CN103840239A - Resonant cavity, filter and electromagnetic wave equipment - Google Patents
Resonant cavity, filter and electromagnetic wave equipment Download PDFInfo
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- CN103840239A CN103840239A CN201310001439.1A CN201310001439A CN103840239A CN 103840239 A CN103840239 A CN 103840239A CN 201310001439 A CN201310001439 A CN 201310001439A CN 103840239 A CN103840239 A CN 103840239A
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Abstract
The invention relates to a resonant cavity which comprises a cavity body and a harmonic oscillator located in the cavity body. The resonant cavity is characterized in that the harmonic oscillator comprises a medium body, a concave hole is formed in the surface of the medium body, and a conductive layer formed by conductive materials is arranged in the concave hole; the bottom of the harmonic oscillator is connected with the bottom surface of the cavity body in a locking mode through thread fit. The harmonic oscillator provided with the conductive layer is adopted, a low resonant frequency mode can be obtained, the resonant frequency of the resonant cavity with the harmonic oscillator can be reduced easily, therefore, the size of the resonant cavity is greatly reduced, and the size of a filter with the resonant cavity and the size of electromagnetic wave equipment with the resonant cavity can also be obviously reduced accordingly.
Description
Technical field
The present invention relates to RF Components and equipment thereof, more particularly, relate to a kind of resonant cavity, filtering device and electromagnetic wave device.
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, the volume of dielectric resonance and the volume of wire chamber can be larger, do not meet the demand of filter miniaturization.How designing that a kind of resonance frequency is low, volume is little and resistance to high-power harmonic oscillator and filter thereof, is to need a problem solving.
Summary of the invention
The object of the invention is to, for the above-mentioned defect of prior art, provide that a kind of resonance frequency is low, volume is little and resistance to high-power resonant cavity, filtering device and electromagnetic wave device.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of resonant cavity, comprise cavity, be positioned at the harmonic oscillator of described cavity, described harmonic oscillator comprises medium body, on described medium body surface, offer shrinkage pool, in described shrinkage pool, be provided with the conductive layer that electric conducting material forms, 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, is provided with directly external screw thread or the internal thread of adaptation with it on described cavity bottom surface.
Further, described cavity bottom is provided with boss, and described harmonic oscillator is by coordinating and fix with the internal thread arranging on described boss or external screw thread.
Further, described harmonic oscillator bottom welding or be bonded with metal derby, described metal derby bottom is provided with external screw thread or internal thread, is provided with adaptive with it internal thread or external screw thread on described cavity bottom surface.
Further, described harmonic oscillator bottom is provided with the coat of metal, by welding together with described metal derby hot pressing melting.
Further, described conductive layer is attached directly on described shrinkage pool inwall.
Further, described conductive layer is fixed on the side or bottom surface of described shrinkage pool inwall by connecting medium.
Further, described medium body is greater than 1 material by dielectric constant and makes.
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, or described conductive layer covers in 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, or for containing in silver, copper or gold the alloy of one or both or three kinds.
Further, the electric conducting material of described conductive layer is the nonmetal of conduction.
Further, described electric conducting material is electrically conductive graphite, indium tin oxide or Al-Doped ZnO.
Further, described resonant cavity also comprises and is contained on described cavity and stretches in described cavity body and play tuning tuning plug used, and 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, described tuning plug is that dielectric constant is greater than the screw rod that 1 nonmetallic materials make or is metal screw.
The invention still further relates to a kind of filtering device, comprise one or more resonant cavitys, at least one resonant cavity is above-mentioned resonant cavity.
Further, described filtering device is filter or duplexer.
Further, described filtering device comprises multiple 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, between the resonant cavity of described filtering device and resonant cavity, be the coupling of windowing, and each position of windowing is provided with coupling bar.
The invention still further relates to a kind of electromagnetic wave device, comprise signal emission module, signal receiving module and filtering device, the input of described filtering device is connected with described signal emission module, and output is connected with signal receiving module, and described filtering device is the filtering device described in above-mentioned any one.
Further, described electromagnetic wave device is aircraft, radar, base station or satellite.
Implement the present invention, there is following beneficial effect: the present invention 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 greatly dwindle the volume of resonant cavity, there is the filtering device of this resonant cavity and the volume of electromagnetic wave device also can obviously reduce thereupon.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the vertical view of the harmonic oscillator of the preferred embodiment of the present invention;
Fig. 2 be harmonic oscillator shown in Fig. 1 partly cut open front view;
Fig. 3 be resonant cavity in an embodiment partly cut open vertical view;
Fig. 4 be resonant cavity shown in Fig. 3 partly cut open front view;
Fig. 5 is the B-B profile of the filtering device in an embodiment;
Fig. 6 is the A-A profile of filtering device shown in Fig. 5;
Fig. 7 is the partial structurtes schematic diagram of electromagnetic wave device of the present invention while being base station.
Embodiment
The present invention relates to a kind of resonant cavity, filtering device and electromagnetic wave device, this resonant cavity has low-down resonance frequency, thereby much smaller with traditional resonant cavity phase specific volume of identical resonance frequency, can effectively reduce the filtering device being formed by resonant cavity and there is the volume and weight of the electromagnetic wave device of this filtering device.
Resonant cavity as shown in Figure 3, Figure 4, comprises cavity 5, harmonic oscillator and tuning plug 4.Wherein, chamber lid is housed on cavity 5 openends, cavity and chamber lid enclose an enclosure space, and harmonic oscillator is positioned at described enclosure space.Cavity 5 or chamber cover is equipped with tuning plug 4, and tuning plug 4 ends stretch in enclosure space and stretch at least in part in the shrinkage pool 2 of harmonic oscillator.
Tuning plug 4 is generally metal screw, be contained in chamber and cover, and it is adjustable to stretch into length in chamber, thereby among a small circle, regulate the resonance frequency of resonant cavity by nut.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 present invention not material to tuning plug 4 and shape does any restriction, thereby as long as its stretch into that cavity 5 is interior can perturbation chamber in electromagnetic field distribution affect resonance frequency.Tuning plug 4 also can be made for nonmetallic materials, as long as its dielectric constant is greater than 1, and the certainly preferred higher material of dielectric constant.
Harmonic oscillator as shown in Figure 1 and Figure 2, comprises medium body 1, 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 forms on all surfaces of shrinkage pool 2 inwalls or part surface.
The material that medium body 1 can be greater than 1 for any dielectric constant, such as polytetrafluoroethylene, epoxy resin, F4B, FR4 material etc., but the material that dielectric constant is higher, loss angle tangent is less is more conducive to electromagnetic resonance and reduces resonance frequency, preferably ceramic material in prior art, for example aluminium oxide, certainly as long as the material with higher dielectric constant and lower loss (dielectric constant is greater than 30 conventionally, and loss angle tangent is less than 0.01) all can, preferably such as BaTi of microwave-medium ceramics
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 the present embodiment is rectangle square column, and four rib roundings.Certainly harmonic oscillator is not limited to this shape, medium body 1 of the present invention 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, the characteristic that this does not have influence on harmonic oscillator of the present invention, is not restricted herein.
Certainly, this shrinkage pool 2 differs and is decided to be through hole, can be also blind hole, does not penetrate into another surperficial hole.For example, this blind hole can be, just highly shorter shape identical with any shape of above-mentioned through hole, can be also other shapes as hemisphere, tetrahedroid etc., be not restricted herein.
In the inner wall surface of shrinkage pool 2, be attached with conductive layer 3, conductive layer 3 is made up of the material that can conduct electricity, preferable alloy, for example silver, copper or gold, or for containing in silver, copper or gold the alloy of one or both or three kinds, can be also other metal materials or other metal alloys.Electric conducting material can be also 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 medium, for example adopt viscose glue bonding, or 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, or the material that adds other low-losses, low dielectric between the two is fixed 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 cover the side of shrinkage pool 2 inwalls, the inner wall section being also 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.
In the time that shrinkage pool 2 is through hole, the bottom surface contacting with cavity 5 of medium body 1 can arrange conductor articulamentum, and described conductor articulamentum is that the conductor material identical or different from above-mentioned conductive layer 3 made, and couples together with the conductive layer 3 on through-hole wall.Now 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 frequency reducing effect, on medium body 1, can be provided with two or shrinkage pool 2 more than two, on one of them shrinkage pool 2, to there being a tuning plug 4, certainly in order to increase perturbation quantity, can a tuning plug 4 be all set in the relative position of each shrinkage pool 2.
It is known by above-mentioned resonant cavity is carried out to HFSS emulation, the electric field of the first mode of this resonant cavity is radially outer through medium body 1 central shaft, magnetic field taking this central shaft as center of circle circumferential hoop around, this pattern has very low resonance frequency, therefore pattern corresponding to this resonance frequency is also Main Patterns by the first mode that becomes resonant cavity, frequency corresponding to the higher mode of TE mould that medium body 1 self produces, TM mould, higher mode and cavity 5 self, all far above the frequency of aforementioned first mode, can filter by low pass filter.
In order to strengthen fixing between harmonic oscillator and resonant cavity 5, harmonic oscillator bottom is connected with the locking of cavity bottom surface by threaded engagement.Threaded engagement is to be realized and being locked by internal thread and externally threaded direct assembling, have advantages of be connected firmly, easy accessibility, applicability be wide.
Concrete thread connecting mode has multiple, and one is direct connection, and another kind is indirect connection.
Wherein, directly connect be harmonic oscillator bottom directly arrange on internal thread or external screw thread, cavity 5 bottom surfaces, arrange the external screw thread of corresponding adaptation 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 is less than the external diameter of harmonic oscillator medium body 1, and the female screwed hole of tool is set on boss, can be to be also provided with external screw thread on boss external cylindrical surface.Harmonic oscillator bottom is provided with corresponding external screw thread or internal thread, assembles with it and is locked.Because boss external diameter is less than the external diameter of medium body 1, the edge that can prevent medium body 1 bottom collide with cavity bottom and breakage.
Another kind of connection indirectly, refers on harmonic oscillator or cavity and connects miscellaneous part, relies on the internal thread or the external screw thread that on these parts, arrange to realize the connection between harmonic oscillator, cavity.In embodiment, harmonic oscillator bottom is stained with a metal derby 20, one bolts 10 through the suitable internal thread hole assembly connection on this metal derby 20 and cavity 1 bottom boss by viscose glue as shown in Figure 4.Also can plate the coat of metal in harmonic oscillator bottom, metal derby 10 welds together with harmonic oscillator with having the one side hot pressing melting of the coat of metal.
To the advantage of resonant cavity of the present invention be described by specific experiment data below.Taking single chamber resonant cavity with pure ceramic dielectric harmonic oscillator as comparative example, this ceramic dielectric harmonic oscillator adopts microwave-medium ceramics, the cylinder that is of a size 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.As can be seen here, adopt harmonic oscillator of the present invention, resonance frequency can be reduced to about 800MHz, be essentially the half of original resonance frequency, corresponding meaning, in the time preparing the resonant cavity of identical resonance frequency, cavity volume will significantly reduce.
The feature of the resonant cavity based on above-mentioned single chamber, the invention still further relates to a kind of filtering device, can be such as band pass filter, band stop filter, high pass filter, low pass filter or multiband filter etc. of filter, also can there is for duplexer or other device of filter function, it comprises at least one resonant cavity, and wherein at least one resonant cavity is above-mentioned resonant cavity.
Taking the multicavity filter shown in Fig. 5, Fig. 6 as example, the filter shown in Fig. 5 is the filter with six resonant cavitys.Input 8 and output 9 are equipped with respectively in cavity 5 two ends.As shown in Figure 6, medium body 1 and the cavity 5 of harmonic oscillator adopt direct-connected mode, and cavity 5 bottoms are provided with external thread column 30, integral with the direct assembly connection of internal thread of medium body 1 bottom.The volume size of harmonic oscillator should meet this medium body 1 can be around these external thread column 30 rotational locks in cavity 5.
In order to strengthen coupling, between chamber and chamber, intercommunication completely, does not arrange barrier, can be understood as between chamber and chamber yet and is coupled and windows on earth for windowing; Meanwhile, multiple harmonic oscillators link into an integrated entity by bridging part 7 as shown in Figure 5 successively.Described bridging part 7 can be that the material identical with medium body 1 made, and can be also that different materials is made, and directly the mode of bridge joint can strengthen coupling.Further, each position of windowing is also provided with coupling bar 6, and the length stretching in chamber by coupling bar 6 also can regulate coupling strong and weak.
As shown in Figure 5, each harmonic oscillator as described above, has shrinkage pool 2 and is attached to the conductive layer 3 on shrinkage pool 2 inwalls, and each shrinkage pool 2 correspondences are provided with a tuning plug 4 and insert in shrinkage pool 2.Known by HFSS emulation, the electric field of this filter first mode 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 TE mould that medium body 1 produces, TM mould, higher mode and cavity 5 self all from the frequency of first mode away from, can filter by low pass filter.
And then the present invention also protects a kind of electromagnetic wave device with above-mentioned filtering device, this electromagnetic wave device can be any equipment that need to use filtering device, such as aircraft, radar, base station, satellite etc.These electromagnetic wave devices can receive and transmitted signal, and carry out filtering after receiving or before sending, so that the signal that institute receives or sends satisfies the demands, therefore electromagnetic wave device at least also comprises the signal emission module being connected with the input of filtering device, the signal receiving module being connected with the output of filtering device.
For example, as shown in Figure 7, electromagnetic wave device is base station, and base station comprises the duplexer as filtering device, and duplexer comprises post a letter band pass filter and collection of letters band pass filter.Post a letter band pass filter input connect sender, output connect antenna for base station; The input of collection of letters band pass filter connects antenna for base station, and output connects receiver.
, 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, signal receiving module is receiver.
The present invention 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 greatly dwindle the volume of resonant cavity, there is the filtering device of this resonant cavity and the volume of electromagnetic wave device also can obviously reduce thereupon.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not departing from the scope situation that aim of the present invention and claim protect, also can make a lot of forms, within these all belong to protection of the present invention.
Claims (23)
1. a resonant cavity, comprise cavity, be positioned at the harmonic oscillator of described cavity, it is characterized in that, described harmonic oscillator comprises medium body, on described medium body surface, offer shrinkage pool, in described shrinkage pool, be provided with the conductive layer that electric conducting material forms, 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, is provided with directly external screw thread or the internal thread of adaptation with it on described cavity bottom surface.
3. resonant cavity according to claim 2, is characterized in that, described cavity bottom is provided with boss, and described harmonic oscillator is by coordinating and fix with the internal thread arranging on described boss or external screw thread.
4. resonant cavity according to claim 1, is characterized in that, described harmonic oscillator bottom welding or be bonded with metal derby, and described metal derby bottom is provided with external screw thread or internal thread, is provided with adaptive with it internal thread or external screw thread on described cavity bottom surface.
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 melting.
6. harmonic oscillator according to claim 1, is characterized in that, described conductive layer is attached directly on described shrinkage pool inwall.
7. harmonic oscillator 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 medium.
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, or described conductive layer covers in 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 cavitys according to claim 10, is characterized in that, described electric conducting material is silver, copper or gold, or for containing in silver, copper or gold the alloy of one or both or three kinds.
12. resonant cavitys according to claim 1, is characterized in that, the electric conducting material of described conductive layer is the nonmetal of conduction.
13. resonant cavitys 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 cavitys according to claim 1, is characterized in that, described resonant cavity also comprises and be contained on described cavity and stretch in described cavity body and play tuning tuning plug used, and described tuning plug and described shrinkage pool arrange in opposite directions.
15. resonant cavitys 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 cavitys according to claim 1, is characterized in that, described tuning plug is that dielectric constant is greater than the screw rod that 1 nonmetallic materials make or is metal screw.
17. 1 kinds of filtering devices, comprise one or more resonant cavitys, it is characterized in that, at least one resonant cavity is the resonant cavity as described in claim 1 to 16 any one.
18. filtering devices according to claim 17, is characterized in that, described filtering device is filter or duplexer.
19. filtering devices according to claim 17, is characterized in that, described filtering device comprises multiple resonant cavitys, are 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 devices according to claim 19, is characterized in that, be the coupling of windowing, and each position of windowing are provided with coupling bar between the resonant cavity of described filtering device and resonant cavity.
21. cavity body filters 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. 1 kinds of electromagnetic wave devices, 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 the filtering device as described in claim 17 to 21 any one.
23. electromagnetic wave devices according to claim 22, is characterized in that, described electromagnetic wave device is aircraft, radar, base station or satellite.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310001439.1A CN103840239A (en) | 2012-11-20 | 2013-01-04 | Resonant cavity, filter and electromagnetic wave equipment |
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| CN201210590201.2 | 2012-11-20 | ||
| CN201210590201 | 2012-11-20 | ||
| CN201310001439.1A CN103840239A (en) | 2012-11-20 | 2013-01-04 | Resonant cavity, filter and electromagnetic wave equipment |
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| CN103840239A true CN103840239A (en) | 2014-06-04 |
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| CN201310001439.1A Pending CN103840239A (en) | 2012-11-20 | 2013-01-04 | Resonant cavity, filter and electromagnetic wave equipment |
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| CN107615579A (en) * | 2015-05-20 | 2018-01-19 | 华为技术有限公司 | Wave filter and electromagnetic equipment |
| CN110908269A (en) * | 2018-09-18 | 2020-03-24 | 中国计量科学研究院 | Microwave resonator for cold atom fountain clock |
| WO2021092716A1 (en) * | 2019-11-11 | 2021-05-20 | 华为技术有限公司 | Resonator, and filter |
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