Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1978-07-20
1980-02-26
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
325364, 343 7PL, G01S 740, H04B 1700
Patent
active
041908384
ABSTRACT:
A radiation detector such as a radar detector is disclosed. The radiation detector includes a phase lock circuit with a modulating frequency oscillator, a radiation frequency antenna for receiving radiation, a radiation frequency modulator for modulating the radiation received with the modulating frequency, an envelope detector for detecting the modulated radiation envelope, an amplifier phase shift circuit AC coupled to the envelope detector and an alarm circuit. The phase lock circuit is responsive to the output of the amplifier-phase shift circuit. In one arrangement, the output of the phase lock circuit is a two state switch output responsive to the AC output of the amplifier-phase shift circuit. The radiation detector also includes a strip-type transmission line connecting the radiation frequency antenna, the radiation frequency modulator and the envelope detector. In one such arrangement, the radiation frequency modulator includes a p-i-n diode driven by the modulating frequency oscillator. A preferred arrangement of the envelope detector includes a Schottky diode in parallel with a capacitor connected between the conductors of the strip-type transmission line for half wave rectifying the modulated radiation. A signal attenuator attenuates the AC output of the amplifier-phase shift circuit when the phase lock circuit is in the second state so that the audible alarm phases in and out for weak signals.
REFERENCES:
patent: 2300081 (1942-10-01), White
patent: 3094663 (1963-06-01), Siegel
patent: 3246322 (1966-04-01), Kuecken
patent: 3408574 (1968-10-01), Schmidt et al.
patent: 3530470 (1970-09-01), Sheftelman et al.
patent: 3550008 (1970-12-01), Bright
patent: 4072947 (1978-02-01), Johnson
Hubler Malcolm F.
Kanz Jack A.
R A Electronics, Inc.
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