GB1257692A - - Google Patents
Info
- Publication number
- GB1257692A GB1257692A GB3787869A GB1257692DA GB1257692A GB 1257692 A GB1257692 A GB 1257692A GB 3787869 A GB3787869 A GB 3787869A GB 1257692D A GB1257692D A GB 1257692DA GB 1257692 A GB1257692 A GB 1257692A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transponder
- signal
- khz
- loop
- 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
- 230000001939 inductive effect Effects 0.000 abstract 2
- 230000011664 signaling Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
- H04B5/45—Transponders
-
- 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)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3787869 | 1969-07-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1257692A true GB1257692A (ja) | 1971-12-22 |
Family
ID=10399650
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3787869A Expired GB1257692A (ja) | 1969-07-28 | 1969-07-28 |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1257692A (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2202108A (en) * | 1987-03-03 | 1988-09-14 | Silkeborg Elect Identific Syst | Transponder identification |
GB2254756A (en) * | 1991-04-11 | 1992-10-14 | Q M Systems Limited | Personnel location monitoring system |
GB2277850A (en) * | 1993-05-05 | 1994-11-09 | Eident Limited | Intelligent radio frequency transponder system |
GB2271692B (en) * | 1992-10-13 | 1997-04-09 | Marconi Gec Ltd | Vehicle location system |
WO2005020449A2 (en) * | 2003-08-19 | 2005-03-03 | Plextek Limited | Proximity detecting apparatus |
-
1969
- 1969-07-28 GB GB3787869A patent/GB1257692A/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2202108A (en) * | 1987-03-03 | 1988-09-14 | Silkeborg Elect Identific Syst | Transponder identification |
GB2254756A (en) * | 1991-04-11 | 1992-10-14 | Q M Systems Limited | Personnel location monitoring system |
GB2271692B (en) * | 1992-10-13 | 1997-04-09 | Marconi Gec Ltd | Vehicle location system |
GB2277850A (en) * | 1993-05-05 | 1994-11-09 | Eident Limited | Intelligent radio frequency transponder system |
WO2005020449A2 (en) * | 2003-08-19 | 2005-03-03 | Plextek Limited | Proximity detecting apparatus |
WO2005020449A3 (en) * | 2003-08-19 | 2005-04-21 | Plextek Ltd | Proximity detecting apparatus |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |