CN203119077U - Resonant cavity, filtering device and electromagnetic wave equipment - Google Patents
Resonant cavity, filtering device and electromagnetic wave equipment Download PDFInfo
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- CN203119077U CN203119077U CN 201320002616 CN201320002616U CN203119077U CN 203119077 U CN203119077 U CN 203119077U CN 201320002616 CN201320002616 CN 201320002616 CN 201320002616 U CN201320002616 U CN 201320002616U CN 203119077 U CN203119077 U CN 203119077U
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- resonant cavity
- filtering device
- harmonic oscillator
- shrinkage pool
- cavity
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Abstract
The utility model relates to a resonant cavity, which comprises a cavity and harmonic oscillators located in the cavity. The resonant cavity is characterized in that the harmonic oscillator comprises a medium body, the surface of the medium body is provided with a concave hole, the concave hole is internally provided with a conductive layer formed by a conductive material, and the bottom part of the harmonic oscillator is locked with the bottom surface of the cavity through screw thread fit. As adoption of the harmonic oscillator with the conductive layer, a mode with low resonant frequency can be obtained, thereby being conducive to reducing the resonant frequency of the resonant cavity provided with the harmonic oscillator, greatly reducing the size of the resonant cavity, and then reducing the size of a filtering device and electromagnetic wave equipment provided with the resonant cavity significantly.
Description
Technical field
The utility model relates to radio frequency components and parts and equipment thereof, more particularly, relates to a kind of resonant cavity, filtering device and electromagnetic wave equipment.
Background technology
Conventional metals harmonic oscillator filter volume is little and can realize the resonance of lower frequency, but the little meeting of volume causes bearing higher power.Traditional dielectric resonance subfilter can be born high power, but if realize low-frequency resonant, then the volume of the volume of dielectric resonance and wire chamber can be bigger, do not satisfy the demand of filter miniaturization.How designing that a kind of resonance frequency is low, volume is little and anti-high-power harmonic oscillator and filter thereof, is to need a problem solving.
The utility model content
The purpose of this utility model is, at the above-mentioned defective of prior art, provides that a kind of resonance frequency is low, volume is little and anti-high-power resonant cavity, filtering device and electromagnetic wave equipment.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of resonant cavity, comprise cavity, be positioned at the harmonic oscillator of described cavity, described harmonic oscillator comprises the medium body, offer shrinkage pool on the described medium body surface, be provided with the conductive layer that electric conducting material constitutes in the described shrinkage pool, described harmonic oscillator bottom is connected with the locking of described cavity bottom surface by threaded engagement.
Further, described harmonic oscillator bottom is provided with internal thread or external screw thread, and described cavity bottom surface is provided with directly adaptive with it external screw thread or internal thread.
Further, described cavity bottom is provided with boss, and described harmonic oscillator is fixed by cooperating with the internal thread that arranges or external screw thread on the described boss.
Further, metal derby is welded or be bonded with in described harmonic oscillator bottom, and described metal derby bottom is provided with external screw thread or internal thread, and described cavity bottom surface is provided with adaptive with it internal thread or external screw thread.
Further, described harmonic oscillator bottom is provided with the coat of metal, by welding together with described metal derby hot pressing fusion.
Further, described conductive layer is attached directly on the described shrinkage pool inwall.
Further, described conductive layer is fixed on the side or bottom surface of described shrinkage pool inwall by connecting media.
Further, described medium body is made greater than 1 material by dielectric constant.
Further, described shrinkage pool is blind hole or through hole.
Further, described shrinkage pool is circular port, square opening, truncated cone-shaped hole, square platform shape hole, bellmouth or erose hole.
Further, described conductive layer covers on the side or bottom surface of described shrinkage pool inwall, and perhaps described conductive layer covers on the whole inner wall surface of shrinkage pool inwall.
Further, the electric conducting material of described conductive layer is metal.
Further, described electric conducting material is silver, copper or gold, perhaps for containing in silver, copper or the gold alloy of one or both or three kinds.
Further, the electric conducting material of described conductive layer is nonmetal for what conduct electricity.
Further, described electric conducting material is electrically conductive graphite, indium tin oxide or Al-Doped ZnO.
Further, described resonant cavity comprises also and is contained on the described cavity and stretches in the described cavity chamber and to play tuning used tuning plug that described tuning plug and described shrinkage pool arrange in opposite directions.
Further, described medium body is provided with at least two shrinkage pools, and the position relative with each shrinkage pool is equipped with a tuning plug.
Further, the described tuning plug screw rod that to be dielectric constant make greater than 1 nonmetallic materials or be metal screw.
The utility model also relates to a kind of filtering device, comprises one or more resonant cavitys, and at least one resonant cavity is above-mentioned resonant cavity.
Further, described filtering device is filter or duplexer.
Further, described filtering device comprises a plurality of resonant cavitys, is provided with a described harmonic oscillator in each resonant cavity, and the shrinkage pool correspondence of each harmonic oscillator is provided with a tuning plug.
Further, be the coupling of windowing between the resonant cavity of described filtering device and the resonant cavity, and each position of windowing is provided with coupling bar.
The utility model also relates to a kind of electromagnetic wave equipment, comprise signal emission module, signal receiving module and filtering device, the input of described filtering device is connected with described signal emission module, output is connected with signal receiving module, and described filtering device is above-mentioned each described filtering device.
Further, described electromagnetic wave equipment is aircraft, radar, base station or satellite.
Implement the utility model, have following beneficial effect: the utility model is because employing has the harmonic oscillator of conductive layer, can obtain a pattern that resonance frequency is lower, be conducive to reduce the resonance frequency of the resonant cavity with this harmonic oscillator, thereby dwindle the volume of resonant cavity greatly, have the filtering device of this resonant cavity and the volume of electromagnetic wave equipment and also can obviously reduce thereupon.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the vertical view of the harmonic oscillator of the utility model preferred embodiment;
Fig. 2 be harmonic oscillator shown in Figure 1 partly cut open front view;
Fig. 3 be among the embodiment resonant cavity partly cut open vertical view;
Fig. 4 be resonant cavity shown in Figure 3 partly cut open front view;
Fig. 5 is the B-B profile of the filtering device among the embodiment;
Fig. 6 is the A-A profile of filtering device shown in Figure 5;
Partial structurtes schematic diagram when Fig. 7 is the base station for electromagnetic wave equipment of the present utility model.
Embodiment
The utility model relates to a kind of resonant cavity, filtering device and electromagnetic wave equipment, this resonant cavity has low-down resonance frequency, thereby much smaller with traditional resonant cavity phase specific volume of identical resonance frequency, the volume and weight that can effectively reduce the filtering device that is constituted by resonant cavity and have the electromagnetic wave equipment of this filtering device.
Resonant cavity comprises cavity 5, harmonic oscillator and tuning plug 4 as shown in Figure 3, Figure 4.Wherein, the chamber lid is housed on cavity 5 openends, cavity and chamber lid are enclosed an enclosure space, and harmonic oscillator namely is positioned at described enclosure space.Cavity 5 or chamber cover is equipped with tuning plug 4, and tuning plug 4 ends stretch in the enclosure space and stretch at least in part in the shrinkage pool 2 of harmonic oscillator.
Tuning plug 4 is generally metal screw, is contained in the chamber by nut and covers, and stretch into adjustable length in the chamber, thereby regulate the resonance frequency of resonant cavity among a small circle.Tuning plug 4 also can have ceramic material to make, or the rod outer surface coated metal of making at a low-loss material or pottery or other high dielectric constant materials.The utility model is not done any restriction to material and the shape of tuning plug 4, thereby the electromagnetic field distribution influences resonance frequency in the cavity 5 interior energy perturbation chambeies as long as it stretches into.Tuning plug 4 also can be made for nonmetallic materials, needs only its dielectric constant greater than 1, the certainly preferred higher material of dielectric constant.
Harmonic oscillator comprises medium body 1 as shown in Figure 1 and Figure 2, offers the shrinkage pool 2 of guided media body 1 inner recess on medium body 1 outer surface, is attached with the conductive layer 3 that electric conducting material constitutes on all surfaces of shrinkage pool 2 inwalls or the part surface.
Medium body 1 can for any dielectric constant greater than 1 material, for example polytetrafluoroethylene, epoxy resin, F4B, FR4 material etc., but the material that dielectric constant is more high, loss angle tangent is more little more is conducive to electromagnetic resonance and reduces resonance frequency, preferably ceramic material in the prior art, aluminium oxide for example, certainly so long as the material with higher dielectric constant and lower loss (dielectric constant is greater than 30 usually, and loss angle tangent is less than 0.01) all can, preferred microwave-medium ceramics is BaTi for example
4O
9, Ba
2Ti
9O
20, MgTiO
3-CaTiO
3, BaO-Ln
2O
3-TiO
2System, Bi
2O
3-ZnO-Nb
2O
5System etc.
As shown in Figure 1, the medium body 1 of present embodiment is the rectangle square column, and four rib roundings.Certainly harmonic oscillator is not limited to this shape, medium body 1 of the present utility model can be the shape that existing any one harmonic oscillator has, for example cylindrical, square shape sheet, truncated cone-shaped, square halfpace, or other any regular or irregularly shaped, this does not have influence on the characteristic of harmonic oscillator of the present utility model, and this paper is not restricted.
Shrinkage pool 2 shown in Figure 2 is through hole, and namely this shrinkage pool 2 is penetrated into another surface from a surface of medium body 1.The through hole of present embodiment is cylindrical hole, and preferably the center line of this cylindrical hole is positioned on the central shaft of medium body 1, can be so that the symmetrical distribution of the electromagnetic field in the cavity when harmonic oscillator is placed on resonant cavity central authorities.Through hole also can be cylindrical, square column type, truncated cone-shaped, square halfpace, taper or other rule or irregular shape, thereby or with the conformal thick structure such as 1 one-tenth of medium body that makes of the outline of medium body 1.
Certainly, this shrinkage pool 2 differs and is decided to be through hole, also can be blind hole, does not namely penetrate into another surperficial hole.For example, this blind hole can also can be other shapes such as hemisphere, tetrahedroid etc. for, just height short shape identical with any shape of above-mentioned through hole, and this paper is not restricted.
Inner wall surface at shrinkage pool 2 is attached with conductive layer 3, conductive layer 3 is made of the material that can conduct electricity, preferable alloy, for example silver, copper or gold, for containing in silver, copper or the gold alloy of one or both or three kinds, also can be other metal materials or other metal alloys perhaps.Electric conducting material also can be can conduct electricity nonmetal, for example electrically conductive graphite, indium tin oxide or Al-Doped ZnO.Conductive layer 3 can be to be attached directly to as mentioned above on shrinkage pool 2 inwalls, also can be arranged on shrinkage pool 2 inside by connecting media, for example adopt viscose glue bonding, perhaps connecting rod one end is connected with conductive layer 3, the other end and shrinkage pool 2 inwalls are fixed, make to be separated with air layer between conductive layer 3 and shrinkage pool 2 inwalls, perhaps between the two, add the material of other low-losses, low dielectric and fix the two.
The scope that conductive layer 3 covers can be whole shrinkage pool 2 inner wall surface, can be the part surface of shrinkage pool 2 inwalls, for example only covers the side of shrinkage pool 2 inwalls, also the inner wall section that namely is connected with shrinkage pool 2 open ends; Also can only cover the bottom surface of shrinkage pool 2, i.e. the inner wall section that with this openend be not connected relative with shrinkage pool 2 open ends; Or, be coated with the subregion of side and the subregion of bottom surface simultaneously.
When shrinkage pool 2 was through hole, the bottom surface that contacts with cavity 5 of medium body 1 can arrange the conductor articulamentum, and described conductor articulamentum is made for the conductor material identical or different with above-mentioned conductive layer 3, and coupled together with conductive layer 3 on the through-hole wall.This moment, this conductor articulamentum can be fixed with one by hot pressing or welding or other known interconnection techniques and cavity 5.
In order to strengthen the frequency reducing effect, can be provided with two or more than two shrinkage pool 2 on the medium body 1, to a tuning plug 4 should be arranged, in order to increase perturbation quantity, can a tuning plug 4 all be set in each shrinkage pool 2 relative position certainly on one of them shrinkage pool 2.
By above-mentioned resonant cavity is carried out HFSS emulation as can be known, the electric field of first pattern of this resonant cavity is radially outer through medium body 1 central shaft, magnetic field then with this central shaft be center of circle circumferential hoop around, this pattern has very low resonance frequency, therefore will to become first pattern of resonant cavity also be main pattern to the pattern of this resonance frequency correspondence, the frequency of the higher mode correspondence of the TE mould that medium body 1 self produces, TM mould, higher mode and cavity 5 self can filter by low pass filter all far above the frequency of aforementioned first pattern.
In order to strengthen fixing between harmonic oscillator and the resonant cavity 5, the harmonic oscillator bottom is connected with the locking of cavity bottom surface by threaded engagement.Threaded engagement is to realize being locked by internal thread and externally threaded direct assembling, have be connected firmly, easy accessibility, advantage that applicability is wide.
Concrete thread connecting mode has multiple, and a kind of is direct connection, and another kind is indirect connection.
Wherein, directly connect be the harmonic oscillator bottom directly arrange arrange on internal thread or external screw thread, cavity 5 bottom surfaces corresponding adaptive external screw thread or internal thread, the two directly assembling be connected and fixed.For example, be provided with boss in cavity 5 bottoms, the diameter of boss arranges the screwed hole with internal thread less than the external diameter of harmonic oscillator medium body 1 on the boss, also can be that the boss external cylindrical surface is provided with external screw thread.Harmonic oscillator bottom is provided with corresponding external screw thread or internal thread, assembles with it and is locked.Because the boss external diameter, can prevent the edge of medium body 1 bottom collide with cavity bottom and breakage less than the external diameter of medium body 1.
Another kind of connect indirectly, refer to connect miscellaneous part on harmonic oscillator or the cavity, rely on the internal thread that arranges on these parts or external screw thread to realize connection between harmonic oscillator, the cavity.As shown in Figure 4 among the embodiment, the harmonic oscillator bottom is stained with a metal derby 20, one bolts 10 by viscose glue and passes this metal derby 20 and assemble with suitable internal thread hole on the cavity 1 bottom boss and be connected.Also can plate the coat of metal in the harmonic oscillator bottom, metal derby 10 welds together with harmonic oscillator with having the one side hot pressing fusion of the coat of metal.
Below the advantage of resonant cavity of the present utility model will be described by concrete experimental data.Be Comparative Examples with a single chamber resonant cavity with pure ceramic dielectric harmonic oscillator, this ceramic dielectric harmonic oscillator adopts microwave-medium ceramics, be of a size of the cylinder of external diameter 24mm, internal diameter 8mm, high 19mm, the corresponding through hole of internal diameter, the resonance frequency that experiment records the resonant cavity with this harmonic oscillator is 1.642GHz.Adopt identical cavity and harmonic oscillator (above-mentioned pure ceramic dielectric harmonic oscillator is as the medium body of harmonic oscillator in this example), and plating silver (being the conductive layer in this example) at the through hole (being the shrinkage pool in this example) of this harmonic oscillator, experiment records the resonance frequency of the resonant cavity with this harmonic oscillator and is down to 0.875GHz.This shows, adopt harmonic oscillator of the present utility model, resonance frequency can be reduced about 800MHz, be essentially half of original resonance frequency, corresponding meaning, when preparing the resonant cavity of identical resonance frequency, cavity volume will reduce significantly.
Characteristics based on the resonant cavity in above-mentioned single chamber, the utility model also relates to a kind of filtering device, can be filter for example band pass filter, band stop filter, high pass filter, low pass filter or multiband filter etc., also can have the device of filter function for duplexer or other, it comprises at least one resonant cavity, and wherein at least one resonant cavity is above-mentioned resonant cavity.
Be example with Fig. 5, multicavity filter shown in Figure 6, filter shown in Figure 5 is the filter with six resonant cavitys.Cavity 5 two ends are equipped with input 8 and output 9 respectively.As shown in Figure 6, the medium body 1 of harmonic oscillator adopts direct-connected mode with cavity 5, and cavity 5 bottoms are provided with external screw thread post 30, links into an integrated entity with the direct assembling of the internal thread of medium body 1 bottom.The volume size of harmonic oscillator should satisfy this medium body 1 can be around these external screw thread post 30 rotational locks in cavity 5.
In order to strengthen coupling, intercommunication does not fully arrange barrier between chamber and the chamber, can be understood as between chamber and the chamber to be coupled and to window on earth for windowing yet; Simultaneously, a plurality of harmonic oscillators link into an integrated entity by bridging part 7 as shown in Figure 5 successively.Described bridging part 7 can be to make with medium body 1 identical materials, also can be that different materials is made, and directly the mode of bridge joint can strengthen coupling.Further, each position of windowing also is provided with coupling bar 6, also can regulate the coupling power by the length that coupling bar 6 stretches in the chamber.
As shown in Figure 5, each harmonic oscillator is as indicated above, has shrinkage pool 2 and the conductive layer 3 that is attached on shrinkage pool 2 inwalls, and each shrinkage pool 2 correspondence is provided with in a tuning plug 4 insertion shrinkage pools 2.By HFSS emulation as can be known, the electric field of this filter first pattern is circumferentially radially outer along harmonic oscillator, magnetic field be along circumferential around, the frequency of this pattern is low, can be used as the band connection frequency of filter.The higher mode of the TE mould that medium body 1 produces, TM mould, higher mode and cavity 5 self all from the frequency of first pattern away from, can filter by low pass filter.
And then the utility model is also protected a kind of electromagnetic wave equipment with above-mentioned filtering device, and this electromagnetic wave equipment can be the equipment that any needs are used filtering device, for example aircraft, radar, base station, satellite etc.These electromagnetic wave equipment can receive and send signal, and after receiving or before sending, carry out filtering, so that institute's signal of receiving or sending satisfies the demands, so electromagnetic wave equipment at least also comprises the signal emission module that is connected with the input of filtering device, the signal receiving module that is connected with the output of filtering device.
For example, as shown in Figure 7, electromagnetic wave equipment is the base station, and the base station comprises the duplexer as filtering device, and duplexer comprises post a letter band pass filter and collection of letters band pass filter.The input of band pass filter of posting a letter connects sender, and output connects antenna for base station; The input of collection of letters band pass filter connects antenna for base station, and output connects receiver.
Then for the band pass filter of posting a letter, its signal emission module is sender, and signal receiving module is antenna for base station.And for collection of letters band pass filter, its signal emission module is antenna for base station, and signal receiving module is receiver.
The utility model is because employing has the harmonic oscillator of conductive layer 3, can obtain a pattern that resonance frequency is lower, be conducive to reduce the resonance frequency of the resonant cavity with this harmonic oscillator, thereby dwindle the volume of resonant cavity greatly, have the filtering device of this resonant cavity and the volume of electromagnetic wave equipment and also can obviously reduce thereupon.
By reference to the accompanying drawings embodiment of the present utility model is described above; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; not breaking away under the scope situation that the utility model aim and claim protect, also can make a lot of forms, these all belong within the protection of the present utility model.
Claims (23)
1. resonant cavity, comprise cavity, be positioned at the harmonic oscillator of described cavity, it is characterized in that, described harmonic oscillator comprises the medium body, offer shrinkage pool on the described medium body surface, be provided with the conductive layer that electric conducting material constitutes in the described shrinkage pool, described harmonic oscillator bottom is connected with the locking of described cavity bottom surface by threaded engagement.
2. resonant cavity according to claim 1 is characterized in that, described harmonic oscillator bottom is provided with internal thread or external screw thread, and described cavity bottom surface is provided with directly adaptive with it external screw thread or internal thread.
3. resonant cavity according to claim 2 is characterized in that, described cavity bottom is provided with boss, and described harmonic oscillator is fixed by cooperating with the internal thread that arranges or external screw thread on the described boss.
4. resonant cavity according to claim 1 is characterized in that, metal derby is welded or be bonded with in described harmonic oscillator bottom, and described metal derby bottom is provided with external screw thread or internal thread, and described cavity bottom surface is provided with adaptive with it internal thread or external screw thread.
5. resonant cavity according to claim 4 is characterized in that, described harmonic oscillator bottom is provided with the coat of metal, by welding together with described metal derby hot pressing fusion.
6. resonant cavity according to claim 1 is characterized in that, described conductive layer is attached directly on the described shrinkage pool inwall.
7. resonant cavity according to claim 1 is characterized in that, described conductive layer is fixed on the side or bottom surface of described shrinkage pool inwall by connecting media.
8. resonant cavity according to claim 1 is characterized in that, described shrinkage pool is blind hole or through hole.
9. resonant cavity according to claim 1 is characterized in that, described conductive layer covers on the side or bottom surface of described shrinkage pool inwall, and perhaps described conductive layer covers on the whole inner wall surface of shrinkage pool inwall.
10. resonant cavity according to claim 1 is characterized in that, the electric conducting material of described conductive layer is metal.
11. resonant cavity according to claim 10 is characterized in that, described electric conducting material is silver, copper or gold, perhaps for containing in silver, copper or the gold alloy of one or both or three kinds.
12. resonant cavity according to claim 1 is characterized in that, the electric conducting material of described conductive layer is nonmetal for conduction.
13. resonant cavity according to claim 12 is characterized in that, described electric conducting material is electrically conductive graphite, indium tin oxide or Al-Doped ZnO.
14. resonant cavity according to claim 1 is characterized in that, described resonant cavity comprises also and is contained on the described cavity and stretches in the described cavity chamber and to play tuning used tuning plug that described tuning plug and described shrinkage pool arrange in opposite directions.
15. resonant cavity according to claim 14 is characterized in that, described medium body is provided with at least two shrinkage pools, and the position relative with each shrinkage pool is equipped with a tuning plug.
16. resonant cavity according to claim 1 is characterized in that, the described tuning plug screw rod that to be dielectric constant make greater than 1 nonmetallic materials or be metal screw.
17. a filtering device comprises one or more resonant cavitys, it is characterized in that, at least one resonant cavity is as any described resonant cavity of claim 1 to 16.
18. filtering device according to claim 17 is characterized in that, described filtering device is filter or duplexer.
19. filtering device according to claim 17 is characterized in that, described filtering device comprises a plurality of resonant cavitys, is provided with a described harmonic oscillator in each resonant cavity, and the shrinkage pool correspondence of each harmonic oscillator is provided with a tuning plug.
20. filtering device according to claim 19 is characterized in that, be the coupling of windowing between the resonant cavity of described filtering device and the resonant cavity, and each position of windowing is provided with coupling bar.
21. filtering device according to claim 17 is characterized in that, described filtering device is band pass filter, band stop filter, high pass filter, low pass filter or multiband filter.
22. electromagnetic wave equipment, comprise signal emission module, signal receiving module and filtering device, the input of described filtering device is connected with described signal emission module, output is connected with signal receiving module, it is characterized in that described filtering device is as any described filtering device of claim 17 to 21.
23. electromagnetic wave equipment according to claim 22 is characterized in that, described electromagnetic wave equipment is aircraft, radar, base station or satellite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320002616 CN203119077U (en) | 2012-11-20 | 2013-01-04 | Resonant cavity, filtering device and electromagnetic wave equipment |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220747400.5 | 2012-11-20 | ||
| CN201220747400 | 2012-11-20 | ||
| CN 201320002616 CN203119077U (en) | 2012-11-20 | 2013-01-04 | Resonant cavity, filtering device and electromagnetic wave equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203119077U true CN203119077U (en) | 2013-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320002616 Expired - Lifetime CN203119077U (en) | 2012-11-20 | 2013-01-04 | Resonant cavity, filtering device and electromagnetic wave equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840239A (en) * | 2012-11-20 | 2014-06-04 | 深圳光启创新技术有限公司 | Resonant cavity, filter and electromagnetic wave equipment |
| CN108933311A (en) * | 2018-07-02 | 2018-12-04 | 湖北楚航电子科技有限公司 | A kind of cavity body filter of multi-resmator combination |
| CN109672013A (en) * | 2018-11-27 | 2019-04-23 | 京信通信系统（中国）有限公司 | Duplexer and its filter |
-
2013
- 2013-01-04 CN CN 201320002616 patent/CN203119077U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840239A (en) * | 2012-11-20 | 2014-06-04 | 深圳光启创新技术有限公司 | Resonant cavity, filter and electromagnetic wave equipment |
| CN108933311A (en) * | 2018-07-02 | 2018-12-04 | 湖北楚航电子科技有限公司 | A kind of cavity body filter of multi-resmator combination |
| CN109672013A (en) * | 2018-11-27 | 2019-04-23 | 京信通信系统（中国）有限公司 | Duplexer and its filter |
| CN109672013B (en) * | 2018-11-27 | 2020-09-29 | 京信通信技术(广州)有限公司 | Duplexer and filter thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130807 |
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| CX01 | Expiry of patent term |