Communications: directive radio wave systems and devices (e.g. – Radar ew – Detection of surveilance
Patent
1988-09-12
1990-10-02
Barron, Jr., Gilberto
Communications: directive radio wave systems and devices (e.g.,
Radar ew
Detection of surveilance
342175, 455168, 455319, 455325, 455330, G01S 7285, H04B 128
Patent
active
049610740
ABSTRACT:
The invention concerns radar detectors which are capable of monitoring at least two frequency bands. A broad band antenna is provided, together with a mixer comprising an anti-parallel pair of diodes, and at least one local oscillator. The local oscillator frequency is mixed with radar frequency from the antenna to produce an intermediate signal which is amplified further down converted detected and fed to signal processing circuitry to actuate an alarm when radar frequency of interest is detected. The most effective mixing with the RF input takes place at twice the local oscillator frequency. By application of direct current bias to the mixer, the most effective mixing with the RF input is changed to occur at the local oscillator frequency. The local oscillator is used to monitor two different radar frequencies by application and non-application of DC bias to the mixer. For multiband detectors, more than one local oscillator may be used.
REFERENCES:
patent: 2460900 (1949-02-01), Newbold
patent: 4461041 (1984-07-01), Dobrovolny
patent: 4553266 (1985-11-01), Bates et al.
patent: 4571593 (1986-02-01), Martinson
patent: 4613989 (1986-09-01), Fende et al.
patent: 4630054 (1986-12-01), Martinson
patent: 4691379 (1987-09-01), Shizune
Hilsop, "An 88-100 GHz Receiver Front End", Conf. 1979, IEEE Int. Microwave Symposium Digest, Orlando, Fla. 1979.
B.E.L-Tronics Limited
Barron Jr. Gilberto
Hewson Donald E.
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