CN102804483B - Frequency Cavity Filter Having Improved Assembly Error And A Bolt Used Therefor - Google Patents
Frequency Cavity Filter Having Improved Assembly Error And A Bolt Used Therefor Download PDFInfo
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- CN102804483B CN102804483B CN201080027031.6A CN201080027031A CN102804483B CN 102804483 B CN102804483 B CN 102804483B CN 201080027031 A CN201080027031 A CN 201080027031A CN 102804483 B CN102804483 B CN 102804483B
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- Prior art keywords
- bolt
- main part
- resonator
- filter
- width
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- Expired - Fee Related
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
- H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The present invention relates to a frequency cavity filter for improving data characteristics by reducing an assembly error, and a bolt used therefor. The frequency cavity filter comprises a housing where a plurality of cavities is defined by partition walls, a resonator that is accommodated in a specific cavity and a first bolt for fastening the resonator to the housing. Here, the resonator includes a specific hole into which the first bolt is inserted, and the hole is at least 3t (3mm) in length.
Description
Technical field
The present invention relates to a kind of frequency cavity filter and for bolt wherein, particularly relate to a kind of by reduce build-up tolerance improve data characteristic frequency cavity filter and for bolt wherein.。
Background technology
Frequency cavity filter, as the device making the signal of only special frequency band in the frequency signal of input pass through, has structure as shown in Figure 1 usually.
Fig. 1 is the concise and to the point exploded perspective view of the structure showing existing frequency cavity filter, and Fig. 2 makes resonator be combined in the sectional view of the structure on shell in the filter being presented at Fig. 1.
With reference to Fig. 1, frequency cavity filter comprises shell 100, lid 102 and multiple resonator 104.
In the central authorities of resonator 104, formed porose as Suo Shi Fig. 2 (A), bolt 200 is inserted by described hole.Specifically, bolt 200 is by the hole of resonator 104, and be attached to the groove 204 of the bottom surfaces of shell 100, its result, resonator 104 is fixed on shell 100 by bolt 200.
The resonator 104 of Fig. 2 (A) and Fig. 2 (B) and the structure of bolt 200 are described, and the long L1 in the hole of resonator 104 is 2.4t, and width is about 3t.In addition, bolt 200 is made up of head 212 and main part 210, as shown in Fig. 2 (B), is formed with screw thread 214 in main part 210.Wherein, 1t represents 1mm.
Be described the resonator 104 of Fig. 2 (C) and the structure of bolt 220 of applying taper angle (Count sinking), the length L2 in the hole of resonator 104 is 1.85t, and width is about 3t.Wherein, the head of bolt 220 corresponds to the structure of described angle (sinking) through modification, main part has the length being equivalent to 1.85t.
That is, in existing filter, design the length in the hole being formed at resonator 104 at below 2.4t, bolt 200 and 220 corresponds to the structure in described hole.But because the length in the hole of resonator 104 is quite little, therefore said structure also becomes the reason that also can produce suitable build-up tolerance after resonator 104 is combined on shell 100.
Especially, owing to there is multiple resonator 104 in described frequency cavity filter, therefore above-mentioned build-up tolerance becomes the reason needing more tuning period.
In addition, due to described build-up tolerance, the problem that the data characteristic also creating described filter reduces.
Summary of the invention
Technical problem
The frequency cavity filter the object of the invention is to, provide a kind of and reduce build-up tolerance, data characteristic being improved and for bolt wherein.
Technical scheme
For realizing object as above, provide a kind of frequency cavity filter to comprise according to one embodiment of the invention: shell, be there are the multiple cavitys limited by multiple dividing plate; Be housed in the resonator in specific cavity; And first bolt, make described resonator fixing in the housing.Wherein, the length in specific hole and described hole that described resonator is formed for inserting described first bolt is more than 3t (3mm).
Described first bolt comprises: head; First main part, is extended by described head along the direction perpendicular to described head and is inserted in described hole; And second main part, extended by described first main part and engaged with described shell.Wherein, described first main part has the length corresponding to described hole.
The width of described second main part is less than the width of described first main part, and described second main part be formed with screw thread at least partially.
Described hole has the width of 4.5t to 4.6t, and the first main part of described first bolt has the width of 4.45t to 4.55t, and described hole has the length of 3t to 11t.
There is provided a kind of frequency cavity filter to comprise according to another embodiment of the present invention: shell, be there are the multiple cavitys limited by multiple dividing plate; Be housed in the resonator in specific cavity; First bolt, makes described resonator fixing in the housing; Cover the housing cove of described shell; And second bolt, described housing cove is engaged with described shell.Wherein, the length in specific hole described hole that described resonator is formed for inserting described first bolt is more than 3t (3mm), and described second bolt has the structure identical with described first bolt.
There is provided a kind of frequency cavity filter to comprise according to still another embodiment of the invention: shell, be there are the multiple cavitys limited by multiple dividing plate; Resonator, to be housed in specific cavity and to be formed porose; And first bolt, by the hole of described resonator and the groove engagement of described shell, make described resonator be fixed on described shell.Wherein, described first bolt comprises: head; First main part, is extended by described head along the direction perpendicular to described head and is inserted in described hole; And second main part, extended by described first main part and engaged with described shell.And wherein, described hole comprises: the first sub-aperture; And second sub-aperture, there is the width being less than described first sub-aperture.Described first main part has the length corresponding to described hole, and the length in described hole is more than 3t (3mm), and the first main part of described first bolt inserts described second sub-aperture.
A kind of bolt for frequency cavity filter is provided to comprise according to still another embodiment of the invention: head; First main part, is extended along the direction perpendicular to described head by described head; And second main part, extended by described first main part.Wherein, described first main part has the length of more than 3t (3mm).
Described bolt is inserted into the groove engagement of the Kong Bingyu shell in resonator, and the width of described second main part is less than the width of described first main part, and described second main part be formed with screw thread at least partially.
Described first main part has the length of 3t to 11t and the width of 4.45t to 4.55t.
Technique effect
In frequency cavity filter according to the present invention, due to resonator hole and insert bolt wherein and ensure that enough length, therefore the build-up tolerance of described filter is made to minimize, consequently there is the tuning period after can not only making assembling reduce, and the advantage of data characteristic of described filter can be improved.
Accompanying drawing explanation
Fig. 1 is the concise and to the point exploded perspective view of the structure showing existing frequency cavity filter;
Fig. 2 makes resonator be combined in the sectional view of the structure on shell in the filter being presented at Fig. 1;
Fig. 3 is the concise and to the point exploded perspective view of display according to the structure of the frequency cavity filter of one embodiment of the invention;
Fig. 4 is display according to the bolt of one embodiment of the invention and the sectional view of integrated structure of resonator using it;
Fig. 5 is the exploded perspective view of display frequency cavity filter according to another embodiment of the present invention;
Fig. 6 is that display is according to the build-up tolerance characteristic of the frequency cavity filter of one embodiment of the invention and the schematic diagram of data characteristic.
Embodiment
Below, with reference to accompanying drawing, embodiments of the invention are described in detail.
Fig. 3 is the concise and to the point exploded perspective view of display according to the structure of the frequency cavity filter of one embodiment of the invention.
With reference to Fig. 3, comprise shell (Housing) 300, lid 302, multiple cavity (Cavities) 308, multiple resonator (Resonators) 310, input adapter 304, out splice going splice 306 and multiple tuned cell (Tuning Element) 312 according to the frequency cavity filter of the embodiment of the present invention.
Shell 300 plays the multiple internal constituent elements of the filter described in protection, such as resonator 310 etc., and shields electromagnetic effect.
According to one embodiment of the invention, shell 300 can be made up of aluminum material, especially in order to make minimization of loss, silver outstanding for conductivity can be plated in this aluminum material.Moreover, comprising silver-plated, shell 300 can also be applied in by being used for improving other plating method corrosion proof etc.
As shown in Figure 3, lid 302, as the element covering shell 300, is combined with shell 300 on the top of shell 300.Specifically, in lid 302, be formed with multiple combined hole, be formed at shell 300 corresponding with more than first described combined hole multiple in conjunction with groove, and make multiple combined hole described in specific multiple bolt-through, lid 302 is combined on shell 300.
In addition, in lid 302, be formed with the multiple holes for making multiple tuned cell 312 insert, thus it is inner to make multiple tuned cell 312 be inserted into shell 300 by described multiple holes.
According to one embodiment of the invention, owing to being formed with screw thread in described hole, therefore along with tuned cell 312 rotates, then can change the distance between tuned cell 312 and corresponding resonator 310.As a result, owing to changing the electric capacity (Capacitance) between tuned cell 312 and corresponding resonator 310, therefore can tuned frequency by the distance changed between tuned cell 312 and corresponding resonator 310.
Specifically, when user is for carrying out tuning to described filter, this user, by changing the penetration depth of tuned cell 312, regulates the distance between tuned cell 312 and resonator 310, can implement frequency tuning.Moreover, complete tuning after, by multiple fixed form, the distance between tuned cell 312 and resonator 310 is fixed, thus tuned cell 312 can be made to fix.
Above-mentioned multiple tuned cell 312 corresponds to multiple resonator 310 and arranges one to one, preferably, corresponding to the central array of multiple resonator 310.Moreover, tuned cell 312 can not correspond to the central array of resonator 310 yet, and correspond to described central authorities positions in a distance on arrange.That is, if the relation that tuned cell 312 and resonator 310 arrange one to one can be guaranteed, multiple modification can be had.
Referring again to the structure of Fig. 3 observation filter device, the inside of described filter is formed with multiple dividing plate, and multiple cavity 308 is limited by described multiple dividing plates.Herein, in multiple cavity 308, resonator 310 is contained respectively.
Multiple cavity 308 is relevant with the progression of described filter to the number of multiple resonator 310, and Fig. 3 illustrates that middle progression is 8, i.e. 8 resonators 310.Wherein, the progression of described filter is relevant to insertion loss and edge (skirt) characteristic, such as, along with the progression of described filter raises, can improve local edge or reduce insertion loss.Therefore, consider the insertion loss of requirement and the progression of local edge setting filter, multiple resonator 310 can be designed thus.
According to one embodiment of the invention, multiple resonator 310 is fixed on the bottom surfaces of shell 300 by multiple bolts 400 of structure as shown in Figure 4.
As shown in Figure 3, above-mentioned resonator 310 can be disk resonator, also can be cylindrical resonator.That is, if can guarantee that resonator 310 is fixed on the situation of shell 300 by bolt 400, the shape of resonator 310 can have multiple modification.
In a part for described multiple dividing plates, the direct of travel that can also correspond to RF signal forms coupling window.The RF signal resonated by cavity 308 and resonator 310 marches to next cavity 308 by coupling window.
Referring to accompanying drawing, describe the method that will be fixed on according to the resonator 310 of one embodiment of the invention on shell 300 in detail.
Fig. 4 is display according to the bolt of one embodiment of the invention and the sectional view of integrated structure of resonator using it.Below for ease of illustrating, assuming that resonator 310 is cylindrical resonator.
As shown in Fig. 4 (A), in the inside of resonator 310, preferably formed at central portion porose, and be formed with groove 406 in the bottom surfaces of shell 300.Wherein, described hole can be made up of the first sub-aperture 402 corresponding with the first subresonator 310a of resonator 310 and the second sub-aperture 404 corresponding with the second subresonator 310b of resonator 310.
According to one embodiment of the invention, the width of the first sub-aperture 402 is greater than the width of the second sub-aperture 404.This is in order to when the first main part 412 of bolt 400 is inserted into the second sub-aperture 404, and head 410 is supported by the upper end of the second subresonator 310b.
Below, the method be fixed on by resonator 310 by bolt 400 on shell 300 and structure are described in detail.
As shown in Fig. 4 (A), bolt 400 is inserted into the groove 406 of shell 300 by the second sub-aperture 404.Specifically, the first main part 412 of bolt 400 is positioned at the second sub-aperture 404, and the second main part 414 of bolt 400 is positioned at the groove 406 of shell 300.That is, bolt 400 is combined on the groove 406 of shell 300 by the second sub-aperture 404 by user, thus resonator 310 is fixed on shell 300.
According to one embodiment of the invention, partly or entirely can be formed with screw thread at the second main part 414, consequently by rotation mode, bolt 400 can be combined on the groove 406 of shell 300.Moreover, although not shown in Fig. 4 (A), on the inner peripheral surface of shell 300 corresponding to groove 406, the screw thread with the screw-threaded engagement of bolt 400 also can be formed with.
Below the specification of resonator 310 and bolt 400 is described.
For the specification of the second sub-aperture 404 that bolt 400 inserts, the length L1 of the second sub-aperture 404 has the length of more than 3t, preferably, have the length of 3t to 11t, and width W 1 can have the width of 4.5t to 4.6t.Wherein, 1t represents 1mm.
Specification for bolt 400 is described, and because the first main part 412 of bolt 400 corresponds to the second sub-aperture 404, therefore the length L2 of the first main part 412 can have the length of 3t to 11t, and width W 2 can have 4.45t to 4.55t width.But when considering the convenience and data characteristic etc. of assembling, preferably, the first main part 412 has the length of 3t to 4t.
As shown in Figure 4, according to one embodiment of the invention, the second main part 414 of bolt 400 can have the width less than the first main part 412.Such as, the width W 3 of the second main part 414 can have about 2t to 3t width, and length L3 can consider that the thickness of shell 300 sets rightly.Moreover, if can guarantee, the width of the second main part 414 of bolt 400 is less than the situation of the width of the first main part 412, and the width of the second main part 414 and length are without particular restriction.
Moreover, although the width of the second main part 414 of bolt 400 can be identical with the width of the first main part 412, when the minimizing considering build-up tolerance, preferably the width of the second main part 414 is less than the width of the first main part 412.
Screw thread for bolt 400 is described, and as shown in Fig. 4 (B), this screw thread can be formed in the outside of the second main part 414, and for example shown in Fig. 4 (C), also can be formed in the interior survey of the second main part 414.However, when considering the convenience of manufacturing process, preferably this screw thread is formed in the outside of the second main part 414.
Below, the bolt-joint structure of the bolt-joint structure of existing filter and filter of the present invention is compared.
In existing filter, because the degree of depth in the hole in resonator is at below 2.4t, therefore, even if bolt is combined on shell by described hole, also can produce quite serious build-up tolerance, the situation needing to retune often occurs.Especially, owing to there is build-up tolerance in the cohesive process of most of multiple resonator, therefore there is the problem of the longer tuning period of needs.In addition, due to this build-up tolerance, the data characteristic of described filter may be made to reduce.
In addition, due in existing bolt, the main part be inserted in the hole of resonator has identical width with the main part be inserted in the groove of shell, therefore when producing build-up tolerance, cannot reduce this build-up tolerance.
On the contrary, according to filter of the present invention, the length of the second sub-aperture 404 in resonator 310 is at least 3t, and the first main part 412 corresponding to the bolt 400 of the second sub-aperture 404 has the length of more than 3t, therefore build-up tolerance is made to obtain reduction to a great extent, namely, after bolt 400 is combined on shell 300, there is loosening of bolt 400 hardly, the characteristic of described filter changes hardly.Wherein, the value that 3t length obtains as result is by experiment the value that build-up tolerance can be made to improve, data characteristic is improved.Referring to accompanying drawing, the experimental result of existing filter characteristic and filter characteristic of the present invention is described.
In addition, width due to the second main part 414 of bolt 400 is less than the width of the first main part 412, and the width of the groove 406 of shell 300 is less than the width of the second sub-aperture 404, therefore, if when bolt 400 is combined on shell 300, the loosening of bolt 400 then can be made to minimize, and build-up tolerance is reduced, thus the data characteristic of described filter can be made to be improved.
In a word, in frequency cavity filter of the present invention, compared with existing filter, the length of the second sub-aperture 404 of inserting bolt 400 is made to arrange longer and bolt 400 is alignd with described hole by design, thus build-up tolerance is reduced, data characteristic is improved.
In addition, make the second main part 414 of bolt 400 have the width less than the first main part 412, thus make the combination of bolt 400 keep stable.
Fig. 5 is the exploded perspective view of display frequency cavity filter according to another embodiment of the present invention.
With reference to Fig. 5, comprise shell 300, lid 302, multiple cavity 308, multiple resonator 310, input adapter 304, out splice going splice 306, multiple tuned cell 312 and multiple bolt 500 and 502 according to the frequency cavity filter of the present embodiment.
Because other element except multiple bolt 500 and 502 is identical with the structure of Fig. 3, therefore the description thereof will be omitted and use identical accompanying drawing number.
Multiple bolt 500 and 502 has the structure as shown in Fig. 4 B or Fig. 4 C, and lid 302 is combined in the upper end of shell 300.Moreover, in lid 302, be formed with multiple hole, and can be inserted in the plurality of hole with multiple bolts that multiple bolt 500 and 502 has different structure.That is, there are the multiple bolts 500 and 502 of structure as Fig. 4 (B) or Fig. 4 (C) shows and multiple bolts of other structure, can be used for lid 302 to be fixed on shell 300.Moreover, in order to be fixed on shell 300 by lid 302, multiple bolts with the structure shown as Fig. 4 (B) or Fig. 4 (C) also only can be used.
Although employ 2 bolts 500 and 502 with structure as shown in Figure 4 in above-mentioned Fig. 5, also can only use 1, or use more than 3.That is, the number with the bolt of structure is as shown in Figure 4 selected according to the object of user.
Below, by using 2 bolts 500 and 502 with structure as shown in Figure 4, lid 302 is fixed on shell 300, and by under the state that uses multiple bolt 400 to fix multiple resonator 310, the build-up tolerance characteristic of described filter and data characteristic is described in detail.
Fig. 6 is that display is according to the build-up tolerance characteristic of the frequency cavity filter of one embodiment of the invention and the schematic diagram of data characteristic.However, existing filter uses the filter of structure as Suo Shi Fig. 2 (C).
The performance diagram that Fig. 6 (A) is existing filter, the performance diagram that Fig. 6 (B) is filter of the present invention.Wherein, in Reference numeral, 600 is the S21 characteristic curve of existing filter, and in Reference numeral, 602 is the S11 characteristic curve of existing filter.In addition, in Reference numeral, 612 is the S21 characteristic curve of filter of the present invention, and in Reference numeral, 610 is the S11 characteristic curve of filter of the present invention.
Observe 1. can confirm in the S21 characteristic curve 600 of existing filter, (Shift is serious and irregular in the movement of bandwidth.On the contrary, observe 1. can confirm in the S21 characteristic curve 612 of filter of the present invention, there is the movement of bandwidth hardly and very regular.That is, can confirm that filter characteristic of the present invention is more stable compared with existing filter characteristic.
Observe 2. can confirm in the S11 characteristic curve 602 of existing filter, return loss (ReturnLoss) is about about 10 and irregular.On the contrary, observe 2. can confirm in the S11 characteristic curve 610 of filter of the present invention, return loss is very regular about more than 15.That is, can confirm that the return loss characteristic of filter of the present invention is more outstanding compared with existing filter.
Observe 3. can confirm in the S21 characteristic curve 600 of existing filter, scold that to refuse (Rejection) characteristic unstable and irregular.On the contrary, observe 3. can confirm in the S21 characteristic curve 612 of filter of the present invention, scold and refuse stability of characteristics and very regular.That is, what can confirm filter of the present invention scolds that to refuse characteristic more outstanding compared with existing filter characteristic.
In a word, according to the present invention, by changing the structure of frequency cavity filter and the structure of bolt 400, improving build-up tolerance compared with existing filter, being therefore improved compared with the data characteristic of existing filter according to the data characteristic of filter of the present invention.
Industrial applicability
In this manual; only with exemplary object; disclose the above embodiments; and those of ordinary skill in the art should learn: not departing from the scope of the inventive concept; can modify, replace, additional, and this amendment, replacement, additionally should to fall in the claimed scope of claims of the present invention.
Claims (2)
1. a frequency cavity filter, comprising:
Shell, has the multiple cavitys limited by multiple dividing plate;
Be housed in the resonator in described cavity, described resonator formed porose; And
First bolt, makes described resonator fixing in the housing,
Wherein said first bolt comprises:
Head;
First main part, is extended by described head along the direction perpendicular to described head and is inserted in described hole; And
Second main part, is extended by described first main part and is engaged with described shell,
And the width of wherein said second main part is less than the width of described first main part, described hole comprises the first sub-aperture and the second sub-aperture, described second sub-aperture length is more than 3mm and has the width being less than described first sub-aperture, described first main part is inserted in described second sub-aperture, be formed with the groove for inserting described second main part on the housing, the width of described groove is less than the width of described second sub-aperture, and on described second main part, be formed with screw thread, described first main part does not have screw thread.
2. frequency cavity filter according to claim 1, is characterized in that,
Described second sub-aperture has the width of 4.5mm to 4.6mm, and the first main part of described first bolt has the width of 4.45mm to 4.55mm, and described second sub-aperture has the length of 3mm to 11mm.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2009-0054183 | 2009-06-18 | ||
| KR1020090054183A KR101080890B1 (en) | 2009-06-18 | 2009-06-18 | Frequency cabity filter improving assembly tolerance and bolt employed in the same |
| PCT/KR2010/003931 WO2010147417A2 (en) | 2009-06-18 | 2010-06-17 | Frequency cavity filter having improved assembly error and a bolt used therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102804483A CN102804483A (en) | 2012-11-28 |
| CN102804483B true CN102804483B (en) | 2015-07-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201080027031.6A Expired - Fee Related CN102804483B (en) | 2009-06-18 | 2010-06-17 | Frequency Cavity Filter Having Improved Assembly Error And A Bolt Used Therefor |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR101080890B1 (en) |
| CN (1) | CN102804483B (en) |
| WO (1) | WO2010147417A2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101226425B1 (en) * | 2011-05-25 | 2013-01-24 | 박타흥 | radio frequency selection apparatus for shielding electromagnetic pulse |
| KR101894761B1 (en) * | 2018-05-29 | 2018-10-18 | 주식회사 엠피디 | Cavity filter comprising tunning bolt |
| CN109244612B (en) * | 2018-09-28 | 2024-03-22 | 西南应用磁学研究所 | Miniaturized comb-shaped ceramic tube medium cavity filter |
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- 2010-06-17 WO PCT/KR2010/003931 patent/WO2010147417A2/en active Application Filing
- 2010-06-17 CN CN201080027031.6A patent/CN102804483B/en not_active Expired - Fee Related
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| CN2929980Y (en) * | 2006-07-27 | 2007-08-01 | 奥雷通光通讯设备（上海）有限公司 | Inductive coupling regulating structure between medium loading chambers |
| CN100477373C (en) * | 2006-07-27 | 2009-04-08 | 奥雷通光通讯设备（上海）有限公司 | Capacitive coupling device between medium loading chambers |
| CN200962447Y (en) * | 2006-09-29 | 2007-10-17 | 深圳国人通信有限公司 | Built-in coaxial cavity band resistance filter of the transmission line |
| CN201417811Y (en) * | 2009-06-10 | 2010-03-03 | 大富（深圳）科技有限公司 | Resonating tube and cavity filter with the resonating tube |
| CN101645525A (en) * | 2009-08-07 | 2010-02-10 | 大富（深圳）科技有限公司 | Cavity body filter |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010147417A3 (en) | 2011-02-24 |
| KR101080890B1 (en) | 2011-11-07 |
| CN102804483A (en) | 2012-11-28 |
| WO2010147417A2 (en) | 2010-12-23 |
| KR20100136023A (en) | 2010-12-28 |
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