CN202487727U - Low-pass filter based on nonuniform columnar metal - Google Patents
Low-pass filter based on nonuniform columnar metal Download PDFInfo
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- CN202487727U CN202487727U CN 201220096820 CN201220096820U CN202487727U CN 202487727 U CN202487727 U CN 202487727U CN 201220096820 CN201220096820 CN 201220096820 CN 201220096820 U CN201220096820 U CN 201220096820U CN 202487727 U CN202487727 U CN 202487727U
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- cylindrical metal
- homogeneous cylindrical
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- metallic plate
- pass filter
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Abstract
The utility model discloses a low-pass filter based on nonuniform columnar metal. The low-pass filter comprises a base with a metal cavity, and a cover plate arranged on the base, and further comprises nonuniform columnar metal and an insulating material, as well as at least three metal plates positioned in the metal cavity, wherein the metal plates are connected together through the nonuniform columnar metal and insulated from the metal cavity through the insulating material; and the cross section of the metal cavity is rectangular. The low-pass filter based on nonuniform columnar metal, provided by the utility model, has the advantages of simple structure, simplicity in processing, convenience in debugging and high pass-band cut-off frequency, and can be widely used in electronic systems of all microwave bands, particularly radar, missile guidance, communication and other military and civil fields.
Description
Technical field
The utility model relates to a kind of low pass filter based on non-homogeneous cylindrical metal, specifically, relates to a kind of low pass filter that utilizes non-homogeneous cylindrical metal, metallic plate and wire chamber 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: based on the low pass filter of non-homogeneous cylindrical metal, 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; It is characterized in that said metallic plate links together through non-homogeneous cylindrical metal, and metallic plate is through insulating material and metal cavitg insulation; There is variable in the cross section size of non-homogeneous cylindrical metal along its axis direction.
Said non-homogeneous cylindrical metal is that cross section is a rectangle.
Said non-homogeneous cylindrical metal is that cross section is circular.
The cross-sectional area difference that has the non-homogeneous cylindrical metal at metallic plate two ends at least.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 a rectangle; The shape of cross section of said metallic plate and non-homogeneous cylindrical metal axis normal is a rectangle, and wrapped with insulation, the thickness≤0.3mm of insulating material are adopted in the surface of metallic plate and non-homogeneous cylindrical metal parallel axes; Metallic plate is a 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 said metallic plate is parallel to non-homogeneous cylindrical metal axis direction has the rectangular channel that extends to the metallic plate central point; The width of rectangular channel is than the width big 0.01 to 0.5mm of non-homogeneous cylindrical metal in 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.
Said non-homogeneous cylindrical metal 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 non-homogeneous cylindrical metal axis normal, but metallic plate is different along the size of non-homogeneous cylindrical metal axis direction.
Said cover plate is provided with and runs through cover plate and extend into the inner tuning screw of metal cavitg, and tuning screw is positioned at directly over the metallic plate.
The two ends of the axis direction of said 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 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 non-homogeneous cylindrical metal that each metallic plate is linked together.
Said 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 the little change alternate of changing from small to big again greatly or is from large to small arranged; Based on this design, then can cause output impedance different because the cross section of non-homogeneous cylindrical metal is different.In order to export the impedance that height changes, so there is variable with the cross section size of non-homogeneous cylindrical metal in the utility model along its axis direction.Generally the cross section size design of non-homogeneous cylindrical metal is become along change from small to big the again from large to small form of alternate of its axis direction, the impedance that can export the alternate of better effects.
Metallic plate is a chamfering near two angles of metal cavitg bottom, makes things convenient for the fast and convenient insertion metal cavitg of metallic plate ability after the formation chamfering.
According to experimental data contrast, 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 big gradually along with reducing of insulation thickness; We are based on such experimental result; According to our conventional design, the general later stage for ease, we generally adopted the centre frequency of parasitic passband and the bigger design of ratio of cut-off frequecy of passband to the processing of ripple; The ratio of centre frequency and cut-off frequecy of passband that is parasitic passband is big more; We in later stage to the processing Vietnamese side of ripple just, 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 say something, in conjunction with following subordinate list 1 in further explanation.
Based on this table; We can draw following result, and when insulation thickness equaled 0.3mm, parasitic passband centre frequency (GHz) was 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), and when insulation thickness equaled 0.2mm, parasitic passband centre frequency (GHz) was 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), and 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 bigger and bigger with the ratio of cut-off frequecy of passband (GHz).When insulation thickness equaled 0.35mm, parasitic passband centre frequency (GHz) was 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, and 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 littler, and therefore, we know; When the parasitic passband centre frequency (GHz) and the ratio of cut-off frequecy of passband (GHz) were increasing, the signal processing 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 an optimum efficiency.
Therefore non-homogeneous cylindrical metal is positioned over the inside of rectangular channel and contacts with the rectangular channel inwall, can make that metallic plate is serially connected.
Said non-homogeneous cylindrical metal 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 non-homogeneous cylindrical metal axis normal, but different along the size of non-homogeneous cylindrical metal axis direction.
Said cover plate is provided with and runs through 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 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 utility model design; Comprise 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 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; Non-homogeneous cylindrical metal 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 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, 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 one.
Fig. 2 is that the A-A of the utility model embodiment one is to sketch map.
Fig. 3 is the longitudinal sectional drawing of the utility model embodiment two.
Fig. 4 is that the A-A of the utility model embodiment two is to sketch map.
Label is expressed as respectively among the figure: 1, 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 utility model is done to specify further, but the utility model execution mode is not limited thereto.
Like Fig. 1, shown in Figure 2; 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 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 non-homogeneous cylindrical metal 4, and metallic plate 3 is through 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.
Said non-homogeneous cylindrical metal 4 is a rectangle for cross section.
Said non-homogeneous cylindrical metal 4 is circular for cross section.
The cross-sectional area of the non-homogeneous cylindrical metal 4 between adjacent two metallic plates 3 is different.The cross-sectional area difference that has the non-homogeneous cylindrical metal at metallic plate two ends at least.
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 non-homogeneous cylindrical metal 4 axis normal, and metallic plate 3 adopts insulating material 6 parcels, the thickness≤0.3mm of insulating material 6 with the surface of non-homogeneous cylindrical metal 4 parallel axes; Metallic plate 3 is a 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 said 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 width of rectangular channel 8 is than the width big 0.01 to 0.5mm of non-homogeneous cylindrical metal 4 in 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.
Said non-homogeneous cylindrical metal 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 cross sectional dimensions and the shape of non-homogeneous cylindrical metal 4 axis normal, but metallic plate 3 is different along the size of non-homogeneous cylindrical metal 4 axis directions.
Said cover plate 1 is provided with the tuning screw 7 that runs through cover plate 1 and extend into metal cavitg 5 inside, and tuning screw 7 is positioned at directly over the metallic plate 3.
The two ends of the axis direction of said non-homogeneous cylindrical metal 4 are connected to input/output structure.
The utility model 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 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; Said metallic plate 3 links together through non-homogeneous cylindrical metal 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.Non-homogeneous cylindrical metal 4 is a 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.Metallic plate 3 is a rectangle with the shape of cross section of non-homogeneous cylindrical metal 4 axis normal, and metallic plate 3 adopts insulating material 6 parcels with the surface of non-homogeneous cylindrical metal 4 parallel axes; Metallic plate 3 is a 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, and the width of rectangular channel 8 is than the big 0.05mm of diameter of non-homogeneous cylindrical metal 4, and rectangular channel 8 length equal the thickness of metallic plate 3.
Size is different on the direction of metallic plate 3 and non-homogeneous cylindrical metal 4 parallel axes.
Promptly as shown in Figure 1, based on the low pass filter of non-homogeneous cylindrical metal, comprise 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, said metallic plate 3 is connected by non-homogeneous cylindrical metal 4 and insulate with metal cavitg 5; Said metal cavitg 5 is arranged between cover plate 1 and the base 2, and shape of cross section is a rectangle.
Non-homogeneous cylindrical metal 4 is the column that shape of cross section changes along its axis.
Non-homogeneous cylindrical metal 4 is that make up with metallic plate 3 the processing back separately.
All metallic plates 3 are identical with the shape of cross section of non-homogeneous cylindrical metal 4 axis normal.
Like Fig. 3, shown in 4, different with embodiment 1 is the not upper surface center rectangular channel 8 parallel with non-homogeneous cylindrical metal 4 axis directions of metallic plate 3, but directly that non-homogeneous cylindrical metal 4 is as a whole with metallic plate 3 processing.Tuning screw 7 be positioned at metallic plate 3 directly over.
Can well realize the utility model as stated.
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 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 non-homogeneous cylindrical metal (4), and metallic plate (3) is through 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 said non-homogeneous cylindrical metal (4) is a rectangle.
3. the low pass filter based on non-homogeneous cylindrical metal according to claim 1 is characterized in that, said non-homogeneous cylindrical metal (4) is circular 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 a rectangle; Said metallic plate (3) is a rectangle with the shape of cross section of non-homogeneous cylindrical metal (4) axis normal, and metallic plate (3) adopts insulating material (6) parcel, the thickness≤0.3mm of insulating material (6) with the surface of non-homogeneous cylindrical metal (4) parallel axes; Metallic plate (3) is a 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 said 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 width of rectangular channel (8) is than the width big 0.01 to 0.5mm of non-homogeneous cylindrical metal (4) in 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. according to any described low pass filter among the claim 1-6, it is characterized in that all metallic plates (3) are identical with the cross sectional dimensions and the shape of non-homogeneous cylindrical metal (4) axis normal based on non-homogeneous cylindrical metal.
8. according to any described low pass filter among the claim 1-6 based on non-homogeneous cylindrical metal; It is characterized in that; Said cover plate (1) is provided with and runs through 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).
9. according to any described low pass filter among the claim 1-6, it is characterized in that the two ends of the axis direction of said non-homogeneous cylindrical metal (4) are connected to input/output structure based on non-homogeneous cylindrical metal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220096820 CN202487727U (en) | 2012-03-15 | 2012-03-15 | Low-pass filter based on nonuniform columnar metal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220096820 CN202487727U (en) | 2012-03-15 | 2012-03-15 | Low-pass filter based on nonuniform columnar metal |
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| CN202487727U true CN202487727U (en) | 2012-10-10 |
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| CN 201220096820 Expired - Fee Related CN202487727U (en) | 2012-03-15 | 2012-03-15 | Low-pass filter based on nonuniform columnar metal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311608A (en) * | 2012-03-15 | 2013-09-18 | 成都赛纳赛德科技有限公司 | Low pass filter based on non-uniform columnar metal |
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2012
- 2012-03-15 CN CN 201220096820 patent/CN202487727U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311608A (en) * | 2012-03-15 | 2013-09-18 | 成都赛纳赛德科技有限公司 | Low pass filter based on non-uniform columnar metal |
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Legal Events
| 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: 20121010 Termination date: 20150315 |
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| EXPY | Termination of patent right or utility model |