CN203119076U - Resonant cavity, filtering device and electromagnetic wave equipment - Google Patents
Resonant cavity, filtering device and electromagnetic wave equipment Download PDFInfo
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- CN203119076U CN203119076U CN 201320002530 CN201320002530U CN203119076U CN 203119076 U CN203119076 U CN 203119076U CN 201320002530 CN201320002530 CN 201320002530 CN 201320002530 U CN201320002530 U CN 201320002530U CN 203119076 U CN203119076 U CN 203119076U
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- resonant cavity
- filtering device
- shrinkage pool
- harmonic oscillator
- conductive layer
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Abstract
The utility model relates to a resonant cavity, which comprises a cavity, ports and a harmonic oscillator located in the cavity. The harmonic oscillator comprises a medium body and concave holes reserved in the surface of the medium body, wherein the concave hole is internally provided with a conductive layer made of a conductive material. The ports are installed on the cavity and extend into the cavity, wherein the tail end of the port is a free end. Adoption of the harmonic oscillator with the conductive layer is conducive to reducing the resonant frequency of the resonant cavity provided with the harmonic oscillator, thereby greatly reducing the size of the resonant cavity, and obviously reducing the size of a filtering device and electromagnetic wave equipment provided with the resonant cavity. The ports of the filtering devices are designed to be in an electric coupling mode, the closer the coupling antenna approaches an open circuit end in electric coupling, the stronger the coupling becomes and the lower a load Q value is. The shorter the distance between the antenna and the harmonic oscillator becomes, the stronger the coupling is.
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 to design that a kind of resonance frequency is low, volume is little and the port coupled modes of anti-high-power filter and this kind filter are 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: a kind of resonant cavity, comprise the port at cavity, cavity two ends and be positioned at the harmonic oscillator of cavity, described harmonic oscillator comprises the medium body, is opened in the shrinkage pool on the described medium body surface, is provided with the conductive layer that electric conducting material constitutes in the described shrinkage pool; Described port is contained on the described cavity and stretches in the cavity, and the end of described port is free end.
The free end of described port also connects a Metallic rod or a sheet metal.
Described port is by described Metallic rod or described sheet metal and described harmonic oscillator formation electric coupling.
Described conductive layer is attached directly on the described shrinkage pool inwall.
Described conductive layer is by connecting side or the chamber, bottom surface that media is fixed on described shrinkage pool inwall.
Described medium body is made greater than 1 material by dielectric constant.
Described medium body is made by ceramic material.
Described shrinkage pool is blind hole or through hole.
Described conductive layer is metal cylinder, and described medium body is tubular and is set in outside the described metal cylinder.
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.
The electric conducting material of described conductive layer is metal.
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.
The electric conducting material of described conductive layer is nonmetal for conduction.
Described electric conducting material is electrically conductive graphite, indium tin oxide or Al-Doped ZnO.
Described resonant cavity comprises also and is contained on the described cavity and stretches into and play tuning used tuning plug in the described cavity that the shrinkage pool on described tuning plug and the described medium body arranges in opposite directions.
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.
The described tuning plug screw rod that to be dielectric constant make greater than 1 nonmetallic materials or be metal screw.
Described shrinkage pool is through hole, and is attached with the conductor articulamentum on the medium body surface that described through hole is connected.
The inwall of described conductor articulamentum and described resonant cavity is connected to one by welding or hot pressing or threaded engagement or bonding mode.
A kind of filtering device comprises one or more resonant cavitys, and at least one described resonant cavity is resonant cavity described above.
Described filtering device is filter or duplexer.
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.
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.
A kind of electromagnetic wave equipment comprises signal emission module, signal receiving module and filtering device, and 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 filtering device described above.
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; And the port design of filtering device becomes the mode of electric coupling, and coupled antenna is more strong the closer to the open end coupling during electric coupling, and year Q value is more low; The more near coupling of antenna distance harmonic oscillator is more strong.
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 cutaway top view of first kind of embodiment resonant cavity of the utility model;
Fig. 2 is the sectional plan view of resonant cavity shown in Figure 1;
Fig. 3 is the cutaway top view of second kind of embodiment resonant cavity of the utility model;
Fig. 4 is the sectional plan view of resonant cavity shown in Figure 3;
Fig. 5 is the vertical view of the utility model harmonic oscillator;
Fig. 6 is the sectional plan view of harmonic oscillator shown in Figure 5;
Fig. 7 is the profile of the filtering device of first kind of embodiment;
Fig. 8 is the profile of the filtering device of second kind of embodiment;
Partial structurtes schematic diagram when Fig. 9 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, use harmonic oscillator of the present utility model can make resonant cavity have low-down resonance frequency, thereby it is 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, and the port design of filtering device becomes the mode of electric coupling.
The resonant cavity of the utility model embodiment as shown in Figure 1, 2, comprise cavity 5, cavity 5 two ends port (input 8 and output 9), be contained in the cavity hatch end chamber lid, be positioned at harmonic oscillator and the tuning plug 4 of cavity 5.Wherein, cavity and chamber lid are enclosed an enclosure space, and above-mentioned harmonic oscillator namely is positioned at described enclosure space, and its bottom can support harmonic oscillator by the supporting base that a low-loss material is made, and is located at the centre of enclosure space.Port is contained on the cavity 5 and stretches in the cavity, and the end of port is free end, and the free end of port also connects a Metallic rod 10, and port forms electric coupling by Metallic rod 10 and harmonic oscillator; Shown in Fig. 3,4, be the resonant cavity of the another kind of connected mode of port, the free end of port also connects a sheet metal 11, and port forms electric coupling by sheet metal 11 and harmonic oscillator.Coupled antenna is more strong the closer to the open end coupling during electric coupling, and year Q value is more low; The more near coupling of antenna distance harmonic oscillator is more strong.
Wherein the harmonic oscillator of the utility model embodiment is shown in Fig. 5,6, comprise medium body 1, offer the shrinkage pool 2 of guided media body 1 inner recess on medium body 1 outer surface, all surfaces of shrinkage pool 2 inwalls or part surface are provided with the conductive layer 3 that electric conducting material constitutes.
As shown in Figure 5, 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.
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.These metal or metal alloy can be by plating, evaporation, make paillon foil after heat pressure, liquid liquation waters mode such as fill out and is attached on shrinkage pool 2 inwalls.Electric conducting material also can be can conduct electricity nonmetal, for example electrically conductive graphite, indium tin oxide or Al-Doped ZnO.These nonmetallic materials can be utilized existing corresponding technology, and for example electron beam evaporation, physical vapour deposition (PVD), sputtering sedimentation wait to be attached on shrinkage pool 2 inwalls.
In the present embodiment, medium body 1 is the cylindrical shape of even uniform thickness, and middle shrinkage pool is through hole.Conductive layer 3 is for having certain thickness metal cylinder, and the bottom is provided with flange, and medium body 1 is enclosed within the outer and bottom surface of conductive layer 3 and can just be placed on the flange.This harmonic oscillator is simple in structure, need not to adopt platings to wait complicated technology to form conductive layer 3, thereby thereby establishing the hole can be convenient to connector such as screw and pass to contact with the resonant cavity bottom and be connected ground connection at the center of conductive layer 3 base flange, fixing harmonic oscillator also simultaneously.Certainly, metal cylinder might not have flange, can only have columnar structured, fixing by bonding or other modes and resonant cavity bottom.The conductive layer of preferred harmonic oscillator directly is connected and ground connection with the resonant cavity bottom electrical.The metal cylinder here wants independently to become the parts of certain intensity, and preferred wall thickness makes by technologies such as die casting, pull and stretch greater than more than the 0.05mm.
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.
In addition, tuning plug 4 is contained in cavity or the chamber covers, 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.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.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 ends can directly contact with shrinkage pool 2 inwalls or conductive layer 3.When conductive layer 3 does not contact with tuning plug 4 but between inside cavity, tuning plug 4 outer surfaces, form capacity effect with the two respectively, thereby strengthen the tuning effect of frequency reducing.
The side of preferred shrinkage pool 2 and bottom surface parallel with side and the bottom surface that tuning plug 4 stretches into the part of shrinkage pool 2 respectively, and the effective area that makes 4 pairs of shrinkage pools 2 of tuning plug exert an influence increases, and improves tuning range.In addition, 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, 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.Tuning plug 4 inserts in the shrinkage pool 2 and can also increase electric capacity and inductance value, and the resonance frequency of first pattern is regulated among a small circle.
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 resonant cavity cavity is square column type, this ceramic dielectric harmonic oscillator adopts the cylindrical microwave media ceramic, be of a size of external diameter 24mm, internal diameter 8mm, high 19mm, internal diameter corresponds to through hole, the resonance frequency that experiment records the resonant cavity with this dielectric resonance is 1.642GHz, and the average power of this resonant cavity is 275W.
Adopt identical cavity and dielectric resonance (above-mentioned pure ceramic dielectric harmonic oscillator is as the medium body of harmonic oscillator in this example), and plate 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, and average power is 335W.
This shows, adopt harmonic oscillator of the present utility model, with respect to simple dielectric resonance, resonance frequency can be reduced about 800MHz, be essentially half of original resonance frequency, corresponding meaning is when the resonant cavity of preparation identical resonance frequency, cavity volume will reduce significantly, and little to the influence of power.
And adopt identical cavity, and dielectric resonance is replaced by shape, metal harmonic oscillator that volume is identical, the resonance frequency that experiment records the resonant cavity with this metal harmonic oscillator is 1.569GHz, average power is 54W.
This shows, adopt harmonic oscillator of the present utility model, the metal harmonic oscillator with respect to simple still can provide close substantially resonance frequency, and average power has then improved greatly.
In sum, adopt harmonic oscillator of the present utility model as can be known, the anti-high-power advantage that namely has dielectric resonance, the advantage that the resonance frequency that has the metal harmonic oscillator simultaneously concurrently is low, volume is little can be widened the resonant cavity of prior art, the range of application of filtering device greatly.
Based on the characteristics of the resonant cavity in above-mentioned single chamber, the utility model also relates to a kind of filtering device, can have the device of filter function for filter, duplexer or other, and it comprises at least one resonant cavity, and wherein at least one resonant cavity is above-mentioned resonant cavity.
Be example with Fig. 7 or multicavity filter shown in Figure 8, filter shown in Figure 5 is the filter with six resonant cavitys.Port (input 8 and output 9) is equipped with at cavity 5 two ends respectively, and as shown in Figure 7, port forms electric coupling by Metallic rod 10 and harmonic oscillator; As shown in Figure 8, port forms electric coupling by sheet metal 11 and harmonic oscillator.
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 such as Fig. 7 or shown in Figure 8ly link into an integrated entity by bridging part 7 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.
By Fig. 7 or Fig. 8 as can be known, each harmonic oscillator is as indicated above, have shrinkage pool 2 and be attached to conductive layer 3 on shrinkage pool 2 inwalls, and each shrinkage pool 2 correspondence is provided with a tuning plug 4 and inserts in the 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 9, 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 (25)
1. resonant cavity, comprise the port at cavity, cavity two ends and be positioned at the harmonic oscillator of cavity, it is characterized in that described harmonic oscillator comprises the medium body, is opened in the 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 port is contained on the described cavity and stretches in the cavity, and the end of described port is free end.
2. resonant cavity according to claim 1 is characterized in that, the free end of described port also connects a Metallic rod or a sheet metal.
3. resonant cavity according to claim 2 is characterized in that, described port is by described Metallic rod or described sheet metal and described harmonic oscillator formation electric coupling.
4. resonant cavity according to claim 1 is characterized in that, described conductive layer is attached directly on the described shrinkage pool inwall.
5. resonant cavity according to claim 1 is characterized in that, described conductive layer is by connecting side or the chamber, bottom surface that media is fixed on described shrinkage pool inwall.
6. resonant cavity according to claim 1 is characterized in that, described medium body is made greater than 1 material by dielectric constant.
7. resonant cavity according to claim 1 is characterized in that, described medium body is made by ceramic material.
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 is metal cylinder, and described medium body is tubular and is set in outside the described metal cylinder.
10. 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.
11. resonant cavity according to claim 1 is characterized in that, the electric conducting material of described conductive layer is metal.
12. resonant cavity according to claim 11 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.
13. resonant cavity according to claim 1 is characterized in that, the electric conducting material of described conductive layer is nonmetal for conduction.
14. resonant cavity according to claim 13 is characterized in that, described electric conducting material is electrically conductive graphite, indium tin oxide or Al-Doped ZnO.
15. resonant cavity according to claim 1 is characterized in that, described resonant cavity comprises also and is contained on the described cavity and stretches into and play tuning used tuning plug in the described cavity that the shrinkage pool on described tuning plug and the described medium body arranges in opposite directions.
16. resonant cavity according to claim 15 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.
17. resonant cavity according to claim 15 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.
18. resonant cavity according to claim 1 is characterized in that, described shrinkage pool is through hole, and is attached with the conductor articulamentum on the medium body surface that described through hole is connected.
19. resonant cavity according to claim 18 is characterized in that, the inwall of described conductor articulamentum and described resonant cavity is connected to one by welding or hot pressing or threaded engagement or bonding mode.
20. a filtering device comprises one or more resonant cavitys, it is characterized in that, at least one described resonant cavity is the described resonant cavity of claim 1 ~ 19.
21. filtering device according to claim 20 is characterized in that, described filtering device is filter or duplexer.
22. filtering device according to claim 21 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.
23. filtering device according to claim 21 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.
24. an electromagnetic wave equipment comprises 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 the described filtering device of claim 20 to 23.
25. electromagnetic wave equipment according to claim 24 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 201320002530 CN203119076U (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 |
|---|---|---|---|
| CN201220616775 | 2012-11-20 | ||
| CN201220616775.8 | 2012-11-20 | ||
| CN 201320002530 CN203119076U (en) | 2012-11-20 | 2013-01-04 | Resonant cavity, filtering device and electromagnetic wave equipment |
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| Publication Number | Publication Date |
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| CN203119076U true CN203119076U (en) | 2013-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320002530 Expired - Fee Related CN203119076U (en) | 2012-11-20 | 2013-01-04 | Resonant cavity, filtering device and electromagnetic wave equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108294760A (en) * | 2017-12-04 | 2018-07-20 | 哈尔滨吉赫科技有限责任公司 | A kind of noninvasive microwave blood sugar test set |
-
2013
- 2013-01-04 CN CN 201320002530 patent/CN203119076U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108294760A (en) * | 2017-12-04 | 2018-07-20 | 哈尔滨吉赫科技有限责任公司 | A kind of noninvasive microwave blood sugar test set |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130807 Termination date: 20210104 |
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| CF01 | Termination of patent right due to non-payment of annual fee |