CN102306858A - Low pass filter with cross coupling - Google Patents
Low pass filter with cross coupling Download PDFInfo
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- CN102306858A CN102306858A CN201110170313A CN201110170313A CN102306858A CN 102306858 A CN102306858 A CN 102306858A CN 201110170313 A CN201110170313 A CN 201110170313A CN 201110170313 A CN201110170313 A CN 201110170313A CN 102306858 A CN102306858 A CN 102306858A
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- inner wire
- metal tube
- low pass
- pass filter
- tuning screw
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Abstract
The invention discloses a low pass filter with cross coupling, which comprises an input and output structure, an inner conductor, a metal channel and a plurality of tuning bolts, wherein the inner conductor is not connected with the metal channel; the tuning bolts are inserted into the metal channel from the outside of the metal channel; the depth of the tuning bolts can be regulated from the outside of the metal channel; the tuning bolts are arranged along an axis of the inner conductor; the tuning bolts point to a top end in the metal channel and has a certain gap with the inner conductor; and the position of the inner conductor in the metal channel is supported and fixed by a medium material. The filter also comprises a coupling channel and a coupling conductor. The low pass filter provided by the invention can be widely used for electronic systems of various microwave bands and especially in the military and civil fields of radar, missile guidance, communication and the like.
Description
Technical field
The present invention relates to filter, specifically, relate to a kind of cross-linked low pass filter of being with that utilizes coaxial inner conductor and tuning screw formation.
Background technology
Periodically earth capacitance loads and can realize low pass filter on a coaxial inner conductor.The most common to low pass filter comprise two kinds of little band inner wires that coaxial configuration inner wire that disk loads and impedance suddenly change.Shortcomings such as the former has complex structure, requirement on machining accuracy is high, support is difficult, the inhibition of transition frequency range is precipitous inadequately, debugging difficulty.The latter has shortcomings such as the high-end loss of passage is high, power capacity is low, the stopband inhibition degree of depth is limited, the transition frequency range suppresses precipitous inadequately, can't finely tune.The band line low pass filter that suspends that occurs on the market is recently compared with common Microstrip Low-Pass, makes transition frequency range inhibition steepness obtain improvement to a certain degree owing to introduce transmission zero.Simultaneously, because signal energy partly is distributed in the air, the problem that the high-end Insertion Loss of band pass filter passband is high also obtains part and solves.But still there are shortcomings such as power capacity is low, the stopband inhibition degree of depth is limited, can't finely tune in the band line low pass filter that suspends.
Summary of the invention
The object of the present invention is to provide a kind of simple in structure, debugging is convenient, cut-off frequecy of passband is high, the transition frequency range suppresses the precipitous cross-linked low pass filter of being with.
For achieving the above object; The technical scheme that the present invention adopts is: a kind ofly be with cross-linked low pass filter; Mainly be made up of metal passage, some tuning screws and input/output structure, said tuning screw and input/output structure all run through the metal passage outer wall and extend into metal passage inside.
Said metal passage mainly is made up of metal tube and the inner wire that is arranged in the metal tube, and said inner wire is connected with input/output structure, and there is the gap in inwall between inner wire and the metal tube, and tuning screw is arranged along the axis of inner wire.
Said tuning screw extends into the metal passage position and points to inner wire, and also and between the inner wire there is the gap in tuning screw.
Said inner wall of metal tube is connected with dielectric material, and said dielectric material is connected with inner wire.
Also be provided with coupling conductors in the said metal tube, said coupling conductors is connected with dielectric material, and all and between the coupling conductors there are the gap in inner wall of metal tube and inner wire.
Said metal tube outer wall also is provided with the coupling tuning screw that runs through the metal tube outer wall, and said coupling tuning screw extends into the metal tube position and point to coupling conductors, and there are the gap in coupling tuning screw and coupling conductors.
Near per two tuning screws a coupling conductors is set, and two adjacent coupling conductors lay respectively at the inner wire both sides.
Said metal tube is the U bend pipe, and said inner wire is U-shaped and matches with metal tube, and coupling conductors is positioned at the concave surface of inner wire.
The shape of cross section of said inner wire is circle or rectangle, and said metal tube is a straight tube.
It is smooth flat that said tuning screw extends into the inner top of metal passage.
The present invention: comprise input/output structure, inner wire, metal passage, many tuning screws.Inner wire is not connected with metal tube.Tuning screw inserts outside metal tube the metal tube, and its degree of depth can be regulated outside metal tube.Tuning screw is arranged along the inner wire axis, and it points between interior top of metal tube and the inner wire has certain interval, is used to adjust the capacitive load of inner wire.The position of inner wire in metal tube is by the dielectric material support fixation.In order to introduce transmission zero to improve the steepness of transition band transmissions coefficient at the stopband low side, this filter can also comprise coupling conductors.In order outside the passband of low pass filter is high-end, to produce transmission zero, coupling conductors and inner wire form cross-couplings, will near per two tuning screws coupling conductors be set.Coupling conductors makes coupling conductors not be connected with metal tube by the Supporting Media materials for support.In order to adjust cross-linked size, be outside equipped with the coupling tuning screw that inserts in the metal tube at metal tube, its degree of depth can be regulated outside metal tube.The shape of cross section of said inner wire is circle or rectangle.The former has the low advantage of processing cost.The latter helps realizing maximum capacitive load.For this reason, the top in the tuning screw sensing metal passage is polished and is smooth flat.
In order to reduce the volume of filter; We are set to the U bend pipe by said metal tube; Inner wire is being also to present the U-shaped that is complementary with the U bend pipe and match with metal tube along the setting of metal tube axis direction; Exist the space part position this moment in U bend pipe concave surface; In order to reduce the space of filter, so coupling conductors is positioned at the concave surface of inner wire; Near per two tuning screws a coupling conductors is set simultaneously, and two adjacent coupling conductors lay respectively at the inner wire both sides; Promptly; Be not provided with near first tuning screw under the situation of coupling conductors; Be in accordingly second tuning screw near be provided with coupling conductors; And the like be provided with coupling conductors near being in the tuning screw of even number position; Two adjacent coupling conductors lay respectively at the inner wire both sides simultaneously, can form the coupling of an intersection.
In order to further specify cross-couplings; Get a sine wave at present; It gets the waveform of its one-period; Wavy line is considered as inner wire; Its initial position place at zero point; First tuning screw is set; Four/one-period, the crest place was provided with second tuning screw; The half period position is provided with the 3rd tuning screw; 3/4ths the cycle trough place the 4th tuning screw is set; The one-period place is provided with the 5th tuning screw, and above-mentioned tuning screw and inner wire can constitute one and not be with cross-linked filter; Coupling conductors and be separately positioned on the concave side of metal tube and inner wire with the coupling tuning screw that coupling conductors is complementary.
The operation principle of low pass filter can be narrated as follows.
At first, electromagnetic wave signal is input to the inner wire and along inner wire from an end of inner wire and transmits.When signal ran into any tuning screw, a part continued transmission along inner wire, and another part is reflected.In certain frequency, cancelled out each other by the signal that all tuning screws reflect, they and be zero, all signals of this frequency transmit along inner wire.This frequency is in the passband of low pass filter.In certain frequency, by the signal mutual superposition that all tuning screws reflect, most of signal of this frequency is reflected.This frequency is in the stopband of low pass filter.
In a word, adopt tuning screw to realize capacitive load, can finely tune low pass filter easily.Because only when supporting inner wire, adopt a small amount of Supporting Media material, promptly whenever being spaced a distance just is provided with a dielectric material, is used to support inner wire, so filter is owing to the loss that medium brings is lowered.The tuning screw that the coupling conductors that employing suspends is arranged at a distance from the position attaches and inner wire formation cross-couplings, outside the low pass filter passage is high-end, forms transmission zero, can improve the inhibition steepness of the high-end outer transition frequency range of passband effectively.
The invention has the advantages that simple in structure, debugging makes things convenient for, cut-off frequecy of passband is high, the transition frequency range suppresses, loss is low.Low pass filter of the present invention is expected to be widely used in the electronic system of each microwave band, particularly military affairs and civil areas such as radar, missile guidance, communication.
Description of drawings
Fig. 1 is the vertical view sketch map of the embodiment of the invention one.
Fig. 2 is the schematic side view of the embodiment of the invention two.
Fig. 3 is that the A-A of Fig. 2 is to cutaway view.
Label is expressed as respectively among the figure: 1, input/output structure; 2, inner wire; 3, metal passage; 4, tuning screw; 5, dielectric material; 6, metal tube; 7, coupling conductors; 8, coupling tuning screw.
Embodiment
Below in conjunction with embodiment the present invention is done to describe in detail further, but execution mode of the present invention is not limited thereto.
Embodiment one
As shown in Figure 1, a kind of low pass filter comprises 6,7 tuning screws 4 of 1,1 inner wire of input/output structure, 2,1 strip metal pipes.Inner wire 2 places in the metal tube 6 and is not connected with metal tube 6 inner surfaces.Metal tube 6 and the inner wire 2 that is arranged in the metal tube 6 constitute metal passage 3.Insert the metal tube 6 tuning screw 4 top outside metal tube 6.When low pass filter was tuning, its degree of depth can be regulated outside metal tube 6.After debugging finishes, tuning screw 4 in metal tube 6 the position and and inner wire 2 between the position relation be positioned at the fixed by nut outside the metal passband.
In order to help realizing cross-couplings, inner wire 2 axis become curved, and as shown in Figure 1, metal tube 6 is the U bend pipe, and inner inner wire 2 takes the shape of the letter U.Here as shown in Figure 1; We look inner wire 2 is the sinusoidal waveform in one 3/2nds cycle; 7 tuning screws 4 are evenly distributed on inner wire 2 axis, and wherein three coupling conductors 7 lay respectively at the concave side of metal tube 6 and inner wire 2, can form cross-couplings.
Tuning screw 4 is arranged along inner wire 2 axis, between top in its sensing metal tube 6 and the inner wire 2 certain interval is arranged, and is used to adjust the capacitive load of inner wire 2.The position of inner wire 2 in metal tube 6 is by 5 dielectric material 5 support fixation.In order to introduce transmission zero to improve the steepness of transition band transmissions coefficient at the stopband low side, this filter has also adopted 3 coupling conductors 7.The every position of coupling conductors 7 in metal tube 2 is supported by a Supporting Media material 5, and coupling conductors 7 is not connected with metal tube 2.In order to adjust cross-linked size, be outside equipped with a coupling tuning screw 8 that inserts in the metal tube 2 at every strip metal pipe 2, its degree of depth can be regulated outside metal tube 2.The shape of cross section of the inner wire 2 here is an arbitrary shape.In order to realize maximum capacitive load, the top that tuning screw 4 points in the metal tube 6 is polished.
Embodiment two
As shown in Figure 2, comprise the input and output coaxial configuration, 1 inner wire 2,1 strip metal pipe 6.Used 7 tuning screws 4 altogether, wherein 3 tuning screws 4 are positioned at the top of metal tube 6, and 2 tuning screws 4 are positioned at the below of metal tube 6, the place ahead of metal tube 6 with a tuning screw 4 is respectively arranged behind.Inner wire 2 places in the metal tube 6 and is not connected with metal tube 6 inner surfaces.Insert the metal tube 6 tuning screw 4 top outside metal tube 6.When low pass filter was tuning, its degree of depth can be regulated outside metal tube 6.After debugging finishes, tuning screw 4 in metal tube 6 the position and and inner wire 2 between the position relation be positioned at the fixed by nut outside the metal passband.This low pass filter has no cross coupling structure.Tuning screw 4 is arranged along inner wire 2 axis.Between top in its sensing metal tube 6 and the inner wire 2 certain interval is arranged, be used to adjust the capacitive load of inner wire 2.The position of inner wire 2 in metal tube 6 is by 2 dielectric material 5 support fixation.In order to realize maximum capacitive load, the shape of cross section of the inner wire 2 here is a rectangle, and the top that tuning screw 4 points in the metal tube 6 is polished.
We have provided the embodiment of two low pass filters here.Implementation of the present invention is hard-core.Such as, according to the requirement that stopband suppresses, the number that constitutes the tuning screw 4 of filter can be arranged to 3～50.This filter also can be used as part and is used to constitute other filtering device and microwave components.
Claims (10)
1. be with cross-linked low pass filter for one kind; It is characterized in that; Mainly be made up of metal passage (3), some tuning screws (4) and input/output structure (1), said tuning screw (4) and input/output structure (1) all run through metal passage (3) outer wall and extend into metal passage (3) inside.
2. a kind of cross-linked low pass filter of being with according to claim 1; It is characterized in that; Said metal passage (3) mainly is made up of metal tube (6) and the inner wire (2) that is arranged in the metal tube (6); Said inner wire (2) is connected with input/output structure (1); And there is the gap in inwall between inner wire (2) and the metal tube (6), and tuning screw (4) is arranged along the axis of inner wire (2).
3. a kind of cross-linked low pass filter of being with according to claim 2 is characterized in that, said tuning screw (4) extends into metal passage (3) position and points to inner wire (2), tuning screw (4) and and inner wire (2) between have the gap.
4. a kind of cross-linked low pass filter of being with according to claim 2 is characterized in that said metal tube (6) inwall is connected with dielectric material (5), and said dielectric material (5) is connected with inner wire (2).
5. a kind of cross-linked low pass filter of being with according to claim 2; It is characterized in that; Also be provided with coupling conductors (7) in the said metal tube (6); Said coupling conductors (7) is connected with dielectric material (5), and all and between the coupling conductors (7) there are the gap in metal tube (6) inwall and inner wire (2).
6. a kind of cross-linked low pass filter of being with according to claim 5; It is characterized in that; Said metal tube (6) outer wall also is provided with the coupling tuning screw (8) that runs through metal tube (6) outer wall; And said coupling tuning screw (8) extends into metal tube (6) position and points to coupling conductors (7), and there is the gap in coupling tuning screw (8) with coupling conductors (7).
7. according to claim 5 or 6 described a kind of cross-linked low pass filters of being with, it is characterized in that, a coupling conductors (7) is set near per two tuning screws (4), and adjacent two coupling conductors (7) lay respectively at inner wire (2) both sides.
8. a kind of cross-linked low pass filter of being with according to claim 7; It is characterized in that; Said metal tube (6) is the U bend pipe, and said inner wire (2) matches for U-shaped and with metal tube (6), and coupling conductors (7) is positioned at the concave surface of inner wire (2).
9. low pass filter according to claim 2 is characterized in that: the shape of cross section of said inner wire (2) is circle or rectangle, and said metal tube (6) is a straight tube.
10. according to any described low pass filter in the claim 1,2,3,4,5,6,8,9, it is characterized in that: it is smooth flat that said tuning screw (4) extends into the inner top of metal passage (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110170313 CN102306858B (en) | 2011-06-23 | 2011-06-23 | Low pass filter with cross coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110170313 CN102306858B (en) | 2011-06-23 | 2011-06-23 | Low pass filter with cross coupling |
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| CN102306858A true CN102306858A (en) | 2012-01-04 |
| CN102306858B CN102306858B (en) | 2013-11-06 |
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| CN 201110170313 Active CN102306858B (en) | 2011-06-23 | 2011-06-23 | Low pass filter with cross coupling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111855211A (en) * | 2020-07-31 | 2020-10-30 | 北京航空航天大学 | Optimal demodulation frequency band determination method for fault feature enhancement |
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| CN201204241Y (en) * | 2008-06-18 | 2009-03-04 | 中国航天科技集团公司第五研究院第五〇四研究所 | Integrated coaxial band-pass filter and directional coupler component |
| CN101521303A (en) * | 2009-04-09 | 2009-09-02 | 成都赛纳赛德科技有限公司 | Folded waveguide filter |
| CN101533940A (en) * | 2009-03-25 | 2009-09-16 | 中国航天科技集团公司第五研究院第五〇四研究所 | Public chamber input multiplexer |
| CN201601203U (en) * | 2009-12-21 | 2010-10-06 | 成都赛纳赛德科技有限公司 | Ultra wide band cavity filter |
| CN201853789U (en) * | 2010-08-24 | 2011-06-01 | 深圳市大富科技股份有限公司 | Communication equipment, cavity filter and cover plate of cavity filter |
| CN202067882U (en) * | 2011-06-23 | 2011-12-07 | 成都赛纳赛德科技有限公司 | Band cross-coupled low-pass filter |
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2011
- 2011-06-23 CN CN 201110170313 patent/CN102306858B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201204241Y (en) * | 2008-06-18 | 2009-03-04 | 中国航天科技集团公司第五研究院第五〇四研究所 | Integrated coaxial band-pass filter and directional coupler component |
| CN101533940A (en) * | 2009-03-25 | 2009-09-16 | 中国航天科技集团公司第五研究院第五〇四研究所 | Public chamber input multiplexer |
| CN101521303A (en) * | 2009-04-09 | 2009-09-02 | 成都赛纳赛德科技有限公司 | Folded waveguide filter |
| CN201601203U (en) * | 2009-12-21 | 2010-10-06 | 成都赛纳赛德科技有限公司 | Ultra wide band cavity filter |
| CN201853789U (en) * | 2010-08-24 | 2011-06-01 | 深圳市大富科技股份有限公司 | Communication equipment, cavity filter and cover plate of cavity filter |
| CN202067882U (en) * | 2011-06-23 | 2011-12-07 | 成都赛纳赛德科技有限公司 | Band cross-coupled low-pass filter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111855211A (en) * | 2020-07-31 | 2020-10-30 | 北京航空航天大学 | Optimal demodulation frequency band determination method for fault feature enhancement |
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| CN102306858B (en) | 2013-11-06 |
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Effective date of registration: 20201123 Address after: The Yangtze River town of Rugao city of Jiangsu Province in 226500 in Nantong city (Rugao port) the Jinlu No. 6 Patentee after: JIANGSU CHINA RAILWAY SHANHAIGUAN BRIDGE HEAVY INDUSTRY Co.,Ltd. Address before: 610000 Shiyang Industrial Park, hi tech Zone, Chengdu, Sichuan Patentee before: CHENGDU SINOSCITE TECHNOLOGY Co.,Ltd. |
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