Radar detector/security device for automobiles
First Claim
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1. A car radar detector/security device comprising:
- a horn antenna structure provided with local oscillation means, a horn antenna that radiates a local oscillation frequency from the local oscillation means to the outside and receives radar waves from the outside, and a mixing chamber leading from said horn antenna, said horn antenna structure comprising means to output an intermediate frequency signal as a result of mixing in the mixing chamber an applied frequency signal with said radar wave detected by the horn antenna, means to detect a frequency signal that is reflected from a dielectric body of said local oscillation frequency radiated to the outside via said horn antenna, and means to output a low frequency signal which is a beat of said local oscillation frequency and said feedback frequency signal reflected from said dielectric body which has undergone a Doppler shift produced by the motion of said dielectric body;
a radar wave detection circuit that detects said intermediate frequency signal output from said horn antenna structure with the detection of said radar wave and operates a warning means;
a security circuit that detects said low frequency signal that is the beat component produced by said feedback frequency signal and operates an annuniciating means; and
a mode switching means for selecting either the radar detection circuit or the security circuit.
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Abstract
A radar detector/security device for cars in which the antenna structure of a radar wave detection circuit that drives a warning means when a radar wave is detected is utilized to radiate a local oscillation signal and receive a signal reflected from a dielectric body. The Doppler shift produced by the movement of the dielectric body is detected as a beat component of the local oscillation signal. This beat component causes an incorporated security function to activate a security circuit. The radar detection circuit or the security circuit can be selectively utilized.
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Citations
4 Claims
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1. A car radar detector/security device comprising:
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a horn antenna structure provided with local oscillation means, a horn antenna that radiates a local oscillation frequency from the local oscillation means to the outside and receives radar waves from the outside, and a mixing chamber leading from said horn antenna, said horn antenna structure comprising means to output an intermediate frequency signal as a result of mixing in the mixing chamber an applied frequency signal with said radar wave detected by the horn antenna, means to detect a frequency signal that is reflected from a dielectric body of said local oscillation frequency radiated to the outside via said horn antenna, and means to output a low frequency signal which is a beat of said local oscillation frequency and said feedback frequency signal reflected from said dielectric body which has undergone a Doppler shift produced by the motion of said dielectric body; a radar wave detection circuit that detects said intermediate frequency signal output from said horn antenna structure with the detection of said radar wave and operates a warning means; a security circuit that detects said low frequency signal that is the beat component produced by said feedback frequency signal and operates an annuniciating means; and a mode switching means for selecting either the radar detection circuit or the security circuit. - View Dependent Claims (2, 3, 4)
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Specification