CN108649311B - Manufacturing method of cavity coupler - Google Patents
Manufacturing method of cavity coupler Download PDFInfo
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- CN108649311B CN108649311B CN201810886508.4A CN201810886508A CN108649311B CN 108649311 B CN108649311 B CN 108649311B CN 201810886508 A CN201810886508 A CN 201810886508A CN 108649311 B CN108649311 B CN 108649311B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
Abstract
The embodiment of the invention relates to a manufacturing method of a cavity coupler. The method comprises the following steps: splitting a cavity coupler to be processed to obtain an initial upper cavity, an initial lower cavity and an initial middle partition plate, processing the planeness of the initial upper cavity, the initial lower cavity and the initial middle partition plate respectively to obtain the upper cavity, the lower cavity and the middle partition plate, clamping the upper cavity, the lower cavity and the middle partition plate to obtain a clamping cavity coupler, and measuring the obtained clamping cavity coupler to obtain the cavity coupler. By the technical scheme provided by the embodiment, on one hand, the technical defects that in the prior art, the welding times are too many, the production efficiency is reduced are avoided, and the technical effect of improving the production efficiency is realized; on the other hand, the influence of an operator on production is avoided, and the technical effects of production stability and reliability are improved; on the other hand, the technical effects of improving the production precision and the yield are achieved.
Description
Technical Field
The embodiment of the invention relates to the technical field of coupler process manufacturing, in particular to a manufacturing method of a cavity coupler.
Background
The cavity coupler has the functions of distributing and outputting power according to the designed proportion and direction, has a complex general structure and numerous internal steps and spacers, and needs to be processed in multiple sections and then welded into a whole piece through multiple times of brazing during manufacturing. The manufacturing difficulty is high, the production period is long, and the yield and the production efficiency are low. How to improve the yield and the production efficiency is a technical problem to be solved urgently.
In the prior art, the cavity coupler is designed into a double-path waveguide structure consisting of a plurality of discrete parts, the stepped cavity in the waveguide is numerous, the parts are welded together through aluminum brazing, and the requirements on the waveguide airtightness and the space size of three waveguide ports are strict in the using process.
The technical difficulties in production mainly include:
1. a plurality of parts in the cavity coupler need to be subjected to vacuum aluminum brazing firstly, then manual flame welding is carried out for a plurality of times in a segmented mode, the number of welding seams is more than 30, and accumulated deformation after welding is large. When manual flame brazing is carried out in a segmented mode, secondary melting of the vacuum brazing filler metal in the early stage is easily caused, air leakage is caused, leakage stoppage can be carried out only through repeated repair welding after welding, and the product quality is poor. And based on current structure, can't direct heating and observation to a plurality of step department welds that electric index influence is great during manual flame welding, the melting of brazing filler metal and the brazing filler metal pile up the condition and be difficult to observe. Meanwhile, the length of the welding seam of the two bent waveguides reaches 225mm, the stress concentration of the tail end after welding is serious, and the tail end of the bent waveguide is easy to open and weld during later assembly.
2. The space size between the two waveguide ports is ensured only by the end cavity connected with the two waveguide ports, the two bent waveguides are suspended by more than 200mm, the deformation after welding is large, the central space distance 25.050.1 and the space angle 75 +/-10' of the two waveguide ports required by the drawing are extremely difficult to ensure, the shape can be corrected only through welding, but the welding seam is easy to crack in the shape correcting process.
3. The step piece cavity is a key part which influences the insertion loss of the receiving and transmitting feed source, the thickness of the step piece is only 1mm, after processing and welding, the step piece is seriously deformed, and the symmetry degree is hardly guaranteed to be +/-0.05 mm.
4. The cavity part deep and narrow cavity and step cavity in the cavity coupler are structurally characterized by external cooperation electric spark machining at present, the machining efficiency is low, the cost is high, the part machining period is long, and the model batch production progress is restricted.
Disclosure of Invention
In order to solve at least one technical problem in the foregoing background, an embodiment of the present invention provides a method for manufacturing a cavity coupler, where the method includes:
splitting the cavity coupler to be processed to obtain an initial upper cavity, an initial lower cavity and an initial middle partition plate;
respectively processing the planeness of the initial upper cavity, the initial lower cavity and the initial middle partition plate to obtain an upper cavity, a lower cavity and a middle partition plate;
clamping the upper cavity, the lower cavity and the middle partition plate to obtain a clamping cavity coupler;
and measuring the clamping cavity coupler to obtain the cavity coupler.
The embodiment provides that: after a cavity coupler to be processed is split to obtain an initial upper cavity, an initial lower cavity and an initial middle partition plate, the planeness of the initial upper cavity, the initial lower cavity and the initial middle partition plate is processed respectively to obtain the upper cavity, the lower cavity and the middle partition plate, a clamping cavity coupler is obtained after the upper cavity, the lower cavity and the middle partition plate are clamped, and the obtained clamping cavity coupler is measured to obtain the cavity coupler; on the other hand, the influence of an operator on production is avoided, and the technical effects of production stability and reliability are improved; on the other hand, the technical effects of improving the production precision and the yield are achieved.
Preferably, the processing the flatness of the initial upper cavity and the initial lower cavity specifically includes:
and respectively and sequentially carrying out square milling treatment, primary inner cavity milling treatment, heat treatment, inner cavity re-milling treatment, deburring treatment and back chipping treatment on the initial upper cavity and the initial lower cavity.
The embodiment provides that: the technical scheme that the initial upper cavity and the initial lower cavity are subjected to square milling treatment, primary inner cavity milling treatment, heat treatment, inner cavity milling treatment again, deburring treatment and back chipping treatment in sequence is adopted, the technical effects of complete annealing stress removal and residual stress influence elimination are achieved, and therefore the technical effect of flatness accuracy of the initial upper cavity and the initial lower cavity after flatness treatment is guaranteed.
Preferably, the processing of the flatness of the initial intermediate barrier specifically includes:
and sequentially carrying out assembling treatment, heat leveling treatment, milling treatment and deburring treatment on the initial intermediate partition plate.
The embodiment provides that: the technical scheme of assembling, heat leveling, milling and deburring the initial intermediate partition plate achieves the technical effect of ensuring the high-precision flatness of the processed initial intermediate partition plate.
Preferably, the assembling process of the initial intermediate partition plate specifically includes:
coating lubricating oil on the tooling plate;
and pushing the initial middle partition plate into the tool plate, so that the initial middle partition plate is clamped between the fixed baffle of the tool plate and the movable stop block of the tool plate.
The embodiment provides that: the middle partition plate is pushed into the tooling plate coated with lubricating oil, so that the middle partition plate is clamped between the fixed baffle and the movable stop block, the technical effect of clamping the middle partition plate is achieved, the cost is low, the technical defect that deformation is easily generated in the clamping process in the prior art is overcome, and the technical effect of ensuring the flatness of the middle partition plate is achieved.
Preferably, during the milling process, a disc mill with inserts having a principal rake angle of 45 ° is used.
The embodiment provides that: by adopting the technical scheme of the disc milling cutter with the main deflection angle of the blade of 45 degrees, a component force is always provided to press the intermediate partition plate on the tooling plate in the milling process, the vibration in the milling process is reduced, and the flatness and the roughness of the milled intermediate partition plate are ensured.
Preferably, the clamping treatment of the upper cavity, the lower cavity and the middle partition plate specifically includes:
setting a first SiC plate as a lower bottom plate;
setting a second SiC plate as an upper laminate flat plate;
the lower cavity, the middle partition plate and the upper cavity are sequentially arranged between the lower bottom plate and the upper laminating flat plate, and brazing filler metal is placed between the lower cavity and the middle partition plate and between the middle partition plate and the upper cavity;
the lower bottom plate is attached to the lower cavity, and the upper laminating flat plate is attached to the upper cavity.
The embodiment provides that: the technical scheme that the lower cavity, the middle partition plate and the upper cavity are sequentially arranged between the lower bottom plate and the upper laminating flat plate, and brazing filler metal is respectively arranged between the lower cavity and the middle partition plate and between the middle partition plate and the upper cavity, so that the compression strength is ensured, the higher flatness and the heat conduction coefficient are ensured, and the technical effect of the lower linear expansion coefficient is also ensured.
Preferably, the method further comprises:
and a cast iron pressure plate is attached to the upper laminating flat plate.
The embodiment provides that: the technical scheme that the cast iron pressing plate is arranged on the upper laminating flat plate further ensures the pressing force.
Preferably, the measuring the clamping cavity coupler to obtain the cavity coupler specifically includes:
measuring a gap between the lower bottom plate and the lower cavity to obtain a measurement result;
and comparing the measurement result with a preset measurement threshold, and if the measurement result is smaller than the measurement threshold, determining the clamping cavity coupler as the cavity coupler.
The embodiment provides that: the technical scheme that the measuring result is compared with the measuring threshold value, and the clamping cavity coupler with the measuring result smaller than the measuring threshold value is determined to be the cavity coupler ensures the accuracy, stability and reliability of the obtained cavity coupler.
Wherein the measurement threshold is 0.05 mm.
Preferably, the method further comprises:
and carrying out vacuum brazing treatment on the cavity coupler to obtain the target cavity coupler.
The embodiment provides that: the technical scheme of the target cavity coupler is obtained by carrying out vacuum brazing treatment on the cavity coupler, and the technical effects of good melting and flowing of the solder and excellent quality of a welding seam are achieved.
Drawings
Fig. 1 is a schematic flow chart illustrating a method for manufacturing a cavity coupler according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, interfaces, techniques, etc. in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
The embodiment of the invention provides a manufacturing method of a cavity coupler.
The first embodiment:
referring to fig. 1, fig. 1 is a schematic flow chart illustrating a method for manufacturing a cavity coupler according to an embodiment of the invention.
As shown in fig. 1, the method includes:
s100: and splitting the cavity coupler to be processed to obtain an initial upper cavity, an initial lower cavity and an initial middle partition plate.
The three-dimensional model of each discrete part can be constructed by using ProE on the basis of a two-dimensional drawing. Namely, the cavity coupler to be processed is split through the proE, and discrete parts (an initial upper cavity, an initial lower cavity and an initial middle partition plate) are obtained.
S200: and respectively processing the planeness of the initial upper cavity, the initial lower cavity and the initial middle partition plate to obtain the upper cavity, the lower cavity and the middle partition plate.
And respectively processing the planeness of the initial upper cavity, the initial lower cavity and the initial middle partition plate so as to ensure the accurate planeness of the upper cavity, the lower cavity and the middle partition plate obtained after the processing.
S300: clamping the upper cavity, the lower cavity and the middle partition plate to obtain a clamping cavity coupler;
s400: and measuring the clamping cavity coupler to obtain the cavity coupler.
The aluminum alloy blank in the annealing state (O) is adopted to replace the aluminum alloy blank in the F state and is used as a component material of the cavity coupler to be processed.
The embodiment provides that: after a cavity coupler to be processed is split to obtain an initial upper cavity, an initial lower cavity and an initial middle partition plate, the planeness of the initial upper cavity, the initial lower cavity and the initial middle partition plate is processed respectively to obtain the upper cavity, the lower cavity and the middle partition plate, a clamping cavity coupler is obtained after the upper cavity, the lower cavity and the middle partition plate are clamped, and the obtained clamping cavity coupler is measured to obtain the cavity coupler; on the other hand, the influence of an operator on production is avoided, and the technical effects of production stability and reliability are improved; on the other hand, the technical effects of improving the production precision and the yield are achieved.
Second embodiment:
the present embodiment is based on the first embodiment. In this embodiment, S200 specifically includes:
and respectively carrying out square milling treatment, primary inner cavity milling treatment, heat treatment, inner cavity re-milling treatment, deburring treatment and back chipping treatment on the initial upper cavity and the initial lower cavity in sequence.
In order to ensure the flatness of the upper cavity and the lower cavity, the allowance of 1mm is reserved in one-time inner cavity milling treatment, and then a heat treatment process is carried out, so that the stress is removed by complete annealing, and the influence of residual stress is eliminated as much as possible. And carrying out inner cavity re-milling treatment after the heat treatment so as to reduce the residual stress after the inner cavity re-milling treatment as much as possible.
The embodiment provides that: the technical scheme that the initial upper cavity and the initial lower cavity are subjected to square milling treatment, primary inner cavity milling treatment, heat treatment, inner cavity milling treatment again, deburring treatment and back chipping treatment in sequence is adopted, the technical effects of complete annealing stress removal and residual stress influence elimination are achieved, and therefore the technical effect of flatness accuracy of the initial upper cavity and the initial lower cavity after flatness treatment is guaranteed.
The third embodiment:
the present embodiment is based on the first or second embodiment. In this embodiment, S200 further specifically includes:
and sequentially carrying out assembling treatment, heat leveling treatment, milling treatment and deburring treatment on the initial intermediate partition plate.
Wherein the initial intermediate partition is a thin sheet of 400200 (mm).
The embodiment provides that: the technical scheme of assembling, heat leveling, milling and deburring the initial intermediate partition plate achieves the technical effect of ensuring the high-precision flatness of the processed initial intermediate partition plate.
The fourth embodiment:
the present embodiment is based on the third embodiment. In this embodiment, the assembling process of the initial intermediate partition plate specifically includes:
coating lubricating oil on the tooling plate;
and pushing the initial intermediate partition plate into the tooling plate, so that the initial intermediate partition plate is clamped between the fixed baffle of the tooling plate and the movable stop block of the tooling plate.
In the prior art, the initial intermediate partition plate can be assembled in a vacuum chuck clamping mode.
Of course, the initial intermediate partition plate can be pressed on a certain fixing plate by screws through milling counter bores on the periphery of the initial intermediate partition plate. By adopting the mode, the clamping device is simple, and has the advantage of low cost compared with a vacuum chuck clamping mode.
However, due to the limited number and location of the counterbores on the initial intermediate diaphragm, the sheet is less likely to be compacted in areas further from the counterbores. And the compression screw limits the deformation of the initial middle partition plate caused by cutting force, so that the area which is not compressed by the screw generates arching deformation, and even generates a micro step.
In this embodiment, utilize the negative pressure principle, process out a plurality of blind holes that are used for the oil storage on the frock board, the one end of frock board sets up fixed stop, and fixed stop's thickness is 4.5mm, and the other end of frock board sets up movable stop.
When the initial intermediate partition plate is assembled and processed, the screw is pressed down, the movable stop block can be guaranteed to be tightly attached to the tooling plate and extruded to the initial intermediate partition plate, and the initial intermediate partition plate is guaranteed to be attached to the tooling plate during pressing.
During assembly, one surface of the initial intermediate partition plate is milled flat, after a proper amount of lubricating oil is coated on the tool plate, the oil quantity is required to be over an oil storage hole (namely a blind hole), the initial intermediate partition plate is pushed into the tool plate from one side, and the compression screw is screwed so that the initial intermediate partition plate is clamped between the fixed baffle of the tool plate and the movable stop block of the tool plate.
The embodiment provides that: the middle partition plate is pushed into the tooling plate coated with lubricating oil, so that the middle partition plate is clamped between the fixed baffle and the movable stop block, the technical effect of clamping the middle partition plate is achieved, the cost is low, the technical defect that deformation is easily generated in the clamping process in the prior art is overcome, and the technical effect of ensuring the flatness of the middle partition plate is achieved.
Fifth embodiment:
the present embodiment is based on the third or fourth embodiment. In this embodiment, a disc cutter having an insert with a principal rake angle of 45 ° is used in the milling process.
In order to ensure that the initial intermediate partition plate is always compacted on the tool plate in the milling process, the direction of cutting force in the milling process needs to be planned, and in order to always obtain a component force pressing against the tool plate in the whole milling process, a 45-disc milling cutter with a main deflection angle of a blade is selected. In the milling process, a component force can be always provided to tightly press the initial intermediate partition plate on the tooling plate, bubbles between the initial intermediate partition plate and the tooling plate are extruded to form negative pressure, so that the initial intermediate partition plate is tightly attached to the tooling plate, the vibration in the milling process is reduced, and the flatness and the surface roughness of the milled initial intermediate partition plate are ensured.
The embodiment provides that: by adopting the technical scheme of the disc milling cutter with the main deflection angle of the blade of 45 degrees, a component force is always provided to press the intermediate partition plate on the tooling plate in the milling process, the vibration in the milling process is reduced, and the flatness and the roughness of the milled intermediate partition plate are ensured.
Sixth embodiment:
the present embodiment is based on any one of the first to fifth embodiments. In this embodiment, S300 specifically includes:
setting a first SiC plate as a lower bottom plate;
setting a second SiC plate as an upper laminate flat plate;
a lower cavity, a middle partition plate and an upper cavity are sequentially arranged between the lower bottom plate and the upper laminating flat plate, and brazing filler metal is arranged between the lower cavity and the middle partition plate and between the middle partition plate and the upper cavity;
wherein, the lower bottom plate is jointed with the lower cavity, and the upper laminating flat plate is jointed with the upper cavity.
When enough compression force is ensured, a proper upper laminating flat plate needs to be selected, so that high flatness and heat conduction coefficient are ensured, low linear expansion coefficient is required, and the aluminum material is stable in chemical property and cannot react with the aluminum material. After layer-by-layer screening, SiC plates are selected as a lower bottom plate and an upper laminated flat plate, the heat conduction coefficient of the adopted SiC plates reaches 120W/(m.K) which is four times that of an alumina ceramic plate, and meanwhile, the linear expansion coefficient is only 310-6/K, which is shown in Table 1.
TABLE 1 comparison of SiC plate to alumina plate Performance
The specific clamping mode is as follows:
the bottom layer is provided with a whole SiC bottom plate (lower bottom plate), the lower cavity body, brazing filler metal, the middle partition plate, the brazing filler metal and the upper cavity body are assembled and then arranged on the bottom plate, and then a whole SiC plate (upper flat pressing plate) with the same specification is arranged.
The embodiment provides that: the technical scheme that the lower cavity, the middle partition plate and the upper cavity are sequentially arranged between the lower bottom plate and the upper laminating flat plate, and brazing filler metal is respectively arranged between the lower cavity and the middle partition plate and between the middle partition plate and the upper cavity, so that the compression strength is ensured, the higher flatness and the heat conduction coefficient are ensured, and the technical effect of the lower linear expansion coefficient is also ensured.
Seventh embodiment:
this embodiment is based on any one of the sixth embodiments. In this embodiment, the method further includes:
and a cast iron pressure plate is attached to the upper laminating flat plate.
I.e. a 20mm cast iron whole press plate is pressed onto the SiC plate (upper laminate plate).
The embodiment provides that: the technical scheme that the cast iron pressing plate is arranged on the upper laminating flat plate further ensures the pressing force.
Eighth embodiment:
the present embodiment is based on the sixth or seventh embodiment. In this embodiment, measuring the clamping cavity coupler to obtain the cavity coupler specifically includes:
measuring the gap between the lower bottom plate and the lower cavity to obtain a measurement result;
and comparing the measurement result with a preset measurement threshold, and determining the clamping cavity coupler as the cavity coupler if the measurement result is smaller than the measurement threshold.
Wherein the measurement threshold is 0.05 mm.
Specifically, the clearance size is measured by using a feeler, and the feeler with the diameter of 0.05mm cannot be inserted into the clearance size, so that the clearance size meets the requirement, namely the feeler is determined to be a cavity coupler.
Ninth embodiment:
the present embodiment is based on any one of the first to eighth embodiments. In this embodiment, the method further includes:
and carrying out vacuum brazing treatment on the cavity coupler to obtain the target cavity coupler.
After the cavity coupler is subjected to vacuum brazing treatment, the melting flow of the solder is found to be good, and the quality of a welding seam is excellent. In order to monitor the actual temperature rise condition in the vacuum brazing process more accurately, the positions of three thermocouples arranged in the cavity coupler in the aluminum vacuum furnace are optimized. Two thermocouples located at the rear part in the vacuum furnace are placed on the edge of the upper surface of the upper cavity body and used for monitoring the temperature around the outer side of the cavity body coupler. A thermocouple in the middle of the vacuum furnace is inserted into the cavity coupler through a vent hole between the upper cavity and the middle partition plate, and the temperature in the middle of the interior of the cavity coupler is detected. By optimizing the placement position of the thermocouple, the real-time temperature of the cavity coupler in the vacuum brazing process can be accurately monitored. The monitored results show that: the problem of uneven temperature rise after large-area solid areas of the upper cavity and the lower cavity are removed by large margin is greatly improved.
The reader should understand that in the description of this specification, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
It should also be understood that, in the embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A method of making a cavity coupler, the method comprising:
splitting the cavity coupler to be processed to obtain an initial upper cavity, an initial lower cavity and an initial middle partition plate;
respectively processing the planeness of the initial upper cavity, the initial lower cavity and the initial middle partition plate to obtain an upper cavity, a lower cavity and a middle partition plate;
clamping the upper cavity, the lower cavity and the middle partition plate to obtain a clamping cavity coupler;
setting a first SiC plate as a lower bottom plate;
setting a second SiC plate as an upper laminate flat plate;
the lower cavity, the middle partition plate and the upper cavity are sequentially arranged between the lower bottom plate and the upper laminating flat plate, and brazing filler metal is placed between the lower cavity and the middle partition plate and between the middle partition plate and the upper cavity;
the lower bottom plate is attached to the lower cavity, and the upper laminating flat plate is attached to the upper cavity;
and measuring the clamping cavity coupler to obtain the cavity coupler.
2. The method for manufacturing a cavity coupler according to claim 1, wherein the processing of the flatness of the initial upper cavity and the initial lower cavity specifically comprises:
and respectively and sequentially carrying out square milling treatment, primary inner cavity milling treatment, heat treatment, inner cavity re-milling treatment, deburring treatment and back chipping treatment on the initial upper cavity and the initial lower cavity.
3. The method for manufacturing a cavity coupler according to claim 1, wherein the processing of the flatness of the initial intermediate barrier specifically comprises:
and sequentially carrying out assembling treatment, heat leveling treatment, milling treatment and deburring treatment on the initial intermediate partition plate.
4. The method for manufacturing a cavity coupler according to claim 3, wherein the assembling process of the initial intermediate partition plate specifically includes:
coating lubricating oil on the tooling plate;
and pushing the initial middle partition plate into the tool plate, so that the initial middle partition plate is clamped between the fixed baffle of the tool plate and the movable stop block of the tool plate.
5. The method of claim 3, wherein the first and second cavities are different from each other,
in the milling process, a disc milling cutter with a main deflection angle of the blade of 45 degrees is adopted.
6. The method of claim 1, further comprising:
and a cast iron pressure plate is attached to the upper laminating flat plate.
7. The method according to claim 1, wherein the measuring the clamping cavity coupler to obtain the cavity coupler specifically comprises:
measuring a gap between the lower bottom plate and the lower cavity to obtain a measurement result;
and comparing the measurement result with a preset measurement threshold, and if the measurement result is smaller than the measurement threshold, determining the clamping cavity coupler as the cavity coupler.
8. The method of claim 7, wherein the step of forming the cavity coupler comprises,
the measurement threshold is 0.05 mm.
9. The method of fabricating a cavity coupler according to any one of claims 1-5 and 6-8, wherein the method further comprises:
and carrying out vacuum brazing treatment on the cavity coupler to obtain the target cavity coupler.
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| US7168152B1 (en) * | 2004-10-18 | 2007-01-30 | Lockheed Martin Corporation | Method for making an integrated active antenna element |
| CN201011955Y (en) * | 2007-02-07 | 2008-01-30 | 孙岳铮 | Rotary book shelf |
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| CN205900761U (en) * | 2016-08-18 | 2017-01-18 | 上海肯汀通讯科技有限公司 | Coupler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9627740B2 (en) * | 2015-01-29 | 2017-04-18 | Alcatel-Lucent Shanghai Bell Co., Ltd | RF notch filters and related methods |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7168152B1 (en) * | 2004-10-18 | 2007-01-30 | Lockheed Martin Corporation | Method for making an integrated active antenna element |
| CN201011955Y (en) * | 2007-02-07 | 2008-01-30 | 孙岳铮 | Rotary book shelf |
| CN101234467A (en) * | 2008-03-04 | 2008-08-06 | 常州市鼎亨机电设备有限公司 | QS-4 elastic body processing technique for sensor |
| CN104347923A (en) * | 2014-11-22 | 2015-02-11 | 成都锦江电子系统工程有限公司 | Y-shaped power divider manufacturing technology |
| CN205900761U (en) * | 2016-08-18 | 2017-01-18 | 上海肯汀通讯科技有限公司 | Coupler |
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