GB881824A - Improvements in or relating to electro-magnetic wave transmission arrangements - Google Patents
Improvements in or relating to electro-magnetic wave transmission arrangementsInfo
- Publication number
- GB881824A GB881824A GB17364/60A GB1736460A GB881824A GB 881824 A GB881824 A GB 881824A GB 17364/60 A GB17364/60 A GB 17364/60A GB 1736460 A GB1736460 A GB 1736460A GB 881824 A GB881824 A GB 881824A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phase
- shift
- section
- wave
- frequency
- 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
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/02—Bends; Corners; Twists
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
881,824. Waveguides. TELEFUNKEN G.m.b.H. May 17, 1960 [May 22, 1959], No. 17364/60. Class 40(8). The frequency-dependent phase-shifts occurring between the two orthogonally resolved components of a circularly or elliptically polarized wave are compensated over a band of frequencies by a section of waveguide of appropriately chosen crosssection and length. The anti-clutter radar apparatus shown comprises a circularizing device 3, a bend 5, a horn 2 and a reflector 1. The bend 5 and the horn 2 (which may have a rectangular cross-section) introduce differential phase-shifts in the horizontal and vertical components of the wave propagated through the system causing a departure from circularity or from the desired ellipticity of the transmitted wave. This differential phaseshift is, moreover, frequency-dependent. According to the invention, the system includes a length L of rectangular waveguide whose cross-section is chosen to produce a phase-shift between the orthogonal components of the wave which is frequencydependent in a sense tending to oppose the undesired frequency dependence. Thus the overall differential phase-shift is maintained constant over a band of frequencies. This constant phase-shift may be compensated by adjustment of the circularizer 3, e.g. if it is desired to produce circular polarization at the mouth of horn 2 the circularizer is adjusted to produce a wave of such ellipticity that it would be converted to circularity by the subsequent phase-shifts. An adjustable dielectric plate 6 which is designed to affect only one of the two orthogonal components, can be used for this purpose. From the arbitrarilychosen width and length of the section L the phase-shift of the vertical component may be calculated. The height of the section is then chosen to produce a frequency dependent phase-shift in the horizontal component such that the overall differences in phaseshift between the two components at either extremity of the frequency band are made equal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE881824X | 1959-05-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB881824A true GB881824A (en) | 1961-11-08 |
Family
ID=6831436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB17364/60A Expired GB881824A (en) | 1959-05-22 | 1960-05-17 | Improvements in or relating to electro-magnetic wave transmission arrangements |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB881824A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2093587A2 (en) * | 2008-02-25 | 2009-08-26 | RST Raumfahrt Systemtechnik GmbH | Dual-frequency band dual-polarisation SAR |
-
1960
- 1960-05-17 GB GB17364/60A patent/GB881824A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2093587A2 (en) * | 2008-02-25 | 2009-08-26 | RST Raumfahrt Systemtechnik GmbH | Dual-frequency band dual-polarisation SAR |
| EP2093587A3 (en) * | 2008-02-25 | 2010-03-24 | RST Raumfahrt Systemtechnik GmbH | Dual-frequency band dual-polarisation SAR |
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