GB643679A - Improvements in or relating to radio mirrors and wave guide duct systems - Google Patents
Improvements in or relating to radio mirrors and wave guide duct systemsInfo
- Publication number
- GB643679A GB643679A GB1777347A GB1777347A GB643679A GB 643679 A GB643679 A GB 643679A GB 1777347 A GB1777347 A GB 1777347A GB 1777347 A GB1777347 A GB 1777347A GB 643679 A GB643679 A GB 643679A
- Authority
- GB
- United Kingdom
- Prior art keywords
- walls
- mirror
- radio
- wavelength
- spacing
- 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
- 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
- H01Q15/22—Reflecting surfaces; Equivalent structures functioning also as polarisation filter
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
643,679. Aerials. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. July 4, 1947, No. 17773. [Class 40 (vii)] A circular polarizer for linearly polarized incident radio waves comprises a mirror 2 in conjunction with a plurality of parallel conductive walls 1 arranged edge-on to said mirror. The spacing b is greater than half a wavelength and the dimension w/ 2 is such that during a passage to the mirror and back the component parallel to the walls undergoes a phaseshift of 90 degrees, or an odd multiple thereof, with respect to the perpendicular component. This incident energy linearly polarized at 45 degrees to the walls will emerge circularly polarized. The Specification shows that by suitable choice of the dimensions band w/ 2 , with respect to the wavelength of the radio energy, impedance mismatch on incidence upon and emergence from the mirror structure is avoided, and the system is suitable for wide band operation. Preferably the mirror is paraboloidal and the conductive walls are fixed mechanically and electrically thereto. Strengthening partition plates may be provided at right angles to the conductive walls but their spacing must be greater than that of the walls themselves. The ducts formed between the walls may be filled with low-loss dielectric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1777347A GB643679A (en) | 1947-07-04 | 1947-07-04 | Improvements in or relating to radio mirrors and wave guide duct systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1777347A GB643679A (en) | 1947-07-04 | 1947-07-04 | Improvements in or relating to radio mirrors and wave guide duct systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB643679A true GB643679A (en) | 1950-09-27 |
Family
ID=10100955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1777347A Expired GB643679A (en) | 1947-07-04 | 1947-07-04 | Improvements in or relating to radio mirrors and wave guide duct systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB643679A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2970312A (en) * | 1959-09-21 | 1961-01-31 | Robert M Smith | Broad band circularly polarized c-band antenna |
-
1947
- 1947-07-04 GB GB1777347A patent/GB643679A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2970312A (en) * | 1959-09-21 | 1961-01-31 | Robert M Smith | Broad band circularly polarized c-band antenna |
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