EP0632522B1 - Dielectric lens for an antenna and manufacturing process thereof - Google Patents
Dielectric lens for an antenna and manufacturing process thereof Download PDFInfo
- Publication number
- EP0632522B1 EP0632522B1 EP94110099A EP94110099A EP0632522B1 EP 0632522 B1 EP0632522 B1 EP 0632522B1 EP 94110099 A EP94110099 A EP 94110099A EP 94110099 A EP94110099 A EP 94110099A EP 0632522 B1 EP0632522 B1 EP 0632522B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radome
- dielectric lens
- antenna
- dome
- dielectric
- 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.)
- Expired - Lifetime
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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
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/02—Refracting or diffracting devices, e.g. lens, prism
- H01Q15/08—Refracting or diffracting devices, e.g. lens, prism formed of solid dielectric material
Definitions
- the present invention relates to a dielectric lens, and more particularly to a dielectric lens used as an element of an antenna for receiving microwave for communication and broadcasting.
- a dielectric lens used as an element of an antenna for receiving microwave of 5GHz or more is conventionally produced by: mixing a resin, for example, polypropylene, polyethylene, polystyrene or the like, with ceramic powder, which acts as a foaming agent and as a dielectric constant conditioner; and molding the mixture into a dome.
- a resin for example, polypropylene, polyethylene, polystyrene or the like
- ceramic powder which acts as a foaming agent and as a dielectric constant conditioner
- the dielectric lens is molded to be thick and accordingly to be heavy. For example, if a mixture of polypropylene and ceramic powder is molded into a dome which is about 180mm in diameter and about 76mm in height, the weight will be about 1kg. Thus, a large quantity of resin is necessary, and the cost of the dielectric lens is high.
- the thickly molded dielectric lens is likely to have a defect such as a sink mark and a swirl mark on the surface (radome layer) and a void inside.
- the defect can be fairly avoided by adopting injection compression molding.
- the injection compression molding requires a mold of a complicated structure and expensive facilities. Even in the injection compression molding, it is difficult to completely prevent occurrence of a sink mark, a swirl mark and a void. Further, a product by the injection compression molding has residual stress, which is a cause of deflection.
- WO 93/10572 relates to a dielectric material for antennas which is composed of individual pieces which appear essentially homogenous to signals whose frequency is such that their wavelength is greater than the dimension of the pieces.
- the dielectric material comprises some dielectrical pieces which collectively form a dielectic block which itself has the shape of a dielectric antenna to be produced.
- the pieces may be fixed to each other, for example by glueing, or may just lay near or on each other.
- a microwave length antenna comprises a radome cover which may also serve as a matching layer to reduce the amount of reflected signal at the lens surface.
- the radome cover is made of plastic and may be used as a vessel to contain the unbound plastic pieces.
- WO 89/08932 relates to a solid dielectric lens aerial comprising a lens of dielectric material transparent to radiation.
- the material for the solid dielectric lens aerial may be silica glass beads or silica flour which is bound together.
- the lens may comprise a shell formed of two halves and filled with the powder.
- the radome and the foamy body are molded separately, and the produced lens is less likely to have a sink mark, a swirl mark and/or a void compared with a conventional dielectric lens produced by integral molding. Also, since preexpanded beads are used for the foamy body, only a small quantity of resin is necessary, thereby lessening the weight.
- the radome is formed by ordinary thinwall injection molding, and the foamy body is formed by ordinary foaming. Therefore, such expensive facilities as to be used for injection compression molding are not required, and the cost for facilities is low.
- a dielectric lens according to the present invention and a manufacturing process thereof are hereinafter described with reference to the accompanying drawings.
- numeral 1 denotes a radome
- numeral 5 denotes a lid
- numeral 10 denotes a foamy body.
- the radome 1 is molded as a dome shell of a specified size.
- the foamy body 10 has a curved surface which is identical with the inner surface of the radome 1 such that the foamy body 10 will be mounted in the radome 1 with no space in-between.
- the foamy body 10 is produced by the following process.
- an aliphatic hydrocarbon for example, hexane, butane, pentane or the like, is impregnated into polymer particles of polystyrene.
- a dielectric constant conditioner is added, and the polystyrene is preexpanded.
- polystyrene preexpanded beads are obtained.
- the preexpanded beads are deposited in a mold and are fusion-molded.
- the inner surface of the mold is identical with the inner surface of the radome 1 such that the fusion-molded body 10 can be mounted in the radome 1 with no space in-between.
- the radome 1 and the lid 5 are made thin, out of the same polystyrene used for the foamy body 10 by a conventional method such as injection molding.
- the foamy body 10 is mounted in the radome 1, and the lid 5 is set at the opening of the radome 1.
- a dielectric lens is assembled.
- the radome 1 and the lid 5 are preferably bonded airtight by an adhesive or by ultrasonic welding.
- the radome 1 is desirably thin for a high antenna gain and is made to be 2mm, and more desirably 1mm or less, in thickness. In point of the antenna gain, it is further preferred that the space between the radome 1 and the foamy body 10 is not more than 0.5mm. If a pigment such as titanium oxide is added to the material of the radome 1, the radome 1 will absorb ultraviolet rays, which helps the foamy body 10 maintain its characteristic and lengthens the life of the lens.
- the followings are exemplary constituents of the foamy body 10.
- the dielectric constant conditioner and the foaming agent were added to the resin, and the resin was preexpanded at an expansion ratio of 15. Then, the preexpanded resin was fusion-molded. As a result, a foamy body 10 which has a dielectric constant of 1.5 and has a weight of 250g was produced.
- the constituents of the materials of the radome 1, the lid 5 and the foamy body 10 are not limited to those described above.
- the resin polystyrene, polypropylene, polyethylene, etc. can be used.
- the foaming agent butane, pentane, etc. can be used.
- the dielectric constant conditioner calcium titanate, barium titanate, etc. can be used.
Landscapes
- Aerials With Secondary Devices (AREA)
- Details Of Aerials (AREA)
Description
- The present invention relates to a dielectric lens, and more particularly to a dielectric lens used as an element of an antenna for receiving microwave for communication and broadcasting.
- A dielectric lens used as an element of an antenna for receiving microwave of 5GHz or more is conventionally produced by: mixing a resin, for example, polypropylene, polyethylene, polystyrene or the like, with ceramic powder, which acts as a foaming agent and as a dielectric constant conditioner; and molding the mixture into a dome. In the molding, the surface of the dielectric lens is solidified, and a radome layer is formed. The radome layer protects the inner foamy body from weathering and reinforces the foamy body.
- In the conventional manufacturing process, the dielectric lens is molded to be thick and accordingly to be heavy. For example, if a mixture of polypropylene and ceramic powder is molded into a dome which is about 180mm in diameter and about 76mm in height, the weight will be about 1kg. Thus, a large quantity of resin is necessary, and the cost of the dielectric lens is high.
- The thickly molded dielectric lens is likely to have a defect such as a sink mark and a swirl mark on the surface (radome layer) and a void inside. The defect can be fairly avoided by adopting injection compression molding. However, the injection compression molding requires a mold of a complicated structure and expensive facilities. Even in the injection compression molding, it is difficult to completely prevent occurrence of a sink mark, a swirl mark and a void. Further, a product by the injection compression molding has residual stress, which is a cause of deflection.
- WO 93/10572 relates to a dielectric material for antennas which is composed of individual pieces which appear essentially homogenous to signals whose frequency is such that their wavelength is greater than the dimension of the pieces. The dielectric material comprises some dielectrical pieces which collectively form a dielectic block which itself has the shape of a dielectric antenna to be produced. The pieces may be fixed to each other, for example by glueing, or may just lay near or on each other. A microwave length antenna comprises a radome cover which may also serve as a matching layer to reduce the amount of reflected signal at the lens surface. The radome cover is made of plastic and may be used as a vessel to contain the unbound plastic pieces.
- WO 89/08932 relates to a solid dielectric lens aerial comprising a lens of dielectric material transparent to radiation. The material for the solid dielectric lens aerial may be silica glass beads or silica flour which is bound together. The lens may comprise a shell formed of two halves and filled with the powder.
- It is the object of the present invention to provide a method of producing a light and inexpensive dielectric lens which does not have a defect such as a sink mark, a swirl mark and a void, and which does not require expensive facilities.
- This object is achieved by a method according to claim 1.
- According to the present invention which is defined in claim 1, the radome and the foamy body are molded separately, and the produced lens is less likely to have a sink mark, a swirl mark and/or a void compared with a conventional dielectric lens produced by integral molding. Also, since preexpanded beads are used for the foamy body, only a small quantity of resin is necessary, thereby lessening the weight. The radome is formed by ordinary thinwall injection molding, and the foamy body is formed by ordinary foaming. Therefore, such expensive facilities as to be used for injection compression molding are not required, and the cost for facilities is low.
- These and other objects and features of the present invention will be apparent from the following description in connection with the accompanying drawings, in which:
- Fig. 1 is an explosive perspective view of a dielectric lens which is an embodiment of the present invention; and
- Fig. 2 is a sectional view of the assembled dielectric lens.
-
- A dielectric lens according to the present invention and a manufacturing process thereof are hereinafter described with reference to the accompanying drawings.
- In Figs. 1 and 2, numeral 1 denotes a radome,
numeral 5 denotes a lid, andnumeral 10 denotes a foamy body. The radome 1 is molded as a dome shell of a specified size. Thefoamy body 10 has a curved surface which is identical with the inner surface of the radome 1 such that thefoamy body 10 will be mounted in the radome 1 with no space in-between. - The
foamy body 10 is produced by the following process. In a water disperse system in an autoclave, an aliphatic hydrocarbon, for example, hexane, butane, pentane or the like, is impregnated into polymer particles of polystyrene. Further, a dielectric constant conditioner is added, and the polystyrene is preexpanded. By the preexpansion, polystyrene preexpanded beads are obtained. Next, the preexpanded beads are deposited in a mold and are fusion-molded. The inner surface of the mold is identical with the inner surface of the radome 1 such that the fusion-moldedbody 10 can be mounted in the radome 1 with no space in-between. - The radome 1 and the
lid 5 are made thin, out of the same polystyrene used for thefoamy body 10 by a conventional method such as injection molding. - The
foamy body 10 is mounted in the radome 1, and thelid 5 is set at the opening of the radome 1. Thus, a dielectric lens is assembled. The radome 1 and thelid 5 are preferably bonded airtight by an adhesive or by ultrasonic welding. The radome 1 is desirably thin for a high antenna gain and is made to be 2mm, and more desirably 1mm or less, in thickness. In point of the antenna gain, it is further preferred that the space between the radome 1 and thefoamy body 10 is not more than 0.5mm. If a pigment such as titanium oxide is added to the material of the radome 1, the radome 1 will absorb ultraviolet rays, which helps thefoamy body 10 maintain its characteristic and lengthens the life of the lens. - The followings are exemplary constituents of the
foamy body 10. - resin: polystyrene at a mixing ratio by weight of 100
- dielectric constant conditioner: calcium titanate at a mixing ratio by weight of 60
- foaming agent: butane
-
- The dielectric constant conditioner and the foaming agent were added to the resin, and the resin was preexpanded at an expansion ratio of 15. Then, the preexpanded resin was fusion-molded. As a result, a
foamy body 10 which has a dielectric constant of 1.5 and has a weight of 250g was produced. - The constituents of the materials of the radome 1, the
lid 5 and thefoamy body 10 are not limited to those described above. As the resin, polystyrene, polypropylene, polyethylene, etc. can be used. As the foaming agent, butane, pentane, etc. can be used. As the dielectric constant conditioner, calcium titanate, barium titanate, etc. can be used.
Claims (3)
- A method for producing a dielectric lens for an antenna, characterized by the following steps:molding a radome (1) as a dome shell of a specified size;forming pre-expanded beads with a specific dielectric constant;fusion-molding the pre-expanded beads into a dome (10) whose curved surface is substantially identical with an inner surface of the radome (1);mounting the fusion-molded dome (10) in the radome (1) and setting a lid (5) at an opening of the radome (1).
- A dielectric lens for an antenna formed by a method according to claim 1, comprisinga radome (1) which is a dome shell of a specified size;pre-expanded beads shaped into a dome (10) whose curved surface is substantially identical with an inner surface of the radome (1).
- The dielectric lens for an antenna as claimed in claim 2, wherein the radome (1) contains an ultra-violet ray absorbing agent.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5161006A JPH0722834A (en) | 1993-06-30 | 1993-06-30 | Dielectric lens for antenna and its production |
JP161006/93 | 1993-06-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0632522A1 EP0632522A1 (en) | 1995-01-04 |
EP0632522B1 true EP0632522B1 (en) | 1999-02-03 |
Family
ID=15726792
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94110099A Expired - Lifetime EP0632522B1 (en) | 1993-06-30 | 1994-06-29 | Dielectric lens for an antenna and manufacturing process thereof |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0632522B1 (en) |
JP (1) | JPH0722834A (en) |
DE (1) | DE69416347T2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7301504B2 (en) | 2004-07-14 | 2007-11-27 | Ems Technologies, Inc. | Mechanical scanning feed assembly for a spherical lens antenna |
CN104149228A (en) * | 2014-07-08 | 2014-11-19 | 中国电子科技集团公司第二十研究所 | Integrated forming die and method for glass fiber reinforced plastic antenna housing |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19741081C1 (en) * | 1997-09-18 | 1999-03-18 | Bosch Gmbh Robert | Method of making an antenna lens |
FR2777117B1 (en) * | 1998-04-06 | 2000-04-28 | Alsthom Cge Alcatel | MULTI-LAYERED FOCUSING SPHERICAL LENS |
JP3650953B2 (en) * | 1998-06-29 | 2005-05-25 | 株式会社村田製作所 | Dielectric lens antenna and radio apparatus using the same |
AU5468700A (en) * | 1999-06-07 | 2000-12-28 | Spike Broadband Systems, Inc. | Multimode sectored antenna systems |
JP3566598B2 (en) * | 1999-09-30 | 2004-09-15 | 株式会社東芝 | Antenna device |
FR2804249A1 (en) * | 2000-01-26 | 2001-07-27 | Thomson Multimedia Sa | DEVICE FOR TRANSMITTING AND / OR RECEIVING ELECTROMAGNETIC WAVES COMPRISING A LENS HAVING A CONFORMED VOLUME OF DIELECTRIC MATERIAL |
JP2001279014A (en) * | 2000-03-31 | 2001-10-10 | Achilles Corp | Dielectric expansion-molded product having improved dimensional stability |
JP3521845B2 (en) * | 2000-05-12 | 2004-04-26 | 日本電気株式会社 | Dielectric lens and method of manufacturing the same |
US20060165971A1 (en) * | 2003-03-11 | 2006-07-27 | Masatoshi Kuroda | Luneberg lens and process for producing the same |
JP3599058B1 (en) * | 2003-07-31 | 2004-12-08 | 住友電気工業株式会社 | Luneberg lens and antenna device using the same |
DE102005035814A1 (en) * | 2005-07-30 | 2007-02-01 | Hella Kgaa Hueck & Co. | Manufacture of radome for radar system of vehicle using dielectric lens |
MA41344B1 (en) | 2015-01-14 | 2019-01-31 | Synthos Sa | Combination of silica and graphite and its use to reduce the thermal conductivity of a vinyl aromatic polymer foam |
MA41342A (en) | 2015-01-14 | 2017-11-21 | Synthos Sa | PROCESS FOR THE PRODUCTION OF EXPANDABLE AROMATIC VINYL POLYMER GRANULATES WITH REDUCED THERMAL CONDUCTIVITY |
EP3245242B1 (en) * | 2015-01-14 | 2018-08-29 | Synthos S.A. | Use of a mineral having perovskite structure in vinyl aromatic polymer foam |
PL3245172T3 (en) | 2015-01-14 | 2019-06-28 | Synthos S.A. | Expandable vinyl aromatic polymer granulate and expanded vinyl aromatic polymer foam comprising geopolymer composite and its use therein |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4550003A (en) * | 1983-12-13 | 1985-10-29 | Asahi Kasei Kogyo Kabushiki Kaisha | Vinylidene chloride type resin expandable particles, foam particles, in-mold foam molding by use thereof and process for producing them |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3917773A (en) * | 1973-12-26 | 1975-11-04 | Us Navy | Method for fabricating a shaped dielectric antenna lens |
JPS50116259A (en) * | 1974-02-26 | 1975-09-11 | ||
JPS5122355A (en) * | 1974-08-19 | 1976-02-23 | Nippon Electric Co | Hanshaban oyobisono seizohoho |
JPS6052528B2 (en) * | 1977-05-02 | 1985-11-20 | 株式会社トキメック | Lightweight mixed dielectric and its manufacturing method |
US4482513A (en) * | 1981-03-10 | 1984-11-13 | General Dynamics, Pomona Division | Method of molding foam/aluminum flake microwave lenses |
US4640280A (en) * | 1985-08-12 | 1987-02-03 | Rca Corporation | Microwave hyperthermia with dielectric lens focusing |
GB8603206D0 (en) * | 1986-02-10 | 1986-03-19 | Ca Minister Nat Defence | Projectile |
JPS63300608A (en) * | 1987-05-29 | 1988-12-07 | Mitsubishi Electric Corp | Antenna system |
GB8804175D0 (en) * | 1988-02-23 | 1988-03-23 | Secr Defence | Solid dielectric lens aerial |
JPH0380604A (en) * | 1989-08-23 | 1991-04-05 | Murata Mfg Co Ltd | Dielectric lens antenna |
JPH03103608U (en) * | 1990-02-13 | 1991-10-28 | ||
JP2738143B2 (en) * | 1990-10-31 | 1998-04-08 | 日本電気株式会社 | Satellite receiving antenna |
JPH0548318A (en) * | 1991-08-20 | 1993-02-26 | Murata Mfg Co Ltd | Lens antenna |
JPH0548319A (en) * | 1991-08-20 | 1993-02-26 | Murata Mfg Co Ltd | Lens antenna |
WO1993010572A1 (en) * | 1991-11-19 | 1993-05-27 | Thomson Consumer Electronics S.A. | Dielectric material for antennas |
JP3227910B2 (en) * | 1993-06-30 | 2001-11-12 | 株式会社村田製作所 | Manufacturing method of dielectric lens |
JPH0716861A (en) * | 1993-06-30 | 1995-01-20 | Murata Mfg Co Ltd | Production of dielectric antenna element |
-
1993
- 1993-06-30 JP JP5161006A patent/JPH0722834A/en active Pending
-
1994
- 1994-06-29 DE DE1994616347 patent/DE69416347T2/en not_active Expired - Fee Related
- 1994-06-29 EP EP94110099A patent/EP0632522B1/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4550003A (en) * | 1983-12-13 | 1985-10-29 | Asahi Kasei Kogyo Kabushiki Kaisha | Vinylidene chloride type resin expandable particles, foam particles, in-mold foam molding by use thereof and process for producing them |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7301504B2 (en) | 2004-07-14 | 2007-11-27 | Ems Technologies, Inc. | Mechanical scanning feed assembly for a spherical lens antenna |
CN104149228A (en) * | 2014-07-08 | 2014-11-19 | 中国电子科技集团公司第二十研究所 | Integrated forming die and method for glass fiber reinforced plastic antenna housing |
Also Published As
Publication number | Publication date |
---|---|
DE69416347T2 (en) | 1999-07-15 |
JPH0722834A (en) | 1995-01-24 |
DE69416347D1 (en) | 1999-03-18 |
EP0632522A1 (en) | 1995-01-04 |
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