CN202474152U - Low-pass filter based on helical metal wire - Google Patents
Low-pass filter based on helical metal wire Download PDFInfo
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- CN202474152U CN202474152U CN 201220096809 CN201220096809U CN202474152U CN 202474152 U CN202474152 U CN 202474152U CN 201220096809 CN201220096809 CN 201220096809 CN 201220096809 U CN201220096809 U CN 201220096809U CN 202474152 U CN202474152 U CN 202474152U
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Abstract
The utility model discloses a low-pass filter based on a helical metal wire. The low-pass filter based on the helical metal wire comprises a base provided with a metal cavity and a cover plate arranged on the base, and further comprises a metal wire, insulating materials and at least three metal plates disposed in the metal cavity. The metal plates are connected with one another through the metal wire, and the metal plates are insulated from the metal cavity through the insulating materials, and a portion of the metal wire between two adjacent metal plates is in a helical shape. The low-pass filter based on the helical metal wire has the advantages of being simple in structural processing, convenient to debug, and high in pass band cut-off frequency. The low-pass filter based on the helical metal wire is expected to be widely used in electronic systems of various microwave bands, especially in military and civil fields such as radar, missile guidance, communication and the like.
Description
Technical field
The utility model relates to a kind of low pass filter based on helical wire, specifically, relates to a kind of low pass filter that utilizes metal wire and metallic plate to constitute.
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 high problem of the band high-end Insertion Loss of line pass band that suspends 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.
The utility model content
The purpose of the utility model is to provide the low pass filter that a kind of structure processing is simple, debugging is convenient, cut-off frequecy of passband is high.
To achieve these goals; The technical scheme that the utility model adopts is following: a kind of low pass filter based on helical wire; Comprise the base that is provided with metal cavitg, and be arranged on the cover plate on the base, and at least three metallic plates that are arranged in metal cavitg; Said metallic plate links together through metal wire, and metallic plate is through insulating material and metal cavitg insulation; Said metal wire is a spirality between two adjacent metal plates.
In order to form filter function, metallic plate and metal cavitg will form insulation, generally adopt the unsettled metallic plate that is provided with of medium, but in order to reduce the volume of filter, so metallic plate insulate through insulating material and metal cavitg.In order to form the series connection signal processing, therefore use metal wire that each metallic plate is linked together.Said metal wire is a spirality between two adjacent metal plates.Based on geometry, can effectively in unit plane, increase the length of the middle metal wire of filter.Can make under the prerequisite that reduces the overall filter volume, can not produce the influence to performance of filter, that is, after the volume of filter was little, the length of metal wire is appointed so can reach predetermined design length.Compare straight line, broken line, curve, the length of helix is all long than straight line, broken line, curve.
Said metal wire is a column, and its shape of cross section is consistent along its axis.
Said metal wire shape of cross section is circular.
Said metal wire shape of cross section is a rectangle.
Based on the restriction of the shape of above-mentioned metal wire, generally adopt columniform metal wire.
The shape of cross section of metal cavitg is a rectangle; The shape of cross section of said metallic plate and metal wire axis normal is a rectangle, and wrapped with insulation is adopted on the surface of metallic plate and metal wire parallel axes; Thickness≤the 0.15mm of insulating material, metallic plate is a chamfering near two angles of metal cavitg bottom, chamfer radius is less than or equal to 1/3 of metallic plate width.
Make things convenient for the fast and convenient insertion metal cavitg of metallic plate ability after forming chamfering.
Contrast according to experimental data; When the thickness of insulating material≤0.15mm, the centre frequency of parasitic passband and the ratio of cut-off frequecy of passband can become along with reducing of insulation thickness greatly gradually, and we are based on such experimental result; According to our conventional design; We generally adopt the centre frequency of parasitic passband and the bigger design of ratio of cut-off frequecy of passband, and the centre frequency of parasitic passband and the ratio of cut-off frequecy of passband are big more, and the performance of filter is good more; Therefore based on the basis of above-mentioned principle and design, we the thickness of the insulating material of this design generally≤0.15mm.In order effectively to say something, in conjunction with following subordinate list 1 in further explanation.
Subordinate list 1 is the experimental data table of comparisons of insulation thickness, cut-off frequecy of passband (GHz), parasitic passband centre frequency (GHz)
Based on this table; We can draw following result, and when insulation thickness equaled 0.25mm, parasitic passband centre frequency (GHz) was 4.6 with the ratio of cut-off frequecy of passband (GHz); When insulation thickness equals 0.2mm; Parasitic passband centre frequency (GHz) is 5.1 with the ratio of cut-off frequecy of passband (GHz), and when insulation thickness equaled 0.15mm, parasitic passband centre frequency (GHz) was 6 with the ratio of cut-off frequecy of passband (GHz); When insulation thickness equaled 0.1mm, parasitic passband centre frequency (GHz) was 7 with the ratio of cut-off frequecy of passband (GHz); Based on this result of calculation; We analyze and draw; After insulation thickness≤0.15mm; Parasitic passband centre frequency (GHz) becomes bigger and bigger with the ratio of cut-off frequecy of passband (GHz), and after the edge material thickness was greater than 0.15mm, parasitic passband centre frequency (GHz) became littler and littler with the ratio of cut-off frequecy of passband (GHz).
Therefore, we select with the Thickness Design of insulating material for≤0.15mm is an optimum efficiency.
Make things convenient for the fast and convenient insertion metal cavitg of metallic plate ability after forming chamfering.
The upper surface that said metallic plate is parallel to the metal wire axis direction has the rectangular channel that extends to the metallic plate central point; The width of rectangular channel is than the diameter big 0.01 to 1mm of metal wire; Generally choose the diameter big 0.05mm of the width of rectangular channel than metal wire, rectangular channel length equals the thickness of metallic plate; Metal wire is positioned over the inside of rectangular channel and contacts with the rectangular channel inwall.
Therefore metal wire is positioned over the inside of rectangular channel and contacts with the rectangular channel inwall, can make that metallic plate is serially connected.
Said metal wire is positioned over the trench bottom of rectangular channel and contacts with the rectangular channel inwall.
All metallic plates are identical with the cross sectional dimensions and the shape of metal wire axis normal.
Said upper cover plate is provided with and runs through upper cover plate and extend into the inner tuning screw of metal cavitg, and tuning screw is positioned at directly over the metallic plate.The parameter setting of tuning screw tunable filter.
The two ends of the axis direction of said metal wire are connected to input/output structure.
Input/output structure adopts existing coaxial input/output structure.
Based on foregoing: a kind of low pass filter based on helical wire of the utility model design comprises upper cover plate, base; Metal wire, metal cavitg, insulating material; And at least three metallic plates that are arranged in metal cavitg, metallic plate is connected by metal wire and insulate with metal cavitg; And metallic plate is perpendicular to the bottom surface, chamber of metal cavitg.
Metal wire is a column, and its shape of cross section does not change along its axis; Metal wire is buied from market for existing material.
In addition, tuning screw preferentially is arranged on directly over the notch of rectangular channel.
The operation principle of low pass filter can be narrated as follows.
Periodic loading capacitance can be realized low pass filter on an inner wire; The metallic plate that adds in the conductor be the equal of on transmission line parallel connection an electric capacity; Metal wire between the two liang of metallic plates inductance that partly is equivalent to connect, so just the formation of equivalence a simple LC filter circuit, when signal when metal wire is propagated; Utilize the principle of the logical high frequency resistance of electric capacity low frequency, the logical low frequency resistance of inductance high frequency; Needed low frequency is passed through, and unwanted attenuation obtains the low pass filter of desired parameters with this.
The advantage of the utility model is, the low pass filter that a kind of structure processing is simple, debugging is convenient, cut-off frequecy of passband is high.The low pass filter of the utility model 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 longitudinal sectional drawing of the utility model embodiment.
Fig. 2 is that the A-A of the utility model embodiment is to sketch map.
Label is expressed as respectively among the figure: 1, upper cover plate; 2, base; 3, metallic plate; 4, metal wire; 5, metal cavitg; 6, insulating material; 7, tuning screw; 8, rectangular channel.
Embodiment
Below in conjunction with embodiment the utility model is done to specify further, but the utility model execution mode is not limited thereto.
Embodiment
Like Fig. 1, shown in Figure 2, a kind of low pass filter based on helical wire comprises the base 2 that is provided with metal cavitg 5; And be arranged on the cover plate 1 on the base 2; Also comprise metal wire 4 and insulating material 6, and at least three metallic plates 3 that are arranged in metal cavitg 5, it is characterized in that; Said metallic plate 3 links together through metal wire 4, and metallic plate 3 is through insulating material 6 and metal cavitg 5 insulation; The shape of cross section of metal cavitg 5 is a rectangle.Metal wire 4 is a column, and its shape of cross section is consistent along its axis; Said metal wire 4 is a spirality between two adjacent metal plates 3.
The upper surface that metallic plate 3 is parallel to metal wire 4 axis directions has the rectangular channel 8 that extends to metallic plate 3 central points, and the width of rectangular channel 8 is than the big 0.05mm of diameter of metal wire 4, and rectangular channel 8 length equal the thickness of metallic plate 3.
Upper cover plate 1 is provided with the tuning screw 7 that runs through upper cover plate 1 and extend into metal cavitg 5 inside, and the two ends of the axis direction of metal wire 4 are connected to input/output structure.
Promptly as shown in Figure 1, a kind of low pass filter based on helical wire comprises upper cover plate 1; Base 2, metal wire 4, metal cavitg 5; Insulating material 6, and at least three metallic plates 3 that are arranged in metal cavitg 5, said metallic plate 3 is connected by metal wire 4 and insulate with metal cavitg 5; Said metal cavitg 5 is arranged between upper cover plate 1 and the base 2, and shape of cross section is a rectangle.
The metallic plate 3 upper surface center parallel with metal wire 4 axis directions has a rectangular channel 8 that is parallel to metal wire 4 axis directions and extends to metallic plate 3 cross-section center; The width of rectangular channel 8 is than the big 0.05mm of diameter of metal wire 4, and rectangular channel 8 length equal the length of metallic plate 3 along metal wire 4 axis directions; Be that rectangular channel 8 length equal metallic plate 3 thickness, metal wire 4 is positioned over the trench bottom of rectangular channel 8 and contacts with rectangular channel 8 inwalls.
All metallic plates 3 are identical with the shape of cross section of metal wire 4 axis normal.
Upper cover plate 1 is provided with the tuning screw 7 that runs through upper cover plate 1 and extend into metal cavitg 5 inside, and tuning screw 7 is positioned at directly over the notch of rectangular channel 8.
Just can better realize the utility model as stated.
Claims (10)
1. low pass filter based on helical wire; Comprise the base (2) that is provided with metal cavitg (5); And be arranged on the cover plate (1) on the base (2), and at least three metallic plates (3) that are arranged in metal cavitg (5), it is characterized in that; Said metallic plate (3) links together through metal wire (4), and metallic plate (3) is through insulating material (6) and metal cavitg (5) insulation; Said metal wire (4) is a spirality between two adjacent metal plates (3).
2. a kind of low pass filter based on helical wire according to claim 1 is characterized in that said metal wire (4) is a column, and its shape of cross section is consistent along its axis.
3. a kind of low pass filter based on helical wire according to claim 2 is characterized in that, said metal wire (4) shape of cross section is circular.
4. a kind of low pass filter based on helical wire according to claim 2 is characterized in that, said metal wire (4) shape of cross section is a rectangle.
5. a kind of low pass filter based on helical wire according to claim 1 is characterized in that the shape of cross section of metal cavitg (5) is a rectangle; Said metallic plate (3) is a rectangle with the shape of cross section of metal wire (4) axis normal, and metallic plate (3) adopts insulating material (6) parcel with the surface of metal wire (4) parallel axes; Thickness≤the 0.15mm of insulating material (6), metallic plate (3) is a chamfering near two angles of metal cavitg (5) bottom, chamfer radius is less than or equal to 1/3 of metallic plate width.
6. a kind of low pass filter according to claim 1 based on helical wire; It is characterized in that; The upper surface that said metallic plate (3) is parallel to metal wire (4) axis direction has the rectangular channel (8) that extends to metallic plate (3) central point; The width of rectangular channel (8) is than the diameter big 0.01 to 1mm of metal wire (4), and rectangular channel (8) length equals the thickness of metallic plate (3); Metal wire (4) is positioned over the inside of rectangular channel (8) and contacts with rectangular channel (8) inwall.
7. a kind of low pass filter based on helical wire according to claim 6 is characterized in that, said metal wire (4) is positioned over the trench bottom of rectangular channel (8) and contacts with rectangular channel (8) inwall.
8. according to any described a kind of low pass filter among the claim 1-7, it is characterized in that all metallic plates (3) are identical with the cross sectional dimensions and the shape of metal wire (4) axis normal based on helical wire.
9. according to any described a kind of low pass filter among the claim 1-7 based on helical wire; It is characterized in that; Said upper cover plate (1) is provided with and runs through upper cover plate (1) and extend into the inner tuning screw (7) of metal cavitg (5), and tuning screw (7) is positioned at directly over the metallic plate (3).
10. according to any described a kind of low pass filter among the claim 1-7, it is characterized in that the two ends of the axis direction of said metal wire (4) are connected to input/output structure based on helical wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220096809 CN202474152U (en) | 2012-03-15 | 2012-03-15 | Low-pass filter based on helical metal wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220096809 CN202474152U (en) | 2012-03-15 | 2012-03-15 | Low-pass filter based on helical metal wire |
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| CN202474152U true CN202474152U (en) | 2012-10-03 |
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| CN 201220096809 Expired - Fee Related CN202474152U (en) | 2012-03-15 | 2012-03-15 | Low-pass filter based on helical metal wire |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311606A (en) * | 2012-03-15 | 2013-09-18 | 成都赛纳赛德科技有限公司 | Low-pass filter based on helical metal wire |
-
2012
- 2012-03-15 CN CN 201220096809 patent/CN202474152U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311606A (en) * | 2012-03-15 | 2013-09-18 | 成都赛纳赛德科技有限公司 | Low-pass filter based on helical metal wire |
| CN103311606B (en) * | 2012-03-15 | 2015-07-29 | 成都赛纳赛德科技有限公司 | A kind of low pass filter based on helical wire |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121003 Termination date: 20150315 |
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| EXPY | Termination of patent right or utility model |