Motion detector

Claim 2

A motion detection apparatus, comprising means including an oscillator means having a solid state amplifying means, antenna means coupled to said oscillator means to transmit a protective field and to receive and mix a related reflected echo signal with the transmitted signal and impress both the transmitted and received signals upon said solid state amplifying means, said solid state amplifying means having a common transmitting and receiving solid state input element having a non-linear characteristic and operating without a negative resistance characteristic portion, said solid state input element simultaneously functioning as the active element of the oscillator and as a detector and mixer to directly mix said transmitted and received signals and establish an oscillator output signal related to the selected reflected signals, said amplifying means establishing amplification of the echo signal.

Claim 3

A motion detection apparatus, comprising means including an oscillator means having a solid state amplifying means, antenna means coupled to said oscillator means to transmit a protective field and to receive and mix a related reflected echo signal with the transmitted signal and impress both the transmitted and received signals upon said solid state amplifying means, said solid state amplifying means having a non-linear characteristic and simultaneously functioning as the active element of the oscillator and as a detector and mixer to directly mix said transmitted and received signals and establish an oscillator output signal related to the selected reflected signals, said oscillator means has a wave guide means and establishes an alternating current field, said antenna means being coupled to said alternating current field to transmit said field as the protective field and to introduce a reflected field corresponding to the echo signal with the alternating current field and thereby impress both the transmitted and echo fields upon said solid state amplifying means.

Claim 4

A motion detection apparatus, comprising means including an oscillator means having a solid state amplifying means, antenna means coupled to said oscillator means to transmit a protective field and to receive and mix a related reflected echo signal with the transmitted signal and impress both the transmitted and received signals upon said solid state amplifying means, said solid state amplifying means having a non-linear characteristic and simultaneously functioning as the active element of the oscillator and as a detector and mixer to directly mix said transmitted and received signals and establish an oscillator output signal related to the selected reflected signals, said oscillator means has a wave guide means and establishes an alternating current field, said antenna means being coupled to said alternating current field to transmit said field as the protective field and to introduce a reflected field corresponding to the echo signal with the alternating current field and thereby impress both the transmitted and echo fields upon said solid state amplifying means.

Claim 5

The motion detection apparatus of claim 1, wherein said oscillator means includes an inductive cavity coupled to the solid state input element and defining an inductive control means in the oscillator, and means coupling the antenna to the inductive cavity.

Claim 6

A motion detection apparatus, comprising means including an oscillator means having a solid state amplifying means, antenna means coupled to said oscillator means to transmit a protective field and to receive and mix a related reflected echo signal with the transmitted signal and impress both the transmitted and received signals upon said solid state amplifying means, said solid state amplifying means having a noN-linear characteristic and simultaneously functioning as the active element of the oscillator and as a detector and mixer to directly mix such transmitted and received signals and establish an oscillator output signal related to the selected reflected signals, said oscillator means includes a coaxial line defining an inductive cavity coupled to the solid state amplifying means to form an inductive control means in the oscillator means, and means coupling the antenna to the inductive cavity.

Claim 7

A motion detection apparatus, comprising means including an oscillator means having a solid state amplifying means, antenna means coupled to said oscillator means to transmit a protective field and to receive and mix a related reflected echo signal with the transmitted signal and impress both the transmitted and received signals upon said solid state amplifying means, said solid state amplifying means having a noN-linear characteristic and simultaneously functioning as the active element of the oscillator and as a detector and mixer to directly mix such transmitted and received signals and establish an oscillator output signal related to the selected reflected signals, said oscillator means includes a coaxial line defining an inductive cavity coupled to the solid state amplifying means to form an inductive control means in the oscillator means, and means coupling the antenna to the inductive cavity.

Claim 8

The motion detection apparatus of claim 1, wherein said input element is a transistor having a load resistor connected in series with a terminal means of the transistor, an inductive cavity means coupled to terminal means of the transistor to cooperate with the inherent capacitance of the transistor junctions to define said oscillator, and means to couple the antenna means to said inductive cavity means.

Claim 9

The motion detection apparatus of claim 1, wherein said input element includes a transistor connected in a common base configuration to a bias source, a load resistor connected in series with the emitter of the transistor, inductive cavity means coupled to the base and collector junction of the transistor to cooperate with the inherent capacitance of the transistor junctions and define said oscillator, and means to couple the antenna means to said inductive cavity.

Claim 10

Motion detection apparatus of claim 1, wherein said input element is a transistor having an output resistor connected to a terminal means of the transistor, a coaxial transmission line and a direct current isolating capacitive means connected to said coaxial transmission line and to said transistor to define an inductive cavity means connected to elements of the transistor and to thereby form the oscillator means, and means coupling the antenna to said cavity.

Claim 11

Motion detection apparatus of claim 1, wherein said input element includes a transistor connected in a common base configuration to a bias source with an emitter output resistor, a coaxial transmission line and capacitive means connected to said coaxial transmission line and to said transistor to define an inductive cavity means connected across the base to collector of the transistor, and means coupling the antenna to said cavity.

Claim 12

Motion detection apparatus of claim 1, wherein said input element includes a transistor having an output resistor, a coaxial transmission line having an outer cavity wall and a center conductor secured to an end wall of the cavity wall, a pair of capacitive means connected in series between said coaxial conductor and said end wall and to said transistor to define an inductive cavity means connected to the transistor, and cooperating with the junction capacitance to form the oscillator, and means coupling the antenna to the coaxial transmission line.

Claim 13

The motion detection apparatus of claim 9, wherein said transistor is connected in a common base configuration and said resistor is connected to the emitter of the transistor, said cavity wall being connected to a ground reference, said pair of capacitive means having a first capacitive means connected between the base and the cavity wall and selected to define a short circuit condition to the alternating current in the oscillator and a second capacitive means connected between the base and the collector of the transistor and selected to form with said cavity an inductive means between the base and the collector whereby said transistor oscillates to generate said transmitted field and both the transmitted field and the echo field are applied to the transistor and appear across said resistor as a Doppler frequency signal.

Claim 14

A motion detection apparatus comprising means including an oscillator means having a solid state amplifying means, antenna means coupled to said oscillator means to transmit a protective field and to receive and mix a related reflected echo signal with the transmitted signal and impress both the transmitted and received signals upon saId solid state amplifying means, said solid state amplifying means having a non-linear characteristic and simultaneously functioning as the active element of the oscillator and as a detector and mixer to directly mix said transmitted and received signals and establish an oscillator output signal related to the selected reflected signals, a second amplifying means connected to said first amplifying means to amplify said output signal, triggered alarm means connected to said second amplifying means, and a regulated power supply connected to energize said amplifying means and said alarm means.

Claim 15

A motion detection apparatus comprising means including an oscillator means having a solid state amplifying means, antenna means coupled to said oscillator means to transmit a protective field and to receive and mix a related reflected echo signal with the transmitted signal and impress both the transmitted and received signals upon saId solid state amplifying means, said solid state amplifying means having a non-linear characteristic and simultaneously functioning as the active element of the oscillator and as a detector and mixer to directly mix said transmitted and received signals and establish an oscillator output signal related to the selected reflected signals, a second amplifying means connected to said first amplifying means to amplify said output signal, triggered alarm means connected to said second amplifying means, and a regulated power supply connected to energize said amplifying means and said alarm means.