EP1326301A1 - Boitier d'antenne - Google Patents

Boitier d'antenne Download PDF

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Publication number
EP1326301A1
EP1326301A1 EP02259032A EP02259032A EP1326301A1 EP 1326301 A1 EP1326301 A1 EP 1326301A1 EP 02259032 A EP02259032 A EP 02259032A EP 02259032 A EP02259032 A EP 02259032A EP 1326301 A1 EP1326301 A1 EP 1326301A1
Authority
EP
European Patent Office
Prior art keywords
antenna
housing
antenna housing
low attenuation
panels
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02259032A
Other languages
German (de)
English (en)
Inventor
Ernest Roger Collinson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
E Collinson and Co Ltd
Original Assignee
E Collinson and Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by E Collinson and Co Ltd filed Critical E Collinson and Co Ltd
Publication of EP1326301A1 publication Critical patent/EP1326301A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/1242—Rigid masts specially adapted for supporting an aerial
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome

Definitions

  • the present invention relates to an antenna housing.
  • antennas can only be successfully located within a housing if the material for the housing wall has low attenuation characteristics.
  • Fibre glass is a suitable material and is readily suitable for forming a housing wall but it has been found that a housing wall made of a chopped strand fibre glass mat would have to have a thickness of 5/6mm to resist wind speeds of up to 26m/s. However, such a wall thickness has attenuation losses of the order of 3.5dB at a frequency of 2 GHz which is deemed unacceptable. Accordingly, simply replacing the steel sheets with fibre glass has proved unsatisfactory.
  • a further problem is that each antenna array has to have an unobstructed field of view so it is not readily possible to introduce additional bracing to solve the problem with strength.
  • the present invention aims to solve the above mentioned problems.
  • one aspect of the present invention provides an antenna housing comprising a plurality of wall sections of low attenuation material and wherein joints between adjacent wall sections provide rigidity to the structure without impeding radio signals.
  • the housing is preferably cylindrical and its circumference is preferably divided into either six or twelve equal wall sections.
  • the circumferential spacing of the joints is sufficiently large to avoid impinging on the field of view of the radio beam.
  • the construction allows UHF antenna to be arranged to suit individual site requirements.
  • the housing is preferably large enough to house up to 12 UHF antenna of up to 2.5m high on any one level.
  • the antenna may be spaced in groups of either 2, 3, 6 or 12. All or some of the antenna may be located on the same vertical level or on two or more separate levels with a vertical clearance of the order of 0.4m. Each level may be accommodated in a separate antenna housing module.
  • the housing is also capable of accommodating one tier of SHF link antenna whose size can range from 300mm diameter to 800mm diameter and a minimum vertical separation distance of at least 0.4m between antenna.
  • the SHF antenna may be housed in a separate module.
  • the material for the wall sections is chosen to give attenuation of no more than 1dB for the UHF antenna at frequencies of up to 2.2 GHz.
  • the SHF antenna require especially low loss housings, typically of the order of 0.5dB, that will not defract the microwave beam. Accordingly, it is proposed to include low loss 'windows' in the wall sections, where the SHF antenna are located or to utilise material and/or thickness for the wall sections that meet the low loss requirements.
  • the wall sections are formed from a plurality of panels that are secured together.
  • the height of each wall section is determined by the height of the UHF or SHF antenna to be installed including the necessary vertical separation distance between multiple tiers of antenna. The separation distance is required to prevent interference.
  • the wall sections may be used to build up housing modules. Any particular installation may comprise one or more modules. It is preferred to utilise wall sections that are 3m high for UHF antenna and 1.1m high for SHF antenna.
  • the panels making up the wall sections are preferably the full height of the wall sections, e.g. 3m or 1.1m respectively, and are preferably made in widths equal to 1/6 th or 1/12 th of the antenna housing circumference.
  • the housing can be constructed to accept either a single or double tier of UHF antenna by using either one or two 3m high wall sections.
  • an opaque removable panel is fitted either above or below (or centrally between) the main 3m UHF panel or panels.
  • the panel is removeable during installation of the antennae thus allowing the UHF antenna within each 30° wall section to be accurately aligned to known landmarks.
  • the panel is manufactured from therrmoformed plastic with a curvature and finish to match the housing, it is conveniently secured with circumferential bolts, and a gasket provides suitable weatherproofing.
  • an SHF link antenna When an SHF link antenna is required it transmits through the same aperture as the sighting window but the removable panel has a flat rather than curved front face.
  • the front can also be supplied angled from 0° to 15° in increments of 5° to suit the required antenna alignment.
  • the window for the SHF antenna is manufactured specifically from PVC-UE, or any other material that exhibits very low attenuation amongst its properties. Due to PVC-UE having a higher coefficient of thermal expansion compared to reinforce plastic provision has to be made for expansion that would cause the flat face of the 'window' to distort. This is achieved by vacuum forming a "top hat section. This allows the face of the window to expand without deflection. These removable panels are fitted into a separate section of wall 1.1m high thus allowing it to arranged within the vertical height of the housing as required.
  • PVC-UE for the removable panel / window
  • PTFE clear PTFE.
  • This has the required low loss requirements for the SHF link and would not need to be removed for sighting the UHF antenna.
  • the window being translucent the aesthetics may be impaired. Maintenance lighting within the housing will also be seen when in use.
  • the wall sections may comprise of individual panels of either moulded reinforced plastic with or without a foam/honeycomb core, solid PVC-UE or PTFE.
  • the panels are thermoformed to suit the housing and painted to match the main structure, alternatively in the case of other PTFE based materials the panel may be left translucent.
  • the wall sections comprise a composite section of moulded reinforced plastics with or without a PVC foam and/or honeycomb core.
  • the reinforced plastics may be sheet or laminate and may be comprised of glass fibre strand, mat, PTFE, or any other low attenuation material.
  • the preferred panels have a flange formed around their edges from, e.g. glass reinforced plastics, to provide both a means of securing the individual panels to each other to form the completed structure and to provide structural integrity to the housing.
  • the panels are secured together by bonding.
  • a gutter is formed on the bottom flange of each section to allow the collection of condensation.
  • the condensate is released to the exterior of the housing through a drain hole.
  • the outer surface has a leather grain gel coat applied during the moulding process and colour matched to suit the main structure.
  • a reinforced plastic with a foam/honeycomb core is that the material has a much lower U value than solid reinforced plastic, which reduces thermal pickup and minimises condensation.
  • Using two thin glass fibre layers (2x1mm) and very low loss foam core gives low attenuation losses and yet gives high strength and good rigidity.
  • Such a structure is ideal for the walls shielding the UHF antenna.
  • Thicker glass reinforced plastics is conveniently used for wall sections behind which the SHF antenna are situated, with apertures cut therein to accommodate the very low loss windows.
  • each panel that is used to form the antenna housing has a vertical height sufficient to accommodate one UHF antenna and one SHF antenna. I.e. 4.1m based on the above example. That part of the panel that will shield the UHF antenna is formed from the aforesaid sandwich comprising a core of foam plastics sandwiched between two layers of glass reinforced plastics (grp), whilst the part where the SHF antenna will be located comprises a thicker section of glass reinforced plastics. A material known as forex may be used for the foam core.
  • Each panel has a peripheral flange of grp extending inwardly from the peripheral surface of the panel. The panel is moulded with a curvature to match that of the outer periphery of the silo.
  • Standard diameters of 3.5m and 4.2m are preferred to facilitate transport to site by road already built up into cylindrical sections.
  • the UHF and SHF sections of the panel are disposed one above the other.
  • the panels can be installed either end up, i.e. with the UHF section uppermost or lowermost. Adjacent panels may be assembled in the same or alternative orientations according to the desired antenna installation pattern.
  • Another aspect of the invention provides a storage silo incorporating an antenna housing as aforedescribed.
  • the silo preferably comprises a storage compartment and means for charging and discharging material therefrom.
  • the silo is not necessarily an animal feed silo.
  • a yet further aspect of the invention provides apparatus in the form of a storage silo comprising an antenna housing having at least in part low attenuation walls comprising glass reinforced plastics with a foam core.
  • the silo with its legs and the equipment housing are transported to the intended installation site in one prefabricated unit, and the antenna housing, usually with its roof, is transported to site in another prefabricated unit. Once on site the antenna housing is fitted to the top of the equipment housing before the whole assembly is lifted into the desired position using a crane.
  • the storage compartment for the silo comprises a hollow cylindrical structure having a double skin roof which also serves as the floor for the equipment housing.
  • the centre of the double skin ceiling/floor structure is provided with a lifting lug by which the unit is lifted into position.
  • the equipment housing preferably has its walls formed from plastic coated galvanised steel sheet secured to a plurality of vertical ribs. The walls may be single or twin skinned , with or without insulation according to design requirements.
  • the equipment housing has a ceiling structure formed by a plurality of radial ribs that extend inwardly from the vertical ribs of the external walls. The ceiling functions as the floor for the antenna housing and is apertured to allow access into the antenna housing. A central aperture with a removable cover allows a lifting line to pass through and connect with the lifting lug.
  • the wall sections are mountable at any desired circumferential position around the central vertical core of the structure (and likewise the antenna are mountable at any desired circumferential position) in increments of 1° enable individual antennas disposed within the housing to be accurately aligned on a desired bearing.
  • each antenna mounted within the housing has provision for a removable viewing panel to allow each individual UHF antenna to be accurately aligned during installation to known landmarks for example via an optical device fitted to each individual antenna.
  • the wall sections of the antenna housing are mounted to a support structure comprising a plurality of substantially vertical ribs extending between a support structure therefor.
  • the wall sections comprise a plurality of vertical panel members made from low attenuation material and located along their opposite vertical edges by the ribs.
  • the vertical ribs may be manufactured from either extruded, moulded or otherwise fabricated aluminium, PVC or reinforced plastic.
  • the support structure further comprises two spaced circumferential hoops and the ribs extend between the hoops.
  • the preferred material for the panels is foamed PVC.
  • a panel thickness of 10mm when made of foamed PVC has been found to provide a suitably low attenuation. Typically of the order of 0.5-1dB at frequencies up to 2.2GHz.
  • the desired propagation angle of the UHF antenna arrays can be accommodated with up to 12 ribs.
  • the preferred housing also incorporates the necessary telecommunications equipment in an equipment module that can be disposed immediately below the antenna housing in an equipment housing. It is particularly advantageous if the antenna housing and the equipment housing are incorporated in a working storage silo. Usually the antenna housing will form the upper part of the structure and the equipment housing a portion of the structure immediately below the antenna housing.
  • the construction of the storage silo can follow that which is common for storage silos.
  • a modular construction is used comprising a silo base with a storage silo compartment, an equipment housing and the antenna housing. Each module is preferably pre-fabricated off site and the modules assembled on site.
  • the present invention relates to an antenna housing designed to suit the installation of one or both of UHF and SHF antenna and configured to resemble a storage silo.
  • the storage silo may be a working silo, a dummy silo, a tower or similar structure.
  • the present invention is described hereinafter, by way of example, in relation to its incorporation in to a working silo.
  • a first embodiment of storage silo 1 is illustrated and comprises a base framework comprising six circumferentially spaced uprights 31 connected by horizontal stringers 33 with diagonal braces 35.
  • the uprights connect with a hip ring 36.
  • the uprights are provided with feet for mounting on a concrete plinth 37.
  • the base framework is superposed by a cylindrical storage silo 19 formed by a plurality of pressed galvanised steel sheets 20 that are bolted or riveted together to form a load bearing structure.
  • the sheets are connected to the hip ring 36.
  • the storage silo has a 60° or 67° cone 16 to its base and is provided with the usual equipment to allow it to function as a storage silo including an access panel 14, filler pipe 17, ventilation pipe 10 and outlet valve control, etc. which are common in the art and not described in any further detail.
  • An equipment housing 2 is disposed above the storage silo 19 and is defined between hoops 41, 43 which define floors for the equipment housing and for an antenna housing 3 thereabove.
  • the construction of the equipment housing follows similar lines to the silo construction.
  • Its outer wall comprises a plurality of pressed galvanised steel sheets secured to vertical ribs.
  • the floor is of double skin construction and comprises a plurality of radial ribs extending from the hoop 41 and in a preferred embodiment these connect to a central ring (not illustrated).
  • the floor is of galvanised steel sheets.
  • a removable cover plate affords access to the lifting lug when required for on site erection of the silo.
  • the equipment housing has an access door 57 in a side wall thereof and typically incorporates electronics for the telecommunications equipment as well as air conditioning plant as described further hereinafter.
  • Access to the equipment housing is by way of an external access ladder 11.
  • the floor of the equipment housing is supported by the walls of the storage silo and also forms the roof for the storage silo.
  • Upper hoop 43 supports a plurality of radial ribs that provide the floor for the antenna housing3 that is surmounted on top of the equipment housing.
  • the floor is apertured to allow access to the antenna housing and to provide for air circulation between the antenna housing and the equipment housing.
  • intermediate access decking platforms 46 may be provided as described and illustrated in further detail with reference to figures 3 and 5.
  • the antenna housing 3 is described in further detail hereinafter.
  • a reinforcing bar may be disposed between the adjacent panels.
  • the bar may be made of plastics, steel or aluminium.
  • a gutter 51 is formed on the bottom flange of each section to allow the collection of condensation. The condensate is released to the exterior of the housing through a drain hole.
  • the outer surface has a leather grain gel coat applied during the moulding process and colour matched to suit the main structure of the silo.
  • a further benefit of using a reinforced plastic with a foam/honeycomb core is that the material has a much lower U value than solid reinforced plastic, which reduces thermal pickup and minimises condensation.
  • the intermediate access decking 46 comprises a plurality of five sided deck elements 48 (six in the illustrated embodiment) - see figures 3 and 5 - which depend from the internal steel lattice. Brackets 50 extend radially outwardly and provide mounting points to which the wall sections 41 are secured -see figures 2 and 3.
  • the deck elements define a central aperture 52 that accommodates an access ladder 54.
  • the ladder is attached to a mounting ring 56 at its upper end which in turn attaches to an upper antenna ring support channel 58.
  • the decking elements and/or the brackets can be mounted at any desired circumferential position with respect to the internal structure.
  • the antenna housing comprises a first module that is configured to accommodate a single tier of UHF antenna.
  • Two UHF antenna are shown at 61.
  • the antenna 61 are attached to a respective antenna mounting pole 67 which is itself attached to the structure by a circular mounting ring 62.
  • the ring allows the poles/antenna to be mounted at any desired cicumferential angular position.
  • Each wall section is 3m high and in the illustrated embodiment has a periphery equal to 1/12 of the circumference of the housing.
  • the housing can be constructed to accept a double tier of UHF antenna by using two 3m high wall sections secured on top of one another as illustrated in the embodiment shown in figure 7.
  • Each wall section can be removed individually if so required for access to the antenna or for sighting purposes on installation. However, it is preferred to provide a separate viewing window in an additional circumferential housing module as seen at 4 in figures 1, 2 and 7.
  • the housing module 4 may be fitted either above or below (or centrally between) the main antenna module comprising the 3m UHF panel or panels. In the illustrations it is above the UHF panel sections.
  • the separate section of wall is 1.1m high. It is formed from panels 41' that are made from 5-6mm GRP and each panel accommodates a window 67.
  • the window is conveniently formed as a removable element in a panel forming the separate housing part. Each window is preferably opaque.
  • the window is removed during installation of the antennae thus allowing the UHF antenna within each 30° wall section to be accurately aligned to known landmarks.
  • the window is manufactured from themoformed plastic with a curvature and finish to match the housing. It is secured with circumferential bolts, and a gasket provides suitable weatherproofing.
  • an SHF link antenna 61 When an SHF link antenna 61 is required (as illustrated in figures 2 and 7) it transmits through the same aperture as the sighting window but the removable panel has a flat face (see 67' in figure 3) rather than a curved front face.
  • the front can also be supplied angled from 0° to 15° in increments of 5° to suit the required antenna alignment - see for example 67" in figure 3.
  • the window for the SHF antenna is manufactured specifically from PVC-UE, or any other material that exhibits very low attenuation amongst its properties. Due to PVC-UE having a higher coefficient of thermal expansion compared to reinforce plastic provision has to be made for expansion that would cause the flat face of the 'window' to distort. This is achieved by vacuum forming a "top hat section. This allows the face of the window to expand without deflection.
  • PVC-UE is extruded UV stabilized PVC sheet that has been foamed or expanded to increase air content and reduce the PVC content. Alternatively
  • the SHF antenna are located in a corresponding manner to the UHF antenna. Respective upper and lower mounting rings 62' are provided. A mounting pole 63' is secured between the rings and the SHF antenna 66 is attached to the pole.
  • the mounting arrangement allows the SHF antenna to be mounted in any desired angular position. Two possibilities are shown in Figure 3.
  • a lifting point is provided at 90 attached to the internal structure for lifting the modules into position.
  • the moulded roof structure 92 comprising, for example, three Moulded GRP panels that are bolted together and secured to the internal structure.
  • a roof ventilator is shown at 95 and a roof ventilator actuator at 94.
  • An upper antenna ring coupling plate is shown at 95.
  • Figure 6 illustrates how the field of view of the UHF antenna 61 passes unimpeded between the joints of the wall panels 41. Two UHF antenna are shown in the illustrated embodiment.
  • Figure 7 illustrates another embodiment in which two UHF antenna modules 3 are provided to accommodate two tiers of UHF antenna 61.
  • the two UHF modules 3 are superposed by the module 4 accommodating the viewing windows and any SHF antenna.
  • Corresponding numbers have been used to denote identical parts described heretofore and are not described further.
  • the internal structure for each module is bolted to the next to form the desired size of antenna module.
  • the embodiment of figure 7 includes an equipment housing 2 and a working storage silo as described in relation to the embodiment of figure 1.
  • Lightening protection is provided for the structure and a lightening conductor is shown at 100 in figures 1, 2 and 7.
  • the base structure up to the hip ring 36 is formed as one pre-fabricated module and the antenna housing parts 3,4 and roof 5 are formed as a second pre-fabricated module.
  • the panels forming the walls of the storage silo may be pre-fabricated in conjunction with either the base module or the equipment housing, but more preferably they are transported as flat sheet and erected on site.
  • the detailed construction of the silo will depend on whether it is a working or dummy silo. If the former, explosion protection provisions will usually be incorporated. Usually this will dictate a separate roof structure for the silo or reinforcement of the equipment housing floor as well as the provision of side explosion panels in the silo.
  • the base and storage silo are constructed as aforedescribed and likewise the equipment housing and its floor.
  • the floor of the antenna housing comprises a plurality of radial ribs extending from hoop 43 and connected to a central ring.
  • the floor is apertured as aforesaid to permit access from the equipment housing and for air circulation purposes.
  • the floor also provides a mounting surface for a head frame to which the antennas are mounted, directly or indirectly.
  • a preferred head frame is hexagonal and its angular position is adjustable with respect to the floor.
  • the floor has a plurality of mounting holes disposed on a common pitch circle diameter that can be aligned with holes in the base of the head frame to allow angular adjustment in say 1 0 increments.
  • one of the six faces of the head frame is set to be normal to grid North.
  • the silo may be positioned to achieve the desired alignment without having to adjust the head frame separately.
  • a preferred antenna housing comprises 6 or 12 wall sections that are of a height to accommodate both a UHF antenna and a SHF antenna and for the head frame to have a corresponding height. This avoids the need for a separate SHF antenna module and also means that the intermediate access deck shown in the embodiment of figure 2 can be omitted.
  • Each panel of the wall section thus comprises a low attenuation part (say approximately 3m thereof) formed by the foresaid two layers of grp sandwiching a foam core, whilst the other part (say 1.1m thereof) comprises a thicker grp section of the order of say 5m thick without the foam core. Where viewing windows or SHF antenna are required, apertures are cut into this part to accommodate the viewing window or the low attenuation window as the case may be in a manner substantially as previously described.
  • the panels can be orientated to have the UHF antennas all positioned on the same level, or to have them positioned at different levels so that the SHF antenna are positioned either uppermost or lowermost.
  • the silo construction described above has centred around the formation of the walls using pressed steel sheets which in themselves do not have a sufficiently low attenuation to accommodate either UHF or SHF antennas. Hence the need to introduce the low attenuation section made of the aforesaid grp with foam core.
  • silo that is in use utilises a one piece cylindrical tower structure with the walls formed of glass reinforced plastics. Often these are formed using a rotational moulding technique. However wall thicknesses are such that they have a high attenuation factor and therefore the existing designs are not suitable to accommodate antennas. However, another aspect of the invention proposes reducing the wall thickness in specific regions to reduce the attenuation to an acceptable level.

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  • Details Of Aerials (AREA)
EP02259032A 2002-01-04 2002-12-31 Boitier d'antenne Withdrawn EP1326301A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0200190 2002-01-04
GB0200190A GB0200190D0 (en) 2002-01-04 2002-01-04 Antenna housing

Publications (1)

Publication Number Publication Date
EP1326301A1 true EP1326301A1 (fr) 2003-07-09

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ID=9928651

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02259032A Withdrawn EP1326301A1 (fr) 2002-01-04 2002-12-31 Boitier d'antenne

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EP (1) EP1326301A1 (fr)
GB (2) GB0200190D0 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111755796A (zh) * 2019-03-28 2020-10-09 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） 基于金属材质公路设施的短波天线装置及实现方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2417833A (en) * 2004-09-07 2006-03-08 Europ Satellites Ltd Antenna cover

Citations (7)

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Publication number Priority date Publication date Assignee Title
US2956280A (en) * 1959-02-27 1960-10-11 John M O'keefe Ball and socket antenna mounting
DE1273023B (de) * 1965-10-09 1968-07-18 Gruenzweig & Hartmann Verfahren zur Herstellung eines aus Hartschaumstoff bestehenden selbsttragenden turmartigen Gehaeuses zum Schutz funktechnischer Anlagen
DE2308297A1 (de) * 1973-02-17 1974-08-22 Licentia Gmbh Wetterschutzverkleidung fuer antennenfelder aus einzelzylindern
US5852424A (en) * 1997-05-20 1998-12-22 Stealth Network Technologies Inc. Building elements and support structure for enclosing an antenna
DE29816114U1 (de) * 1998-09-08 1998-12-24 Telecommunikation Services Gmb Abdeckung für Richtfunkantennen
DE19902511A1 (de) * 1999-01-22 2000-08-17 Telecommunikation Services Gmb Verkleidungen für Richtfunkantennen
EP1286412A2 (fr) * 2001-08-13 2003-02-26 Ulrich Carthäuser Mât d'antenne

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GB2215137A (en) * 1988-02-12 1989-09-13 Geospace Designs Ltd Antenna screen
WO1998016968A1 (fr) * 1996-10-16 1998-04-23 Stealth Network Technologies, Inc. Elements de construction et structure de support permettant d'entourer une antenne
WO1998053522A1 (fr) * 1997-05-20 1998-11-26 Stealth Network Technologies, Inc. Gaine et structure support pour envelopper une antenne montee sur un element allonge
GB2333645B (en) * 1998-06-12 2000-03-22 Vodafone Ltd Radio signal transmitting and/or receiving arrangements
JP2001126471A (ja) * 1999-10-27 2001-05-11 Mitsubishi Electric Corp 半導体集積回路
ES2160539B1 (es) * 2000-02-10 2003-04-01 Jimenez Belinchon S A Disposicion de camuflaje aplicable sobre torres soporte de antenas de tecelomunicaciones o similares.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2956280A (en) * 1959-02-27 1960-10-11 John M O'keefe Ball and socket antenna mounting
DE1273023B (de) * 1965-10-09 1968-07-18 Gruenzweig & Hartmann Verfahren zur Herstellung eines aus Hartschaumstoff bestehenden selbsttragenden turmartigen Gehaeuses zum Schutz funktechnischer Anlagen
DE2308297A1 (de) * 1973-02-17 1974-08-22 Licentia Gmbh Wetterschutzverkleidung fuer antennenfelder aus einzelzylindern
US5852424A (en) * 1997-05-20 1998-12-22 Stealth Network Technologies Inc. Building elements and support structure for enclosing an antenna
DE29816114U1 (de) * 1998-09-08 1998-12-24 Telecommunikation Services Gmb Abdeckung für Richtfunkantennen
DE19902511A1 (de) * 1999-01-22 2000-08-17 Telecommunikation Services Gmb Verkleidungen für Richtfunkantennen
EP1286412A2 (fr) * 2001-08-13 2003-02-26 Ulrich Carthäuser Mât d'antenne

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111755796A (zh) * 2019-03-28 2020-10-09 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） 基于金属材质公路设施的短波天线装置及实现方法

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Publication number Publication date
GB0200190D0 (en) 2002-02-20
GB2384118A (en) 2003-07-16
GB0230322D0 (en) 2003-02-05

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