CN102945994A - Rotary adjustable filter - Google Patents
Rotary adjustable filter Download PDFInfo
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- CN102945994A CN102945994A CN2012105117900A CN201210511790A CN102945994A CN 102945994 A CN102945994 A CN 102945994A CN 2012105117900 A CN2012105117900 A CN 2012105117900A CN 201210511790 A CN201210511790 A CN 201210511790A CN 102945994 A CN102945994 A CN 102945994A
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Abstract
The invention discloses a rotary adjustable filter. The filter comprises at least two resonant cavities sequentially connected with each other in series, two input/output structures and metal bodies, wherein each two adjacent resonant cavities are communicated with each other through a main coupling structure; the two input/output structures are respectively communicated with the resonant cavities for receiving input signals and releasing output signals; a cover plate or a bottom plate or a side plate of each resonant cavity is provided with an adjustable metal column for adjusting a resonance frequency and extending into the resonant cavity; one end, extending into the resonant cavity, of each adjustable metal column is connected with at least one metal rod; and the metal bodies are located in the resonant cavities. The rotary adjustable filter disclosed by the invention has the advantages of simple structure and low cost; and the working frequency of the rotary adjustable filter can be conveniently adjusted after the rotary adjustable filter is mounted in a system, and thus the rotary adjustable filter disclosed by the invention can be widely applied to the fields of military and civil communication.
Description
Technical field
The present invention relates to a kind of filter, specifically, relate to a kind of simple in structure, cost is low, the rotary-type tunable filter that passband or stop-band frequency can conveniently be adjusted.
Background technology
Filter is a kind of general original paper in modern microwave communication and the Military Electronics system.Rotary-type tunable filter has important application in microwave measurement and secure communication.Existing rotary-type tunable filter can be divided into the types such as pure electric tuning, motor-driven electric tuning and manual tuning based on variable capacitance diode.Wherein first kind device is because insertion loss is too large, and application is restricted.Precision stepper motor of the employing that the Equations of The Second Kind device has promotes many tuning plugs, and the change in depth that all tuning plugs extend in each resonant cavity is identical, so that this rotary-type tunable filter can't be accomplished the best in the coupling at different frequency place.Simultaneously, very high to machining accuracy and the quality of fit requirement of all parts in order accurately to control position and the degree of depth of each tuning plug because the frequency of each resonant cavity is subjected to the impact of tuning plug very large, cause the cost of such filter very high.And, owing to the employing of precision stepper motor, more raised the manufacturing cost of device.The 3rd class device is with U.S. K﹠amp; The variable band-pass filter of L is representative, adopts a rotating shaft drive to be arranged in the tuner simultaneous equal rotation of each resonant cavity, thereby reaches the purpose of regulating filter frequencies, needs equally point-device machining accuracy and assembly precision.Its price is several thousand to several ten thousand yuan one, is that on a large scale particularly commercial communication institute is unaffordable.
Summary of the invention
The object of the present invention is to provide a kind of simple in structure, cost is low, the rotary-type tunable filter that band connection frequency can conveniently be adjusted.
To achieve these goals, the technical solution used in the present invention is as follows: rotary-type tunable filter, comprise at least two successively resonant cavitys of serial connection connection, also comprise two input/output structures, these two input/output structures are communicated with respectively in order to the resonant cavity of accepting input signal with discharge on the resonant cavity of output signal, be communicated with by main coupled structure between adjacent two resonant cavitys, be provided with the adjustable metal post regulating resonance frequency and extend into resonant cavity on the cover plate of each resonant cavity or base plate or the side plate, the adjustable metal post stretches at least one Metallic rod that the end in the resonant cavity connects, and also comprises the metallic object that is positioned at resonant cavity.
Be marked with the adjustable metal post around the mark line of its axis anglec of rotation in the outer face that described adjustable metal post extends resonant cavity.
Also comprise maintaining static and the dial coaxial with the adjustable metal post have at least 2 graduation marks to intersect at the axis of corresponding adjustable metal post on this dial; By being positioned at mark line on the described adjustable metal post outer face and the scale on the dial, be used for measuring described adjustable metal post around the angle of its axis rotation.
The height of described metallic object on the axis of the adjustable metal post of correspondence is according to around the angle monotonic increase of adjustable metal mast axis rotation or successively decrease.
One end of described metallic object is connected with the resonant cavity inwall, the metallic object other end is near the adjustable metal post, end near the adjustable metal post is provided with at least two sheet metals, Metallic rod is between adjacent two metal sheets, corresponding described Metallic rod is at the adjustable metal post of correspondence during around its axis rotation, the intersection area monotonic increase between Metallic rod and this sheet metal or successively decrease.Described rotary-type tunable filter, also comprise metal shell, resonant cavity is arranged in the cavity of metal shell, the outer face of adjustable metal post is run through behind the metal shell and is extended to the outside of metal shell, corresponding to each described adjustable metal post, be provided with in order to the fixing locking device of adjustable metal post at the cover plate of metal shell or base plate or side plate; By unclamping this locking device, its corresponding adjustable metal post is regulated outside resonant cavity around the angle of its axis rotation; By locking this locking device, its corresponding adjustable metal post is fixed around the angle of its axis rotation.
Described locking device is the axis plain nut vertical with the adjustable metal post; Or described locking device is the assembly of screw rod and soft material and locking nut formation, locking nut and soft material are separately positioned on the two ends of screw rod, locking nut is set on the screw rod external diameter, wherein, the axis of screw rod is vertical with corresponding adjustable metal mast axis, and described soft material is between screw rod and corresponding adjustable metal post.
Be provided with the groove of convenient this adjustable metal post of rotation in described adjustable metal post outer face.
Described input/output structure is waveguide, two-conductor probe or two-conductor coupling loop structure.
Between two resonant cavitys of at least 1 resonant cavity in interval, be provided with cross coupling structure.
The resonance frequency of each resonant cavity of rotary-type tunable filter can be by its adjustable metal post independent regulation of rotation.
The anglec of rotation of adjustable metal post reads by being positioned at mark line on the described adjustable metal post outer face and the scale on the dial, and mark line and dial can be measured described adjustable metal post around the angle of its axis rotation.
In order to change the resonance frequency of corresponding resonant cavity by rotating described adjustable metal post, we can adopt two schemes.The height of described metallic object on the axis direction of the adjustable metal post of correspondence is according to around the angle monotonic increase of adjustable metal mast axis rotation or successively decrease; When the Metallic rod on the adjustable metal post is rotated with this adjustable metal post, its with corresponding metallic object between the gap monotonic increase or successively decrease, thereby the resonance frequency of the resonant cavity of dull adjusting correspondence.The planned course of upper surface of metallic object that is positioned at adjustable metal post below is consistent with the movement locus of Metallic rod, and namely the face of the movement locus of Metallic rod formation is positioned at the top of the upper surface of metallic object, directly over preferentially being positioned at.
First scheme, an end of described metallic object is connected with the resonant cavity inwall, and the metallic object other end is near the adjustable metal post, and an end of close adjustable metal post is provided with at least two sheet metals, and Metallic rod is between adjacent two metal sheets; When the Metallic rod of adjustable metal post is rotated with this adjustable metal post, its with corresponding sheet metal between area monotonic increase or variations of successively decreasing of lap, thereby the resonance frequency of the resonant cavity of dullness adjusting correspondence.Gap between adjacent two sheet metals can allow the slip of adjustable metal post to get final product, and namely adjacent two sheet metals lay respectively at the both sides on the plane of adjustable metal post movement locus formation all the time.
Corresponding to each described adjustable metal post, be provided with locking device at cover plate, base plate or the side plate of rotary-type tunable filter, namely be provided with locking device at metal shell, locking device and adjustable metal post are used for fixedly adjustable metal post by the top interference fit; By unclamping this locking device, the adjustable metal post is in relaxed state, regulate this adjustable metal post by rotation and can be regulated outside resonant cavity around the angle of its axis rotation, the degree of depth that specifically stretches in the corresponding resonant cavity by adjusting adjustable metal post is regulated resonance frequency; By locking this locking device, the adjustable metal post is in tightening state, and the adjustable metal post is fixed around the angle of its axis rotation, and namely the degree of depth that stretches in the corresponding resonant cavity of adjustable metal column is fixed.
Described locking device can be plain nut, also can be by the axis screw rod vertical with this adjustable metal mast axis, and soft material and locking nut form.Wherein soft material can be avoided the surperficial injury to the adjustable metal post.
On the described adjustable metal post external screw thread is arranged, with the screw-internal thread fit on cover plate, base plate or the side plate of each resonant cavity.Rotate this adjustable metal post by the axis around the adjustable metal post, can regulate this adjustable metal post and stretch into the degree of depth in the corresponding resonant cavity, thus the resonance frequency of regulating this resonant cavity.
Be provided with the groove that is conducive to rotate this adjustable metal post at top, described adjustable metal post outer end.This groove can be " one " font, also can be hexagon, screwdriver easy to use or hex tool.
In described resonant cavity, on the position relative with corresponding adjustable metal post, be provided with the metallic object that is connected with the inwall of this resonant cavity.This metallic object can be when corresponding adjustable metal post position be positioned at its initial value, easily the resonance frequency of the resonant cavity of correspondence is adjusted to given frequency.
Cross coupling structure is on each resonant cavity basis of main coupled structure serial connection.Realize bypass coupling, form transmission zero at the transmission curve of this filter, improve the Out-of-band rejection of this filter.
Maximum characteristics of the present invention are independently to be provided with tuner on each resonant cavity of rotary-type tunable filter, and namely tuner is the adjustable metal post.Scale on mark line by adjustable metal post outer face and the corresponding dial can be measured the anglec of rotation of each adjustable metal post after the frequency change, thereby regulate the Metallic rod of each adjustable metal post and the electric capacity between the intra resonant cavity metallic object.This device does not need the anglec of rotation simultaneous equal of all adjustable metal posts to change, thereby the required precision of mechanical tuning device is reduced greatly, thereby has reached the purpose of low-cost adjusting filter passband frequency.
The band connection frequency of common filter also can be regulated by tuning screw in principle.But owing to do not have mark line and the corresponding dial of this adjustable metal capital end of class, each tuning screw is wayward around the angle of its axis rotation.If at this moment will change the band connection frequency of filter, need this filter is taken off from system, at tester, finish under the monitoring such as vector network analyzer.This method can't be finished online, will be very inconvenient in practical operation.
The operation principle of the invention of rotary-type tunable filter and normal tape bandpass filter are similar.Input signal is realized filtering characteristic through the identical resonant cavity of several frequencies that are coupled mutually.Because its quasi-periodic structure has passband and stopband characteristic on the frequency spectrum.The adjustable metal post plays the purpose that capacitive load changes resonant frequency.Cross-couplings produces the Out-of-band rejection that transmission zero is improved filter in transmission characteristic.
The invention has the advantages that: simple in structure, cost is low, band connection frequency can conveniently be adjusted.
Description of drawings
Fig. 1 is that the present invention removes the vertical view of (comprising adjustable metal post and Metallic rod) behind the cover plate.
Fig. 2 is the vertical view that the present invention includes cover plate.
Fig. 3 is adjustable metal post, Metallic rod and the metallic object position view in resonant cavity.
Fig. 4 is adjustable metal post, Metallic rod and metallic object, the sheet metal position view in resonant cavity.
Fig. 5 is vertical view behind the embodiment 2 removal cover plates.
Fig. 6 is vertical view behind the embodiment 3 removal cover plates.
The corresponding title of attached number in the figure: 1-resonant cavity, 2-input/output structure, 3-master's coupled structure, 4-metallic object, 41-sheet metal, 5-adjustable metal post, 51-Metallic rod, 6-locking device, 7-dial, 8-groove, 9-mark line, 10-cross coupling structure.
Embodiment
Referring to Fig. 1 to Fig. 3, a kind of rotary-type tunable filter, comprise 4 resonant cavitys 1, the input/output structure 2 of two waveguiding structure forms, be connected in series 3 main coupled structures 3 of each resonant cavity 1, be positioned at the adjustable metal post 5 on the cover plate of each resonant cavity 1, the end that every adjustable metal post 5 stretches in the resonant cavity 1 is provided with a Metallic rod 51, also comprise a metallic object 4 that is positioned at each resonant cavity 1, the resonance frequency of described each resonant cavity 1 can be by its adjustable metal post 5 independent regulation of rotation.Preferentially the axis of Metallic rod 51 is arranged to vertical with the axis of adjustable metal post 5.
There is this adjustable metal post 5 of mark outer face at the resonant cavity 1 of described adjustable metal post 5 correspondences around the mark line 9 of its axis anglec of rotation.
Be coaxially arranged with a dial 7 with described adjustable metal post 5, this dial 7 does not rotate and is fixed on the cover plate of metal shell with the rotation of adjustable metal post 5, is provided with the axis that more than 10 root graduation marks intersect at corresponding adjustable metal post 5 on this dial 7.By being positioned at mark line 9 on described adjustable metal post 5 outer faces and the scale on the corresponding dial 7, can measure described adjustable metal post 5 around the angle of its axis rotation.
The height of metallic object 4 on the axis direction of the adjustable metal post 5 of correspondence is according to around the angle monotonic increase of adjustable metal post 5 axis rotations or successively decrease.When the Metallic rod 51 of adjustable metal post 5 is rotated with this adjustable metal post 5, the gap monotone variation between Metallic rod 51 and the corresponding metallic object 4, thereby the resonance frequency of the resonant cavity 1 of dull adjusting correspondence.
Corresponding to each described adjustable metal post 5, be provided with locking device 6 at the cover plate of rotary-type tunable filter; By unclamping this locking device 6, this adjustable metal post 5 can be regulated outside resonant cavity 1 around angle and the degree of depth of its axis rotation; By locking this locking device 6, adjustable metal post 5 is fixed around angle and the degree of depth of its axis rotation.
Described locking device 6 is plain nut, or described locking device 6 is the assembly of screw rod and soft material and locking nut formation, locking nut and soft material are separately positioned on the two ends of screw rod, locking nut is set on the screw rod external diameter, wherein, the axis of screw rod is vertical with corresponding adjustable metal post 5 axis, and described soft material is between screw rod and corresponding adjustable metal post 5.The turn locking nut causes screw rod to drive soft material towards adjustable metal post 5 directions or deviates from adjustable metal post 5 directions and move, with fixing or lax adjustable metal post 5.Make things convenient for adjustable metal post 5 location, with the parameters of positioning filter.On each root adjustable metal post 5 external screw thread is arranged, with the screw-internal thread fit on cover plate, base plate or the side plate of each resonant cavity 1.Rotate this adjustable metal post 5 by the axis around adjustable metal post 5, can regulate this adjustable metal post 5 and stretch into the degree of depth in the corresponding resonant cavity 1, thus the resonance frequency of regulating this resonant cavity 1.
Be provided with " one " font groove 8 that is conducive to rotate this adjustable metal post 5 at each top, root adjustable metal post 5 outer end.
Described input/output structure 2 is waveguide.
In described resonant cavity 1, be provided with the metallic object 4 that root is connected with the inwall of this resonant cavity 1, metallic object 4 be positioned at corresponding adjustable metal post 5 under, the degree of depth that this metallic object 4 gos deep in the corresponding resonant cavity 1 can be regulated from the external world.
Four resonant cavitys are respectively first resonant cavity, second resonant cavity, the 3rd resonant cavity and the 4th resonant cavity that serial connection successively is communicated with, and between first resonant cavity and the 4th resonant cavity, also have a cross coupling structure 10.This cross coupling structure is the metal coupling line of a dielectric insulation.Be separated with second resonant cavity and the 3rd these two resonant cavitys of resonant cavity between wherein between first resonant cavity 1 and the 4th resonant cavity.The input/output structure 2 that is connected to the 4th resonant cavity is output, and the input/output structure 2 that is connected to the 1st resonant cavity is input.
Such as Figure 4 and 5, only be that with the difference of embodiment 1 end of described metallic object 4 is connected with resonant cavity 1 inwall, metallic object 4 other ends are near adjustable metal post 5, end near adjustable metal post 5 is provided with at least two sheet metals 41, and Metallic rod 51 is between adjacent two metal sheets 41; When the Metallic rod 51 of adjustable metal post 5 is rotated with this adjustable metal post 5, its with corresponding sheet metal 41 between area monotonic increase or variations of successively decreasing of lap, thereby the resonance frequency of the resonant cavity 1 of dullness adjusting correspondence.The preferential upper surface of the axis of adjustable metal post 5 is vertical and sheet metal, wherein, the upper surface refers to the face parallel with cover plate of resonant cavity, the while, described metallic object 4 was installed in the sidewall of resonant cavity.
Such as Fig. 6, only be that with the difference of embodiment 1 two input/output structures 2 lay respectively on the relative two sides of metal shell.
Above-mentioned only for giving an example.All resonant cavitys 1 all are rectangular cavity.In the actual production, these resonant cavitys can be cylindrical cavity or other labyrinth more.
As mentioned above, can realize the present invention, but the present invention is not limited to above-described embodiment.
Claims (10)
1. rotary-type tunable filter, it is characterized in that, comprise at least two successively resonant cavitys (1) of serial connection connection, also comprise two input/output structures (2), these two input/output structures (2) are communicated with respectively in order to the resonant cavity (1) of accepting input signal with discharge on the resonant cavity (1) of output signal, be communicated with by main coupled structure (3) between adjacent two resonant cavitys (1), be provided with to regulate resonance frequency on the cover plate of each resonant cavity (1) or base plate or the side plate and extend into the adjustable metal post (5) of resonant cavity (1), adjustable metal post (5) stretches at least one Metallic rod (51) that the end in the resonant cavity (1) connects, and also comprises the metallic object (4) that is positioned at resonant cavity (1).
2. rotary-type tunable filter according to claim 1 is characterized in that, the outer face of extending resonant cavity (1) at described adjustable metal post (5) is marked with adjustable metal post (5) around the mark line (9) of its axis anglec of rotation.
3. rotary-type tunable filter according to claim 2, it is characterized in that, also comprise maintaining static and the dial (7) coaxial with adjustable metal post (5) have at least 2 graduation marks to intersect at the axis of corresponding adjustable metal post (5) on this dial (7); By being positioned at mark line (9) on described adjustable metal post (5) outer face and the scale on the dial (7), be used for measuring described adjustable metal post (5) around the angle of its axis rotation.
4. rotary-type tunable filter according to claim 1 is characterized in that, the height of described metallic object (4) on the axis of the adjustable metal post (5) of correspondence is according to around the angle monotonic increase of adjustable metal post (5) axis rotation or successively decrease.
5. rotary-type tunable filter according to claim 1, it is characterized in that, one end of described metallic object (4) is connected with resonant cavity (1) inwall, metallic object (4) other end is near adjustable metal post (5), end near adjustable metal post (5) is provided with at least two sheet metals (41), Metallic rod (51) is positioned between the adjacent two metal sheets (41), corresponding described Metallic rod (51) is at the adjustable metal post (5) of correspondence during around its axis rotation, the intersection area monotonic increase between Metallic rod (51) and this sheet metal (41) or successively decrease.
6. rotary-type tunable filter according to claim 1, it is characterized in that, also comprise metal shell, resonant cavity (1) is arranged in the cavity of metal shell, the outer face of adjustable metal post (5) is run through behind the metal shell and is extended to the outside of metal shell, corresponding to each described adjustable metal post (5), be provided with in order to the fixing locking device (6) of adjustable metal post (5) at the cover plate of metal shell or base plate or side plate; By unclamping this locking device (6), its corresponding adjustable metal post (5) is regulated outside resonant cavity (1) around the angle of its axis rotation; By locking this locking device (6), its corresponding adjustable metal post (5) is fixed around the angle of its axis rotation.
7. rotary-type tunable filter according to claim 6 is characterized in that, described locking device (6) is the axis plain nut vertical with adjustable metal post (5); Or described locking device (6) is the assembly of screw rod and soft material and locking nut formation, locking nut and soft material are separately positioned on the two ends of screw rod, locking nut is set on the screw rod external diameter, wherein, the axis of screw rod is vertical with corresponding adjustable metal post (5) axis, and described soft material is positioned between screw rod and the corresponding adjustable metal post (5).
8. rotary-type tunable filter according to claim 1 is characterized in that, is provided with the groove (8) of convenient this adjustable metal post (5) of rotation in described adjustable metal post (5) outer face.
9. rotary-type tunable filter according to claim 1 is characterized in that, described input/output structure (2) is waveguide, two-conductor probe or two-conductor coupling loop structure.
10. described rotary-type tunable filter is characterized in that according to claim 1-9, is provided with cross coupling structure (10) between two resonant cavitys of at least 1 resonant cavity in interval (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105117900A CN102945994A (en) | 2012-12-04 | 2012-12-04 | Rotary adjustable filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105117900A CN102945994A (en) | 2012-12-04 | 2012-12-04 | Rotary adjustable filter |
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| CN102945994A true CN102945994A (en) | 2013-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012105117900A Pending CN102945994A (en) | 2012-12-04 | 2012-12-04 | Rotary adjustable filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105244247A (en) * | 2015-11-04 | 2016-01-13 | 中国工程物理研究院应用电子学研究所 | Adjustable slow wave structure microwave device |
| CN105789791A (en) * | 2016-03-11 | 2016-07-20 | 北京邮电大学 | Wide-range cavity filter with adjustable frequency band |
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| EP0961338B1 (en) * | 1998-05-27 | 2006-04-05 | Ace Technology | Bandpass filter with dielectric resonators |
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| CN202178356U (en) * | 2011-09-13 | 2012-03-28 | 安徽海特微波通信有限公司 | Band-stop filter with tuning apparatus |
| CN102723569A (en) * | 2012-06-19 | 2012-10-10 | 成都赛纳赛德科技有限公司 | Adjustable resonant cavity |
| CN202940314U (en) * | 2012-12-04 | 2013-05-15 | 成都赛纳赛德科技有限公司 | Rotary adjustable filter |
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| EP0961338B1 (en) * | 1998-05-27 | 2006-04-05 | Ace Technology | Bandpass filter with dielectric resonators |
| CN1469665A (en) * | 2002-06-12 | 2004-01-21 | ���µ�����ҵ��ʽ���� | Dielectric wave filter, communication apparatus and method for controlling resonant frequency |
| CN1949585A (en) * | 2006-10-27 | 2007-04-18 | 镇江蓝宝石电子实业有限公司 | RF centre frequency adjustable filer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105244247A (en) * | 2015-11-04 | 2016-01-13 | 中国工程物理研究院应用电子学研究所 | Adjustable slow wave structure microwave device |
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| CN105789791A (en) * | 2016-03-11 | 2016-07-20 | 北京邮电大学 | Wide-range cavity filter with adjustable frequency band |
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Application publication date: 20130227 |