BE489994A - - Google Patents
Info
- Publication number
- BE489994A BE489994A BE489994DA BE489994A BE 489994 A BE489994 A BE 489994A BE 489994D A BE489994D A BE 489994DA BE 489994 A BE489994 A BE 489994A
- Authority
- BE
- Belgium
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
- H01Q25/001—Crossed polarisation dual antennas
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- 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
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- 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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
- G01S13/75—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors
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- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/024—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using polarisation effects
- G01S7/025—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using polarisation effects involving the transmission of linearly polarised waves
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- 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
-
- 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
- H01Q15/24—Polarising devices; Polarisation filtersÂ
- H01Q15/242—Polarisation converters
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH667037X | 1948-07-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
BE489994A true BE489994A (xx) |
Family
ID=4527362
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE489994D BE489994A (xx) | 1948-07-06 |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE489994A (xx) |
CH (1) | CH276751A (xx) |
FR (1) | FR990098A (xx) |
GB (1) | GB667037A (xx) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE977757C (de) * | 1962-02-09 | 1969-11-06 | Telefunken Patent | Elektronischer Annaeherungszuender |
FR2131832B1 (xx) * | 1971-03-29 | 1974-05-31 | Automatisme Cie Gle | |
FR2233668A1 (en) * | 1973-06-14 | 1975-01-10 | Radiotechnique Compelec | Electromagnetic microwave surveillance barrier - frontal dimensions are small and receiver element structure is simplified |
-
0
- BE BE489994D patent/BE489994A/xx unknown
-
1949
- 1949-03-30 CH CH276751D patent/CH276751A/de unknown
- 1949-07-05 GB GB17747/49A patent/GB667037A/en not_active Expired
- 1949-07-05 FR FR990098D patent/FR990098A/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR990098A (fr) | 1951-09-17 |
GB667037A (en) | 1952-02-20 |
CH276751A (de) | 1951-07-31 |