US20130299125A1 - Cooling system and method for cooling radio unit - Google Patents

Cooling system and method for cooling radio unit Download PDF

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Publication number
US20130299125A1
US20130299125A1 US13/667,462 US201213667462A US2013299125A1 US 20130299125 A1 US20130299125 A1 US 20130299125A1 US 201213667462 A US201213667462 A US 201213667462A US 2013299125 A1 US2013299125 A1 US 2013299125A1
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United States
Prior art keywords
cooling
air duct
unit
active antenna
heat sink
Prior art date
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Abandoned
Application number
US13/667,462
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English (en)
Inventor
Jian Shi
Stephen Haworth
Yi Zhang
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication date
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Assigned to HUAWEI TECHNOLOGIES CO., LTD. reassignment HUAWEI TECHNOLOGIES CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAWORTH, STEPHEN, SHI, JIAN, ZHANG, YI
Publication of US20130299125A1 publication Critical patent/US20130299125A1/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
    • H01L23/467—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing gases, e.g. air
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
    • H01L23/367—Cooling facilitated by shape of device
    • H01L23/3672—Foil-like cooling fins or heat sinks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/03—Constructional details, e.g. casings, housings
    • H04B1/036—Cooling arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Definitions

  • the present application relates to a cooling system for cooling at least one heat generating radio unit in an active antenna system unit.
  • the application also relates to a method for cooling at least one heat generating radio unit in an active antenna system unit.
  • radio units emit heat, i.e. the radio unit comprises heat generating components whereby the radio unit needs to be cooled.
  • the radio unit may be cooled using a heat sink by thermally connecting the radio unit against the heat sink base in order to be able to transfer heat from the radio unit to the heat sink and from there to the ambient air.
  • the heat sink is further generally arranged with cooling fins in order to improve the cooling of the radio unit.
  • cooling of the heat sink i.e. to arrange a fan that forces a flow of air across the surfaces of the cooling fins of the heat sink thereby replacing air heated by the heat from the cooling fins with cooler ambient air from the outside of the heat sink, thus improving the cooling of the heat sink.
  • a telecom radio unit e.g. a radio transceiver
  • a radio unit is preferably installed or mounted directly on the antenna (i.e. semi-integrated installation) or integrated with the antenna (i.e. integrated installation) on top of a tower or at a similar high mounting position in an active antenna system unit.
  • the active antenna system unit is generally arranged with one end of its longitudinal extension more or less below the other, i.e. arranged more or less in a vertical position, depending on the preferred positioning of the antenna or antennas of the active antenna system unit.
  • the heat sinks of the radio units are arranged with cooling fins extending along the longitudinal extension of the active antenna system unit in order to improve the natural cooling. If more than one radio unit is arranged together with an antenna in an active antenna system unit, the radio units are arranged displaced along the longitudinal extension of the active antenna system unit, i.e. along the longitudinal extension of the antenna or antennas in order to protrude as little as possible outside the antenna face, thereby minimizing the transversal dimensions of the active antenna system unit.
  • cooling fin area e.g. by arranging higher cooling fins, or by arranging a forced cooling.
  • the drawback with these solutions is that the cooling fin dimensions can not be increased indefinitely due to manufacturing difficulties and cost, and that the mounting of cooling fans affect the natural cooling when the fans are not in operation.
  • the object of the present application is to provide an improved cooling system for cooling at least one heat generating radio unit in an active antenna system unit and an improved method for cooling at least one heat generating radio unit in an active antenna system unit.
  • the object is achieved by arranging a cooling system for cooling at least one heat generating radio unit in an active antenna system unit, the cooling system comprising at least one fan and an air duct, where each heat generating radio unit to be cooled by the cooling system is arranged connected to a heat sink unit comprising cooling fins, the heat sink unit being arranged to transfer heat between the radio unit and the ambient air, where the at least one fan is arranged to generate a primary air flow of ambient air in the air duct between at least one air duct inlet and at least one air duct outlet, where the air duct is arranged to extend in the longitudinal direction of the active antenna system unit along each of the said heat sink units and to border on each of the said heat sink units, where the primary air flow generated in the air duct is arranged to flow substantially in the longitudinal direction of the active antenna system unit and is further arranged to generate a secondary air flow of ambient air over a number of cooling fins of each of the said heat sink units, and where the cooling fins to be cooled by the secondary air flow are arranged oriented
  • the object is further achieved by a method for cooling at least one heat generating radio unit in an active antenna system unit using a cooling system, the cooling system comprising at least one fan and an air duct, the method comprising the steps of: connecting each heat generating radio unit to be cooled by the cooling system to a heat sink unit comprising cooling fins, arranging the heat sink unit to transfer heat between the radio unit and the ambient air, arranging the at least one fan to generate a primary air flow of ambient air in the air duct between at least one air duct inlet and at least one air duct outlet, arranging the air duct to extend in the longitudinal direction of the active antenna system unit along each of the said heat sink units and to border on each of the said heat sink units, arranging the primary air flow generated in the air duct to flow substantially in the longitudinal direction of the active antenna system unit and further arranging the primary air flow to generate a secondary air flow of ambient air over a number of cooling fins of each of the said heat sink units, and arranging the cooling fins to be cooled by the secondary air flow to
  • each heat generating radio unit to be cooled by the cooling system is arranged connected to a heat sink unit comprising cooling fins and where at least one fan is arranged to generate a primary air flow of ambient air in an air duct between at least one air duct inlet and at least one air duct outlet, where the air duct is arranged to extend in the longitudinal direction of the active antenna system unit along each of the said heat sink units and to border on each of the said heat sink units, where the primary air flow generated in the air duct is arranged to flow substantially in the longitudinal direction of the active antenna system unit and is further arranged to generate a secondary air flow of ambient air over a number of cooling fins of each of the said heat sink units, and where the cooling fins to be cooled by the secondary air flow are arranged oriented at an angle with respect to the longitudinal direction of the active antenna system unit, the longitudinal extension of the cooling fins to be cooled by the ambient air flow can be reduced whereby the temperature
  • a further advantage is that the air duct and the fan does not affect the natural cooling when the at least one fan is shut off in situations where forced cooling is not needed, e.g. when the ambient temperature is so low that natural cooling is enough.
  • a further advantage is that the at least one fan and air duct do not increase the volume of the active antenna system unit significantly.
  • a method for cooling at least one heat generating radio unit in an active antenna system unit using a cooling system comprising the steps of: connecting each heat generating radio unit to be cooled by the cooling system to a heat sink unit comprising cooling fins, arranging the heat sink unit to transfer heat between the radio unit and the ambient air, arranging at least one fan to generate a primary air flow of ambient air in an air duct between at least one air duct inlet and at least one air duct outlet, arranging the air duct to extend in the longitudinal direction of the active antenna system unit along each of the said heat sink units and to border on each of the said heat sink units, arranging the primary air flow generated in the air duct to flow substantially in the longitudinal direction of the active antenna system unit and further arranging the primary air flow to generate a secondary air flow of ambient air over a number of cooling fins of each of the said heat sink units, and arranging the cooling fins to be cooled by the secondary air flow to be oriented at an angle with respect to the longitudinal direction of the active antenna system unit, the longitudinal extension of
  • a further advantage is that the air duct and the fan does not affect the natural cooling when the at least one fan is shut off in situations where forced cooling is not needed, e.g. when the ambient temperature is so low that natural cooling is enough.
  • a further advantage is that the at least one fan and air duct do not increase the volume of the active antenna system unit significantly.
  • the at least one air duct outlet is arranged to direct a flow of ambient air over a number of cooling fins of each of the heat sink units.
  • the at least one air duct outlet is arranged along a longitudinal side of the active antenna system unit.
  • the gap size of the air duct outlet is arranged with varying dimensions along the longitudinal direction of the active antenna system unit.
  • a cover is arranged at the air duct to direct the air flow leaving the air duct outlet towards the surface of the heat sink unit.
  • the at least one air duct inlet is arranged to suck a secondary air flow of ambient air over a number of cooling fins of each of the said heat sink units.
  • the at least one air duct inlet is arranged along a longitudinal side of the active antenna system unit.
  • the gap size of the air duct inlet is arranged with varying dimensions along the longitudinal direction of the active antenna system unit.
  • the angle between a cooling fin and the longitudinal direction of the active antenna system unit is arranged to vary along the extension of the cooling fin.
  • a cooling fin is arranged with varying dimensions along the longitudinal extension of the cooling fin.
  • a cooling fin is arranged wave formed or with curved shape along the longitudinal extension of the cooling fin.
  • the at least one fan is a centrifugal fan.
  • the method for cooling a heat generating unit can comprise the step of arranging the at least one air duct outlet to direct a flow of ambient air over a number of cooling fins of each of the heat sink units.
  • the method for cooling a heat generating unit can comprise the step of arranging the at least one air duct inlet to suck a secondary air flow of ambient air over a number of cooling fins of each of the heat sink units.
  • FIG. 1 shows a schematic view of a cooling system according to a first embodiment of the application for cooling at least one heat generating radio unit in an active antenna system unit
  • FIG. 2 shows another schematic view of the cooling system according to FIG. 1 ,
  • FIG. 3 shows a schematic cross-section of an air duct according to one embodiment of the application
  • FIG. 4 shows another schematic cross-section of an air duct according to one embodiment of the application
  • FIG. 5 shows a schematic view of a cooling system according to a second embodiment of the application
  • FIG. 6 shows a schematic view of a cooling system according to a third embodiment of the application.
  • FIG. 7 shows a schematic view of a cooling system according to a fourth embodiment of the application.
  • FIG. 1 shows a schematic view of a cooling system 2 according to a first embodiment of the application for cooling at least one heat generating radio unit 4 , 6 , 8 in an active antenna system unit 10 , the cooling system 2 comprising at least one fan 12 and an air duct 14 , where each heat generating radio unit 4 , 6 , 8 to be cooled by the cooling system 2 is arranged connected to a heat sink unit 16 , 18 , 20 comprising cooling fins 22 , 24 , 26 , 28 , 30 , 32 , the heat sink unit 16 , 18 , 20 being arranged to transfer heat between the radio unit 4 , 6 , 8 and the ambient air 34 , where the at least one fan 12 is arranged to generate a primary air flow 33 of ambient air 34 in the air duct 14 between at least one air duct inlet 36 and at least one air duct outlet 38 , where the air duct 14 is arranged to extend in the longitudinal direction A of the active antenna system unit 10 along each of the said heat sink units 16 , 18 , 20 and
  • the longitudinal extension C of the cooling fins 22 , 24 , 26 , 28 , 30 , 32 to be cooled by the ambient air flow can be reduced when comparing with traditional designs, whereby the temperature of the ambient air flow at the downstream end of the respective cooling fin 22 , 24 , 26 , 28 , 30 , 32 can be reduced, thus increasing the cooling power at this position of the respective heat sink unit 16 , 18 , 20 which is especially advantageous when using radio units 4 , 6 , 8 with heat sinks units 16 , 18 , 20 having large dimensions in the longitudinal direction A of the active antenna system unit 10 .
  • the air duct 14 and the at least one fan 12 do not affect the natural cooling when the at least one fan 12 is shut off in situations where forced cooling is not needed, e.g. when the ambient temperature is so low that natural cooling is enough.
  • the at least one fan 12 is arranged to generate a primary air flow 33 of ambient air 34 in the air duct 14 between at least one air duct inlet 36 and at least one air duct outlet 38 by introducing ambient air 34 into the air duct 14 from at least one air duct inlet 36 and where the air duct outlet 38 is arranged to direct a flow of ambient air 34 over a number of cooling fins 22 , 24 , 26 , 28 , 30 , 32 of each of the said heat sink units 16 , 18 , 20 , where the cooling fins 22 , 24 , 26 , 28 , 30 , 32 are arranged oriented at an angle with respect to the longitudinal direction A of the active antenna system unit 10 .
  • the active antenna system unit 10 comprises at least one heat generating radio unit 4 , 6 , 8 and at least one antenna 40 both arranged along the longitudinal direction A of the active antenna system unit 10 , and further comprises a cooling system for cooling at least one heat generating radio unit 4 , 6 , 8 , where the respective radio unit 4 , 6 , 8 is installed or mounted directly on the antenna (i.e. semi-integrated) or integrated with the antenna (i.e. integrated).
  • the at least one fan 12 is preferably a centrifugal fan arranged at one end of the air duct 14 arranged at one longitudinal side of the active antenna system unit 10 .
  • the at least one fan 12 and the air duct 14 can be arranged as two individual parts that are assembled together on site, or be arranged as an integrated unit.
  • FIG. 2 shows another schematic view of the cooling system 2 according to FIG. 1 , where the direction of flow of ambient air 34 is schematically shown in the figure.
  • the ambient air 34 is introduced into the air duct 14 at at least one air duct inlet 36 , flows 33 through the air duct 14 along the longitudinal direction A of the active antenna system unit 10 , and leaves the air duct 14 at least one air duct outlet 38 directing a flow 35 of ambient air 34 over a number of cooling fins 22 , 24 , 26 , 28 , 30 , 32 of each of the said heat sink units 16 , 18 , 20 , where the cooling fins 22 , 24 , 26 , 28 , 30 , 32 are arranged oriented at an angle ⁇ with respect to the longitudinal direction A of the active antenna system unit 10 .
  • FIG. 3 shows a schematic cross-section of an air duct according to the first embodiment of the application.
  • the cross-section is taken along the longitudinal direction A of the active antenna system unit 10 .
  • the at least one fan 12 , the at least one air duct inlet 36 and the air duct outlet 38 are schematically shown in the figure.
  • the air duct outlet 38 can be arranged to extend along one end of the majority of the cooling fins 22 , 24 , 26 , 28 , 30 , 32 of each of the said heat sink units 16 , 18 , 20 , and the gap size B of the air duct outlet 38 may further be arranged with varying dimensions, e.g.
  • FIG. 4 shows another schematic cross-section of an air duct according to one embodiment of the application.
  • the cross-section is taken transversally to the extension of the air duct 14 , i.e. at a right angle to the cross-section shown in FIG. 3 .
  • the air duct 14 and the air duct outlet 38 are shown in the figure.
  • the direction of the secondary air flow 35 outside the outlet 38 is also indicated in the figure.
  • a cover 42 can be arranged at the air duct 14 to direct the secondary air flow 35 over the cooling fins 22 , 24 , 26 , 28 , 30 , 32 .
  • the cover 42 preferably covers the heat sink units 16 , 18 , 20 only partly.
  • the design with the air duct 14 arranged along a longitudinal side of the active antenna system unit 10 does not affect the natural cooling when the at least one fan is shut off when forced cooling is not needed.
  • the relative position of the cooling fins 22 , 24 , 26 , 28 , 30 , 32 , the at least one heat generating radio unit 4 , 6 , 8 , and the at least one antenna 40 are schematically indicated.
  • a cooling fin 22 , 24 , 26 , 28 , 30 , 32 with varying dimensions, e.g. differing height, along the longitudinal extension C of the cooling fin 22 , 24 , 26 , 28 , 30 , 32 in order to enable more uniform cooling of the at least one heat generating radio unit 4 , 6 , 8 along the length of said cooling fins 22 , 24 , 26 , 28 , 30 , 32 .
  • FIG. 5 shows a schematic view of a cooling system according to a second embodiment of the application.
  • the embodiment shown in FIG. 5 differs from the embodiment shown in FIG. 2 in that the at least one fan 12 is arranged outside the air duct 14 at one end of the air duct 14 .
  • the direction of flow 33 , 35 of ambient air 34 is schematically shown in the figure.
  • the at least one fan 12 is arranged to generate a primary air flow 33 of ambient air 34 in the air duct 14 between at least one air duct inlet 36 and at least one air duct outlet 38 by introducing ambient air 34 into the air duct 14 from at least one air duct inlet 36 and where the air duct outlet 38 is arranged to direct a flow of ambient air 34 over a number of cooling fins 22 , 24 , 26 , 28 , 30 , 32 of each of the said heat sink units 16 , 18 , 20 , where the cooling fins 22 , 24 , 26 , 28 , 30 , 32 are arranged oriented at an angle ⁇ with respect to the longitudinal direction A of the active antenna system unit 10 .
  • FIG. 6 shows a schematic view of a cooling system according to a third embodiment of the application.
  • the embodiment shown in FIG. 6 differs from the embodiment shown in FIG. 2 in that the air duct is arranged with its air duct inlet 36 along a longitudinal side of the active antenna system unit 10 .
  • the direction of flow 33 , 35 of ambient air 34 is schematically shown in the figure.
  • the at least one fan 12 is arranged to generate a primary air flow 33 of ambient air 34 in the air duct 14 between at least one air duct inlet 36 and at least one air duct outlet 38 by introducing ambient air 34 into the air duct 14 from at least one air duct inlet 36 arranged along a longitudinal side of the active antenna system unit 10 , and where the air duct inlet 36 is arranged to suck a secondary air flow 35 of ambient air 34 over a number of cooling fins 22 , 24 , 26 , 28 , 30 , 32 of each of the said heat sink units 16 , 18 , 20 , where the cooling fins 22 , 24 , 26 , 28 , 30 , 32 are arranged oriented at an angle with respect to the longitudinal direction A of the active antenna system unit 10 .
  • the air duct inlet 36 can be arranged to extend along one end of the majority of the cooling fins 22 , 24 , 26 , 28 , 30 , 32 of each of the said heat sink units 16 , 18 , 20 , and the gap size B of the air duct inlet 36 may further be arranged with varying dimensions, e.g. narrowing gap shape, along the extension of the air duct 14 in the longitudinal direction A of the active antenna system unit 10 in order to enable uniform inlet flow of air at the inlet 36 in order to enable substantially uniform cooling along all said cooling fins 22 , 24 , 26 , 28 , 30 , 32 .
  • FIG. 7 shows a schematic view of a cooling system according to a fourth embodiment of the application.
  • the embodiment shown in FIG. 7 differs from the embodiment shown in FIG. 6 in that the at least one fan 12 is arranged outside the air duct 14 at one end of the air duct 14 , and in that only one radio unit 4 with heat sink unit 16 is arranged in the active antenna system unit 10 .
  • the direction of flow 33 , 35 of ambient air 34 is schematically shown in the figure.
  • the at least one fan 12 is arranged to generate a primary air flow 33 of ambient air 34 in the air duct 14 between at least one air duct inlet 36 and at least one air duct outlet 38 by introducing ambient air 34 into the air duct 14 from at least one air duct inlet 36 arranged along a longitudinal side of the active antenna system unit 10 , and where the air duct inlet 36 is arranged to suck a secondary air flow 35 of ambient air 34 over a number of cooling fins 22 , 24 of each of the said heat sink units 16 where the cooling fins 22 , 24 are arranged oriented at an angle with respect to the longitudinal direction A of the active antenna system unit 10 .
  • the application also relates to a method for cooling at least one heat generating radio unit 4 , 6 , 8 in an active antenna system unit 10 using a cooling system 2 , the cooling system 2 comprising at least one fan 12 and an air duct 14 , comprising the steps of: connecting each heat generating radio unit 4 , 6 , 8 to be cooled by the cooling system 2 to a heat sink unit 16 , 18 , 20 comprising cooling fins 22 , 24 , 26 , 28 , 30 , 32 , arranging the heat sink unit 16 , 18 , 20 to transfer heat between the radio unit 4 , 6 , 8 and the ambient air 34 , arranging the at least one fan 12 to generate a primary air flow 33 of ambient air 34 in the air duct 14 between at least one air duct inlet 36 and at least one air duct outlet 38 , arranging the air duct 14 to extend in the longitudinal direction A of the active antenna system unit 10 along each of the said heat sink units 4 , 6 , 8 and to border on each of the said heat sink units 4
  • the method for cooling a heat generating unit 4 can further comprise the step of arranging the at least one air duct outlet 38 to direct a flow of ambient air 34 over a number of cooling fins 22 , 24 , 26 , 28 , 30 , 32 of each of the said heat sink units 16 , 18 , 20 , or can further comprise the step of arranging the at least one air duct inlet 36 to suck a secondary air flow 35 of ambient air 34 over a number of cooling fins 22 , 24 , 26 , 28 , 30 , 32 of each of the said heat sink units 16 , 18 , 20 .
  • the application has been described using straight cooling fins, but it is also possible to arrange the cooling fins with other shapes along their longitudinal extension such as e.g. to arrange a cooling fin wave formed or with curved shape along the longitudinal extension of the cooling fin.
  • the angle ⁇ between a cooling fin and the longitudinal direction A of the active antenna system unit 10 can also be arranged to vary along the extension C of the cooling fin.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
US13/667,462 2012-05-11 2012-11-02 Cooling system and method for cooling radio unit Abandoned US20130299125A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/058812 WO2013167203A1 (en) 2012-05-11 2012-05-11 Cooling system and method for cooling radio unit

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/058812 Continuation WO2013167203A1 (en) 2012-05-11 2012-05-11 Cooling system and method for cooling radio unit

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US (1) US20130299125A1 (zh)
EP (1) EP2681847B1 (zh)
CN (1) CN103548274B (zh)
WO (1) WO2013167203A1 (zh)

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WO2015076486A1 (ko) * 2013-11-25 2015-05-28 엘지전자 주식회사 무선통신 단말기
EP2988424A1 (en) * 2014-08-19 2016-02-24 Huawei Technologies Co., Ltd. Cooling system for radio unit
US20160223184A1 (en) * 2013-09-25 2016-08-04 Iwasaki Electric Co., Ltd. Lamp
WO2016134764A1 (en) * 2015-02-26 2016-09-01 Huawei Technologies Co., Ltd. A radio unit housing and a base station antenna module
US20170223868A1 (en) * 2014-10-16 2017-08-03 Huawei Technologies Co., Ltd. Remote radio unit and active antenna system
US9813082B2 (en) * 2015-10-08 2017-11-07 Futurewei Technologies, Inc. Heat spreader with thermally coductive foam core
WO2019211652A1 (en) * 2018-05-03 2019-11-07 Telefonaktiebolaget Lm Ericsson (Publ) Outdoor radio units with integrated solar cells
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US11056778B2 (en) 2017-04-26 2021-07-06 Telefonaktiebolaget Lm Ericsson (Publ) Radio assembly with modularized radios and interconnects
CN112292817B (zh) * 2018-06-28 2022-04-15 昕诺飞控股有限公司 街道照明杆基座
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Cited By (22)

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US8797226B2 (en) * 2008-12-02 2014-08-05 Andrew Llc Antenna heat fins
US20110260944A1 (en) * 2008-12-02 2011-10-27 Andrew Llc Antenna heat fins
US9879851B2 (en) * 2013-09-25 2018-01-30 Iwasaki Electric Co., Ltd. Lamp having outwardly orientated light source units and inwardly orientated heat sinks with transversely orientated fins
US20160223184A1 (en) * 2013-09-25 2016-08-04 Iwasaki Electric Co., Ltd. Lamp
WO2015076486A1 (ko) * 2013-11-25 2015-05-28 엘지전자 주식회사 무선통신 단말기
KR20150060007A (ko) * 2013-11-25 2015-06-03 엘지전자 주식회사 무선통신 단말기
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WO2013167203A1 (en) 2013-11-14
CN103548274B (zh) 2016-06-08

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