CN101335905B - GSM/DCS/WCDMA tri-frequency combiner - Google Patents
GSM/DCS/WCDMA tri-frequency combiner Download PDFInfo
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- CN101335905B CN101335905B CN2007100288269A CN200710028826A CN101335905B CN 101335905 B CN101335905 B CN 101335905B CN 2007100288269 A CN2007100288269 A CN 2007100288269A CN 200710028826 A CN200710028826 A CN 200710028826A CN 101335905 B CN101335905 B CN 101335905B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a GSM/DCS/WCDMA three-frequency combiner, which, on one hand, selects a distribution parameter type capacitance to substitute the conventional applied capacitance; on the other hand, physically separates the DC channel and RF channel in the combiner, and slickly combines all components including capacitance in physics. Because of re-layout to the overall structure of the combiner, the invention has advantages of small size, small insertion loss, large power capacity, high inter-channel isolation degree and the like.
Description
Technical field
The present invention relates to close between a kind of GSM of being used for, DCS and the WCDMA system treatment facility on road, relate in particular to the GSM/DCS/WCDMA tri-frequency combiner.
Background technology
Along with developing rapidly of mobile communication, the application mode of multisystem colocation site, common antenna feeder resource obtains the favor of increasing operator.Can reach by these modes and to cause shared resource, reduce the effect of system equipment cost.In the GSM/DCS/WCDMA co-space feedback system, the tri-frequency combiner microwave device that is absolutely necessary, it mainly acts on is that signal to different system carries out a deciliter road, to reach the saving feeder cable, simplified system and the purpose that reduces cost.In addition, the power supply of equipment realizes by radio frequency cable on the base station towers, so the mixer that is connected in series with feeder cable also will have logical galvanic function.
With reference to schematic diagram shown in Figure 1, mixer is four port microwave devices, comprise two DC feedback paths and three radiofrequency signal paths, wherein: the DC feedback path is made up of lightning protection components such as lumped parameter low pass filter, switch and discharge tubes, low pass filter is used to suppress the high-frequency radio frequency signal, to allow the control signal of certain frequency (as 2.176MHz) pass through smoothly, whether switch is used for selecting to need direct current to pass through; The radiofrequency signal path is made up of electric capacity and band pass filter, and the free transmission range of the band pass filter in three radiofrequency signal paths adapts to the frequency range setting of three road signals on the road of closing.During work, the signal of importing from public port Port1 shunts to port Port2 and port Port3 and Port4 according to frequency range, on the contrary, also the signal from port Port2 and Port3 and Port4 input can be closed road output through port Port1.
The radio frequency signal frequency scope of GSM/DCS/WCDMA co-space feedback system is 806MHz-960MHz, 1710MHz-
And 1920MHz-2170MHz, realize the working band of so super width,
And have perfectly straight stream electric work energy, present most of mixer product adopts the form realization of dielectric substrate with microstrip circuit.The shortcoming of the product of this version is that volume is big, and power capacity is little.And the passive intermodulation index depends on the characteristic of dielectric substrate material greatly, is difficult to control in batch process.
Summary of the invention
The object of the present invention is to provide a kind of GSM/DCS/WCDMA tri-frequency combiner, make its miniaturization, and reach that Insertion Loss is little, power capacity is big and DC feedback path and radiofrequency signal path between effect such as isolation height.
For solving technical problem of the present invention, the present invention adopts following technical scheme to realize:
GSM/DCS/WCDMA tri-frequency combiner of the present invention, handle on the road of closing that is used to finish GSM, DCS, three different frequency band signals of WCDMA, by GSM port, GSM band pass filter, public capacitance, close road port and electrically connect successively and constitute the GSM radio frequency path; By DCS port, DCS electric capacity, DCS band pass filter, public capacitance, close road port and electrically connect successively and constitute the DCS radio frequency path; By WCDMA port, WCDMA electric capacity, WCDMA band pass filter, public capacitance, close road port and electrically connect successively and constitute the WCDMA radio frequency path; And be connected in the DCS port and close road port, and be connected in the WCDMA port and close two DC channel between the road port; Described public capacitance, WCDMA electric capacity and DCS electric capacity are distributed constant formula electric capacity.
Described each electric capacity includes inner wire, insulator and sleeve, and insulator is set in the inner wire periphery, and sleeve then is set in the insulator periphery, and described sleeve is used for electrically connecting with the band pass filter of adjacency; Described inner wire is used for electrically connecting with the DC channel of adjacency, and and then is connected to each port of its adjacency.
Described band pass filter includes some resonance posts, can be provided with the backbone that is used to strengthen coupling effect between adjacent two resonance posts.
Described DCS band pass filter adopts the mode of windowing to realize inductive coupled; The employing of WCDMA band pass filter flies the bar mode and realizes the capacitive coupling.
Described DCS and WCDMA band pass filter are near closing the shared resonance post in road port place.
Described DC channel comprise be connected in close road port and DCS port or and the WCDMA port between low pass filter and discharge tube.
This mixer forms based on a case construction, and this casing comprises body, circuit board and lid, and each band pass filter is arranged in the body and by metal wall to be separated mutually, and the body outside sets firmly described each port, and each electric capacity places each port inboard; Bodies top also is provided with some strutting pieces, the described low pass filter of installing on the strutting piece, and described discharge tube and switch then are fixed on this circuit board; Described lid and body locking.
Corresponding three band pass filters of described circuit board are provided with and pass through the some tuning screw rod that circuit board gos deep into band pass filter, are used to regulate resonance frequency and coupling amount.
Described DC channel also comprises switch, and the printed wire in the DC channel is provided with some places to be interrupted, and discontinuities is provided with groove, and groove is provided with conductive connector alternatively to realize on-off action.
Leave between described strutting piece upper surface and the circuit board bottom surface and be not less than 0.2 mm clearance.
Described lid offers through hole, and this through hole is coated with the Ge Er ventilated membrane
The through hole of described lid is provided with protective plate.
Compared with prior art, the present invention has following beneficial effect: the tri-frequency combiner that the present invention realizes with band pass filter, utilize unique mode, and realize the mutual isolation between DC channel and radiofrequency signal path.The application of distributed constant formula electric capacity, make and use product of the present invention reduced volume greatly, improved power capacity, and, the present invention has carried out layout to overall structure, especially the technology by the common resonant post, the improvement by structure have brought also that Insertion Loss is little, interchannel isolation advantages of higher.
Description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is a product combination structural perspective of the present invention;
Fig. 3 is the enlarged drawing of A part among Fig. 2;
Fig. 4 is the end face view of body part of the present invention.
Embodiment
The signal that GSM/DCS/WCDMA tri-frequency combiner of the present invention is mainly used in multiple frequency closes the road, specifically sees also products in kind shown in Figure 2.
Among Fig. 2, mixer integral body is a casing, is made up of jointly body 6, circuit board 2 and lid 4.
The right edge of body 6 is provided with WCDMA port Port2 and DCS port Port3 and GSM port Port4, be respectively applied for the radiofrequency signal that receives 1920-2170MHz and 1710-1880MHz and 806MHz-960MHz, limit, body 6 left side then is provided with closes road port Port1, close road port Port1 exportable by WCDMA port and DCS port and GSM port (Port2 and Port3 and Port4) radiofrequency signal after synthetic, but or input signal shunt to WCDMA or DCS port or GSM port (Port2 and Port3 and Port4).
Integrated three radio frequency paths on the body 6, promptly be used to transmit the WCDMA radio frequency path and the GSM radio frequency path that is used to transmit the DCS radio frequency path of DCS signal and is used to transmit the GSM signal of WCDMA signal, the WCDMA radio frequency path is by WCDMA port Port2, WCDMA electric capacity 68 ' (consulting Fig. 4), WCDMA band pass filter 610, public capacitance 68, closes road port Port1 and electrically connects composition successively; The DCS radio frequency path is then by DCS port Port3, DCS electric capacity 68 ＂ (consulting Fig. 4), DCS band pass filter 620, public capacitance 68, closes road port Port1 and electrically connects composition successively; The GSM radio frequency path by GSM port Port4, metal conduction band 632, GSM band pass filter, public capacitance 68, close road port Port1 and electrically connect successively and form.
As seen, each radio frequency path all independently comprises a band pass filter (610 or 620 or 630), and comprises described public capacitance 68 jointly.
Each band pass filter 610,620,630 all adopt the mode of coaxial resonant cavity to realize, comprise some resonance posts 611,621,631, as Fig. 2 and shown in Figure 4, the cavity that body 6 middle parts form is divided into three parts by the metal wall 81 and 82 of two abnormity, and corresponding WCDMA radio frequency path is a WCDMA band pass filter 610, corresponding DCS radio frequency path then is a DCS band pass filter 620, and corresponding GSM path then is a GSM band pass filter 630. Metal wall 81 and 82 separation make WCDMA and DCS and GSM radio frequency path have higher isolation.In the WCDMA band pass filter 610, be provided with 8 resonance posts 611 in turn, wherein, the resonance post 611 of contiguous WCDMA port Port2 is by WCDMA electric capacity 68 ' be coupled to WCDMA port Port2; DCS band pass filter 620 is provided with 7 resonance posts 621 in turn, and the resonance post 621 of its contiguous DCS port Port3 is coupled to DCS port Port3 by DCS electric capacity 68 ＂.A contiguous resonance post 6012 that closes road port Port1 place belongs to WCDMA and DCS band pass filter 610 and 620 is shared, promptly in fact the resonance post total amount of two filters is 14, and the signal that this shared resonance post 6012 can make two band pass filters 610 and 620 transfers to jointly by lead 672 in the mode of electromagnetic resonance and closes road port Port1.Described GSM band pass filter is provided with 4 resonance posts 631 in turn, the resonance post 631 on the left side electrically connects by lead 673 and public capacitance 68, consider that its shared space is less, therefore, the resonance post 631 of right-hand member directly is electrically connected to GSM port Port4 from a resonance post of end by described metal conduction band 632.
Fig. 2 and Fig. 4 as seen, the metal wall 81 and 82 between described three band pass filters 610 and 620 and 630 does not cut off the contact of two band pass filters 610,620 fully.
For guaranteeing the isolation of WCDMA radio-frequency channel, the mode that pairing WCDMA band pass filter 610 usefulness fly bar 628 has been added two capacitive couplings, gives birth to two at passband left end common property and suppresses limit.
Be to guarantee the isolation of DCS radio-frequency channel, the mode that pairing DCS band pass filter 620 usefulness are windowed added two inductive coupled, give birth to two inhibition limits at passband right-hand member and common property.
See also Fig. 2, Fig. 3 and Fig. 4, described WCDMA, DCS electric capacity and public capacitance 68 ', 68 ＂, 68, its internal structure is all with public capacitance 68, and public capacitance 68 specifically comprises inner wire 683, insulator 682 and sleeve 681, insulator 682 is set in inner wire 683 peripheries, 681 in sleeve is set in insulator 682 peripheries, and insulator 682 usefulness dielectric films realize that dielectric film adopts polytetrafluoroethylene.Described sleeve 681 electrically connects with the common resonant post 6012 of described WCDMA and DCS band pass filter 610 and 620, and 683 of described inner wires are connected directly to and close road port Port1.So, can form distributed constant formula electric capacity by insulator 682 insulation between sleeve 681 and the inner wire 683, for WCDMA and DCS radio frequency path, radiofrequency signal is by the transmission of the coupling realization signal of 681 in inner wire 683 and sleeve; For two DC channel, be directly connected to inner wire 683 and connect each port, and direct current can not pass through sleeve 681, so just realized that radio frequency path cuts off the effect of direct current.
As previously mentioned, WCDMA and DCS electric capacity 68 ', 68 ＂ adopt the structure identical as public capacitance 68, but WCDMA electric capacity 68 ' sleeve only be connected with WCDMA resonance post 611 WCDMA electric capacity 68 ' adjoining with WCDMA band pass filter 610, the sleeve of DCS electric capacity 68 ＂ then with being connected of DCS band pass filter 620 with the adjoining WCDMA root resonance post 621 of DCS electric capacity 68 ＂.
The inner wire of described each electric capacity is from each port Port1, Port2, and Port3 draws, and therefore, nature electrically connects with each port.
Please consult Fig. 2 again, be fixed with a printed circuit on the described circuit board 2, occupy circuit board 2 both sides main the branch, has been known technology about the DC channel of tri-frequency combiner, only is described below with regard to main improvement of the present invention at this:
In conjunction with Fig. 1, Fig. 2 and Fig. 4, integrated two DC channel on the circuit board 2, i.e. WCDMA DC channel and DCS DC channel, DC channel are mainly by low pass filter 201,202, and 203, composition such as switch, lightning protection component.The WCDMA/DCS DC channel after WCDMA/DCS port Port2/Port3 picks out signal, carry out filtering by WCDMA/DCS low pass filter 202/203 after, synthesize, and export the 3rd low pass filter 201 to, export to again and close road port Port1.Low pass filter 201,202,203 effect are mainly used in the inhibition high-frequency signal and allow the control signal that is lower than 3MHz pass through.In addition, can in two DC channel, switch be set, be used for selecting whether to need direct current to pass through according to needs; The lightning protection component of discharge tube and so on can also be set.
The access point of 3 low pass filters 201,202,203 has been shown in the printed circuit, and described 3 low pass filters 201,202,203 are arranged on independently all on 3 strutting pieces.As shown in Figure 2, near each port Port1, Port2, Port3 at the upper limb of three band pass filters 610,620, is provided with described 3 strutting pieces 641,642,643 respectively.
Described low pass filter 201,202,203 1 terminations are adjacent near port Port1, Port2, the electric capacity of Port3, particularly, this end of the 3rd low pass filter 201 and the inner wire of public capacitance 68 683 electrically connect, this end of WCDMA low pass filter 202 and WCDMA electric capacity 68 ' inner wire electrically connect, this end of DCS low pass filter 203 then electrically connects with the inner wire of DCS electric capacity 68 ＂.Low pass filter 201,202,203 the other end then electrically connects with printed circuit, at this moment, 3 access points of printed circuit just with each strutting piece on 3 low pass filters 201,202,203 engage, and also make low pass filter 201,202,203 successfully insert affiliated DC channel, and circuit board and strutting piece upper surface are reserved and be not less than 0.2 mm clearance, can guarantee the good electrical properties of radiofrequency signal.
Described switch adopts the inductance coil 204 that is welded on the circuit to realize, be used to suppress high-frequency signal, the printed circuit of 204 corresponding positions of inductance coil is interrupted, and removes the connection that inductance coil 204 can disconnect front and back, but inserts 204 restore circuits of inductance coil.
As shown in Figure 2, described low pass filter 201 is to be connected the back with the inner wire 683 of described public capacitance 68 and to close road port Port1 realization electric connection by lead 622, low pass filter 202,203 also in like manner with electric capacity 68 ', the inner wire of 68 ＂ electrically connects.So just ingenious DC channel and the common technical problem of closing road port Port1 that inserts of radio frequency path of having realized.
Fig. 2 and shown in Figure 4 for another example, two band pass filters 610 of the corresponding body 6 in circuit board 2 both sides and 620 also are provided with several tuning screw rods 69.Tuning screw rod 69 passes described circuit board 2, can go deep into the inside of two band pass filters 610,620 when circuit board 2 and body 6 set firmly, and is mainly used in the resonance frequency and the coupling amount of the harmonic oscillator of regulating two band pass filters 610 and 620.
In order to realize the close coupling between the resonance post 611, also backbone can be set between adjacent two resonance posts 611 in two band pass filters 610 and 620, the height of each backbone can not wait, and visual actual conditions are regulated.2 of resonance post and circuit boards should leave appropriate gap, are advisable to be not less than 1.5 millimeters, to satisfy the demand of power capacity.
Please consult Fig. 2 again, also shown is described lid 4, this lid 4 is used for covering mutually with body 6, and inner body is protected, and its periphery can be added a cover cushion rubber, so that strengthen its water resistance, and the protection internal circuit.Also be provided with through hole on these circuit board 2 surfaces, and on this through hole, Ge Er ventilated membrane 40 be set, be used to keep the inside and outside pressure balance of body 6, in addition, splash guard 41 also is set on this through hole with protection Ge Er ventilated membrane 40.
In addition, described two band pass filter 610,620 inner surfaces are silver-plated, can reduce the decay of radiofrequency signal in transmission course greatly, and the insertion loss that makes signal in the passband is less than 0.3dB.
Design of the present invention is not limited to the GSM/DCS/WCDMA co-space feedback system, can also be adapted to co-space feedback system such as 2G/3G, its main points are to adopt the distributed constant formula electric capacity related as above-mentioned embodiment, concrete shape and concrete layout about casing, can make suitable change according to spirit of the present invention, therefore the present invention also is applicable to other tri-frequency combiner, is adapted to multiple co-space feedback system.
In sum, the present invention has overcome the deficiencies in the prior art, after the electrical structure of mixer and physical structure have been carried out whole organic adjustment, has brought following good effect:
Volume is little: the big I of mixer of the present invention is contracted to 220mm*185mm*55mm.Telescopic coupled structure has made full use of closes terminal. inner wire passes the space of inner body wall in mouthful, has both realized radiofrequency signal. coupling, the occupying volume external space not again.Add the lumped parameter low pass filter at DC feedback path and radiofrequency signal path, both guaranteed the isolation between DC feedback path and radiofrequency signal path, the size of the PCB circuit board of circuit board is reduced greatly.
Isolation height:, improved interchannel isolation so greatly because each radio frequency path is the wave-guide cavity wave structure of sealing.WCDMA port Port2 to the isolation of the radiofrequency signal of 1710-1880MHz frequency range, DCS port Port3 to the isolation of the radiofrequency signal of 1920-2170MHz frequency range all greater than 50dB,
Power capacity is big: leave enough gaps between resonance post in the coaxial cavity and coaxial cavity body wall, improved device radiofrequency signal power bearing ability, the average power that every port bears is up to 250 watts.
Claims (12)
1. GSM/DCS/WCDMA tri-frequency combiner, handle on the road of closing that is used to finish GSM, DCS, three different frequency band signals of WCDMA, by GSM port, metal conduction band, GSM band pass filter, public capacitance, close road port and electrically connect successively and constitute the GSM radio frequency path; By DCS port, DCS electric capacity, DCS band pass filter, public capacitance, close road port and electrically connect successively and constitute the DCS radio frequency path; By WCDMA port, WCDMA electric capacity, WCDMA band pass filter, public capacitance, close road port and electrically connect successively and constitute the WCDMA radio frequency path; And be connected in the DCS port and close road port, and be connected in the WCDMA port and close two DC channel between the road port;
It is characterized in that:
Described public capacitance, WCDMA electric capacity and DCS electric capacity are distributed constant formula electric capacity.
2. GSM/DCS/WCDMA tri-frequency combiner according to claim 1, it is characterized in that: described each electric capacity includes inner wire, insulator and sleeve, insulator is set in the inner wire periphery, sleeve then is set in the insulator periphery, and described sleeve is used for electrically connecting with the band pass filter of adjacency; Described inner wire is used for electrically connecting with the DC channel of adjacency, and and then is connected to each port of its adjacency.
3. GSM/DCS/WCDMA tri-frequency combiner according to claim 2 is characterized in that: described band pass filter includes some resonance posts, can be provided with the backbone that is used to strengthen coupling effect between adjacent two resonance posts.
4. GSM/DCS/WCDMA tri-frequency combiner according to claim 3 is characterized in that: described DCS band pass filter adopts the mode of windowing to realize perceptual cross-couplings; The employing of WCDMA band pass filter flies the bar mode and realizes the capacitive cross-couplings.
5. GSM/DCS/WCDMA tri-frequency combiner according to claim 4 is characterized in that: described DCS and WCDMA band pass filter are near closing the shared resonance post in road port place.
6. according to any described GSM/DCS/WCDMA tri-frequency combiner in the claim 1 to 5, it is characterized in that: described DC channel comprises being connected in closes road port and DCS port or low pass filter between the WCDMA port and discharge tube.
7. GSM/DCS/WCDMA tri-frequency combiner according to claim 6, it is characterized in that: this mixer forms based on a case construction, this casing comprises body, circuit board and lid, each band pass filter is arranged in the body and by metal wall to be separated mutually, the body outside sets firmly described each port, and each electric capacity places each port inboard; Bodies top also is provided with some strutting pieces, the described low pass filter of installing on the strutting piece, and described discharge tube and switch then are fixed on this circuit board; Described lid and body locking.
8. GSM/DCS/WCDMA tri-frequency combiner according to claim 7 is characterized in that: corresponding three band pass filters of described circuit board are provided with and pass through the some tuning screw rod that circuit board gos deep into band pass filter, are used to regulate resonance frequency and coupling amount.
9. GSM/DCS/WCDMA tri-frequency combiner according to claim 8, it is characterized in that: described DC channel also comprises switch, printed wire in the DC channel is provided with some places to be interrupted, and discontinuities is provided with groove, and groove is provided with conductive connector to realize on-off action.
10. according to the GSM/DCS/WCDMA tri-frequency combiner described in the claim 9, it is characterized in that: leave between described strutting piece upper surface and the circuit board bottom surface and be not less than 0.2 mm clearance.
11. GSM/DCS/WCDMA tri-frequency combiner according to claim 10 is characterized in that: described lid offers through hole, this through hole is coated with the Ge Er ventilated membrane, and the through hole of described lid is provided with protective plate.
12. GSM/DCS/WCDMA tri-frequency combiner according to claim 11 is characterized in that: described GSM band pass filter is electrically connected by a metal conduction band and described GSM port.
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| CN2007100288269A CN101335905B (en) | 2007-06-26 | 2007-06-26 | GSM/DCS/WCDMA tri-frequency combiner |
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| CN2007100288269A CN101335905B (en) | 2007-06-26 | 2007-06-26 | GSM/DCS/WCDMA tri-frequency combiner |
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| CN101335905B true CN101335905B (en) | 2011-04-06 |
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| KR101006949B1 (en) | 2010-06-07 | 2011-01-12 | 주식회사 케이티 | System for extending wireless internet coverage |
| CN110085959B (en) * | 2019-05-31 | 2021-03-23 | 重庆邮电大学 | Miniaturized harmonic suppression equal power divider based on H-shaped defected ground artificial transmission line |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2731877Y (en) * | 2004-09-22 | 2005-10-05 | 摩比天线技术（深圳）有限公司 | Route synthetizer for GSM/CDMA co-space feedback system base station |
| CN2775945Y (en) * | 2005-01-26 | 2006-04-26 | 北京东方信联科技有限公司 | PHS/WCDMA WLAN way integrating device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2731877Y (en) * | 2004-09-22 | 2005-10-05 | 摩比天线技术（深圳）有限公司 | Route synthetizer for GSM/CDMA co-space feedback system base station |
| CN2775945Y (en) * | 2005-01-26 | 2006-04-26 | 北京东方信联科技有限公司 | PHS/WCDMA WLAN way integrating device |
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Effective date of registration: 20200115 Address after: 510730 No. 6, layered Road, Guangzhou economic and Technological Development Zone, Guangdong Patentee after: COMBA TELECOM TECHNOLOGY (GUANGZHOU) Ltd. Address before: 510663 Guangzhou Science City, Guangdong Shenzhou Road, No. 10 Patentee before: COMBA TELECOM SYSTEMS (CHINA) Ltd. |
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Effective date of registration: 20230804 Address after: 510730, No. 6, Jin Lu, Guangzhou economic and Technological Development Zone, Guangdong, Guangzhou Patentee after: COMBA TELECOM TECHNOLOGY (GUANGZHOU) Ltd. Patentee after: COMBA TELECOM SYSTEMS (GUANGZHOU) Ltd. Address before: 510730 No. 6, layered Road, Guangzhou economic and Technological Development Zone, Guangdong Patentee before: COMBA TELECOM TECHNOLOGY (GUANGZHOU) Ltd. |
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