A T-shaped structure is connect after passing through rectangular metal body and metal column with the metal dish of a setting in the cavity；The top of the cavity
Portion is equipped at least two flutings, and each fluting corresponds to a T-shaped structure, and with the space that can make a metal column movement；Institute
The bottom for stating cavity is equipped at least two grooves, and each groove corresponds to a T-shaped structure.
2. a kind of tunable filter for introducing groove and removable metal column according to claim 1, it is characterised in that：Institute
The left side for stating cavity is equipped with the first input/output end port, and the right side of cavity is equipped with the second input/output end port, and described first is defeated
Enter/output port at be equipped with the first coaxial outer conductor and the first coaxial inner conductor, first coaxial inner conductor from first input/
Output port is put in cavity, is connect after 90 degree of bendings with the inside top face of cavity；At second input/output end port
Equipped with the second coaxial outer conductor and the second coaxial inner conductor, second coaxial inner conductor is put in from the second input/output end port
In cavity, it is connect after 90 degree of bendings with the inside top face of cavity.
3. a kind of tunable filter for introducing groove and removable metal column according to claim 2, it is characterised in that：Institute
It states at least two T-shaped structures to be set gradually from left to right on cavity, wherein first left T-shaped structure and first, the right T
Shape symmetrical configuration；First coaxial inner conductor is divided into horizontal segment and vertical section after bending, the first coaxial inner conductor it is vertical
Section is located at below the rectangular metal body of first left T-shaped structure, and close to the metal column of the T-shaped structure；Described second is coaxial
Inner wire is divided into horizontal segment and vertical section after bending, and the vertical section of the second coaxial inner conductor is located at first, the right T-shaped structure
Rectangular metal body below, and close to the T-shaped structure metal column.
4. the tunable filter of a kind of introducing groove and removable metal column according to Claims 2 or 3, feature exist
In：First coaxial outer conductor and the second coaxial outer conductor use sub-miniature A connector.
It is 5. special according to a kind of tunable filter for introducing groove and removable metal column of claim 1-3 any one of them
Sign is：The cavity is rectangular cavity.
It is 6. special according to a kind of tunable filter for introducing groove and removable metal column of claim 1-3 any one of them
Sign is：The shape of the metal dish is irregular shape round, rectangular, oval or with corner cut.
It is 7. special according to a kind of tunable filter for introducing groove and removable metal column of claim 1-3 any one of them
Sign is：The shape of the groove is cylinder, cuboid or Elliptic Cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510789330.8A CN105356022B (en) | 2015-11-17 | 2015-11-17 | A kind of tunable filter for introducing groove and removable metal column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510789330.8A CN105356022B (en) | 2015-11-17 | 2015-11-17 | A kind of tunable filter for introducing groove and removable metal column |
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| Publication Number | Publication Date |
|---|---|
| CN105356022A CN105356022A (en) | 2016-02-24 |
| CN105356022B true CN105356022B (en) | 2018-06-29 |
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| CN201510789330.8A Expired - Fee Related CN105356022B (en) | 2015-11-17 | 2015-11-17 | A kind of tunable filter for introducing groove and removable metal column |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105870550B (en) * | 2016-04-22 | 2019-02-22 | 厦门松元电子有限公司 | A kind of split type filter of filter with low insertion loss |
| CN106486726B (en) * | 2016-08-03 | 2019-08-20 | 华南理工大学 | The Metal cavity filter of embedded H-type metal strip |
| CN112073022B (en) * | 2020-08-18 | 2023-10-13 | 安徽蓝麦通信股份有限公司 | Band-pass filter |
| CN114792873B (en) * | 2022-04-11 | 2023-11-28 | 陕西索飞电子科技有限公司 | Resonator, frequency selection method, filter and filter combination |
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| US4639699A (en) * | 1982-10-01 | 1987-01-27 | Murata Manufacturing Co., Ltd. | Dielectric resonator comprising a resonant dielectric pillar mounted in a conductively coated dielectric case |
| CN201562744U (en) * | 2009-05-19 | 2010-08-25 | 武汉凡谷电子技术股份有限公司 | Adjustable filter |
| CN205159478U (en) * | 2015-11-17 | 2016-04-13 | 华南理工大学 | Introduce tunable filter of recess and portable metal column |
-
2015
- 2015-11-17 CN CN201510789330.8A patent/CN105356022B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4639699A (en) * | 1982-10-01 | 1987-01-27 | Murata Manufacturing Co., Ltd. | Dielectric resonator comprising a resonant dielectric pillar mounted in a conductively coated dielectric case |
| CN201562744U (en) * | 2009-05-19 | 2010-08-25 | 武汉凡谷电子技术股份有限公司 | Adjustable filter |
| CN205159478U (en) * | 2015-11-17 | 2016-04-13 | 华南理工大学 | Introduce tunable filter of recess and portable metal column |
Non-Patent Citations (1)
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| 《Fast and Accurate CAD Tool of Passive Rectangular Waveguide Devices including Cylindrical Conducting Posts》;F.Mira等;《2005 European Microwave Conference》;20051006;全文 * |
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