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
Application number
GB3787869A
Other languages
English (en)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Publication of GB1257692A publication Critical patent/GB1257692A/en
Expired legal-status Critical Current

Links

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)
GB3787869A 1969-07-28 1969-07-28 Expired GB1257692A (ja)

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)

* Cited by examiner, † Cited by third party
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

Cited By (6)

* Cited by examiner, † Cited by third party
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