CN105449324B - A kind of coaxial electrically tunable filter of multi-cavity - Google Patents
A kind of coaxial electrically tunable filter of multi-cavity Download PDFInfo
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- CN105449324B CN105449324B CN201511025463.4A CN201511025463A CN105449324B CN 105449324 B CN105449324 B CN 105449324B CN 201511025463 A CN201511025463 A CN 201511025463A CN 105449324 B CN105449324 B CN 105449324B
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- cavity
- filter
- inner wire
- electrically tunable
- tunable filter
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
- H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other
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- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a kind of coaxial electrically tunable filters of multi-cavity, the linear motor controlled by driving circuit including transmission mechanism, filter and one, linear motor includes a driving screw rod and a driving nut, one end of screw rod is driven to be stretched out from the inside of the linear motor, the other end is fixed on by driving nut on guide plate.Filter includes structure identical first to N resonant cavities, N >=2.Inner wire and tuning plug are equipped in the box body of first resonant cavity, tuning plug one end is flexibly connected with guide plate, and the other end stretches into the inner wire of the first resonant cavity, and built-in length is adjustable.Inner wire is equipped with elastic connecting device, O-ring and the sleeve that nesting is installed from inside to outside successively, and elastic connecting device is row's circular protrusions on the inside of the broach of circular metal cylinder port, and tuning plug is electrically connected with circular protrusions.The present invention improves filter stability, optimizes the stopband characteristic of radio-frequency filter, improves the belt resistance inhibitor system of cavity body filter, improves the anti-interference ability of communication equipment.
Description
Technical field
The present invention relates to a kind of electrically tunable filter, especially a kind of coaxial electrically tunable filter of multi-cavity belongs to microwave filter
Technical field.
Background technology
The Chinese utility model patent of Patent No. CN201220549062.4 discloses a kind of " UHF waves in the prior art
The Chinese utility model patent of section miniaturized electric regulating duplexer ", Patent No. CN201420768754.7 discloses a kind of " wide tune
The stepper motor of humorous coaxial electrically tunable filter ", use is reaction equation or composite stepper motor respectively, and motor makes with transmission mechanism
With gear drive either shaft coupling be attached, not only processing and assembly difficulty it is big, volume is relatively large, transmission accuracy also by
It is reduced in gear clearance or shaft coupling assembly precision.Higher in operating frequency requirements, frequency positioning accuracy cannot
Meet demand.
Conventionally, as design difficulty is big, what coaxial electrically tunable filter used is all the bandpass filter of four chambers.
In order to obtain the filtering performance of multi-cavity bandpass filter, two four chamber electrically adjusted band-pass filters of generally use are cascaded, still
This way sacrificed volume and exchange anti-interference ability for, stopband characteristic superposition efficiency is low, and differential loss is big, in the equipment requirement of miniaturization
Under, have been unable to meet requirement.
In addition, transmission mechanism in the prior art is directly connected to using guide plate with guide rod, in heavier loads, it is oriented to effect
Fruit is bad.In the case of especially multiple resonant cavities link simultaneously, transmission mechanism entirety rigging error makes the transmission of filter not
It is smooth, the load capacity of motor is required to improve.Original inner wire top of coaxial cavity electrically tunable filter is interdigitated electrode structure shrapnel,
The forming processes production cycle of metal material is longer, and yield rate is low.
Invention content
For deficiency in the prior art, the present invention provides a kind of coaxial electrically tunable filters of multi-cavity.
In order to solve the above technical problems, the technical solution used in the present invention is：
A kind of coaxial electrically tunable filter of multi-cavity, including driving circuit, transmission mechanism, filter, two radio frequency interfaces；It is described
Driving circuit is mounted on the outer wall of transmission mechanism；The transmission mechanism includes that part, guide plate and more than one guide rod is made；
Each guide rod is mutually parallel, and is connect with guide plate；The filter includes structure identical first to N resonant cavities, and N >=
2；First resonant cavity includes box body and cover board；Inner wire and tuning plug are equipped in the box body of first resonant cavity, it is described
Tuning plug and inner wire electrical contact, one end are flexibly connected with guide plate, and the other end stretches into the interior of first resonant cavity and leads
Body is electrically connected with the inner wire of first resonant cavity；The tuning plug stretches into the length of the inner wire of first resonant cavity 6
It is adjustable；The radio frequency interface be separately positioned on first and N resonant cavities outer wall on, for inputting, exporting radiofrequency signal；It is special
Sign is：Further include a linear motor controlled by driving circuit, the linear motor includes a driving screw rod and one
Nut, one end of the driving screw rod is driven to stretch out, be fixed on by the driving nut described from the inside of the linear motor 2
On guide plate；The driving screw rod is parallel with each guide rod；Each box body is integrated with the support section of transmission mechanism 3 to be added
Work.
The driving screw rod and driving nut vertical connection；The driving nut is connect with guide plate plane；Each tune
Humorous bar is symmetrically arranged centered on driving nut.It is beneficial to filter stable movement in this way.It is convenient to lower trial product in small space.
Each guide rod is flexibly connected by linear bearing with guide plate.
The inner wire is equipped with O-ring, sleeve and elastic connecting device, and the O-ring is sleeved on elastic connecting device
Outside, the sleeve are mounted on outside O-ring；The elastic connecting device is the row circle on the inside of the broach of circular metal cylinder port
Shape protrusion, is uniformly distributed；The tuning plug 9 is electrically connected with the circular protrusions of the elastic connecting device.
The coaxial electrically tunable filter of multi-cavity includes six resonant cavities；Described first shares one to third resonant cavity covers
Plate, the 4th to the 6th resonant cavity share a cover board.
The coaxial electrically tunable filter of multi-cavity further include from ring radio frequency interface, be mounted on first or the 6th resonant cavity cover board
On.
It is straight barrel type outside the linear bearing.
The tuning plug top is equipped with cross deep trouth.
Dustproof encloser is equipped with outside the transmission mechanism.
The resonant cavity of the coaxial electrically tunable filter of multi-cavity is metal constructed of aluminium, and inner wire is beryllium-bronze material.
Nut is driven to use model engineering plastic.
By adopting the above-described technical solution, the beneficial effects of the present invention are：
1. present invention employs efficient linear motor, the rotary motion inside motor is changed into linear movement, letter
Change design, improves the processing and manufacturing efficiency and assembly precision of electrically tunable filter.
2. in the transmission mechanism of the present invention, being coordinated using the linear bearing and guide rod of good guidance, realizing electrically regulated filtering
The Linear transmission of device can reach high speed, stable movement effects, overcome overload, cunning caused by tuning plug build-up tolerance
It is dynamic to be obstructed, be driven problem unsmooth, that performance of filter is impacted.
3. the linear motor in the present invention carries the driving nut of the driving screw rod and model engineering plastic of stainless steel, friction
Power is small, non-maintaining, with high durability, and further improve electrically tunable filter changes frequency precision, frequency repeatability and production
Product reliability.
4. the filter of the present invention is connected in series with using six resonant cavities, overall structure is arranged at multiple rows of multi-column version, real
Existing structure minimizes, and not only passband differential loss is small, and degree of suppression is also greatly improved, and increases the frequency of use of system, improves anti-interference energy
Power, equipment performance are optimized.
5. the attachment device that the inner wire of the intra resonant cavity of the present invention uses is circular metal cylinder, has one on the inside of port
Circular protrusions are arranged, is uniformly distributed, is well contacted with tuning plug, and are coordinated using O-ring and sleeve, performance of filter is improved
Stability.
6. processing cross deep trouth at the top of the tuning plug of the present invention, convenient to debug from different perspectives, linear bearing is selected straight
Cartridge type saves space, volume minimization than flange disk-form.
Description of the drawings
Fig. 1 is the front view of the present invention；
Fig. 2 is left view sectional view of the present invention；
Fig. 3 is the inner conductor structure schematic diagram of the present invention；
Wherein 1- driving circuits, 2- linear motors, 3- transmission mechanisms, 4- filters, 5- radio frequency interfaces, the first resonance of 6-
Chamber, 7- linear motors driving screw rod, 8- linear motors driving nut, 9- tuning plugs, 10- guide plates, 11- linear bearings, 12- are led
Bar, 13- inner wires, 14-O type circles, 15- sleeves, 16- elastic connecting devices.
Specific implementation mode
The present invention is described in further details below in conjunction with the accompanying drawings：
As shown in Figure 1-Figure 3, the coaxial electrically tunable filter of a kind of multi-cavity, including driving circuit 1, transmission mechanism 3, filter 4,
Two radio frequency interfaces 5；The driving circuit 1 is mounted on the outer wall of transmission mechanism 3；The transmission mechanism 3 include be made part,
Guide plate 10 and more than one guide rod 12；Each guide rod 12 is mutually parallel, and is connect with guide plate 9；The filter 4 includes
Structure identical first is to N resonant cavities, N >=2；First resonant cavity 6 includes box body and cover board；First resonant cavity 6
Inner wire 13 and tuning plug 9 are equipped in box body, the tuning plug 9 and inner wire 13 are in electrical contact, one end and 10 activity of guide plate
Connection, the other end stretch into the inner wire 13 of first resonant cavity 6, are electrically connected with the inner wire 13 of first resonant cavity 6；
The length that the tuning plug 9 stretches into the inner wire 13 of first resonant cavity 6 is adjustable；The radio frequency interface is separately positioned on first
On the outer wall of N resonant cavities, for inputting, exporting radiofrequency signal；It is characterized in that：Further include one to be controlled by driving circuit 1
The linear motor 2 of system, the linear motor 2 includes a driving screw rod 7 and one drives nut 8, described to drive the one of screw rod 7
End is stretched out from the inside of the linear motor 2, is fixed on the guide plate 10 by the driving nut 8；The driving screw rod 7
It is parallel with each guide rod；Each box body processing integrated with the support section of transmission mechanism 3.
The driving screw rod 7 and driving 8 vertical connection of nut；The driving nut 8 is connect with 10 plane of guide plate；It is described
Each tuning plug 9 is symmetrically arranged centered on driving nut 8.It is beneficial to filter stable movement in this way.It is convenient to be lowered in small space
Trial product.
Each guide rod 12 is flexibly connected by linear bearing 11 with guide plate 10.
The inner wire 13 is equipped with O-ring 14, sleeve 15 and elastic connecting device 16, and the O-ring 14 is sleeved on bullet
Property the outside of attachment device 16, the sleeve 15 is mounted on 14 outside of O-ring；The elastic connecting device 16 is circular metal cylinder end
Row's circular protrusions on the inside of mouth broach, are uniformly distributed；The circular protrusions electricity of the tuning plug 9 and the elastic connecting device 16
Connection.
The coaxial electrically tunable filter of multi-cavity includes six resonant cavities；Described first shares one to third resonant cavity covers
Plate, the 4th to the 6th resonant cavity share a cover board.
The coaxial electrically tunable filter of multi-cavity further include from ring radio frequency interface, be mounted on first or the 6th resonant cavity cover board
On.
It is straight barrel type outside the linear bearing 11.
9 top of the tuning plug is equipped with cross deep trouth.
3 outside of the transmission mechanism is equipped with dustproof encloser.
The resonant cavity of the coaxial electrically tunable filter of multi-cavity is metal constructed of aluminium, and inner wire 13 is beryllium-bronze material.
Drive nut 8 that model engineering plastic, wear resistant corrosion resistant is used to be not necessarily to later maintenance.
In the present embodiment, driving circuit 1 and linear motor 2 have connecting line, driving circuit 1 to use conventional technical means, pass
Motivation structure 3 includes the identical guide rod of two structures, and filter uses the concatenated form grade of resonant cavity of quarter-wave resonance
Connection completes the function of six chamber coaxial band-pass filters.Using the electrically tunable filter resonance manner of such six chamber, improve equipment and
The performance of system.Transmission mechanism 3 is connected using linear motor mode, simplifies assembly relation, has been also convenient for later product debugging.
As shown in Fig. 2, first dress refills guide rod 12, more favorably there are two linear bearing 11 in linear bearing 11 on guide plate 9
When the multiple resonant cavities of electrically tunable filter synchronize and change frequency, smooth, fluent, stable filter performance is moved.
As shown in figure 3, the inner wire 13 in each resonant cavity is the hollow circular-tube of beryllium-bronze material integration turner forming,
The elastic connecting device 16 for having row's circular protrusions on the inside of port, more reliably can well contact with tuning plug 9,14 sets of O-ring
In the outside recess of elastic connecting device 16, sleeve 15 is close to O-ring 14 and is mounted on 16 outermost of elastic connecting device, plays
Effect of contraction increases the stability and reliability of filter.There are multiple threaded holes at the back side of the coaxial electrically tunable filter of multi-cavity, convenient
Ground is installed in communication equipment.
This application that linear transformation is realized inside motor, greatly simplifies design so that in electrically tunable filter
Linear motor can be directly used to carry out accurate linear movement in the case where not installing external mechanical linkage, and also
Improve the processing and manufacturing efficiency and assembly precision of electrically tunable filter.Meanwhile linear motor carry stainless steel driving screw rod and
The driving nut of model engineering plastic, frictional force is small, non-maintaining, with high durability, therefore further improves electric tune
Filter changes frequency precision, frequency repeatability and product reliability.
The inner wire of intra resonant cavity of the present invention uses novel elastic attachment device, is circular metal cylinder, port inside
There are row's circular protrusions, be uniformly distributed, well contacted with tuning plug, and coordinated using O-ring and sleeve, more improves filtering
The stability of device performance.And in traditional design, the elastic comb on inner wire top is people after end face of cylinder Direct Uniform grooving
Work closes up, and heat treatment shaping, the contact with tuning plug is that the line at edge contacts, and is used for a long time, and broach has tuning plug surface
Larger scuffing destroys conductive coating.
The present invention using high-precision, high efficiency, structure simplify linear motor do power drive, using can high speed, steadily
Linear transmission is realized in linear bearing and the guide rod cooperation of movement, and filter is there are two above prevention at radio-frequency port and multiple is connected in series with
Resonant cavity, inner wire use reliability in the resonant cavity high smaller point contact structure of frictional force realize more good penetrate
Frequency short circuit, improves filter amplitude-frequency stability.Electrically tunable filter provided by the invention not only has in wider tuning range
There is stable passband amplitude versus frequency characte, also optimize the stopband characteristic of radio-frequency filter, improves the belt resistance inhibitor system of cavity body filter,
Improve the anti-interference ability of communication equipment.
Claims (9)
1. a kind of coaxial electrically tunable filter of multi-cavity, including driving circuit (1), transmission mechanism (3), filter (4), two radio frequencies connect
Mouth (5)；The driving circuit (1) is mounted on the outer wall of transmission mechanism (3)；The transmission mechanism (3) includes guide plate (10)
With more than one guide rod (12)；Each guide rod (12) is mutually parallel, and is connect with guide plate (10)；Filter (4) packet
Structure identical first is included to N resonant cavities, N >=2；First resonant cavity (6) includes box body and cover board；First resonance
Inner wire (13) and tuning plug (9), the tuning plug (9) and inner wire (13) electrical contact, one end are equipped in the box body of chamber (6)
It is flexibly connected with guide plate (10), the other end stretches into the inner wire (13) of first resonant cavity (6), with first resonance
The inner wire (13) of chamber (6) is electrically connected；The tuning plug (9) stretches into the length of the inner wire (13) of first resonant cavity (6)
It is adjustable；The radio frequency interface be separately positioned on first and N resonant cavities outer wall on, for inputting, exporting radiofrequency signal；It is special
Sign is：Further include a linear motor (2) controlled by driving circuit (1), the linear motor (2) includes a driving spiral shell
Bar (7) and a driving nut (8), one end of the driving screw rod (7) is stretched out from the inside of the linear motor (2), by institute
Driving nut (8) is stated to be fixed on the guide plate (10)；The driving screw rod (7) is parallel with each guide rod；Each box
Body processing integrated with the support section of transmission mechanism (3)；
The inner wire (13) is equipped with O-ring (14), sleeve (15) and elastic connecting device (16), O-ring (14) set
Outside elastic connecting device (16), the sleeve (15) is mounted on outside O-ring (14)；The elastic connecting device (16)
For row's circular protrusions on the inside of the broach of circular metal cylinder port, it is uniformly distributed；The tuning plug (9) fills with the elastic connection
Set the circular protrusions electrical connection of (16).
2. the coaxial electrically tunable filter of a kind of multi-cavity according to claim 1, it is characterised in that：The driving screw rod (7) with
Drive nut (8) vertical connection；The driving nut (8) connect with guide plate (10) plane；Each tuning plug (9) is to drive
Nut is symmetrically arranged centered on (8).
3. the coaxial electrically tunable filter of a kind of multi-cavity according to claim 1, it is characterised in that：Each guide rod (12) passes through
Linear bearing (11) is flexibly connected with guide plate (10).
4. the coaxial electrically tunable filter of a kind of multi-cavity according to claim 1, it is characterised in that：The multi-cavity coaxial electrical tune filter
Wave device includes six resonant cavities；Described first shares a cover board to third resonant cavity, and the 4th to the 6th resonant cavity shares
One cover board.
5. the coaxial electrically tunable filter of a kind of multi-cavity according to claim 4, it is characterised in that：The multi-cavity coaxial electrical tune filter
Wave device further include from ring radio frequency interface, be mounted on first or the 6th resonant cavity cover board on.
6. the coaxial electrically tunable filter of a kind of multi-cavity according to claim 3, it is characterised in that：The linear bearing (11) is outside
Portion is straight barrel type.
7. the coaxial electrically tunable filter of a kind of multi-cavity according to claim 1, it is characterised in that：Tuning plug (9) top
Equipped with cross deep trouth.
8. the coaxial electrically tunable filter of a kind of multi-cavity according to claim 1, it is characterised in that：The transmission mechanism (3) is outside
Face is equipped with dustproof encloser.
9. the coaxial electrically tunable filter of a kind of multi-cavity according to claim 1, it is characterised in that：The resonant cavity is metal
Constructed of aluminium, inner wire (13) are beryllium-bronze material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511025463.4A CN105449324B (en) | 2015-12-31 | 2015-12-31 | A kind of coaxial electrically tunable filter of multi-cavity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201511025463.4A CN105449324B (en) | 2015-12-31 | 2015-12-31 | A kind of coaxial electrically tunable filter of multi-cavity |
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| CN105449324A CN105449324A (en) | 2016-03-30 |
| CN105449324B true CN105449324B (en) | 2018-07-17 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106654483B (en) * | 2016-12-16 | 2019-07-05 | 京信通信技术(广州)有限公司 | Substrate integration wave-guide simulation and measuring system and its resonator device |
| CN107769802A (en) * | 2017-12-07 | 2018-03-06 | 宁波泰立电子科技有限公司 | A kind of disposable phase controlling intelligent regulator method of radio-frequency module based on wave filter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6147577A (en) * | 1998-01-15 | 2000-11-14 | K&L Microwave, Inc. | Tunable ceramic filters |
| CN2762159Y (en) * | 2004-12-21 | 2006-03-01 | 徐荣基 | Small armour soft optical cable connection set |
| WO2009027622A1 (en) * | 2007-08-30 | 2009-03-05 | Isotek Electronics Limited | A tuneable filter and a method of tuning such a filter |
| CN104393391A (en) * | 2014-12-09 | 2015-03-04 | 中国电子科技集团公司第五十四研究所 | Low-frequency high-power resonator and electrically tunable band stop filter |
| CN104393383A (en) * | 2014-12-09 | 2015-03-04 | 中国电子科技集团公司第五十四研究所 | Broad tuning coaxial electrically tunable filter and debugging method thereof |
| CN205319273U (en) * | 2015-12-31 | 2016-06-15 | 中国电子科技集团公司第五十四研究所 | Coaxial electrically tunable filter of multicavity |
-
2015
- 2015-12-31 CN CN201511025463.4A patent/CN105449324B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6147577A (en) * | 1998-01-15 | 2000-11-14 | K&L Microwave, Inc. | Tunable ceramic filters |
| CN2762159Y (en) * | 2004-12-21 | 2006-03-01 | 徐荣基 | Small armour soft optical cable connection set |
| WO2009027622A1 (en) * | 2007-08-30 | 2009-03-05 | Isotek Electronics Limited | A tuneable filter and a method of tuning such a filter |
| CN104393391A (en) * | 2014-12-09 | 2015-03-04 | 中国电子科技集团公司第五十四研究所 | Low-frequency high-power resonator and electrically tunable band stop filter |
| CN104393383A (en) * | 2014-12-09 | 2015-03-04 | 中国电子科技集团公司第五十四研究所 | Broad tuning coaxial electrically tunable filter and debugging method thereof |
| CN205319273U (en) * | 2015-12-31 | 2016-06-15 | 中国电子科技集团公司第五十四研究所 | Coaxial electrically tunable filter of multicavity |
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