CN202444041U - High-pass strip line filter based on spiral stub - Google Patents
High-pass strip line filter based on spiral stub Download PDFInfo
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- CN202444041U CN202444041U CN 201220096824 CN201220096824U CN202444041U CN 202444041 U CN202444041 U CN 202444041U CN 201220096824 CN201220096824 CN 201220096824 CN 201220096824 U CN201220096824 U CN 201220096824U CN 202444041 U CN202444041 U CN 202444041U
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Abstract
The utility model discloses a high-pass strip line filter based on a spiral stub. The high-pass strip line filter comprises a transmission line and at least two shorting stubs, the transmission line comprises an inner conductor and a metal cavity, and each shorting stub comprises a stub inner conductor and a stub cavity. The high-pass strip line filter has the advantages of simplicity in processing, low processing cost and convenience in debugging, can be widely used for electronic systems with various microwave bands, and is particularly used for the field of military and civil use such as radar, missile guidance and communication.
Description
Technical field
The utility model relates to filter, specifically, relates to a kind of high pass filter that utilizes band line and short branch to constitute.
Background technology
Microwave filter is the vitals in the microwave circuit system, also is the highest microwave passive component of technology content, and it mainly acts on is the extraction that is used for signal, separates, and suppresses to disturb.The application of microwave filter very extensively comprises radio communication, navigation, remote measurement etc.The microwave high pass filter is that a kind of permission high-frequency signal passes through, and suppresses the microwave passive component of low frequency signal.Because the filter construction under microwave frequency generally all has periodic frequency response, so there is not desirable high-pass filter response, the broadband band-pass filter under microwave frequency band can be used as high pass filter, promptly counterfeit high pass filter usually.Common high pass filter has coaxial configuration, but the high pass filter of this structure will obtain very high cut-off frequency, and structure just must be very little, and is very high to requirement on machining accuracy, and lamped element is arranged, and is not suitable for the frequency condition with higher.The bandwidth of parallel coupled line structure is narrow.The microstrip coupled line structure of quarter-wave is simple, but there is radiation loss in microstrip filter, and it is bigger to insert loss ratio.The transmission zero of waveguide resonant cavity resonant diaphragm structure is easy to realize, therefore seldom resonant cavity just can realize that very high band suppresses outward, and therefore this filter volume is little, compact conformation, but complex design, and machining accuracy is high, the cost height.
The utility model content
The purpose of the utility model is to provide a kind of simple, debugging convenience, compact conformation, band line high pass filter that cost is low processed.
For achieving the above object; The technical scheme that the utility model adopts is: a kind of band line high pass filter based on the spiral detail; At least two short branch that comprise transmission line and be connected with transmission line; Said transmission line is mainly by metal cavitg and be arranged on the inner inner wire of metal cavitg and constitute, and said short branch mainly is made up of detail cavity and the detail inner wire that is arranged on the detail cavity inside, and said adjacent short branch is positioned at the one or both sides of metal cavitg; The detail inner wire bends to spirality, and the axis normal of detail inner wire is in the axis of inner wire, and the cross-sectional area of detail inner wire is less than the cross-sectional area of inner wire.
Said adjacent short branch is positioned at the one or both sides of metal cavitg, and such minimizing filter occupation space of arranging favourable is carried out miniaturization Design effectively.The cross-sectional area of detail inner wire is less than the cross-sectional area of inner wire, and what promptly above-mentioned detail inner wire adopted is the conductor material of fine rule structure, and its material is cheap, can practice thrift processing cost.Can increase simultaneously the interior detail inner wire of unit are and be connected the number on the transmission line.Adopt the detail inner wire of such fine rule type, can increase the ratio of short branch characteristic impedance and line characteristic impedance to a great extent, thereby expand the bandwidth of filter.
In order effectively filter to be carried out miniaturization Design, the utility model is designed to spirality with the detail inner wire, and like this, the volume of spiral detail inner wire in unit space can reduce a lot.Inner wire is a serpentine; Inner wire is consistent in shape of cross section and the size perpendicular to the inner wire axis direction, and metal cavitg is consistent in shape of cross section and the size perpendicular to the inner wire axis direction; The detail inner wire is consistent in shape of cross section and the size perpendicular to detail inner wire axis direction, and the detail cavity is consistent perpendicular to the shape of cross section and the size of detail inner wire axis direction.
The cross section of the cross section of above-mentioned inner wire, the cross section of metal cavitg, detail inner wire, the cross section of detail cavity all are consistent on axis direction separately, can conveniently when processing, make things convenient for the milling processing.
The axis of all short branch and the axis of transmission line are positioned at same plane.Arranging like this reduced the filter occupation space, effectively carries out miniaturization Design.
The shape of cross section of inner wire is a rectangle; The parallel axes of said metal cavitg is in the axis direction of inner wire, and the shape of cross section of metal cavitg is a rectangle; Said inner wire and the insulation of metal cavitg inwall.Said inner wire perpendicular to the spacing of inner wire axis direction and metal cavitg inwall less than 1/5 of the size of metal cavitg on this direction.Can reduce the characteristic impedance of transmission line like this, thereby increase the ratio of short branch characteristic impedance and line characteristic impedance to a great extent, expand the bandwidth of filter.
The axis normal of detail inner wire is in the axis direction of inner wire, and the shape of cross section of detail inner wire is a rectangle; The parallel axes of said detail cavity is in the axis direction of detail inner wire.
Said detail cavity is provided with an openend, and openend also is connected with metal cavitg; And an end of said detail inner wire is connected with inner wire, and the detail inner wire is connected with the detail cavity inner wall away from an end of inner wire; Said detail inner wire insulate with the detail cavity inner wall being parallel on the direction of its axis.
Also comprise and outside the detail cavity, run through the tuning screw that stretches in the detail cavity, tuning screw is positioned at directly over the detail inner wire; And tuning screw extends between interior end of detail cavity and the detail inner wire and has the gap, and the length that tuning screw stretches into is regulated outside the detail cavity and is fixing.
Also comprise and outside metal cavitg, stretch into the inner coupling screw A of metal cavitg, coupling screw A places inner wire and detail inner wire junction, and is positioned at directly over the inner wire; Said coupling screw A extends between inner end of metal cavitg and the inner wire and has the gap, and the length that coupling screw A stretches into is regulated outside metal cavitg and is fixing.
Also comprise and outside metal cavitg, stretch into the inner coupling screw B of metal cavitg, mate screw B between adjacent two short branch, and be positioned at directly over the inner wire; Said coupling screw B extends between inner end of metal cavitg and the inner wire and has the gap, and the length that coupling screw B stretches into is regulated outside metal cavitg and is fixing.
Can find out that from foregoing a kind of band line high pass filter based on the helix detail of the utility model comprises transmission line and at least two short branch of connecting extraneous and high pass filter or being connected short branch in the high pass filter.Said transmission line is made up of inner wire and metal cavitg; Short branch is made up of detail inner wire and detail cavity; The shape of cross section of inner wire is a rectangle, can become serpentine at the plane inner bending at short branch place, can pass through the line cutting processing like this; The detail inner wire is the thin wire that can buy on the market, thereby has reduced the cost of filter.All detail inner wires measure-alike, inner wire and detail inner wire just can reduce cost through line cutting time processing like this; Detail cavity measure-alike reduced the requirement to machining accuracy.
Inner wire bends to serpentine, can realize the miniaturization of filter in the physical length that shortens under the situation that does not reduce electrical length between the short branch like this.
The detail cavity is provided with tuning screw away from an end of opening, and the length that said tuning screw stretches into the detail cavity can change outside the detail cavity.Can change the electrical length of detail inner wire like this through the length that tuning screw stretches into the detail cavity, realize the tuning of filter.
Be provided with coupling tuning screw A in inner wire and detail inner wire junction, and coupling tuning screw A is positioned at directly over the inner wire, the length that said coupling tuning screw A stretches into metal cavitg can change outside metal cavitg.Can the discontinuity that short branch causes be compensated like this, thereby realize the tuning of filter, obtain better passband reflection.
Between inner wire and detail inner wire junction, be provided with coupling tuning screw B, and coupling tuning screw B is positioned at directly over the inner wire, the length that said coupling tuning screw B stretches into metal cavitg can change outside metal cavitg.The length that stretches into metal cavitg through adjustment tuning screw B like this changes the electrical length between the short branch, has shortened the distance between the short branch, helps realizing the miniaturization of high pass filter.
The operation principle of band line high pass filter can be narrated as follows:
At first, electromagnetic wave signal is input to the inner wire and along inner wire from an end of inner wire and transmits.When electromagnetic wave signal ran into any short branch, electromagnetic wave was assigned with, and a part continues to propagate along inner wire, and another part is reflected.In certain frequency, cancelled out each other by the electromagnetic wave signal that all short branch reflect, theirs and be zero, all along the inner wire transmission, then this frequency is in the passband of high pass filter most of signal of this frequency.In certain frequency, by the signal mutual superposition that all short branch reflect, most of signal of this frequency is reflected, and then this frequency is in the stopband of high pass filter.Each short branch has played that signal passes through in the prevention stopband like this, lets the effect that the signal in the passband passes through that is in.
The advantage of the utility model is that processing is simple, debugging is convenient, compact conformation, and cost is low.The band line high 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 positioned at the vertical view of metal cavitg one side for adjacent short branch among the utility model embodiment one.
Fig. 2 is an A-A profile among the utility model embodiment one.
Fig. 3 is an end view among the utility model embodiment one.
Fig. 4 is positioned at the vertical view of metal cavitg both sides for adjacent short branch among the utility model embodiment two.
Fig. 5 is a B-B profile among the utility model embodiment two.
Fig. 6 bends to the vertical view that serpentine and short branch are positioned at metal cavitg one side for inner wire among the utility model embodiment three.
Fig. 7 is a C-C profile among the utility model embodiment three.
Fig. 8 bends to the vertical view that serpentine and adjacent short branch are positioned at the metal cavitg both sides for inner wire among the utility model embodiment four.
Fig. 9 is a D-D profile among the utility model embodiment four.
Label among the figure is expressed as respectively: 1, inner wire; 2, metal cavitg; 3, detail inner wire; 4, detail cavity; 5, tuning screw; 6, coupling screw A; 7, coupling screw B.
Embodiment
Below in conjunction with embodiment the utility model is done to specify further, but the execution mode of the utility model is not limited thereto.
Embodiment one
Like Fig. 1; Shown in 2,3, a kind of band line high pass filter based on the spiral detail; At least two short branch that comprise transmission line and be connected with transmission line; Said transmission line is mainly by metal cavitg 2 and be arranged on the inner inner wires 1 of metal cavitg 2 and constitute, and said short branch is mainly by detail cavity 4 and be arranged on detail cavity 4 inner detail inner wires 3 and constitute, and said adjacent short branch is positioned at a side of metal cavitg 2; Detail inner wire 3 bends to spirality, and the axis normal of detail inner wire 3 is in the axis of inner wire 1, and the cross-sectional area of detail inner wire 3 is less than the cross-sectional area of inner wire 1.
Said adjacent short branch is positioned at the one or both sides of metal cavitg, and such minimizing filter occupation space of arranging favourable is effectively carried out miniaturization Design.
In order effectively filter to be carried out miniaturization Design, the utility model is incited somebody to action, and detail inner wire 3 is designed to spirality, and like this, the volume of spiral detail inner wire 3 in unit space can reduce a lot.
The axis of all short branch and the axis of transmission line are positioned at same plane.
The shape of cross section of inner wire 1 is a rectangle; The parallel axes of said metal cavitg 2 is in the axis direction of inner wire 1, and the shape of cross section of metal cavitg 2 is a rectangle; Said inner wire 1 and the insulation of metal cavitg 2 inwalls.
The axis normal of detail inner wire 3 is in the axis direction of inner wire 1, and the shape of cross section of detail inner wire 3 is a rectangle; The parallel axes of said detail cavity 4 is in the axis direction of detail inner wire 3.
Said detail cavity 4 is provided with an openend, and openend also is connected with metal cavitg 2; And an end of said detail inner wire 3 is connected with inner wire 1, and detail inner wire 3 is connected with detail cavity 4 inwalls away from an end of inner wire 1; Said detail inner wire 3 is in sidewall that is parallel to its axis and the insulation of detail cavity 4 inwalls.
Also comprise and outside detail cavity 4, run through the tuning screw 5 that stretches in the detail cavity 4, tuning screw 5 is positioned at directly over the detail inner wire 3; And tuning screw 5 extends between an end and the detail inner wire 3 in the detail cavity 4 and has the gap, and the length that tuning screw 5 stretches into is regulated outside detail cavity 4 and fixed.
Also comprise the coupling screw A6 that outside metal cavitg 2, stretches into metal cavitg 2 inside, coupling screw A6 places inner wire 1 and detail inner wire 3 junctions, and is positioned at directly over the inner wire 1; Said coupling screw A6 extends between the inner end of metal cavitg 2 and the inner wire 1 and has the gap, and the length that coupling screw A6 stretches into is regulated outside metal cavitg 2 and fixed.
Also comprise the coupling screw B7 that outside metal cavitg 2, stretches into metal cavitg 2 inside, mate screw B7 between adjacent two short branch, and be positioned at directly over the inner wire 1; Said coupling screw B7 extends between the inner end of metal cavitg 2 and the inner wire 1 and has the gap, and the length that coupling screw B7 stretches into is regulated outside metal cavitg 2 and fixed.
Short branch is along being parallel to inner wire 1 axis direction, an equally spaced side that is arranged in metal cavitg 2.
Based on foregoing, we are in accompanying drawings: a kind of band line high pass filter based on the helix detail comprises inner wire 1, metal cavitg 2; 5 short branch, and all short branch are positioned at a side of metal cavitg 2; Inner wire 1 is positioned at metal cavitg 2, and the parallel axes of metal cavitg 2 is in the axis direction of inner wire 1, inner wire 1 and the insulation of metal cavitg 2 inwalls; Short branch is made up of detail inner wire 3 and detail cavity 4, and detail inner wire 3 bends to helical, and the axis normal of helix is in the axis direction of inner wire 1; One end of detail inner wire 3 is connected with inner wire 1, and a relative end is connected with detail cavity 4 inwalls, and 3 of detail inner wires are connected with detail cavity 4 with inner wire 1 at two ends; Detail inner wire 1 is the metal thin wire, can buy from market; Tuning for ease, also be provided with tuning screw 5, tuning screw 5 places the end of short branch away from opening, and tuning screw 5 length that stretches into detail cavity 4 can be regulated outside detail cavity 4 and fixing; Also be provided with coupling screw A and coupling screw B simultaneously, coupling screw A is positioned at inner wire 1 and detail inner wire 3 junctions, and is positioned at directly over the inner wire 1, and the length that coupling screw A stretches into metal cavitg 2 can be regulated from metal cavitg 2 outside and fixed; Coupling tuning screw B places between inner wire 1 and detail inner wire 3 junctions, and is positioned at directly over the inner wire, and the length that coupling screw B stretches into metal cavitg 2 can be regulated outside metal cavitg 2 and fixed.
Embodiment two
Like Fig. 4, shown in 5, be the both sides that adjacent short branch is positioned at metal cavitg 2 with embodiment one different place; Distance between the adjacent short branch equates; Detail inner wire 3 bends to helix; And the axis normal of helix is in the axis direction of inner wire 1; Detail inner wire 3 is the metal thin wire, can from market, directly buy, and detail inner wire 3 is being rectangle or circle perpendicular to the shape of cross section on its axis direction; Short branch is provided with tuning screw 5 away from an end of opening, and the length that tuning screw 5 stretches into detail cavity 4 can be regulated outside detail cavity 4 and is fixing.
Embodiment three
Like Fig. 6, shown in 7, different with embodiment one is that the plane inner bending of inner wire 1 at the short branch place becomes serpentine, and inner wire 1 is provided with chamfering in the place of bending, and chamfering can also can be circular arc for the right angle; Adjacent short branch is positioned at a side of metal cavitg; Detail inner wire 3 bends to helix, and the axis normal of helix is in the axis direction of inner wire 1; Detail inner wire 3 is the metal thin wire, can buy from market, and detail inner wire 3 is a rectangle or circular at the shape of cross section perpendicular to its axis direction.
Embodiment four
Like Fig. 8, shown in 9, are both sides that adjacent short branch is positioned at metal cavitg with embodiment three different places; Inner wire 1 becomes serpentine at the plane inner bending at short branch place, and inner wire 1 is provided with chamfering in the place of bending, and chamfering can also can be circular arc for the right angle; Detail inner wire 3 is the metal thin wire, can buy from market, and detail inner wire 3 is a rectangle or circular at the shape of cross section perpendicular to its axis direction.
Claims (9)
1. the band line high pass filter based on the spiral detail is characterized in that: two short branch that comprise transmission line and be connected with transmission line at least; Said transmission line is mainly by metal cavitg (2) and be arranged on the inner inner wire (1) of metal cavitg (2) and constitute; Said short branch is mainly by detail cavity (4) and be arranged on the inner detail inner wire (3) of detail cavity (4) and constitute, and said adjacent short branch is positioned at the one or both sides of metal cavitg (2); Detail inner wire (3) bends to spirality, and the axis normal of detail inner wire (3) is in the axis of inner wire (1), and the cross-sectional area of detail inner wire (3) is less than the cross-sectional area of inner wire (1).
2. a kind of band line high pass filter according to claim 1 based on the spiral detail, it is characterized in that: inner wire (1) is bent to serpentine; Inner wire (1) is consistent in shape of cross section and the size perpendicular to inner wire (1) axis direction, and metal cavitg (2) is consistent in shape of cross section and the size perpendicular to inner wire (1) axis direction; Detail inner wire (3) is consistent in shape of cross section and the size perpendicular to detail inner wire (3) axis direction, and detail cavity (4) is consistent perpendicular to the shape of cross section and the size of detail inner wire (3) axis direction.
3. a kind of band line high pass filter based on the spiral detail according to claim 1, it is characterized in that: the axis of all short branch and the axis of transmission line are positioned at same plane.
4. a kind of band line high pass filter according to claim 1 based on the spiral detail, it is characterized in that: the shape of cross section of inner wire (1) is a rectangle; The parallel axes of said metal cavitg (2) is in the axis direction of inner wire (1), and the shape of cross section of metal cavitg (2) is a rectangle; Said inner wire (1) and the insulation of metal cavitg (2) inwall; Said inner wire (1) on perpendicular to inner wire (1) axis direction with the spacing of metal cavitg (2) inwall less than 1/5 of the size of metal cavitg (2) on this direction.
5. a kind of band line high pass filter according to claim 1 based on the spiral detail, it is characterized in that: the axis normal of detail inner wire (3) is in the axis direction of inner wire (1), and the shape of cross section of detail inner wire (3) is a rectangle; The parallel axes of said detail cavity (4) is in the axis direction of detail inner wire (3).
6. according to any described a kind of band line high pass filter based on the spiral detail among the claim 1-5, it is characterized in that: said detail cavity (4) is provided with an openend, and openend also is connected with metal cavitg (2); And an end of said detail inner wire (3) is connected with inner wire (1), and detail inner wire (3) is connected with detail cavity (4) inwall away from an end of inner wire (1); Said detail inner wire (3) insulate with detail cavity (4) inwall being parallel on the direction of its axis.
7. a kind of band line high pass filter according to claim 6 based on the spiral detail; It is characterized in that: also comprise and outside detail cavity (4), run through the tuning screw (5) that stretches in the detail cavity (4), tuning screw (5) is positioned at directly over the detail inner wire (3); And tuning screw (5) extends between interior end of detail cavity (4) and the detail inner wire (3) and has the gap, and the length that tuning screw (5) stretches into is regulated outside detail cavity (4) and is fixing.
8. a kind of band line high pass filter according to claim 6 based on the spiral detail; It is characterized in that: also comprise and outside metal cavitg (2), stretch into the inner coupling screw A (6) of metal cavitg (2); Coupling screw A (6) places inner wire (1) and detail inner wire (3) junction, and is positioned at directly over the inner wire (1); Said coupling screw A (6) extends between inner end of metal cavitg (2) and the inner wire (1) and has the gap, and the length that coupling screw A (6) stretches into is regulated outside metal cavitg (2) and is fixing.
9. a kind of band line high pass filter according to claim 8 based on the spiral detail; It is characterized in that: also comprise and outside metal cavitg (2), stretch into the inner coupling screw B (7) of metal cavitg (2); Mate screw B (7) between adjacent two short branch, and be positioned at directly over the inner wire (1); Said coupling screw B (7) extends between inner end of metal cavitg (2) and the inner wire (1) and has the gap, and the length that coupling screw B (7) stretches into is regulated outside metal cavitg (2) and is fixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220096824 CN202444041U (en) | 2012-03-15 | 2012-03-15 | High-pass strip line filter based on spiral stub |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220096824 CN202444041U (en) | 2012-03-15 | 2012-03-15 | High-pass strip line filter based on spiral stub |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202444041U true CN202444041U (en) | 2012-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220096824 Expired - Fee Related CN202444041U (en) | 2012-03-15 | 2012-03-15 | High-pass strip line filter based on spiral stub |
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| Country | Link |
|---|---|
| CN (1) | CN202444041U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311609A (en) * | 2012-03-15 | 2013-09-18 | 成都赛纳赛德科技有限公司 | Strip line high-pass filter based on spiral stub |
| CN108899620A (en) * | 2018-06-05 | 2018-11-27 | 电子科技大学中山学院 | Compact waveguide filter |
-
2012
- 2012-03-15 CN CN 201220096824 patent/CN202444041U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311609A (en) * | 2012-03-15 | 2013-09-18 | 成都赛纳赛德科技有限公司 | Strip line high-pass filter based on spiral stub |
| CN108899620A (en) * | 2018-06-05 | 2018-11-27 | 电子科技大学中山学院 | Compact waveguide filter |
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| 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: 20120919 Termination date: 20150315 |
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| EXPY | Termination of patent right or utility model |