IE61873B1 - A Radiation Antenna - Google Patents
A Radiation AntennaInfo
- Publication number
- IE61873B1 IE61873B1 IE38390A IE38390A IE61873B1 IE 61873 B1 IE61873 B1 IE 61873B1 IE 38390 A IE38390 A IE 38390A IE 38390 A IE38390 A IE 38390A IE 61873 B1 IE61873 B1 IE 61873B1
- Authority
- IE
- Ireland
- Prior art keywords
- antenna
- mesh
- radiation
- rectangular
- reflector
- Prior art date
Links
Classifications
-
- 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
- H01Q15/14—Reflecting surfaces; Equivalent structures
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
A radiation antenna 1 has a main antenna reflector 2 formed from an integral mesh. The mesh may be formed by stamping from metal sheet or by welding. The mesh may be pressed into a parabolic curve.
Description
The present invention relates to radiation antennae generally and more particularly to those for reception of microwave information, such as video signals, data etc.
Such antennae are generally of parabolic shape for effective signal detection, and many, such as that described in United States Patent Specification No. 4,608,710 are constructed from a sheet of metal or other suitable material. Such antennae are, however, not very suitable for outdoor use, especially in windy conditions. Other antennae are in the form of a frame having rods which are welded or bolted to a framework. Such antennae are relatively difficult and time consuming to manufacture and are relatively easily damaged.
The present invention is directed towards providing an improved construction of radiation antenna to overcome these problems.
According to the invention there is provided a radiation antenna having a main antenna reflector formed from an integral mesh of radiation-receiving material wherein the main reflector is formed by pressing a rectangular mesh into a parabolic curve, and wherein the corners of the mesh are turned outwardly.
The material is preferably steel.
Ideally, the mesh reflector is formed by stamping a metal sheet or pre-welded mesh (weld mesh).
In another embodiment, the mesh includes a rectangular array of rectangular cut-outs and the mesh is formed into a parabolic curve.
In an ideal embodiment of the invention, the antenna is adapted for reception of microwave signals at a frequency of 2.0 to 3.0 Ghz and the mesh cut-outs have approximate dimensions of 25 mm x 12 mm.
Preferably, the antenna is arranged to be mounted on a mast. In this latter embodiment, clamps are ideally used for securing the antenna to the mast.
The invention will be more clearly understood from the following description of an embodiment thereof, given by way of example only with reference to the accompanying drawing which is a perspective view of a microwave antenna of the invention.
Referring to the drawing, there is illustrated a microwave antenna of the invention, indicated generally by the reference numeral 1. The antenna main reflector is formed from a rectangular metal sheet stamped by a die to form a mesh of rectangular cut-outs 2 or weld mesh. The reflector 1 is then pressed to form a parabolic curve and the four corners 9 are bent outwardly to provide improved rigidity. The antenna 1 is arranged to be secured to a mast etc. using clamp 5.
A sub-reflector 4 and receiver circuitry is situated within a housing 10. Four bolted clamps 6 secure the antenna to the clamp 5 and a wing nut and bolt arrangement 7 is used for securing the clamp 5 to the mast wall etc. A signal cable 8 is connected to the circuitry housing 10.
In this embodiment, the cut-outs 2 are of dimensions 25 mm x 12 mm and are thus suitable for reception of microwaves signals at 2.0 to 3.0 GHz. Needless to say, other dimensions may be used for reception of different frequency signals.
It will be appreciated that the antenna of the invention is relatively simple and inexpensive to manufacture, and is durable in outdoor use because of the integral construction and the rigidity which is provided by the shape of the corners 9. It will also be appreciated that it is relatively easy to form such a mesh into a parabolic curve shape and there will be very little distortion in the pressing operation.
A further advantage of the invention is that in outdoor use wind will not catch in the antenna and rain water will not gather in it. Thus, little maintenance would be required provided the antenna is clamped securely to a mast etc.
Claims (8)
1. A radiation antenna having a main antenna reflector formed from an integral mesh of radiation-receiving * material wherein the main reflector is formed bypressing a rectangular mesh into a parabolic curve, and wherein the corners of the mesh are turned outwardly.
2. An antenna as claimed in Claim 1, wherein the mesh is formed by stamping from a metal sheet.
3. An antenna as claimed in Claim 1, wherein the mesh is formed by welding.
4. An antenna as claimed in any preceding claim, wherein the mesh has a rectangular array of rectangular apertures.
5. An antenna as claimed in Claim 4, wherein the apertures have approximate dimensions of 12 mm by 25 mm.
6. An antenna as claimed in any preceding claim, wherein the material of the mesh is steel.
7. An antenna as claimed in any preceding claim, further including a clamp for securing the antenna to a mast.
8. An antenna substantially as described with reference to the accompanying drawing.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE38390A IE61873B1 (en) | 1990-02-02 | 1990-02-02 | A Radiation Antenna |
| GB9017272A GB2240662A (en) | 1990-02-02 | 1990-08-07 | A radiation antenna |
| ZA908033A ZA908033B (en) | 1990-02-02 | 1990-10-08 | A radiation antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE38390A IE61873B1 (en) | 1990-02-02 | 1990-02-02 | A Radiation Antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IE900383A1 IE900383A1 (en) | 1991-08-14 |
| IE61873B1 true IE61873B1 (en) | 1994-11-30 |
Family
ID=11011583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE38390A IE61873B1 (en) | 1990-02-02 | 1990-02-02 | A Radiation Antenna |
Country Status (3)
| Country | Link |
|---|---|
| GB (1) | GB2240662A (en) |
| IE (1) | IE61873B1 (en) |
| ZA (1) | ZA908033B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9125401D0 (en) * | 1991-11-29 | 1992-01-29 | Concentric Pressed Products Lt | Reflector antennae |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE408473A (en) * | 1934-03-21 | |||
| NL290652A (en) * | 1962-04-04 | |||
| DE2460807C3 (en) * | 1974-12-21 | 1981-04-02 | Messerschmitt-Bölkow-Blohm GmbH, 8000 München | Flat, lightweight component made of fiber-reinforced plastic |
| GB2120857B (en) * | 1982-04-28 | 1985-10-30 | British Aerospace | Reflectors |
| GB2124431A (en) * | 1982-07-08 | 1984-02-15 | Gec Engineering | Improvements in or relating to reflectors |
| US4916459A (en) * | 1986-03-19 | 1990-04-10 | Hitachi, Ltd. | Parabolic antenna dish |
| US4812854A (en) * | 1987-05-05 | 1989-03-14 | Harris Corp. | Mesh-configured rf antenna formed of knit graphite fibers |
| EP0290124A3 (en) * | 1987-05-07 | 1990-03-21 | Trw Inc. | Hybrid mesh and rf reflector embodying the mesh |
-
1990
- 1990-02-02 IE IE38390A patent/IE61873B1/en not_active IP Right Cessation
- 1990-08-07 GB GB9017272A patent/GB2240662A/en not_active Withdrawn
- 1990-10-08 ZA ZA908033A patent/ZA908033B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| IE900383A1 (en) | 1991-08-14 |
| GB9017272D0 (en) | 1990-09-19 |
| GB2240662A (en) | 1991-08-07 |
| ZA908033B (en) | 1991-07-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Patent lapsed | ||
| MM4A | Patent lapsed |