CN103311608A - Low pass filter based on non-uniform columnar metal - Google Patents
Low pass filter based on non-uniform columnar metal Download PDFInfo
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- CN103311608A CN103311608A CN2012100678909A CN201210067890A CN103311608A CN 103311608 A CN103311608 A CN 103311608A CN 2012100678909 A CN2012100678909 A CN 2012100678909A CN 201210067890 A CN201210067890 A CN 201210067890A CN 103311608 A CN103311608 A CN 103311608A
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Abstract
The invention discloses a low pass filter based on a non-uniform columnar metal. The low pass filter comprises a base with a metal cavity and a cover plate which is arranged on the base, and further comprises the non-uniform columnar metal, an insulating material and at least three metal plates, wherein the at least three metal plates are arranged in the metal cavity and are connected by the non-uniform columnar metal, and the metal plates are insulated from the metal cavity through the insulating material; the cross section of the metal cavity is rectangular. The low pass filter disclosed by the invention has the advantages of simple structure and machining, convenience in debugging, high pass band cut-off frequency, can be widely applied to an electronic system of each microwave band, in particular to the military and civil fields, such as radar, missile guidance and communication.
Description
Technical field
The present invention relates to a kind of low pass filter based on non-homogeneous cylindrical metal, specifically, relate to a kind of low pass filter that utilizes non-homogeneous cylindrical metal, metallic plate and wire chamber to consist of.
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 of coaxial configuration inner wire that disk loads and change in the instantaneous impedance.The former has complex structure, requirement on machining accuracy is high, support is difficult, the transition frequency range suppresses precipitous not, debug the shortcomings such as difficult.The latter has the 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 not, 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 the transition frequency range suppress steepness to get to a certain extent improvement owing to introducing transmission zero.Simultaneously, because signal energy partly is distributed in the air, suspending also obtains the part solution with the high problem of the high-end Insertion Loss of line pass band.But still there are the 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 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 solution used in the present invention is as follows: based on the low pass filter of non-homogeneous cylindrical metal, comprise the base that is provided with metal cavitg, and be arranged on cover plate on the base, and at least three metallic plates that are arranged in metal cavitg, it is characterized in that, described metallic plate links together by non-homogeneous cylindrical metal, and metallic plate is by insulating material and metal cavitg insulation; There is variable in the cross section size of non-homogeneous cylindrical metal along its axis direction.
Described non-homogeneous cylindrical metal is that cross section is the rectangle column.
Described non-homogeneous cylindrical metal is that cross section is the circular cylindrical shape body.
The cross-sectional area of the non-homogeneous cylindrical metal between adjacent two metallic plates is different.
The shape of cross section of metal cavitg is rectangle; The shape of cross section that described metallic plate is vertical with non-homogeneous cylindrical metal axis is rectangle, and wrapped with insulation, the thickness≤0.3mm of insulating material are adopted in the metallic plate surface parallel with non-homogeneous cylindrical metal axis; Metallic plate is chamfering near two angles of metal cavitg bottom, and chamfer radius is less than or equal to 1/3 of metallic plate width.
The upper surface that described metallic plate is parallel to non-homogeneous cylindrical metal axis direction has the rectangular channel that extends to the metallic plate central point, the non-homogeneous cylindrical metal of the Width of rectangular channel is at the width large 0.01 to 0.5mm of same position, and rectangular channel length equals the thickness of metallic plate; Non-homogeneous cylindrical metal is positioned over the inside of rectangular channel and contacts with the rectangular channel inwall.
Described non-homogeneous cylindrical metal is positioned over the trench bottom of rectangular channel and contacts with the rectangular channel inwall.
Cross sectional dimensions and shape that all metallic plates and non-homogeneous cylindrical metal axis are vertical are identical, but metallic plate is different along the size of non-homogeneous cylindrical metal axis direction.
Be provided with the tuning screw that runs through upper cover plate and extend into metal cavitg inside on the described upper cover plate, tuning screw is positioned at directly over the metallic plate.
The two ends of the axis direction of described non-homogeneous cylindrical metal are connected to input/output structure.
In order to form filter function, metallic plate and metal cavitg will form insulation, generally adopt the unsettled metallic plate that arranges of medium, but in order to reduce the volume of filter, so metallic plate insulate by insulating material and metal cavitg.Process in order to form the series connection signal, therefore use non-homogeneous cylindrical metal that each metallic plate is linked together.
Described non-homogeneous cylindrical metal is the column along the cross section variable size of axis direction.There is variable in the cross section size that is non-homogeneous cylindrical metal along its axis direction.As with the cross section size of non-homogeneous cylindrical metal along the descending variation of its axis direction or little change is arranged change from small to big again greatly or from large to small and alternately change; Based on this design, then can cause output impedance different because the cross section of non-homogeneous cylindrical metal is different.The impedance that changes in order to export height, so there is variable with the cross section size of non-homogeneous cylindrical metal in the present invention along its axis direction.Generally the cross section size design with non-homogeneous cylindrical metal becomes the form of changing from small to big from large to small again and alternately changing along its axis direction, can export the impedance that alternately changes of better effects.
Metallic plate is chamfering near two angles of metal cavitg bottom, makes things convenient for the fast and convenient insertion metal cavitg of metallic plate energy after the formation chamfering.
Contrast according to experimental data, when the thickness of insulating material≤0.3mm, the centre frequency of parasitic passband and the ratio of cut-off frequecy of passband can become large gradually along with reducing of insulation thickness, we are based on such experimental result, according to our conventional design, general in order to make things convenient for the later stage to the processing of ripple, we generally adopt the larger design of the ratio of the centre frequency of parasitic passband and cut-off frequecy of passband, the ratio that is the centre frequency of parasitic passband and cut-off frequecy of passband is larger, we to the processing Vietnamese side of ripple just in later stage, therefore based on the basis of above-mentioned principle and design, we the thickness of the insulating material of this design generally≤0.3mm.In order effectively to describe the problem, in conjunction with following subordinate list 1 in further instruction.
Based on this table, we can draw following result, when insulation thickness equals 0.3mm, parasitic passband centre frequency (GHz) is about 3.6 with the ratio of cut-off frequecy of passband (GHz), when insulation thickness equals 0.25mm, parasitic passband centre frequency (GHz) is about 4.6 with the ratio of cut-off frequecy of passband (GHz), when insulation thickness equals 0.2mm, parasitic passband centre frequency (GHz) is about 5.1 with the ratio of cut-off frequecy of passband (GHz), when insulation thickness equals 0.15mm, parasitic passband centre frequency (GHz) is about 6 with the ratio of cut-off frequecy of passband (GHz), when insulation thickness equaled 0.1mm, parasitic passband centre frequency (GHz) was about 7 with the ratio of cut-off frequecy of passband (GHz); Based on this result of calculation, we analyze and draw, and after insulation thickness≤0.3mm, parasitic passband centre frequency (GHz) becomes larger and larger with the ratio of cut-off frequecy of passband (GHz).When insulation thickness equals 0.35mm, parasitic passband centre frequency (GHz) is about 3 with the ratio of cut-off frequecy of passband (GHz), when insulation thickness equals 0.4mm, parasitic passband centre frequency (GHz) is about 2.9 with the ratio of cut-off frequecy of passband (GHz), therefore, after insulation thickness is greater than 0.3mm, the ratio of parasitic passband centre frequency (GHz) and cut-off frequecy of passband (GHz) more and more levels off to plateau, its ratio is also more and more less, therefore, we know, when parasitic passband centre frequency (GHz) and the ratio of cut-off frequecy of passband (GHz) were increasing, the signal treatment effect of filter also can be become better and better.
Our structural test draws simultaneously, after insulation thickness is greater than 0.3mm, can produce increasing fluctuation, produces increasing burr, and this phenomenon is extremely unfavorable to the filter effect of filter.
Therefore, we select with the Thickness Design of insulating material for≤0.3mm is optimum efficiency.
Therefore non-homogeneous cylindrical metal is positioned over the inside of rectangular channel and contacts with the rectangular channel inwall, can so that metallic plate be serially connected.
Described non-homogeneous cylindrical metal is positioned over the trench bottom of rectangular channel and contacts with the rectangular channel inwall.
Cross sectional dimensions and shape that all metallic plates and non-homogeneous cylindrical metal axis are vertical are identical, but different along the size of non-homogeneous cylindrical metal axis direction.
Be provided with the tuning screw that runs through upper cover plate and extend into metal cavitg inside on the described upper cover plate, 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 described non-homogeneous cylindrical metal are connected to input/output structure.
Input/output structure adopts existing coaxial input/output structure.
Based on foregoing: the low pass filter based on non-homogeneous cylindrical metal of the present invention's design, comprise upper cover plate, base, non-homogeneous cylindrical metal, metal cavitg, insulating material, and at least three metallic plates that are arranged in metal cavitg, metallic plate is connected by non-homogeneous cylindrical metal and insulate with metal cavitg; And metallic plate is perpendicular to the bottom surface, chamber of metal cavitg.
In addition, tuning screw preferentially is arranged on directly over the notch of rectangular channel.
The operation principle of low pass filter can be described below.
Periodic loading capacitance can be realized low pass filter on an inner wire, the metallic plate that adds in the conductor is the equal of electric capacity in parallel on transmission line, non-homogeneous cylindrical metal between the two liang of metallic plates inductance that partly is equivalent to connect, so the formation of equivalence a simple LC filter circuit, when signal is propagated along non-homogeneous cylindrical metal, 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, unwanted high frequency signal attenuation obtains the low pass filter of desired parameters with this.
The invention has the advantages that the low pass filter that a kind of structure processing is simple, debugging is convenient, cut-off frequecy of passband is high.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 the civil areas such as radar, missile guidance, communication.
Description of drawings
Fig. 1 is the longitudinal sectional drawing of the embodiment of the invention one.
Fig. 2 is that the A-A of the embodiment of the invention one is to schematic diagram.
Fig. 3 is the longitudinal sectional drawing of the embodiment of the invention two.
Fig. 4 is that the A-A of the embodiment of the invention two is to schematic diagram.
Number in the figure is expressed as respectively: 1, upper cover plate; 2, base; 3, metallic plate; 4, non-homogeneous cylindrical metal; 5, metal cavitg; 6, insulating material; 7, tuning screw; 8, rectangular channel.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail, but embodiment of the present invention is not limited to this.
As shown in Figure 1 and Figure 2, low pass filter based on non-homogeneous cylindrical metal, comprise the base 2 that is provided with metal cavitg 5, and be arranged on 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, described metallic plate 3 links together by non-homogeneous cylindrical metal 4, and metallic plate 3 is by insulating material 6 and metal cavitg 5 insulation; There is variable in the cross section size of non-homogeneous cylindrical metal 4 along its axis direction.
Described non-homogeneous cylindrical metal 4 is the rectangle column for cross section.
Described non-homogeneous cylindrical metal 4 is the circular cylindrical shape body for cross section.
The cross-sectional area of the non-homogeneous cylindrical metal 4 between adjacent two metallic plates 3 is different.
The shape of cross section of metal cavitg 5 is rectangle; The shape of cross section that described metallic plate 3 is vertical with non-homogeneous cylindrical metal 4 axis is rectangle, and insulating material 6 parcels, the thickness≤0.3mm of insulating material 6 are adopted in metallic plate 3 surface parallel with non-homogeneous cylindrical metal 4 axis; Metallic plate 3 is chamfering near two angles of metal cavitg 5 bottoms, and chamfer radius is less than or equal to 1/3 of metallic plate width.
The upper surface that described metallic plate 3 is parallel to non-homogeneous cylindrical metal 4 axis directions has the rectangular channel 8 that extends to metallic plate 3 central points, the non-homogeneous cylindrical metal 4 of the Width of rectangular channel 8 is at the width large 0.01 to 0.5mm of same position, and rectangular channel 8 length equal the thickness of metallic plate 3; Non-homogeneous cylindrical metal 4 is positioned over the inside of rectangular channel 8 and contacts with rectangular channel 8 inwalls.
Described non-homogeneous cylindrical metal 4 is positioned over the trench bottom of rectangular channel 8 and contacts with rectangular channel 8 inwalls.
Cross sectional dimensions and shape that all metallic plates 3 and non-homogeneous cylindrical metal 4 axis are vertical are identical, but metallic plate 3 is different along the size of non-homogeneous cylindrical metal 4 axis directions.
Be provided with the tuning screw 7 that runs through upper cover plate 1 and extend into metal cavitg 5 inside on the described upper cover plate 1, tuning screw 7 is positioned at directly over the metallic plate 3.
The two ends of the axis direction of described non-homogeneous cylindrical metal 4 are connected to input/output structure.
The present invention includes the base 2 that is provided with metal cavitg 5, and be arranged on cover plate 1 on the base 2, also comprise non-homogeneous cylindrical metal 4 and insulating material 6, and at least three metallic plates 3 that are arranged in metal cavitg 5, it is characterized in that, described metallic plate 3 links together by non-homogeneous cylindrical metal 4, and metallic plate 3 is by insulating material 6 and metal cavitg 5 insulation; The shape of cross section of metal cavitg 5 is rectangle.Non-homogeneous cylindrical metal 4 is column, and its shape of cross section is along its axis direction variable size.
Non-homogeneous cylindrical metal 4 shape of cross sections are rectangle.The shape of cross section that metallic plate 3 is vertical with non-homogeneous cylindrical metal 4 axis is rectangle, and insulating material 6 parcels are adopted on metallic plate 3 surface parallel with non-homogeneous cylindrical metal 4 axis; Metallic plate 3 is chamfering near two angles of metal cavitg 5 bottoms, and chamfer radius is less than or equal to 1/3 of metallic plate width.
The upper surface that metallic plate 3 is parallel to non-homogeneous cylindrical metal 4 axis directions has the rectangular channel 8 that extends to metallic plate 3 central points, the large 0.05mm of diameter of the non-homogeneous cylindrical metal 4 of the Width of rectangular channel 8, and rectangular channel 8 length equal the thickness of metallic plate 3.
Cross sectional dimensions and shape that metallic plate 3 and non-homogeneous cylindrical metal 4 axis are vertical are identical.
Be provided with the tuning screw 7 that runs through upper cover plate 1 and extend into metal cavitg 5 inside on the upper cover plate 1, the two ends of the axis direction of non-homogeneous cylindrical metal 4 are connected to input/output structure.
Namely as shown in Figure 1, low pass filter based on non-homogeneous cylindrical metal, comprise upper cover plate 1, base 2, non-homogeneous cylindrical metal 4, metal cavitg 5, insulating material 6, and at least three metallic plates 3 that are arranged in metal cavitg 5, described metallic plate 3 is connected by non-homogeneous cylindrical metal 4 and insulate with metal cavitg 5; Described metal cavitg 5 is arranged between upper cover plate 1 and the base 2, and shape of cross section is rectangle.
Non-homogeneous cylindrical metal 4 is the column that shape of cross section changes along its axis.
Non-homogeneous cylindrical metal 4 is after the separately processing and metallic plate 3 combinations.
The shape of cross section that metallic plate 3 is vertical with non-homogeneous cylindrical metal 4 axis is rectangle, parallel with the non-homogeneous cylindrical metal 4 axis insulating material 6 that is coated with; Metallic plate 3 is positioned at two angle chamferings of bottom perpendicular to the plane of non-homogeneous cylindrical metal 4 axis, chamfering is the part of column, and the axis of this column is parallel with non-homogeneous cylindrical metal 4 axis, and chamfer radius is less than or equal to 1/3 of metallic plate width.
The metallic plate 3 upper surface center parallel with non-homogeneous cylindrical metal 4 axis directions has a rectangular channel 8 that is parallel to non-homogeneous cylindrical metal 4 axis directions and extends to metallic plate 3 cross-section center, the large 0.05mm of diameter of the non-homogeneous cylindrical metal 4 of the Width of rectangular channel 8, rectangular channel 8 length equal metallic plate 3 along the length of non-homogeneous cylindrical metal 4 axis directions; Be that rectangular channel 8 length equal metallic plate 3 thickness, non-homogeneous cylindrical metal 4 is positioned over the trench bottom of rectangular channel 8 and contacts with rectangular channel 8 inwalls.
The shape of cross section that all metallic plates 3 and non-homogeneous cylindrical metal 4 axis are vertical is identical.
Be provided with the tuning screw 7 that runs through upper cover plate 1 and extend into metal cavitg 5 inside on the upper cover plate 1, tuning screw 7 is positioned at directly over the notch of rectangular channel 8.
Shown in Fig. 3,4, the upper surface center rectangular channel 8 that different from embodiment 1 is metallic plate 3 is not parallel with non-homogeneous cylindrical metal 4 axis directions, but directly that non-homogeneous cylindrical metal 4 and metallic plate 3 processing is as a whole.Tuning screw 7 be positioned at metallic plate 3 directly over.
Can well realize the present invention as mentioned above.
Claims (9)
1. based on the low pass filter of non-homogeneous cylindrical metal, comprise the base (2) that is provided with metal cavitg (5), and be arranged on 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, described metallic plate (3) links together by non-homogeneous cylindrical metal (4), and metallic plate (3) is by insulating material (6) and metal cavitg (5) insulation.
2. the low pass filter based on non-homogeneous cylindrical metal according to claim 1 is characterized in that, the cross section of described non-homogeneous cylindrical metal (4) is the rectangle column.
3. the low pass filter based on non-homogeneous cylindrical metal according to claim 1 is characterized in that, described non-homogeneous cylindrical metal (4) is the circular cylindrical shape body for cross section.
4. the low pass filter based on non-homogeneous cylindrical metal according to claim 1 is characterized in that, has the cross-sectional area difference of the non-homogeneous cylindrical metal (4) at a metallic plate (3) two ends at least.
5. the low pass filter based on non-homogeneous cylindrical metal according to claim 1 is characterized in that, the shape of cross section of metal cavitg (5) is rectangle; The shape of cross section that described metallic plate (3) is vertical with non-homogeneous cylindrical metal (4) axis is rectangle, and insulating material (6) parcel, the thickness≤0.3mm of insulating material (6) are adopted in metallic plate (3) surface parallel with non-homogeneous cylindrical metal (4) axis; Metallic plate (3) is chamfering near two angles of metal cavitg (5) bottom, and chamfer radius is less than or equal to 1/3 of metallic plate width.
6. the low pass filter based on non-homogeneous cylindrical metal according to claim 1, it is characterized in that, the upper surface that described metallic plate (3) is parallel to non-homogeneous cylindrical metal (4) axis direction has the rectangular channel (8) that extends to metallic plate (3) central point, the non-homogeneous cylindrical metal of Width (4) of rectangular channel (8) is at the width large 0.01 to 0.5mm of same position, and rectangular channel (8) length equals the thickness of metallic plate (3); Non-homogeneous cylindrical metal (4) is positioned over the inside of rectangular channel (8) and contacts with rectangular channel (8) inwall.
7. the described low pass filter based on non-homogeneous cylindrical metal of any one is characterized in that according to claim 1-6, and cross sectional dimensions and shape that all metallic plates (3) and non-homogeneous cylindrical metal (4) axis are vertical are identical.
8. the described low pass filter based on non-homogeneous cylindrical metal of any one according to claim 1-6, it is characterized in that, be provided with on the described upper cover plate (1) and run through upper cover plate (1) and extend into the inner tuning screw (7) of metal cavitg (5), tuning screw (7) is positioned at directly over the metallic plate (3).
9. the described low pass filter based on non-homogeneous cylindrical metal of any one is characterized in that according to claim 1-6, and the two ends of the axis direction of described non-homogeneous cylindrical metal (4) are connected to input/output structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100678909A CN103311608A (en) | 2012-03-15 | 2012-03-15 | Low pass filter based on non-uniform columnar metal |
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| CN2012100678909A CN103311608A (en) | 2012-03-15 | 2012-03-15 | Low pass filter based on non-uniform columnar metal |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001332904A (en) * | 2000-05-24 | 2001-11-30 | Nec Corp | Filter structure |
| US20030001697A1 (en) * | 2001-06-20 | 2003-01-02 | The Boeing Company | Resonance suppressed stepped-impedance low pass filter and associated method of fabrication |
| CN101656336A (en) * | 2009-08-17 | 2010-02-24 | 成都赛纳赛德科技有限公司 | Modular wave filter |
| CN201829592U (en) * | 2010-10-09 | 2011-05-11 | 摩比天线技术（深圳）有限公司 | Low-pass filter |
| CN202487727U (en) * | 2012-03-15 | 2012-10-10 | 成都赛纳赛德科技有限公司 | Low-pass filter based on nonuniform columnar metal |
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2012
- 2012-03-15 CN CN2012100678909A patent/CN103311608A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001332904A (en) * | 2000-05-24 | 2001-11-30 | Nec Corp | Filter structure |
| US20030001697A1 (en) * | 2001-06-20 | 2003-01-02 | The Boeing Company | Resonance suppressed stepped-impedance low pass filter and associated method of fabrication |
| CN101656336A (en) * | 2009-08-17 | 2010-02-24 | 成都赛纳赛德科技有限公司 | Modular wave filter |
| CN201829592U (en) * | 2010-10-09 | 2011-05-11 | 摩比天线技术（深圳）有限公司 | Low-pass filter |
| CN202487727U (en) * | 2012-03-15 | 2012-10-10 | 成都赛纳赛德科技有限公司 | Low-pass filter based on nonuniform columnar metal |
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Application publication date: 20130918 |