[go: up one dir, main page]

GB723815A - Improvements in piezo-electric systems including a passive responder unit - Google Patents

Improvements in piezo-electric systems including a passive responder unit

Info

Publication number
GB723815A
GB723815A GB16269/52A GB1626952A GB723815A GB 723815 A GB723815 A GB 723815A GB 16269/52 A GB16269/52 A GB 16269/52A GB 1626952 A GB1626952 A GB 1626952A GB 723815 A GB723815 A GB 723815A
Authority
GB
United Kingdom
Prior art keywords
piezo
receiver
systems including
electric systems
responder unit
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
GB16269/52A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 by Individual filed Critical Individual
Publication of GB723815A publication Critical patent/GB723815A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D11/00—Super-regenerative demodulator circuits
    • H03D11/02—Super-regenerative demodulator circuits for amplitude-modulated oscillations
    • 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
    • G01S13/751—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 wherein the responder or reflector radiates a coded signal
    • G01S13/753—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 wherein the responder or reflector radiates a coded signal using frequency selective elements, e.g. resonator
    • 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
    • G01S13/751—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 wherein the responder or reflector radiates a coded signal
    • G01S13/756—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 wherein the responder or reflector radiates a coded signal using a signal generator for modifying the reflectivity of the reflector
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B11/00—Generation of oscillations using a shock-excited tuned circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

723,815. Burglar and like alarms. MAGONDEAUX, L. DE. June 27; 1952 [June 27, 1951], No. 16269/52. Drawings to Specification. Class 118 (1) [Also in Group XL (c) ]. The presence of an intruder is indicated visually or aurally at a radio receiver by the intruder modifying the field of a radio responder device (see Group XL(c)) comprising a resonant antenna and a piezo-electric crystal which re-radiates the energy of a radio signal pulse received by the antenna from a transmitter associated with the receiver. The transmitter-receiver may simply be a superregenerative receiver.
GB16269/52A 1951-06-27 1952-06-27 Improvements in piezo-electric systems including a passive responder unit Expired GB723815A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR723815X 1951-06-27

Publications (1)

Publication Number Publication Date
GB723815A true GB723815A (en) 1955-02-09

Family

ID=9106316

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16269/52A Expired GB723815A (en) 1951-06-27 1952-06-27 Improvements in piezo-electric systems including a passive responder unit

Country Status (2)

Country Link
DE (1) DE969289C (en)
GB (1) GB723815A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1037530B (en) * 1956-02-08 1958-08-28 Pintsch Electro Gmbh Arrangement for the electronic control of the retroreflective capacity of reflectors
DE1058580B (en) * 1956-08-16 1959-06-04 Philips Patentverwaltung Method for the identification of a moving object from a plurality of similar objects by means of a radar system
DE1063219B (en) * 1954-09-27 1959-08-13 Radio Patents Company Radio transmission system with a transmitter-receiver at one end point of the transmission link and with a preferably passive reply transmitter at the other end point
US4376931A (en) 1980-02-07 1983-03-15 Meisei Electric Co., Ltd. System for detecting abnormality in internal pressure of tire

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1102613B (en) * 1959-10-06 1961-03-16 Garrett Corp Remote measuring device
US3307168A (en) * 1962-11-19 1967-02-28 Gen Precision Inc Signalling system
DE1240761B (en) * 1963-10-30 1967-05-18 Gen Electric Object recognition system
SE321883B (en) * 1965-03-05 1970-03-16 A Minasy
US4242661A (en) 1975-03-27 1980-12-30 Stifelsen Institutet for Mikrovagsteknik Vid Tekniska Hogskolan i Stockholm Device for registration of objects
SE413359B (en) 1978-08-25 1980-05-19 Stiftelsen Inst Mikrovags DEVICE FOR ASTAD COMMUNICATION OF A SIMPLE SIDBAND

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR496331A (en) * 1918-01-14 1919-11-04 Submarine Signal Co Improvements in methods and apparatus for the use of radiant pulses as signals and other applications
FR692719A (en) * 1929-03-26 1930-11-10 Siemens Ag Remote measuring device
NL43272C (en) * 1933-08-31
DE738963C (en) * 1935-11-01 1943-09-06 Telefunken Gmbh Procedure for determining the location of aircraft

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1063219B (en) * 1954-09-27 1959-08-13 Radio Patents Company Radio transmission system with a transmitter-receiver at one end point of the transmission link and with a preferably passive reply transmitter at the other end point
DE1037530B (en) * 1956-02-08 1958-08-28 Pintsch Electro Gmbh Arrangement for the electronic control of the retroreflective capacity of reflectors
DE1058580B (en) * 1956-08-16 1959-06-04 Philips Patentverwaltung Method for the identification of a moving object from a plurality of similar objects by means of a radar system
US4376931A (en) 1980-02-07 1983-03-15 Meisei Electric Co., Ltd. System for detecting abnormality in internal pressure of tire

Also Published As

Publication number Publication date
DE969289C (en) 1958-05-14

Similar Documents

Publication Publication Date Title
MX170375B (en) ANTENNA STRUCTURE FOR AN ELECTRONIC ARTICLE SURVEILLANCE SYSTEM
ES454749A1 (en) Electronic security system
MX146468A (en) IMPROVEMENTS IN THE SURVEILLANCE SYSTEM WITHIN A SPACE TO DETECT THE PRESENCE OF A WARNING ELEMENT IN AN AREA NOT AUTHORIZED THROUGH A TRANSMITTER RECEIVER OF ELECTROMAGNETIC WAVES
GB1378689A (en) Vehicle monitoring systems
GB723815A (en) Improvements in piezo-electric systems including a passive responder unit
GB1440398A (en) Reuduction of false alarms in electronic theft-detection systems
WO1990013076A3 (en) A detection system for locating aircraft
GB1308701A (en) Intrusion detection apparatus having protection against jamming
US4284985A (en) Stolen equipment recovery device
FR2351461A1 (en) Theft deterrent system with radio transmitters - has each object fitted with transmitter providing alarm signal when carried out of range
GB918315A (en) Improvements in or relating to secondary radar systems
AR042570A1 (en) APPARATUS AND SYSTEM FOR MONITORING ARTICLES
GB1520196A (en) Alarm and theft prevention apparatus
GB798405A (en) Radio transmitter-receiver tuning system
CN104867284A (en) Personal belonging anti-lost equipment and anti-lost method thereof
GB611315A (en) Improvements in or relating to door checks
GB1361499A (en) Protective system
GB2218553A (en) Security system
GB734672A (en) Improvements in or relating to ultrasonic transducers
FR2279173A2 (en) Anti-theft security system - has central transmitter receiver to interrogates peripheral transmitter receivers
GB959140A (en) Improvements in or relating to arrangements for detecting objects
GB832086A (en) Improvements in or relating to intruder detection systems
GB900776A (en) Improvements in or relating to alarm apparatus
GB1237109A (en) Discriminating amplifier for high frequency detection devices
CH607669GA3 (en) Quartz watch provided with an electronic alarm and remote detection device