CN202474151U - Low pass filter with variable cavity width - Google Patents
Low pass filter with variable cavity width Download PDFInfo
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- CN202474151U CN202474151U CN 201220096808 CN201220096808U CN202474151U CN 202474151 U CN202474151 U CN 202474151U CN 201220096808 CN201220096808 CN 201220096808 CN 201220096808 U CN201220096808 U CN 201220096808U CN 202474151 U CN202474151 U CN 202474151U
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- metal wire
- pass filter
- low pass
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- metallic plate
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Abstract
The utility model discloses a low pass filter with variable cavity width, which comprises a base provided with a metal hollow cavity and a cover plate arranged on the base, wherein the low pass filter further comprises a metal wire, an insulating material and at least three metal plates located in the metal hollow cavity, the metal plates are connected together through the metal wire, and the metal plates are insulated with the metal hollow cavity through the insulating material; and the cross section of the metal hollow cavity is rectangular, the shape of the cross section of the inner side wall of the metal hollow cavity is a rectangular wave, and the two end faces of the metal plates are arranged in the wave crests of the rectangular wave. The low pass filter disclosed by the utility model has the advantages of simple structure and processing, convenience in debugging and high passband disconnecting frequency. The low pass filter disclosed by the utility model can be extensively applied in electronic systems of various microwave bands and especially in such military and civil fields as radar, missile guidance and communication.
Description
Technical field
The utility model relates to the low pass filter that a kind of housing width changes, and 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: the low pass filter that a kind of housing width changes; 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; The cross section of metal cavitg madial wall is rectangular wavy, and the both ends of the surface of metallic plate are arranged in the crest of square wave.
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.The cross section of metal cavitg madial wall is rectangular wavy, and the both ends of the surface of metallic plate are arranged in the crest of square wave; Based on geometry, can effectively in unit plane, increase the cavity volume of the middle metal cavitg 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 cavity volume of metal cavitg is appointed so can reach predetermined design.
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.
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: the low pass filter that a kind of housing width of the utility model design changes 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 cross sectional representation 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 cross sectional representation of the utility model embodiment two.
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 1
Like Fig. 1, shown in Figure 2, the low pass filter that a kind of housing width changes 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; As shown in Figure 2, the cross section of metal cavitg 5 madial walls is rectangular wavy, and the both ends of the surface of metallic plate 3 are arranged in the crest of square wave.
Metal wire 4 shape of cross sections are circular.Metal wire 4 shape of cross sections are rectangle.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 parcels with the surface of metal wire 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 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.
Low pass filter promptly as shown in Figure 1, that a kind of housing width changes 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.
Metal wire 4 is a column, and its shape of cross section does not change along its axis; Metal wire 4 is buied from market for existing material.
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.
Like Fig. 3, shown in 4, different with embodiment 1 is the not upper surface center rectangular channel 8 parallel with metal wire 4 axis directions of metallic plate 3, but directly on metallic plate 3, offers the through hole that can make that metal wire 4 passes.Tuning screw 7 be positioned at metallic plate 3 directly over.
Can well realize the utility model as stated.
Claims (10)
1. the low pass filter that changes of a housing width; 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; The cross section of metal cavitg (5) madial wall is rectangular wavy, and the both ends of the surface of metallic plate (3) are arranged in the crest of square wave.
2. the low pass filter that a kind of housing width according to claim 1 changes is characterized in that said metal wire (4) is a column, and its shape of cross section is consistent along its axis.
3. the low pass filter that a kind of housing width according to claim 2 changes is characterized in that, said metal wire (4) shape of cross section is circular.
4. the low pass filter that a kind of housing width according to claim 2 changes is characterized in that said metal wire (4) shape of cross section is a rectangle.
5. the low pass filter that a kind of housing width according to claim 1 changes 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. the low pass filter that a kind of housing width according to claim 1 changes; 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 big 0.05mm of diameter 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. the low pass filter that a kind of housing width according to claim 6 changes 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 low pass filter that described a kind of housing width changes 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.
9. according to any low pass filter that described a kind of housing width changes among the claim 1-7; 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 low pass filter that described a kind of housing width changes 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220096808 CN202474151U (en) | 2012-03-15 | 2012-03-15 | Low pass filter with variable cavity width |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220096808 CN202474151U (en) | 2012-03-15 | 2012-03-15 | Low pass filter with variable cavity width |
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| Publication Number | Publication Date |
|---|---|
| CN202474151U true CN202474151U (en) | 2012-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220096808 Expired - Fee Related CN202474151U (en) | 2012-03-15 | 2012-03-15 | Low pass filter with variable cavity width |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202474151U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311607A (en) * | 2012-03-15 | 2013-09-18 | 成都赛纳赛德科技有限公司 | Low-pass filter with changeable cavity width |
| DE102014017155A1 (en) * | 2014-11-20 | 2016-05-25 | Kathrein-Austria Ges.M.B.H. | High-frequency conductor system with several chambers |
-
2012
- 2012-03-15 CN CN 201220096808 patent/CN202474151U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311607A (en) * | 2012-03-15 | 2013-09-18 | 成都赛纳赛德科技有限公司 | Low-pass filter with changeable cavity width |
| DE102014017155A1 (en) * | 2014-11-20 | 2016-05-25 | Kathrein-Austria Ges.M.B.H. | High-frequency conductor system with several chambers |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |
|
| EXPY | Termination of patent right or utility model |