CN202444042U - Comb tooth ultra-wide-band filter - Google Patents
Comb tooth ultra-wide-band filter Download PDFInfo
- Publication number
- CN202444042U CN202444042U CN 201220096826 CN201220096826U CN202444042U CN 202444042 U CN202444042 U CN 202444042U CN 201220096826 CN201220096826 CN 201220096826 CN 201220096826 U CN201220096826 U CN 201220096826U CN 202444042 U CN202444042 U CN 202444042U
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- broach
- cavity
- ultra
- band filter
- cover plate
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Abstract
The utility model discloses a comb tooth ultra-wide-band filter which comprises a comb tooth structure and a ridge structure being connected with adjacent comb teeth, at the same time, the end surface central point of an end (contacted with a comb tooth) of an internal conductor adopting a joint is higher than the upper top surface of the comb tooth, and the requirement of an ultra wide band is met. The comb tooth ultra-wide-band filter provided by the utility model has the advantages of being simple in processing, low in processing cost, convenient for debugging, low in insertion loss, high in finished product rate and the like. The ultra-wide-band filter provided by the utility model is expected to be widely applied to an ultra-wide-band wireless communication system, especially the military and civilian fields of radars, missile guidance, electronic countermeasure, communication and the like.
Description
Technical field
The utility model patent relates to a kind of filter, specifically, relates to a kind of ultra-wide band filter that utilizes the cavity comb-type structure.
Background technology
So-called ultra-wide band filter makes and refers to that relative bandwidth surpasses the band pass filter more than 30%.Along with the fast development of The Technology of Ultra, the super broad band radio communication electronic equipment is had higher requirement.Filter is being played the part of important role in super broad band radio communication system; It plays the important function of selecting signal; Be requisite critical elements in the super broad band radio communication system, its service behaviour quality directly has influence on the integral working of super broad band radio communication system.
Mostly traditional ultra-wide band filter be to realize that with structures such as microstrip line, the line of rabbet joint and defective ground this filter has the little characteristics of volume, but have also that Insertion Loss is big, a shortcoming such as band suppresses poor outward, be difficult for debugging and rate of finished products is low.But the utility model patent adopts the ridge waveguide structure implementation structure simple, and differential loss is little, and parasitic passband is far away, the advantage of stable performance.
The utility model content
The purpose of the utility model be to provide a kind of low Insertion Loss, processing simple, be easy to debug, ultra-wide band filter that rate of finished products is high.The relative bandwidth of the ultra-wide band filter of this paper definition can be accomplished more than 100%.
To achieve these goals; The technical scheme that the utility model adopts is: a kind of broach ultra-wide band filter; Comprise cavity and be arranged on two coaxial line joints on the cavity; And the cover plate that is arranged on cavity top, and the broach that is arranged on inside cavity and is connected with cavity bottom, said coaxial line joint mainly are made up of coaxial outer conductor and the coaxial inner conductor that runs through coaxial outer conductor; Broach is the plane parallel with cover plate away from the one side of cavity bottom; Be provided with ridge structure between the adjacent fingers; Coaxial inner conductor stretches in the cavity and with broach and contacts, and said coaxial inner conductor is connected an end with broach end face central point is higher than the one side of broach away from cavity bottom.
The said coaxial inner conductor that stretches in the cavity directly is placed on broach away from contacting on the one side of cavity bottom and with it.
Broach has sulculus in the side near cavity wall, and sulculus is positioned at the top of this side, and said coaxial inner conductor is arranged in the sulculus, and said coaxial inner conductor is connected an end with broach end face central point is higher than the one side of broach away from cavity bottom.
On the cover plate above the cavity and be positioned at the coaxial inner conductor that stretches into cavity directly over be provided with Baltimore groove, the notch opening direction of said Baltimore groove is for pointing to cavity bottom, the flute length of its Baltimore groove stretches into the length in the cavity greater than coaxial inner conductor.
Said cavity, the cross section of broach and ridge structure are rectangle.
The cross section of said Baltimore groove be rectangle and with broach away from least two vertical crest line roundings of the one side of cavity bottom.
The cross section of said Baltimore groove is a circular part.
Said ridge structure is connected with cavity bottom, and it highly is lower than the broach height.
Said cover plate top has through cover plate and is positioned at the tuning screw directly over the broach; Also be provided with through cover plate on the said cover plate and be positioned at the tuning screw directly over the ridge structure, also be provided with through cover plate on the said cover plate and extend into the tuning screw in the Baltimore groove.
Have the gap between said broach and the cover plate, its gap is less than 1/8 of housing depth.
The utility model stretches into coaxial inner conductor in the cavity and with broach and contacts, and said coaxial inner conductor is connected an end with broach end face central point is higher than the one side of broach away from cavity bottom.The input and output joint can better be mated under ultra width; Filter in the past adopts the connected mode with coaxial line joint and broach middle part, and this set can only satisfy general filter function, can not reach the effect of ultra broadband filtering.Draw through experiment, the utility model is higher than the one side of broach away from cavity bottom with coaxial inner conductor is connected an end with broach end face central point, and such setting can realize that the input and output joint can better mate under ultra width; Can realize the effect of ultra broadband filtering with this.
Further, the setting of coaxial line joint can be divided into two kinds, and a kind of is directly the coaxial line joint to be placed on broach away from contacting on the one side of cavity bottom and with it.Being provided with like this is simple in structure, can practice thrift the processing cost, enhances productivity.Another kind of; The utility model also will have sulculus at broach on the two ends near the cavity two side; Sulculus is positioned at the top of this side, and coaxial inner conductor is arranged in the sulculus, and said coaxial inner conductor is connected an end with broach end face central point is higher than the one side of broach away from cavity bottom.
Because along with metal ridge is more little away from the one side and the gap between the cover plate of empty waveguide bottom,
Then the bandwidth of the ridge waveguide of metal ridge and empty waveguide composition is with increasing; The table one of below is 15mm for the empty duct width of rectangle; Highly be 8mm, two transmission frequencies of claiming the pattern that electromagnetic field distributes of the money when rectangular metal ridge width is 4.92mm under the pattern analysis of CST.Wherein represent metal ridge away from the one side of empty waveguide bottom and the gap between the cover plate with gap, f1 representes the transmission frequency of first pattern, and f2 is expressed as the transmission frequency of second pattern, and the unit of frequency is GHz, and the unit of length is mm.
Table one
Can find out that along with the change of gap is big f1 becomes big trend, and to become big trend than f2 much fast, promptly the ratio of f2 and f1 is more and more littler, so its relative bandwidth is also just more and more littler.
At this; For the requirement that realizes the filter ultra broadband and make that its parasitic passband is far away; Make its return loss less than 10dB simultaneously, draw according to experimental check, the utility model spy with broach away from the one side of cavity bottom and the gap between the cover plate less than 1/8 of housing depth.
Tuning in order to carry out the input and output of coaxial inner conductor, the utility model also is provided with Baltimore groove, on Baltimore groove too be provided with tuning screw.
Increasing coaxial air column can make the input and output side head can better matching.
The operation principle of ultra-wide band filter:
Each comb structure constitutes a resonant cavity; Ridge structure between two adjacent comb structures can strengthen the coupling between chamber and the chamber greatly; Make it bandwidth and become very wide; And coaxial inner conductor make it central point at the end face on the comb structure at cavity two ends be higher than comb structure on push up the plane, so coaxial coupling to waveguide can be fine, well satisfies the requirement of ultra broadband.
When signal got into filter and runs into first resonant cavity, this signal was distributed for the first time.Wherein a part continues transmission along filter, and another part is reflected by first resonant cavity.Signal along filter continuation transmission will run into second resonant cavity again, experience similar process, until export from filter through all resonant cavitys.
In some frequency, the signal that from all resonant cavitys, reflects is all offset, and the signal of these frequencies will be exported from filter output, and loss is very little.The signal of frequency in addition, the signal that from all resonant cavitys, reflects stack, the signal of these frequencies will reflect from filter input end, and will be very little from the signal of output output.Utilize this specific character, the signal low-loss that filter can be made way in the band connection frequency is passed through, and the signal reflex of making way in the stopband is fed back into end.
The advantage of the utility model is, debugging is convenient, Insertion Loss is low, band suppresses outward, rate of finished products height and processing cost are low.The ultra-wide band filter that the utility model provides is expected to be widely used in the super broad band radio communication system, particularly military affairs and civil areas such as radar, missile guidance, electronic countermeasures, communication.
Description of drawings
Fig. 1 is the side sectional view of the utility model embodiment 1.
Fig. 2 is the cutaway view of the A-A direction of Fig. 1 among the utility model embodiment 1.
Fig. 3 is the side sectional view among the utility model embodiment 2.
Label among the figure is expressed as respectively: 1, coaxial inner conductor; 2, coaxial outer conductor;
3, cavity; 4, broach; 5, ridge structure; 6, cover plate; 7, groove; 8, tuning screw.
Embodiment
Below in conjunction with embodiment the utility model is done to specify further, but the utility model execution mode is not limited thereto.
As illustrated in fig. 1 and 2; A kind of broach ultra-wide band filter; Comprise cavity 3 and be arranged on two coaxial line joints on the cavity 3; And the cover plate 6 that is arranged on cavity 3 tops, and being arranged on the broach 4 that cavity 3 is inner and be connected with cavity 3 bottoms, said coaxial line joint mainly is made up of coaxial outer conductor 2 and the coaxial inner conductor 1 that is positioned at coaxial outer conductor 2; Broach 4 is the plane parallel with cover plate 6 away from the one side of cavity 3 bottoms; Be provided with ridge structure 5 between the adjacent fingers 4; Coaxial inner conductor 1 stretches in the cavity 3 and with broach 4 and contacts, and said coaxial inner conductor 1 is connected an end with broach 4 end face central point is higher than the one side of broach 4 away from cavity 3 bottoms.
The said coaxial inner conductor 1 that stretches in the cavity 3 directly is placed on broach 4 away from contacting on the one side of cavity 3 bottoms and with it.
On the cover plate above the cavity 36 and be positioned at the coaxial inner conductor 1 that stretches into cavity 3 directly over be provided with Baltimore groove 7; The notch opening direction of said Baltimore groove 7 is for pointing to cavity 3 bottoms, and the flute length of its Baltimore groove 7 stretches into the length in the cavity 3 greater than coaxial inner conductor 1.
Said cavity 3, broach 4 is a rectangle with the cross section of ridge structure 5.
The cross section of said Baltimore groove 7 is that rectangle or cross section are a circular part.
Said ridge structure 5 is connected with cavity 3 bottoms, and it highly is lower than broach 4 height.
Said cover plate 6 tops have through cover plate 8 and are positioned at the tuning screw 8 directly over the broach 4; Also be provided with through cover plate 8 on the said cover plate 6 and be positioned at the tuning screw 8 directly over the ridge structure 5, also be provided with through cover plate 8 on the said cover plate 6 and extend into the tuning screw 8 in the Baltimore groove 7.
Have the gap between said broach 4 and the cover plate 6, its gap is less than 1/8 of cavity 3 height.
Other implementation of the utility model is diversified, on the cover plate 5 Baltimore groove 6 given here be that the cross section is a cuboid, it also can be the groove of a circular part.
As shown in Figure 3; The difference of itself and embodiment 1 is for to have sulculus at said broach 4 near cavity 3 lateral faces; Sulculus is positioned at the top of this side; Said coaxial inner conductor 1 is arranged in the sulculus, and said coaxial inner conductor 1 is connected an end with broach 4 end face central point is higher than the one side of broach 4 away from cavity 3 bottoms.
Just can realize the utility model preferably as stated.
Claims (10)
1. broach ultra-wide band filter; It is characterized in that: comprise cavity (3) and be arranged on two coaxial line joints on the cavity (3); And the cover plate (6) that is arranged on cavity (3) top; And being arranged on cavity (3) broach (4) inner and that is connected with cavity (3) bottom, said coaxial line joint is mainly by coaxial outer conductor (2) and coaxial inner conductor (1) formation that is positioned at coaxial outer conductor (2); Broach (4) away from the one side of cavity (3) bottom is and the parallel plane of cover plate (6); Be provided with ridge structure (5) between the adjacent fingers (4); Coaxial inner conductor (1) stretches in the cavity (3) and with broach (4) and contacts, and said coaxial inner conductor (1) is connected an end with broach (4) end face central point is higher than the one side of broach (4) away from cavity (3) bottom.
2. a kind of broach ultra-wide band filter according to claim 1 is characterized in that: the said coaxial inner conductor (1) that stretches in the cavity (3) directly is placed on broach (4) away from contacting on the one side of cavity (3) bottom and with it.
3. a kind of broach ultra-wide band filter according to claim 1; It is characterized in that: broach (4) is having sulculus near cavity (3) lateral faces; Sulculus is positioned at the top of this side; Said coaxial inner conductor (1) is arranged in the sulculus, and said coaxial inner conductor (1) is connected an end with broach (4) end face central point is higher than the one side of broach (4) away from cavity (3) bottom.
4. a kind of broach ultra-wide band filter according to claim 1; It is characterized in that: the cover plate (6) of cavity (3) top go up and be positioned at the coaxial inner conductor (1) that stretches into cavity (3) directly over be provided with Baltimore groove (7); The notch opening direction of said Baltimore groove (7) is for pointing to cavity (3) bottom, and the flute length of its Baltimore groove (7) stretches into the length in the cavity (3) greater than coaxial inner conductor (1).
5. a kind of broach ultra-wide band filter according to claim 1 is characterized in that: said cavity (3), broach (4) is a rectangle with the cross section of ridge structure (5).
6. a kind of broach ultra-wide band filter according to claim 4 is characterized in that: the cross section of said Baltimore groove (7) be rectangle and with the one side vertical at least two piece crest line roundings of broach (4) away from cavity (3) bottom.
7. a kind of broach ultra-wide band filter according to claim 4 is characterized in that, the cross section of said Baltimore groove (7) is a circular part.
8. according to the said a kind of broach ultra-wide band filter of claim 1, it is characterized in that: said ridge structure (5) is connected with cavity (3) bottom, and it highly is lower than broach (4) highly.
9. a kind of broach ultra-wide band filter according to claim 1; It is characterized in that: said cover plate (6) top has through cover plate (8) and is positioned at the tuning screw (8) directly over the broach (4); Also be provided with through cover plate (8) on the said cover plate (6) and be positioned at the tuning screw (8) directly over the ridge structure (5), also be provided with through cover plate (8) on the said cover plate (6) and extend into the tuning screw (8) in the Baltimore groove (7).
10. according to any described a kind of broach ultra-wide band filter among the claim 1-9, it is characterized in that: have the gap between said broach (4) and the cover plate (6), its gap is less than 1/8 of cavity (3) height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220096826 CN202444042U (en) | 2012-03-15 | 2012-03-15 | Comb tooth ultra-wide-band filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220096826 CN202444042U (en) | 2012-03-15 | 2012-03-15 | Comb tooth ultra-wide-band filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202444042U true CN202444042U (en) | 2012-09-19 |
Family
ID=46825474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220096826 Expired - Fee Related CN202444042U (en) | 2012-03-15 | 2012-03-15 | Comb tooth ultra-wide-band filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202444042U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311615A (en) * | 2012-03-15 | 2013-09-18 | 成都赛纳赛德科技有限公司 | Comb ultra wide band filter |
| CN107732390A (en) * | 2017-10-20 | 2018-02-23 | 中电科技集团重庆声光电有限公司 | A kind of electromagnetism hybrid coupled cavity body filter |
-
2012
- 2012-03-15 CN CN 201220096826 patent/CN202444042U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311615A (en) * | 2012-03-15 | 2013-09-18 | 成都赛纳赛德科技有限公司 | Comb ultra wide band filter |
| CN103311615B (en) * | 2012-03-15 | 2015-09-30 | 成都赛纳赛德科技有限公司 | A kind of comb ultra wide band filter |
| CN107732390A (en) * | 2017-10-20 | 2018-02-23 | 中电科技集团重庆声光电有限公司 | A kind of electromagnetism hybrid coupled cavity body filter |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120919 Termination date: 20160315 |