GB957247A - Improvements in or relating to aerial systems - Google Patents
Improvements in or relating to aerial systemsInfo
- Publication number
- GB957247A GB957247A GB1967462A GB1967462A GB957247A GB 957247 A GB957247 A GB 957247A GB 1967462 A GB1967462 A GB 1967462A GB 1967462 A GB1967462 A GB 1967462A GB 957247 A GB957247 A GB 957247A
- Authority
- GB
- United Kingdom
- Prior art keywords
- directional
- elements
- fed
- producing
- pattern
- 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
- Radar Systems Or Details Thereof (AREA)
Abstract
957,247. Aerials; radar. MARCONI CO. Ltd. Feb. 5, 1963 [May 22, 1962], No. 19674/62. Headings H4A and H4D. An aerial system (Fig. 2) capable of producing two radiation patterns (Fig. 1) alternatively, one pattern L being highly directional, the other being less directional but having a dip N in the position shown, comprises a plurality of elements H fed from T1 through a directional coupler K and a further element (or elements) HC fed from T2 through the same coupler K. The elements H and HC may be Yagi arrays, monopoles, dipoles or as shown horns, the element HC comprising the central element of the system. The directional coupler K introduces a phase delay of 90 degrees in the coupled line and the lengths of the feeders FH differ from the length of the feeder FHC whereby when the system is supplied at T1 all the elements are fed in phase (producing the directional pattern) whereas when the system is supplied at T2 the elements H radiate in phase opposition to the element HC (producing the less directive pattern). The receiver (not shown) is arranged to reject pulses in which the strength from the non-directional transmission exceeds that from the directional transmission. The invention is applied to I.F.F. secondary radar I.F.F. or air traffic control systems in which an interrogator transmits pairs of pulses, one pulse of each pair being applied to T1 and the other to T2.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1967462A GB957247A (en) | 1962-05-22 | 1962-05-22 | Improvements in or relating to aerial systems |
| FR935681A FR1370637A (en) | 1962-05-22 | 1963-05-22 | Antenna improvements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1967462A GB957247A (en) | 1962-05-22 | 1962-05-22 | Improvements in or relating to aerial systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB957247A true GB957247A (en) | 1964-05-06 |
Family
ID=10133306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1967462A Expired GB957247A (en) | 1962-05-22 | 1962-05-22 | Improvements in or relating to aerial systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB957247A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3743123A1 (en) * | 1986-12-22 | 1988-07-07 | Mitsubishi Electric Corp | ANTENNA DEVICE |
| US6377212B1 (en) | 1995-07-07 | 2002-04-23 | Bae Systems Avionics Limited | Radar apparatus employing a sidelobe blanking system |
-
1962
- 1962-05-22 GB GB1967462A patent/GB957247A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3743123A1 (en) * | 1986-12-22 | 1988-07-07 | Mitsubishi Electric Corp | ANTENNA DEVICE |
| US4827270A (en) * | 1986-12-22 | 1989-05-02 | Mitsubishi Denki Kabushiki Kaisha | Antenna device |
| DE3743123C2 (en) * | 1986-12-22 | 1998-08-20 | Mitsubishi Electric Corp | Antenna device |
| US6377212B1 (en) | 1995-07-07 | 2002-04-23 | Bae Systems Avionics Limited | Radar apparatus employing a sidelobe blanking system |
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