CN102509839A - Microwave device and manufacturing method therefor - Google Patents
Microwave device and manufacturing method therefor Download PDFInfo
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- CN102509839A CN102509839A CN201110363835XA CN201110363835A CN102509839A CN 102509839 A CN102509839 A CN 102509839A CN 201110363835X A CN201110363835X A CN 201110363835XA CN 201110363835 A CN201110363835 A CN 201110363835A CN 102509839 A CN102509839 A CN 102509839A
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Abstract
The invention discloses a microwave device and a manufacturing method therefor. The inner surface of a notch of the aluminum cavity of the microwave device is provided with a metallic coating; the metallic coating is an alloy of one or more than one of gold, silver, copper, tin and zinc; the content of ferromagnetism metals in the metallic coating is equal to or less than 3 percent; a contact between the inner surface of the notch and the outer surface of the projection of a coaxial connector does not contain insulators or ferromagnetism metals; and the contact pressure of the contact is 1 to 500 N. The microwave device provided by the embodiment of the invention solves the bottleneck problem of the indoor coverage of a 3G mobile communication system, that is, the passive intermodulation index of a passive device is improved by 3dB at least, and the passive intermodulation index is stably kept in a long term.
Description
Technical field
The present invention relates to wireless communication technology, particularly a kind of microwave device and manufacturing approach thereof.
Background technology
Along with GSMs such as telecommunications industry 3G (third generation), LTE put into effect, the wireless high-speed downloading service moves towards huge numbers of families gradually.In wireless communication system, along with the voice-and-data information that need pass through in the fixed-bandwidth increases day by day, passive intermodulation becomes a key factor of restriction system capacity.As the same in active device, two or more frequencies mix in nonlinear device and have just produced spurious signal---passive intermodulation.In spuious inter-modulated signal dropped on the frequency acceptance band of base station, the sensitivity of receiver will reduce, thereby caused the reduction of speech quality or system carrier interference ratio (C/I) and capability of communication system to reduce.
The reason that passive intermodulation produces is a lot, comprising: the magnetic conductor that Mechanical Contact is bad, comprise in the radio-frequency channel and the pollution of radio frequency conducting surface etc.Specific to every kind of device even each device, the weight allocation of a variety of causes is all inequality, so the improvement of microwave device passive intermodulation performance mainly relies on actual measurement that feedback information is provided.
Though estimate that accurately the passive intermodulation level ratio of device is difficult, we can come characterizing device with data measured.Because the performance of passive intermodulation can change along with structural minor alteration, so manufacturer should carry out 100% inspection to the radio-frequency devices that is applied in the base station, maintains acceptability limit all the time with the passive intermodulation of guaranteeing device.The passive intermodulation index is lower than-and the accurate measurement of 120dBc43dBm mainly relies on import intermodulation appearance, every price units up to a million, the tens thousand of units of annual calibration expense.In the measuring process, need operating personnel to be proficient in the principle that passive intermodulation produces, and have abundant practical operation experience.This makes that said accurate measurement is difficult to realize.Homemade intermodulation appearance price only needs four, 500,000 yuan, but is lower than-index measurement of 120dBc43dBm for passive intermodulation, and accuracy is not enough sometimes.Build the measuring system of IEC regulation if adopt frequency spectrograph and signal generator, filter etc.; Not only two high-power noiselike signal sources are difficult to obtain; Required microwave device, cable, joint itself all need reach higher passive intermodulation index, and their calibration measurement also is insoluble problem.
Summary of the invention
Inventor of the present invention finds to have problems in the above-mentioned prior art, and has therefore proposed a kind of new technical scheme at least one problem in the said problem.
An object of the present invention is to provide a kind of microwave device with low passive intermodulation.
According to a first aspect of the invention, a kind of microwave device is provided, has comprised aluminum cavity and coaxial connector, the sidewall of aluminum cavity is formed with breach, and coaxial connector has the convexity with the breach of aluminum cavity coupling; Wherein, the inner surface of breach contacts with protruding outer surface; The inner surface of breach has the coat of metal, and the coat of metal is one or several the alloy in gold, silver, copper, tin, the zinc; Ferromagnetic metal content is no more than 3% in the coat of metal; Contact between the outer surface of the inner surface of breach and convexity does not comprise insulant or ferromagnetic metal; The contact pressure of contact is in 1～500 newton.
Preferably, the inner surface of aluminum cavity has the coat of metal.
Preferably, fix along screwed between the outer surface of the inner surface of breach and convexity; The inner surface of aluminum cavity has the coat of metal.
Preferably, the al-made chamber bodily form becomes airtight cavity.
Preferably, the aluminum cavity comprises aluminum cavity box, aluminum cavity cover plate, fixes through screw between aluminum cavity box and the cavity cover plate; Aluminum cavity box internal fixation has circuit module; Coaxial connector and aluminum cavity are fixed through screw; Seam between aluminum cavity box and the cavity cover plate is through the encapsulation process of encapsulation process material.
Preferably, the inner surface of the breach of aluminum cavity is formed with pad.
Preferably, the encapsulation process material is waterproof coating or common glue.
Preferably, the aluminum cavity comprises the aluminum cavity of no cover plate, in the aluminum cavity circuit is arranged; The aluminum cavity has the inner surface that contacts with coaxial connector, and coaxial connector has the outer surface that contacts with the aluminum cavity, fixes along screwed between the inner surface of aluminum cavity and the outer surface of coaxial connector.
Preferably, the long-term contact pressure of contact is in 4～40 newton.
Preferably, breach is cylindrical breach, and convexity is a cylindrical protrusions.
Preferably, ferromagnetic metal comprises iron, cobalt, nickel.
Preferably, the thickness of the coat of metal is 1-8um, perhaps 1-4um.
Preferably, microwave device is coupler, mixer, electric bridge or cavity power splitter.
Another object of the present invention provides a kind of manufacturing approach with microwave device of low passive intermodulation.
According to another aspect of the present invention; A kind of manufacturing approach of microwave device is provided; Comprise: coaxial connector and aluminum cavity are provided; The aluminum cavity inner wall is electroplate with the coat of metal with the surface that the aluminum cavity contacts with the coaxial connector outer conductor, and the coat of metal is a kind of in gold, silver, copper, tin, the zinc or several kinds alloy wherein, and the ferromagnetic metal content in particulate metal is no more than 3%; Confirm that the contact between aluminum cavity and the coaxial connector outer conductor is not mingled with macroscopic insulant and ferromagnetic metal; The pressure of the long-term contact of contact is controlled at 1～500 newton; Microwave device assembling back is done encapsulation process to the seam between aluminum cavity and aluminum cavity and the coaxial connector with the encapsulation process material.
Preferably, metal layer thickness is 1～8um.
Preferably, ferromagnetic metal comprises iron, cobalt, nickel.
Preferably, the encapsulation process material is waterproof coating or common glue.。
An advantage of the present invention is, microwave device has contact pressure that the coat of metal, contact do not comprise insulant or ferromagnetic metal, contact in 1～500 newton, makes that the passive intermodulation of this microwave device is lower.
With reference to the detailed description of accompanying drawing to exemplary embodiment of the present invention, it is clear that further feature of the present invention and advantage thereof will become through following.
Description of drawings
The accompanying drawing that constitutes the part of specification has been described embodiments of the invention, and is used to explain principle of the present invention together with the description.
With reference to accompanying drawing, according to following detailed, can be expressly understood the present invention more, wherein:
Fig. 1 illustrates the structure chart of an embodiment of microwave device of the present invention;
Fig. 2 A to 2C illustrates the sketch map of another embodiment of microwave device of the present invention; Fig. 2 A illustrates the sketch map of aluminum cavity box, coaxial connector, internal circuit and the screw of microwave device; Fig. 2 B illustrates the sketch map of the aluminum cavity cover plate of microwave device; Fig. 2 C illustrates the end face example sketch map of microwave device;
Contact area local detail sketch map when the cylindrical breach that Fig. 3 A illustrates microwave device does not have electrodeposited coating;
Contact area local detail sketch map when the breach that Fig. 3 B illustrates microwave device of the present invention is formed with the coat of metal;
Fig. 4 A is that the cylindrical breach that microwave device contains pad is not electroplated contact area local detail sketch map;
Fig. 4 B is that the cylindrical breach that microwave device contains pad has been electroplated contact area local detail sketch map;
Fig. 5 A to 5B illustrates the sketch map of another embodiment of microwave device of the present invention; Fig. 5 A illustrates aluminum cavity, internal circuit, the coaxial connector sketch map of cavity two power splitters; Fig. 5 B illustrates the end face example sketch map of cavity two power splitters;
Fig. 6 A is that sketch map is not electroplated on the surface that the aluminum cavity of cavity two power splitters contacts with coaxial connector;
Fig. 6 B is that sketch map has been electroplated on the surface that the aluminum cavity of cavity two power splitters contacts with coaxial connector;
Fig. 7 illustrates the flow chart of an embodiment of manufacturing approach of the microwave device of low passive intermodulation of the present invention.
Embodiment
To describe various exemplary embodiment of the present invention in detail with reference to accompanying drawing now.It should be noted that: only if specify in addition, otherwise the positioned opposite of parts of in these embodiment, setting forth and step, numeral expression formula and numerical value do not limit the scope of the invention.
Simultaneously, should be understood that the size of the various piece shown in the accompanying drawing is not to draw according to the proportionate relationship of reality for the ease of describing.
Below be illustrative to the description only actually of at least one exemplary embodiment, never as any restriction to the present invention and application or use.
Possibly not go through for the known technology of association area those of ordinary skill, method and apparatus, but under suitable situation, said technology, method and apparatus should be regarded as a part of authorizing specification.
In shown here and all examples of discussing, it only is exemplary that any occurrence should be interpreted as, rather than as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: represent similar terms in similar label and the letter accompanying drawing below, therefore,, then in accompanying drawing subsequently, need further not discuss it in case defined in a certain Xiang Zaiyi accompanying drawing.
At the building of doing the indoor distributed system of information source with RRU (Remote Radio Unit), downloading rate is very slow sometimes, this be since at that time very high, the reverse signal of the inverse noise of RRU disturbed.This phenomenon is comparatively obvious in 800MHz frequency range CDMA (code division multiple access) GSM, in 2GHz frequency range cdma system, though the appearance of this phenomenon is few, more confusing.This forces operator to reduce the power output of RRU, has further improved the cost of indoor covering.This has just limited promoting the use of of current telecommunications industry 3G.
The 3G signal adopts QPSK (quaternary PSK) modulation system, and signal peak-to-average ratio is very high, and the instantaneous power of RRU emission can reach more than the 49dBm (80 watts), substantially exceeds the transmitting power of repeater commonly used in the past; For connected microwave device, system; If continue to use the passive device of passive intermodulation index-120dBc43dBm*2; Calculate according to two 43dBm signal inputs, return loss 18dB, the inverse noise that only on this passive device, produces just reaches 43dBm-120dBc-18dB=-95dBm; The passive intermodulation index of individual devices is unstable, checks that what have can only reach-100dBc43dBm*2 after use a period of time; A plurality of passive devices might cause that all the system reverse noise is high in the indoor distributed system, and location, reparation fault be difficulty very.
In mobile communication indoor distribution system; The passive intermodulation index of cable, joint can be accomplished-150dBc43dBm*2 more stablely; But the passive intermodulation index of microwave device such as coupler, power splitter generally can only be accomplished-120dBc43dBm*2; In case be used in the position about input power 43dBm, just become the bottleneck of systematic function, limited the use of high-power wireless transmitter.
The passive intermodulation index is under the high-power multicarrier input signal condition of expression, the index parameter of passive device nonlinear characteristic.Introduce the bad reason of passive intermodulation index below.
According to the electromagnetic field analysis of microwave device, in cavity 1 shown in accompanying drawing 1, except the internal circuit tie point of the inner wire of coaxial fitting and cavity 1, copper joint projection 6 is maximum with the current density of the contact-making surface of the breach 5 of aluminum cavity.Under the high current density effect, there are two big types of reasons to cause that the passive intermodulation index is bad: (1) unilateral conduction effect and electron tunneling effect, (2) micro discharge phenomenon.
Below introduce the formation of the electron tunneling effect of metal oxide unilateral conduction effect and thin film sandwich in the aluminum cavity.
Aluminium only needed for 2 seconds in air, will form 2 microns oxide-film.
The oxide of metallic aluminium and aluminium is harder.The cylindrical protrusions 6 of stretching to said aluminum cavity box 1 of the coaxial connector 2 that has is when the cylindrical breach 5 that is loaded into that said aluminum cavity box 1 sidewall forms, and contact pressure is less than 1 newton, the alumina layer 9 on said cylindrical breach 5 surfaces that are not enough to crush; Even crushing also new alumina layer can occur immediately.So in fact electric current flows into the aluminum cavity from copper joint projection 6 through the contact point that these oxides or other compound 9 of this metal cover.
If air humidity is greater than 85%, the metal surface has water membrane, and moisture film can adsorb SO usually
2, NO
2, CO
2Deng formation electrolyte.Because potential difference is bigger between copper and two kinds of metals of aluminium, if copper and aluminium have electrically contact, and copper is connected through electrolyte with aluminium, electrochemical corrosion then can take place in copper and aluminium, and aluminium at this moment can be than in the independent easier oxide etch of aluminium in air, in the water.
The conductance of the oxide of aluminium is than copper or the low several magnitude of aluminium, and along with corrosion is deepened, the conductivity of aluminum contact can be lost gradually.
Along with the corrosion of contact-making surface top contact point, the electric current that flow through these contact points originally will be concentrated via a small amount of contact point of residue and flow through, and strengthen the current capacity that remains a small amount of contact point.
Also there is alumite on breach 5 surfaces that remain the aluminum cavity of a small amount of contact point, and according to the difference of this oxide thickness, this alumite has electron tunneling effect and certain unilateral conduction effect, on electricity, shows non-linear.When little electric current passes through, non-linear not obvious; When big electric current flows through, can show non-linear; When comprising multicarrier in the big electric current, can form higher passive intermodulation.
In fact all flow through from the alumite of a small amount of contact point so flow through the big electric current of the multicarrier of contact-making surface, thereby produce higher passive intermodulation.
Microwave device is regarded the dual-port device mostly as, coupler for example, and its input port and output port have very high symmetry.When connect the low intermodulation load of coupling at output port, when input port was measured passive intermodulation, measured value was actually passive intermodulation reflected wave and output end face passive intermodulation reflected wave vector superposed of the input end face of coupler.Usually the distance between coupler input end face and the output end face is 12cm.For the 2G frequency range CDMA signal that moves, UNICOM adopts, the reflected wave of output end face and the reflected wave of input end face be 1.5 wavelength of phasic difference mutually, and amplitude roughly can be cancelled out each other, even can not survey this in esse intermodulation; Yet for the 800MHz frequency range CDMA signal that telecommunications adopts, the reflected wave of output end face and the reflected wave of input end face be 0.68 wavelength of phasic difference mutually, and amplitude can not cancelled out each other, and passive intermodulation shows.
Below tell about the formation of micro discharge phenomenon.
Because the corrosion of part contact point; The perhaps minimizing of actual contact point; The resistance that electric current flows through contact-making surface can strengthen, and the original smaller fine discharge phenomenon of contact-making surface also can strengthen, and the discharge noise can increase; Frequency range measuring passive intermodulation can measure higher noise, has worsened the passive intermodulation index.If not strict differentiation, this noise is also made comparisons with the passive intermodulation index.By contrast, when little electric current flow through, this fine discharge phenomenon did not show.
Attempt adopting the copper cavity to replace the aluminum cavity to be connected, as a result the passive intermodulation unstable properties with the copper joint; The cost of copper cavity approximately is 3 times of aluminium, and cost rises; Copper cavity weight is 3 times of aluminum, inconvenient installation; The copper cavity is stolen easily.
Trial improves the power capacity of cavity through the volume that increases microwave device aluminum cavity internal cavities, and passive intermodulation improves undesirable as a result.
Attempt to adopt and the method that anodic oxidation improves surface conductivity to be done in the al-made chamber surface improve passive intermodulation; But the conductivity of this conductivity oxide layer is not so good; And in air, continue oxidation, deterioration conductivity easily, so the passive intermodulation index still is bad.
Attempted the insertion loss that improves coupler through silver-plated; Improve passive intermodulation in passing, the thickness of silver coating is more than 10um, because the thermal coefficient of expansion of silver and aluminium and inequality; Silver is softer; On a temperature extremes, be squeezed, obtain to loosen in another temperature extremes, the long-time running meeting occurs loosening and passive intermodulation raises.
Attempted through the silver-plated passive intermodulation that improves on the aluminium, but note sealing, and caused steam to be invaded, aluminum component continues to be corroded, silver coating even from the aluminum component surfacial spalling, and passive intermodulation raises.
Trial is through the silver-plated passive intermodulation that improves on the aluminium; But do not note contact pressure, the electric current that causes the convexity of coaxial connector to flow out passes the sulfuration silver layer of said cavity contact surface, arrives silver coating again; Propagate via the silver coating surface, influenced the passive intermodulation index.
Trial on aluminium silver-plated before, earlier plating one deck nickel on aluminium is silver-plated again, to improve the adhesive force of silver coating on aluminum component.But nickel is ferromagnetic metal, and is influential to passive intermodulation.
In addition, if the content of iron, cobalt, nickel in the electroplate liquid is not noted, the content that causes iron, cobalt, nickel is more than 3%, and finally the passive intermodulation to plating piece exerts an influence.
Trial has been done encapsulation process to the seam of coupler with epoxy resin, but the contact-making surface that contacts with coaxial connector of aluminum cavity box is not done plating, and the fine and close aluminium oxide of contact-making surface becomes the obstruction of further raising passive intermodulation index.
Trial has been done encapsulation process to the seam of coupler with epoxy resin, but does not do plating, also controls bad to the pressure with coaxial connector contacts for a long time of aluminum cavity box; Cause the electric current of the convexity outflow of said coaxial connector to choose contact point very randomly, pass the alumina layer of said cavity contact surface, arrive aluminium lamination again; Propagate via the aluminium lamination surface; Coupler passive intermodulation integral level is about-120dBc43dB*2, and dispersion is bigger, can not further improve.
For the ease of quick assembling, thereby shorten metal exposed in the airborne time, attempt size with the cylindrical breach of device be provided with excessive, thereby the cylindrical breach of cylindrical projections and device to contact the slit bigger.Even the result causes slightly touching joint, the passive intermodulation index also can change bigger.
Trial has been done encapsulation process to the seam of coupler, but the fixed screw between coaxial connector and the aluminum cavity do not tighten, cause long-term the use after, the crack appears on the encapsulant, finally passive intermodulation is exerted an influence.
To combine accompanying drawing that execution mode of the present invention is described in detail below.
Fig. 1 illustrates the structure chart of an embodiment of microwave device of the present invention.As shown in Figure 1, this microwave device comprises aluminum cavity 1 and coaxial connector 2, and the sidewall of aluminum cavity 1 is formed with breach 5, and coaxial connector has the convexity 6 with breach 5 couplings of aluminum cavity.Breach 5 adapts with protruding 6 shape, and for example, cylindrical breach 5 is corresponding to cylindrical protrusions 6, perhaps, and elliptical cylinder-shape breach 5 corresponding elliptical cylinder-shapes protruding 6.The inner surface 18 of breach 5 contacts with the outer surface 27 of convexity 6; The inner surface 18 of breach has the coat of metal 15, and the coat of metal 15 is a kind of in gold, silver, copper, tin, the zinc, perhaps several kinds alloy wherein; Ferromagnetic metal content is no more than 3% in the coat of metal 15.The thickness of the coat of metal for example is 1-8um.Contact between the outer surface 27 of the inner surface 18 of breach 5 and convexity 6 does not comprise macroscopic insulant or ferromagnetic metal, and the electric current between inner surface 18 and the outer surface 27 passes through the contact; The long-term contact pressure of contact is in 1-500 newton, and perhaps 4-40 newton is in order to part surface oxide or other compounds of this metal of crushing contact.Ferromagnetic metal for example comprises iron, cobalt, nickel.Aluminum cavity 1 for example is fixed together through screw 8 with coaxial connector.
The profile that it may be noted that quantity, position and the aluminum cavity of coaxial connector among Fig. 1 does not constitute the restriction to microwave device flesh and blood of the present invention.This microwave device for example is coupler, mixer or electric bridge.
Fig. 2 A～2C illustrates the sketch map of another embodiment of microwave device of the present invention.Microwave device among this embodiment comprises aluminum cavity box 1, aluminum cavity cover plate 16 and coaxial connector 2.Fig. 2 A illustrates the sketch map of aluminum cavity box 1, coaxial connector 2, internal circuit 26 and the screw 8,17 of microwave device; Fig. 2 B illustrates the sketch map of the aluminum cavity cover plate 16 of microwave device; Fig. 2 C illustrates the end face example sketch map of microwave device.Aluminum cavity box 1 combines through screw 17 with aluminum cavity cover plate 16, forms the aluminum cavity.Coaxial connector 2 is for example fixed through screw 8 and aluminum cavity.By internal circuit 26, for example, internal circuit 26 fixes with aluminum cavity box in aluminum cavity internal fixation.Tighten fixing with screw 17 between the box wall upper edge surfaces 19 that contacts with aluminum cavity cover plate 16 of aluminum cavity box 1, the lower edge that contacts with aluminum cavity box 1 of aluminum cavity cover plate 16 surface 22; Tighten fixing with screw 8 between coaxial connector 2 and aluminum cavity box 1, the aluminum cavity cover plate 16; The surface 18 of the cylindrical breach 5 that aluminum cavity box 1 sidewall forms is used to contact the outer surface 27 of the cylindrical protrusions 6 of stretching to aluminum cavity box 1 of coaxial connector 2; Surface 18 forms alumina layer easily, and oxidized aluminium lamination 9 covers; The aluminum cavity cover plate 16 of microwave device has the inner wall surface 23 of forming cavity with aluminum cavity box; Has seam 24 between aluminum cavity box 1, the aluminum cavity cover plate 16 on the microwave device outer surface; Have seam 25 between coaxial connector 2, the aluminum cavity box 1 on the microwave device outer surface, have seam 26 between coaxial connector 2 and the aluminum cavity cover plate 16 on the microwave device outer surface.
Contact area local detail sketch map when the cylindrical breach that Fig. 3 A illustrates microwave device does not have electrodeposited coating.Shown in Fig. 3 A, form on the inner surface 18 of aluminum cavity box 1 by alumina layer 9, the alumina layer 9 that forms on the outer surface 27 of cylindrical protrusions 6 and surperficial 18 contacts, and forms contact 31, and the contact point 31 of formation is fewer.Contact area local detail sketch map when the breach that Fig. 3 B illustrates microwave device of the present invention is formed with the coat of metal.Shown in Fig. 3 B, form on the inner surface 18 of aluminum cavity box 1 by alumina layer 9, be electroplate with a coat of metal 15 at the outer surface of alumina layer 9, the coat of metal 15 of formation contacts on the outer surface 27 of cylindrical protrusions 6 and the surface 18.
Though it may be noted that to show alumina layer 9 in the above-described embodiments,, also can not comprise alumina layer 9.
The following embodiment that describes coupler of the present invention, electric bridge and mixer with reference to figure 2A-2C respectively.
In the embodiment of a coupler of the present invention; The inner wall surface 20 of the surface 18 of coupler and aluminum cavity box 1 has been electroplated one deck particulate metal coating 15; Ferromagnetic metal iron in particulate metal, cobalt, nickel content are no more than 3%, and particulate metal is a silver, and particulate metal thickness of coating is 1um; Be provided with the coating that comprises nickel between particulate metal coating and the aluminum cavity surface; The surface 19 of device, surface 22 and surface 23 are not all electroplated, and accomplish from the aluminum cavity that to be electroplated onto the time of accomplishing device assembling and sealing be two weeks, and coating surface is wiped spot again after being glued small amount of contaminants; And coating surface was once contacted with corrosive sulfur dioxide gas; Surface 27 is not mingled with macroscopic insulant, iron, cobalt or nickel with the real contact 29 that most of electric current between 18 the coating of surface passes through, between surface 27 and the surface 18 by liner the scale copper 7 of thick, the area 30mm2 of a slice 0.05mm, make that real contact 29 contacts closely between surperficial 27 and surperficial 18; The pressure of long-term contact is 4 newton; In order to part surface oxide or other compound of this metal of the real contact 29 of crushing, seam 24, seam 25, seam 26 usefulness encapsulation process materials are done before the encapsulation process, and screw 8 is twisted not tightly; Need abutment joint 24, seam 25, seam 26 usefulness waterproof coatings to do encapsulation process after the device assembling, guarantee long term seal.
In the embodiment of an electric bridge of the present invention; This electric bridge belongs to the microwave device of the low passive intermodulation of a kind of aluminum cavity box 1 that comprises cover plate, aluminum cavity cover plate 16, screw 8, screw 17, internal circuit 26, coaxial connector 2; Internal circuit 26 fixes with aluminum cavity box; Tighten fixing with screw 17 between the box wall upper edge surfaces 19 that contacts with aluminum cavity cover plate 16 of aluminum cavity box 1, the lower edge that contacts with aluminum cavity box 1 of aluminum cavity cover plate 16 surface 22; Tighten fixing with screw 8 between coaxial connector 2 and aluminum cavity box 1, the aluminum cavity cover plate 16; The surface 18 of the cylindrical breach 5 that aluminum cavity box 1 sidewall forms is used to contact the outer surface 27 of the cylindrical protrusions 6 of stretching to aluminum cavity box 1 of coaxial connector 2; Surface 18 oxidized aluminium laminations 9 cover, and the aluminum cavity cover plate 16 of device has the inner wall surface 23 of forming cavity with aluminum cavity box, has seam 24 between aluminum cavity box 1, the aluminum cavity cover plate 16 on the device outer surface; Have seam 25 between coaxial connector 2, the aluminum cavity box 1 on the device outer surface, have seam 26 between coaxial connector 2 and the aluminum cavity cover plate 16 on the device outer surface.The inner wall surface 20 of the surface 18 of electric bridge and aluminum cavity box 1 has been electroplated one deck particulate metal coating 15, and the ferromagnetic metal iron in particulate metal, cobalt, nickel content are no more than 3%, and particulate metal is a tin; Particulate metal thickness of coating is 4um; Do not have to be provided with the coating that comprises nickel between particulate metal coating and the aluminum cavity surface, one deck particulate metal coating has all been electroplated on the surface 19 of microwave device, surperficial 22 and surperficial 23, and the real contact that the most of electric current between surface 27 and the surface 22, between the surface 19 and surperficial 22 passes through is not mingled with macroscopic insulant, iron, cobalt or nickel; Contain the part cavity wall that can conduct electricity between surface 27 and the surface 22; Real contact contact is tight, and the pressure of long-term contact is 40 newton, in order to part surface oxide or other compound of this metal of the real contact of crushing; The real contact 29 that most of electric current between the coating on surface 27 and surface 18 passes through is not mingled with macroscopic insulant, iron, cobalt or nickel; Real contact 29 contacts are tight, and the pressure of long-term contact is 40 newton, in order to part surface oxide or other compound of this metal of the real contact 29 of crushing; Time restriction from aluminum cavity completion electrotinning to assembling of completion device and sealing is within a week; And the aluminum cavity accomplishes and to put into polybag behind the electrotinning immediately and vacuumize temporaryly, begins to accomplishing device assembling and sealing from opening polybag, and time restriction is in one hour; Coating surface can only contact with normal air therebetween; Avoid coating surface to contact with corrosive gas, the size of the size of the cylindrical breach 5 of device and the cylindrical protrusions 6 of coaxial connector 2 is complementary, and the size of tightening up column type breach 5 is set; Make that the pressure that real contact 29 contacts for a long time between the surface 27 and surperficial 18 are 40 newton; Seam 24, seam 25, seam 26 usefulness encapsulation process materials are done before the encapsulation process, and screw 8 will be tightened, in order to avoid long-term the use causes the encapsulation process material crack to occur; Device assembling back abutment joint 24, seam 25, seam 26 usefulness waterproof coatings are done encapsulation process, guarantee long term seal.
In the embodiment of a mixer of the present invention, comprise aluminum cavity box 1, aluminum cavity cover plate 16, screw 8, screw 17, internal circuit 26, the coaxial connector 2 of cover plate.Internal circuit 26 fixes with aluminum cavity box; Tighten fixing with screw 17 between the box wall upper edge surfaces 19 that contacts with aluminum cavity cover plate 16 of aluminum cavity box 1, the lower edge that contacts with aluminum cavity box 1 of aluminum cavity cover plate 16 surface 22; Tighten fixing with screw 8 between coaxial connector 2 and aluminum cavity box 1, the aluminum cavity cover plate 16; The surface 18 of the cylindrical breach 5 that aluminum cavity box 1 sidewall forms is used to contact the outer surface 27 of the cylindrical protrusions 6 of stretching to aluminum cavity box 1 of coaxial connector 2; Surface 18 oxidized aluminium laminations 9 cover; The aluminum cavity cover plate 16 of device has the inner wall surface 23 of forming cavity with aluminum cavity box; Have seam 24 between aluminum cavity box 1, the aluminum cavity cover plate 16 on the device outer surface, have seam 25 between coaxial connector 2, the aluminum cavity box 1 on the device outer surface, have seam 26 between coaxial connector 2 and the aluminum cavity cover plate 16 on the device outer surface.On the outer surface 18 of cylindrical breach 5, has pad 7.
Fig. 4 A illustrates the cylindrical breach that mixer contains pad and does not electroplate contact area local detail sketch map.Shown in Fig. 4 A, form by alumina layer 9 on the inner surface 18 of aluminum cavity box 1, on outer surface 18, be formed with pad 7.The outer surface 27 of cylindrical protrusions 6 contacts with the pad 7 of surface on 18.Fig. 4 B is that the cylindrical breach that mixer contains pad has been electroplated contact area local detail sketch map.Shown in Fig. 4 B, form on the inner surface 18 of aluminum cavity box 1 by alumina layer 9, be electroplate with a coat of metal 15 at the outer surface of alumina layer 9, on outer surface 18, be formed with pad 7.The outer surface 27 of cylindrical protrusions 6 contact formation contact 29 with the pad 7 of surface on 18.The inner wall surface 20 of the surface 18 of mixer device and aluminum cavity box 1 has been electroplated one deck particulate metal coating 15, and the ferromagnetic metal iron in particulate metal, cobalt, nickel content are no more than 3%, and particulate metal is a copper; Electroplate and adopt the alkaline copper plating mode, particulate metal thickness of coating is 3um, does not have to be provided with the coating that comprises nickel between particulate metal coating and the aluminum cavity surface; One deck particulate metal coating has all been electroplated on the surface 19 of device, surface 22 and surface 23; The real contact that most of electric current between surface 27 and the surface 22, between the surface 19 and surperficial 22 passes through is not mingled with macroscopic insulant, iron, cobalt or nickel, is not mingled with the part cavity wall that can conduct electricity between surface 27 and the surface 22, but directly contact; Real contact contact closely; The pressure of long-term contact is 15 newton, in order to part surface oxide or other compound of this metal of the real contact of crushing, between the surface 27 and surperficial 18 by liner the scale copper 7 of thick, the area 50mm2 of a slice 0.15mm; Make that the pressure that real contact 29 contacts for a long time between the surface 27 and surperficial 18 are 15 newton; The real contact 29 that most of electric current between the coating on surface 27 and surface 18 passes through is not mingled with macroscopic insulant, iron, cobalt or nickel, and real contact 29 contacts are tight, and the pressure of long-term contact is 15 newton; Part surface oxide or other compound of this metal in order to the real contact 29 of crushing; From the aluminum cavity accomplish be electroplated onto accomplish device assembling and sealing time restriction within a week, and coating surface keeps clean, and coating surface can only contact with normal air; Avoid coating surface to contact with corrosive gas; Seam 24, seam 25, seam 26 usefulness encapsulation process materials are done before the encapsulation process, and screw 8 will be tightened, in order to avoid long-term the use causes the encapsulation process material crack to occur; Device assembling back abutment joint 24, seam 25, the common glue of seam 26 usefulness are done encapsulation process, guarantee long term seal.
Fig. 5 A-5B illustrates the sketch map according to microwave device cavity two power splitters of the present invention.Wherein, Fig. 5 A illustrates aluminum cavity, internal circuit, the coaxial connector sketch map of cavity two power splitters; Fig. 5 B illustrates the end face example sketch map of cavity two power splitters.The profile of the quantity of coaxial connector, position and aluminum cavity does not constitute the restriction to the device flesh and blood among Fig. 5 A.Fig. 6 A is that sketch map is not electroplated on the surface that the aluminum cavity of cavity two power splitters contacts with coaxial connector, and Fig. 6 B is that sketch map has been electroplated on the surface that the aluminum cavity of cavity two power splitters contacts with coaxial connector.These cavity two power splitters comprise aluminum cavity 71, internal circuit 72, coaxial connector 73.Aluminum cavity 71 has the surface 75 that contacts with coaxial connector 73; Surface 75 oxidized aluminium laminations cover; Coaxial connector 73 has the surface 76 that contacts with aluminum cavity 71; Tighten fixingly between the surface 75 and surperficial 76 along screw thread 81, have seam 78 between coaxial connector 73 and the aluminum cavity 71 on the device outer surface.One deck particulate metal coating 77 has been electroplated on the inner wall surface 74 of the aluminum cavity 71 of device and surface 75, and the ferromagnetic metal iron in particulate metal, cobalt, nickel content are no more than 3%, and particulate metal for example is a gold; Particulate metal thickness of coating for example is 1um; Be provided with the coating that comprises nickel between particulate metal coating and the aluminum cavity surface, the real contact 80 that the most of electric current between surface 75 and the surface 76 passes through is not mingled with macroscopic insulant, iron, cobalt or nickel, and real contact 80 contacts closely; The pressure of long-term contact is 1 newton; In order to part surface oxide or other compound of this metal of the real contact 80 of crushing, screw thread 81 is twisted not tightly, and accomplishing the time that is electroplated onto assembling of completion device and sealing from the aluminum cavity was 3 weeks; And coating surface is glued small amount of contaminants; And coating surface was once contacted with corrosive gas nitrogen dioxide, and the common glue of device assembling back abutment joint 78 usefulness is done encapsulation process, guarantees long term seal.
Continue to introduce the embodiment of cavity three power splitters below with reference to figure 5A-5B.Fig. 5 A illustrates aluminum cavity, internal circuit, the coaxial connector sketch map of cavity three power splitters; Fig. 5 B illustrates the end face example sketch map of cavity three power splitters.The profile of the quantity of coaxial connector, position and aluminum cavity does not constitute the restriction to the device flesh and blood among Fig. 5 A.Fig. 6 A is that sketch map is not electroplated on the surface that the aluminum cavity of cavity three power splitters contacts with coaxial connector, and Fig. 6 B is that sketch map has been electroplated on the surface that the aluminum cavity of cavity three power splitters contacts with coaxial connector.These cavity three power splitters belong to the microwave device of the low passive intermodulation that a kind of aluminum cavity 71 by no cover plate, internal circuit 72, coaxial connector 73 form; Aluminum cavity 71 has the surface 75 that contacts with coaxial connector 73; Surface 75 oxidized aluminium laminations 79 cover; Coaxial connector 73 has the surface 76 that contacts with aluminum cavity 71, tightens fixingly between the surface 75 and surperficial 76 along screw thread 81, has seam 78 between coaxial connector 73 and the aluminum cavity 71 on the device outer surface.One deck particulate metal coating 77 has been electroplated on the inner wall surface 74 of the aluminum cavity 71 of device and surface 75, and the ferromagnetic metal iron in particulate metal, cobalt, nickel content are no more than 3%, and particulate metal is a zinc; Particulate metal thickness of coating is 4um; Do not have to be provided with the coating that comprises nickel between particulate metal coating and the aluminum cavity surface, the real contact 80 that the most of electric current between surface 75 and the surface 76 passes through is not mingled with macroscopic insulant, iron, cobalt or nickel, and real contact 80 contacts closely; The pressure of long-term contact is 40 newton; In order to part surface oxide or other compound of this metal of the real contact 80 of crushing, screw thread 81 is tightened, and causes the encapsulation process material crack to occur in case repeatedly use for a long time; Time restriction from aluminum cavity completion electrotinning to assembling of completion device and sealing is within a week; And the aluminum cavity accomplishes and to put into polybag behind the electrotinning immediately and vacuumize temporaryly, begins to accomplishing device assembling and sealing from opening polybag, and the time need be limited in one hour; Coating surface can only contact with normal air therebetween; Avoid coating surface to contact, need abutment joint 78 usefulness waterproof coatings to do encapsulation process after the device assembling, guarantee long term seal with corrosive gas.
Through the foregoing description experimental verification; Microwave device among the disclosure embodiment is with the bottleneck of the indoor covering of 3G GSM---and the passive intermodulation index of passive device has been improved 3dB at least; Generally improve more than the 10dB, reach-130～-150dBc40dBm*2, and maintain a long-term stability.If be used in the indoor distributed system, be used as and the supporting Primary Component that can bear high-power signal of RRU, expectation can improve the indoor coverage of present RRU difficult situation less than normal.Embodiment of the present disclosure can also free system integrator, operator from endless RSSI regulation trap, practice thrift RRU equipment investment, energy-saving and cost-reducing, saving human cost, is convenient to popularize.If disclosed technical scheme can be promoted, thereby will optimize allocation of resources, promote the development of 3G industry through practicing thrift RRU quantity.Technical scheme of the present disclosure is applicable to WLAN and other GSM too.Technical scheme of the present disclosure is applicable to that also other has the system of high-power wireless emitter, needs reduction passive intermodulation.
Introduce the flow chart of an embodiment of the manufacturing approach of low passive intermodulation device of the present invention below with reference to figure 7, this low passive intermodulation device can with the supporting use of high-power wireless transmitter.
As shown in Figure 7; Step 702; Coaxial connector and sealable cavity are provided, with the electroplating surface that contacts with the coaxial connector outer conductor of cavity inner wall and cavity one deck particulate metal coating, the ferromagnetic metal iron in particulate metal, cobalt, nickel content are no more than 3%; Particulate metal is a kind of in gold, silver, copper, tin, the zinc or several kinds of alloys that metal forms wherein, and particulate metal thickness of coating is 1～8um.
Step 704 confirms that the real contact that the most of electric current between aluminum cavity and the coaxial connector outer conductor passes through is not mingled with macroscopic insulant, iron, cobalt or nickel;
Passive device of the present disclosure, can with the supporting use of high-power wireless transmitter, have low passive intermodulation desired value, can be used for radio communication, radar system etc.Especially in mobile communication, can be adaptable across indoor distributed system.
So far, described in detail according to microwave device of the present invention and manufacturing approach thereof.For fear of covering design of the present invention, details more known in the field are not described.Those skilled in the art can understand fully and how implement technical scheme disclosed herein according to top description.
Though specific embodiments more of the present invention are specified through example, it should be appreciated by those skilled in the art that above example only is in order to describe, rather than in order to limit scope of the present invention.It should be appreciated by those skilled in the art, can under situation about not departing from the scope of the present invention with spirit, above embodiment be made amendment.Scope of the present invention is limited accompanying claims.
Claims (17)
1. a microwave device comprises aluminum cavity and coaxial connector, it is characterized in that, the sidewall of said aluminum cavity is formed with breach, and said coaxial connector has the convexity with the breach of said aluminum cavity coupling;
Wherein, the outer surface of the inner surface of said breach and said convexity contacts; The inner surface of said breach has the coat of metal, and the said coat of metal is one or several the alloy in gold, silver, copper, tin, the zinc; Ferromagnetic metal content is no more than 3% in the said coat of metal; Contact between the inner surface of said breach and the outer surface of said convexity does not comprise insulant or ferromagnetic metal; The contact pressure of said contact is in 1～500 newton.
2. device according to claim 1 is characterized in that the inner surface of said aluminum cavity has the said coat of metal.
3. device according to claim 1 is characterized in that, fixes along screwed between the inner surface of said breach and the outer surface of said convexity; The inner surface of said aluminum cavity has the said coat of metal.
4. device according to claim 1 is characterized in that, the said al-made chamber bodily form becomes airtight cavity.
5. device according to claim 1 is characterized in that, said aluminum cavity comprises aluminum cavity box, aluminum cavity cover plate, fixes through screw between said aluminum cavity box and the said cavity cover plate; Said aluminum cavity box internal fixation has circuit module; Said coaxial connector and said aluminum cavity are fixed through screw; Said aluminum cavity box and said cavity cover plate and coaxial connector three seam between any two is through the encapsulation process of encapsulation process material.
6. device according to claim 5 is characterized in that the inner surface of the breach of said aluminum cavity is formed with pad.
7. device according to claim 5 is characterized in that, said encapsulation process material is waterproof coating or common glue.
8. device according to claim 1 is characterized in that, said aluminum cavity comprises the aluminum cavity of no cover plate, in the said aluminum cavity circuit is arranged; Said aluminum cavity has the inner surface that contacts with said coaxial connector; Said coaxial connector has the outer surface that contacts with said aluminum cavity; Fix along screwed between the inner surface of said aluminum cavity and the outer surface of said coaxial connector, said microwave device assembling back is done encapsulation process to the seam between said coaxial connector and the said aluminum cavity with the encapsulation process material.
9. device according to claim 1 is characterized in that, the long-term contact pressure of said contact is in 4～40 newton.
10. device according to claim 1 is characterized in that, said breach is cylindrical breach, and said convexity is a cylindrical protrusions.
11. device according to claim 1 is characterized in that, said ferromagnetic metal comprises iron, cobalt, nickel.
12. device according to claim 1 is characterized in that, the thickness of the said coat of metal is 1-8um, perhaps 1-4um.
13. device according to claim 1 is characterized in that, said microwave device is coupler, mixer, electric bridge or cavity power splitter.
14. the manufacturing approach of a microwave device is characterized in that, comprising:
Coaxial connector and aluminum cavity are provided; Said aluminum cavity inner wall is electroplate with the coat of metal with said aluminum cavity with the surface that said coaxial connector outer conductor contacts; The said coat of metal is a kind of in gold, silver, copper, tin, the zinc or several kinds alloy wherein, and the ferromagnetic metal content in said particulate metal is no more than 3%;
Confirm that the contact between said aluminum cavity and the said coaxial connector outer conductor is not mingled with macroscopic insulant and ferromagnetic metal;
The pressure of the long-term contact of said contact is controlled at 1～500 newton;
Said microwave device assembling back is done encapsulation process to the seam between said aluminum cavity and said aluminum cavity and the said coaxial connector with the encapsulation process material.
15. method according to claim 13 is characterized in that, said metal layer thickness is 1～8um.
16. method according to claim 13 is characterized in that, said ferromagnetic metal comprises iron, cobalt, nickel.
17. method according to claim 13 is characterized in that, said encapsulation process material is waterproof coating or common glue.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102984109A (en) * | 2012-10-31 | 2013-03-20 | 西安空间无线电技术研究所 | Method for determining space microwave component set phase multi-carrier multipactor threshold |
| CN104600410A (en) * | 2014-12-31 | 2015-05-06 | 镇江市明基电子有限公司 | Cavity power divider housing |
| CN103200806B (en) * | 2013-04-11 | 2015-10-14 | 江苏东翔电子科技有限公司 | Mobile network signals compensates amplifying device |
| CN105745783A (en) * | 2013-08-15 | 2016-07-06 | 西门子有限责任公司 | Device for radio-frequency power coupling and method of using the device |
| CN111370952A (en) * | 2020-03-26 | 2020-07-03 | 四川大学 | Signal connection device with micro-discharge inhibiting function |
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| CN101064402B (en) * | 2006-04-29 | 2010-09-08 | 中国电子科技集团公司第二十三研究所 | Low intermodulation RF coaxial connector |
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| CN101064402B (en) * | 2006-04-29 | 2010-09-08 | 中国电子科技集团公司第二十三研究所 | Low intermodulation RF coaxial connector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102984109A (en) * | 2012-10-31 | 2013-03-20 | 西安空间无线电技术研究所 | Method for determining space microwave component set phase multi-carrier multipactor threshold |
| CN102984109B (en) * | 2012-10-31 | 2015-07-08 | 西安空间无线电技术研究所 | Method for determining space microwave component set phase multi-carrier multipactor threshold |
| CN103200806B (en) * | 2013-04-11 | 2015-10-14 | 江苏东翔电子科技有限公司 | Mobile network signals compensates amplifying device |
| CN105745783A (en) * | 2013-08-15 | 2016-07-06 | 西门子有限责任公司 | Device for radio-frequency power coupling and method of using the device |
| CN104600410A (en) * | 2014-12-31 | 2015-05-06 | 镇江市明基电子有限公司 | Cavity power divider housing |
| CN111370952A (en) * | 2020-03-26 | 2020-07-03 | 四川大学 | Signal connection device with micro-discharge inhibiting function |
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| CN102509839B (en) | 2014-05-28 |
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