초록 ▼

A method and apparatus are shown for generating and transmitting very short and widely separated high frequency sine-wave pulses of electromagnetic energy into space. A transistor, a charging capacitor, and an inductor are coupled into a first series loop path to form a discharge circuit. A bias vol

A method and apparatus are shown for generating and transmitting very short and widely separated high frequency sine-wave pulses of electromagnetic energy into space. A transistor, a charging capacitor, and an inductor are coupled into a first series loop path to form a discharge circuit. A bias voltage source, the same charging capacitor, and a charging resistor are coupled into a second series loop path to form a recharging circuit. The bias voltage source is selected to be capable of biasing the forward conduction path of the transistor near its breakdown condition. An original information signal is sampled upon each occurrence of a periodic reference signal, and the transistor is then triggered into its breakdown or avalanche mode. The starting times of successive transmitted pulses are modified in accordance with a pulse position modulation protocol.

대표청구항 ▼

Art electrical circuit for generating intermittent high frequency pulses of extremely brief duration, comprising: (a) a transistor having a base, emitter, and collector; (b) an inductor having one end connected to the base of said transistor; (c) a first resistor connected between the other end of s

Art electrical circuit for generating intermittent high frequency pulses of extremely brief duration, comprising: (a) a transistor having a base, emitter, and collector; (b) an inductor having one end connected to the base of said transistor; (c) a first resistor connected between the other end of said inductor and ground; (d) a charging capacitor coupled between ground and the collector of said transistor to form a series loop circuit with the base-collector conduction path of said transistor; (e) a source of bias voltage; (f) a charging resistor connected between said bias voltage source and the collector of said transistor, for biasing said transistor near its avalanche breakdown voltage as well as supplying a charge to said charging capacitor that may be discharged through said transistor; (g) a bias resistor connected between the emitter of said transistor and the other end of said inductor; (h) a coupling capacitor coupled to the emitter of said transistor for applying intermittent triggering pulses thereto to produce an avalanche of current from said charging capacitor through said transistor in response to each said triggering pulse; (i) said charging resistor being selected of sufficiently large value to permit the recharging of said charging capacitor at only a slow rate so that the avalanche current discharged through said transistor in response to each pulse is essentially limited to the charge previously stored on said charging capacitor; and (j) the capacity of said charging capacitor, the maximum voltage applied to said charging capacitor, and the time interval between successive triggering pulses, being such as to avoid destruction of said transistor.