EP0595418A1 - Reflecting parabolic antenna for e.m. wave reception and related manufacturing method - Google Patents

Reflecting parabolic antenna for e.m. wave reception and related manufacturing method Download PDF

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Publication number
EP0595418A1
EP0595418A1 EP93202974A EP93202974A EP0595418A1 EP 0595418 A1 EP0595418 A1 EP 0595418A1 EP 93202974 A EP93202974 A EP 93202974A EP 93202974 A EP93202974 A EP 93202974A EP 0595418 A1 EP0595418 A1 EP 0595418A1
Authority
EP
European Patent Office
Prior art keywords
net
plastic
mold
antenna
reflecting
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Withdrawn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
EP93202974A
Other languages
German (de)
French (fr)
Inventor
Remo Grossi
Vito Minguzzi
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.)
Di Ws Plastic Srl
Original Assignee
Di Ws Plastic Srl
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
Priority to ITMI922471 priority Critical patent/IT1255930B/en
Priority to ITMI922471 priority
Application filed by Di Ws Plastic Srl filed Critical Di Ws Plastic Srl
Publication of EP0595418A1 publication Critical patent/EP0595418A1/en
Withdrawn legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14Reflecting surfaces; Equivalent structures
    • H01Q15/141Apparatus or processes specially adapted for manufacturing reflecting surfaces
    • H01Q15/142Apparatus or processes specially adapted for manufacturing reflecting surfaces using insulating material for supporting the reflecting surface
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14Reflecting surfaces; Equivalent structures
    • H01Q15/16Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
    • H01Q15/168Mesh reflectors mounted on a non-collapsible frame

Abstract

Parabolic reflecting antenna and related manufacturing method, said antenna comprising a plastic material body (1) obtained by injection molding and encasing a net (4) of electrically conductive material having the joint function of electromagnetic reflector and stiffening framing for the body.

Description

  • The present invention relates to a reflecting parabolic antenna for receiving high frequency e.m. waves such as those used in satellite communication and having a stiff mechanical structure, weather resistant, simple to install and at the same time unexpensive and series producible with manufacturing methods which assure repeatability of characteristics and product quality.
  • The antenna of the present invenzion comprises an injection mold plastic body encasing an electrically conductive net structure performing both the e.m. radiation antenna reflecting function and the plastic body mechanical stiffening.
  • As known plastic material are not conductive and result transparent to the electro magnetic waves.
  • Therefore e.m. radiation reflecting antennas are generally made with metal sheet mechanical structures suitably shaped and reinforced, or even by a plastic material mechanical structure which must be coated with metal based paints or with metallic sheets or fabrics subsequently applied to a suitably shaped plastic support.
  • Mold formed antennas, obtained with more handicraft than industrial processes are also known.
  • The process consists in the laying of a first protective coating of thermosetting resin or "gel coat" on a mold surface, in the laying down of a second layer of thermosetting fluid material having good resiliency, in the laying down of a conductive net on the resilient layer and in superposing them a thermoforming plastic sheet so that by closing and heating the mold a composite laminated structure having the desired form is obtained.
  • This process is described for instance in US-A-4,648,329.
  • Other methods consist in the pressure thermoforming on suitable molds of laminated compounds comprising at least a conductive layer and a layer of thermoforming plastic material.
  • In the prior art antennas several problems are encountered: generally expensive treatment are required for protecting the metal structure from weather agents, mostly acting on the structure by chemical way.
  • When the mechanical structure is made in plastic, stiffening ribs and adequate protection are needed to provide the required stiffness and resistance to the weather agents (which in this case act mostly by mechanical and physical way) at the detriment of the product economy.
  • Even the embodiments using composite materials, mold formed or prelaminated and then mold thermoformed, are obtained with very elaborate and expensive manufacturing processes and therefore are quite expensive.
  • These problem and disadvantages are overcome by the reflecting antenna which is the object of the present invention and by the related manufacturing method which leads to an antenna formed by a plastic body obtained by injection molding and encasing a conductive material net.
  • The plastic body obtained by injection molding performs a protective action of the reflecting structure in conductive material encased therein and further provides a relatively resilient mechanical support to the reflecting structure, overcoming the need of particular protective treatments.
  • The conductive material net encased therein may be made with mechanically stiff materials providing to the plastic body some kind of framing, hence adequate stiffness and moreover resistance to the weather agents which acts in mechanical and physical way (wind, thermal stresses, UV radiation and so on.
  • The features and the advantages of the present invention will appear more clearly from the following description of a preferred form of embodiment and from the enclosed drawings where:
    • figure 1 is a rear view of a reflecting antenna in accordance with the present invention,
    • figure 2 is a schematic lateral section view of a reflecting antenna in accordance with the present invention,
    • figures 3,4,5 shows, in enlarged view, a detail of the figure 2 section.
  • Referring to figure 2 the reflecting antenna comprises a reflecting parabolic element 1 and a receiving element 2 located at the focus of the parabolic element.
  • The receiving element is commonly named as "illuminator".
  • The illuminator 2 is removably and rigidly connected to the reflector 1 by means of an arm 3.
  • The reflector is formed by a plastic material body, obtained by thermoplastic resins injection molding, such as for instance ABS, PVC, polyesther and so on, possibly including reinforcing fillers such as fiber glass, carbon fiber or even mineral fillers and protective additives.
  • As better shown in figure 3,4,5 showing in enlarged view a portion of reflector 1 (identified by the numeral 6A of figure 2) a net 4 in conductive material, such as steel, iron, brass, bronze, is encased in the plastic material body.
  • The net 4 may be obtained from interweaved or welded wires, with or without surface protection against oxidation, which protection is, in large measure, rendered superfluous by the protection provided by the encasing plastic body.
  • The net 4 may also be formed in fiberglass or carbon fiber, metallized by suitable processes (sputtering - vacuum metallization electrochemical deposition).
  • A composite structure as the one described is obtained with the following process.
  • The metallic net 4 is blanked and cut in the desired shape and preformed according to the parabolic profile required by the antenna.
  • Then it is inserted in a mold having a predetermined shape, corresponding to the one of the antenna. The net is held in the desired position by means of reference clamping posts.
  • Once the mold is closed, an injection press provides to inject the thermoplastic material into the mold, encasing the net 4 in a plastic body.
  • A fundamental problem in this process is the precise positioning and clamping of the conductive net in the mold, the net forming the reflective element.
  • In fact the injection of the plastic material may cause displacement of the net, the displacement modifying the profile and reducing the reflector efficiency.
  • Therefore, according to a further aspect of the present invention the net 4 is formed from ferromagnetic material (iron/steel) and the manufacturing process is conducted in amagnetic material molds having suitable electromagnets in one of the two mold, or even having steady or removable permanent magnets.
  • In this way, the net 4 may be positioned in the mold and clamped therein by means of magnetic forces.
  • Figures 3 and 5 show for instance the arrangement of the reflecting net 4, encased in the plastic due to magnetic attractive forces exerted, during the forming process, in the direction of the one or the other of the mold surfaces.
  • Figure 4 shows the case in which the net is positioned by clamping posts, resulting in corresponding impressions 6 of the plastic body.
  • It is clear that in the same forming and reflector encasing process, male or female couplings can be obtained with the same molding operation, such as a recess 5 for fixing an illuminator supporting arm 3 to the reflecting element or such as a seat 7 for fixing the antenna set to a steady or revolving support.
  • Stiffening ribs can be easily obtained in the same way.
  • Therefore the injection molding forming process allows to obtain in simple and repeatitive way parabolic reflectors having low cost, high quality, high antenna electric efficiency and at the same time the structural elements providing the removable coupling with the illuminator, so that the antenna set is easily transportable and installable.

Claims (5)

  1. Reflecting antenna for receiving electromagnetic waves characterised in that comprises a plastic material body (1) formed by injection molding and an electrically conductive net (4) encased in said plastic material (1).
  2. Reflecting antenna according to claim 1, where said body (1) comprises a coupling, integral to said body (1) for removably hooking an illuminator supporting arm (3), and means (7) integral to said body (1) for fixing to an antenna support.
  3. Method for manufacturing reflecting antennas for receiving electromagnetic waves characterized by the following orderly steps:
    - blanking and preforming of an electrically conductive net,
    - insertion of said electrically conductive net in a plastic material injection mold,
    - clamping of said net in said mold, by positioning means,
    - injection in said mold of plastic material englobing said set.
  4. Method according to claim 3 where said performed net being in ferromagnetic material, said clamping is performed by electromagnetic means provided in said mold.
  5. Method according to claim, 3 where said preformed net being in ferromagnetic material, said clamping is performed by magnetic means provided in said mold.
EP93202974A 1992-10-28 1993-10-23 Reflecting parabolic antenna for e.m. wave reception and related manufacturing method Withdrawn EP0595418A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ITMI922471 IT1255930B (en) 1992-10-28 1992-10-28 reflective parabolic antenna for the reception of electromagnetic waves and their manufacturing method.
ITMI922471 1992-10-28

Publications (1)

Publication Number Publication Date
EP0595418A1 true EP0595418A1 (en) 1994-05-04

Family

ID=11364187

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93202974A Withdrawn EP0595418A1 (en) 1992-10-28 1993-10-23 Reflecting parabolic antenna for e.m. wave reception and related manufacturing method

Country Status (6)

Country Link
EP (1) EP0595418A1 (en)
CZ (1) CZ225693A3 (en)
HU (1) HUT65389A (en)
IT (1) IT1255930B (en)
PL (1) PL300877A1 (en)
SK (1) SK119293A3 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2784804A1 (en) * 1998-10-16 2000-04-21 Soc D Transformation Ind De Ma Antenna reflector for satellite receiving installation, includes conductive wire embedded in surface of concave thermoplastic material
FR2808382A1 (en) * 2000-04-28 2001-11-02 Vector Ind France Parabolic antenna and manufacturing method thereof
DE10118866A1 (en) * 2001-04-18 2002-10-24 Swoboda Gmbh Geb Radar antenna with metal foil coating is made by separate injection molding of plastic part and electroforming of metal foil and joining them with adhesive
GB2386760A (en) * 2002-03-19 2003-09-24 Sharp Kk Converter structure for use in universal LNB
US20110221101A1 (en) * 2010-03-10 2011-09-15 Legare David J Resin-based molding of electrically conductive structures
CN102496774A (en) * 2011-11-30 2012-06-13 中国电子科技集团公司第五十四研究所 Design method of shaped double-offset Gregory antenna with high gain and low side lobe
US9685710B1 (en) 2014-01-22 2017-06-20 Space Systems/Loral, Llc Reflective and permeable metalized laminate

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3395209A (en) * 1965-09-30 1968-07-30 Ronan & Kunzl Inc Method of molding electric switch plates in mat bodies
US3607569A (en) * 1969-03-24 1971-09-21 Joseph L Greenwell Magnetic mold means for molding steel-reinforced hollow bodies
JPS6290003A (en) * 1985-10-15 1987-04-24 Sekisui Chem Co Ltd Manufacture of reflection mirror for parabolic antenna
DE9001255U1 (en) * 1990-02-03 1990-04-05 Hagenbusch, Guenther, 7313 Reichenbach, De
DE3911445A1 (en) * 1989-04-07 1990-10-11 Ring Hans Georg Hollow mirror for focusing incident electromagnet waves
JPH0315509A (en) * 1989-06-14 1991-01-23 Kasai Kogyo Co Ltd Manufacture of core material for interior of automobile

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3395209A (en) * 1965-09-30 1968-07-30 Ronan & Kunzl Inc Method of molding electric switch plates in mat bodies
US3607569A (en) * 1969-03-24 1971-09-21 Joseph L Greenwell Magnetic mold means for molding steel-reinforced hollow bodies
JPS6290003A (en) * 1985-10-15 1987-04-24 Sekisui Chem Co Ltd Manufacture of reflection mirror for parabolic antenna
DE3911445A1 (en) * 1989-04-07 1990-10-11 Ring Hans Georg Hollow mirror for focusing incident electromagnet waves
JPH0315509A (en) * 1989-06-14 1991-01-23 Kasai Kogyo Co Ltd Manufacture of core material for interior of automobile
DE9001255U1 (en) * 1990-02-03 1990-04-05 Hagenbusch, Guenther, 7313 Reichenbach, De

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 011, no. 292 (E - 543) 19 September 1987 (1987-09-19) *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 129 (M - 1098) 28 March 1991 (1991-03-28) *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6486854B1 (en) 1998-10-16 2002-11-26 Societe De Transformation Industrielle Electromagnetic wave reflector and method for making same
WO2000024086A1 (en) * 1998-10-16 2000-04-27 Societe De Transformation Industrielle De Matieres Plastiques - Stimap Electromagnetic wave reflector and method for making same
EP1143561A1 (en) * 1998-10-16 2001-10-10 Société de Transformation Industrielle de Matieres Plastiques- STIMAP Electromagnetic wave reflector and associated manufactoring method
FR2784804A1 (en) * 1998-10-16 2000-04-21 Soc D Transformation Ind De Ma Antenna reflector for satellite receiving installation, includes conductive wire embedded in surface of concave thermoplastic material
WO2001084671A1 (en) * 2000-04-28 2001-11-08 Vector Industries France Parabolic antenna and method for making same
FR2808382A1 (en) * 2000-04-28 2001-11-02 Vector Ind France Parabolic antenna and manufacturing method thereof
DE10118866A1 (en) * 2001-04-18 2002-10-24 Swoboda Gmbh Geb Radar antenna with metal foil coating is made by separate injection molding of plastic part and electroforming of metal foil and joining them with adhesive
GB2386760A (en) * 2002-03-19 2003-09-24 Sharp Kk Converter structure for use in universal LNB
GB2386760B (en) * 2002-03-19 2005-08-10 Sharp Kk Converter structure for use in universal LNB
US20110221101A1 (en) * 2010-03-10 2011-09-15 Legare David J Resin-based molding of electrically conductive structures
CN102496774A (en) * 2011-11-30 2012-06-13 中国电子科技集团公司第五十四研究所 Design method of shaped double-offset Gregory antenna with high gain and low side lobe
CN102496774B (en) * 2011-11-30 2013-10-23 中国电子科技集团公司第五十四研究所 Design method of shaped double-offset Gregory antenna with high gain and low side lobe
US9685710B1 (en) 2014-01-22 2017-06-20 Space Systems/Loral, Llc Reflective and permeable metalized laminate

Also Published As

Publication number Publication date
HU9303050D0 (en) 1994-01-28
ITMI922471D0 (en) 1992-10-28
SK119293A3 (en) 1994-06-08
IT1255930B (en) 1995-11-17
CZ225693A3 (en) 1994-05-18
HUT65389A (en) 1994-06-28
ITMI922471A1 (en) 1994-04-29
PL300877A1 (en) 1994-05-16

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