GB576941A - Improvements in directive wireless systems - Google Patents
Improvements in directive wireless systemsInfo
- Publication number
- GB576941A GB576941A GB1450940A GB1450940A GB576941A GB 576941 A GB576941 A GB 576941A GB 1450940 A GB1450940 A GB 1450940A GB 1450940 A GB1450940 A GB 1450940A GB 576941 A GB576941 A GB 576941A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reflector
- dipole
- producing
- divergent
- focused
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
- H01Q25/002—Antennas or antenna systems providing at least two radiating patterns providing at least two patterns of different beamwidth; Variable beamwidth antennas
Landscapes
- Aerials With Secondary Devices (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
576,941. Directive wireless signalling; radiolocation. DOWSETT, H. M. Sept. 24, 1940, No. 14509. [Class 40 (v)] Apparatus for producing an electromagnetic beam having two concentric parts, comprises a single dipole and separate reflector systems so constructed that the complete beam retains the individual divergent character of the two concentric parts for the whole of its length. The dipole AOB is arranged at one focus of a double ellipsoidal reflector CD, part of the radiation being focused at S by the reflector C, and the other part being focused by the reflector D at the point P from which it passes to a further ellipsoidal reflector E which focuses it at the same point S, thus producing two concentric divergent beams. In a modified arrangement, the reflector E is paraboloidal, producing a hollow cylindrical beam within the divergent beam. The dipole is rigidly mounted on the reflector which is mounted on trunnions so that it can be moved like a searchlight. For receiving the reflected rays, a pair of crossed dipoles R1, R2, Fig. 2, and associated reflector wires may be mounted on the reflector axis behind or in front of the transmitting dipole where there is no radiation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1450940A GB576941A (en) | 1940-09-24 | 1940-09-24 | Improvements in directive wireless systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1450940A GB576941A (en) | 1940-09-24 | 1940-09-24 | Improvements in directive wireless systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB576941A true GB576941A (en) | 1946-04-29 |
Family
ID=10042483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1450940A Expired GB576941A (en) | 1940-09-24 | 1940-09-24 | Improvements in directive wireless systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB576941A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2825063A (en) * | 1953-11-20 | 1958-02-25 | Roy C Spencer | Double parabolic cylinder pencil beam antenna |
| DE1264537B (en) * | 1959-08-12 | 1968-03-28 | Bendix Corp | Device for measuring small displacements of a nearby object due to wave reflection |
-
1940
- 1940-09-24 GB GB1450940A patent/GB576941A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2825063A (en) * | 1953-11-20 | 1958-02-25 | Roy C Spencer | Double parabolic cylinder pencil beam antenna |
| DE1264537B (en) * | 1959-08-12 | 1968-03-28 | Bendix Corp | Device for measuring small displacements of a nearby object due to wave reflection |
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