INTRUSION DETECTION APPARATUS HAVING A HIGH FREQUENCY DIODE OSCILLATOR-MIXER ELEMENT

An intrusion detector detects motion of a human intruder into a selected volumetric space. An oscillator-detector avalanche or impatt diode operating above 4GHz is mounted within an open ended conductive cavity of a coaxial line construction to define the active transmitting and mixing element of an...

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Bibliographische Detailangaben
Hauptverfasser:	PRIDEMORE, DONALD F, BAILEY, JAMES R, KLEIN, CARL F, KORTA, LAWRENCE B
Format:	Patent
Sprache:	eng
Schlagworte:	ALARM SYSTEMS ANALOGOUS ARRANGEMENTS USING OTHER WAVES BASIC ELECTRONIC CIRCUITRY DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES ELECTRICITY GENERATION OF NOISE BY SUCH CIRCUITS GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING ORDER TELEGRAPHS PHYSICS RADIO DIRECTION-FINDING RADIO NAVIGATION SIGNALLING SIGNALLING OR CALLING SYSTEMS TESTING
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Beschreibung
Zusammenfassung:	An intrusion detector detects motion of a human intruder into a selected volumetric space. An oscillator-detector avalanche or impatt diode operating above 4GHz is mounted within an open ended conductive cavity of a coaxial line construction to define the active transmitting and mixing element of an oscillator-mixer establishing an RF field in the selected space and receiving the motion related signals via a common antenna. The diode is exposed to both the transmitted and the echo signal and produces a Doppler frequency output signal which is connected to an alarm. The system antenna and a load coupling impedance transformer are selected to optimize the magnitude of the Doppler motion signal response sensitivity. The microwave frequency oscillator signal is modulated by loosely coupling a general purpose diode to the open end of the oscillator-mixer open ended cavity.