Patent ID: 6617995
Filing Date: 2003-09-09
Classification: G01S

Abstract:
A radar detector, comprising:an antenna for receiving a first signal of ultrahigh-frequency; a first local oscillator oscillating a second signal; a first filter removing noise from the second signal oscillated via the first local oscillator; a first mixer mixing the first signal of ultrahigh-frequency with a third signal filtered via the first filter; an intermediate frequency amplifier amplifying a fourth signal mixed at the first mixer; a second local oscillator oscillating a fifth signal; a second mixer mixing a sixth signal amplified via the intermediate frequency amplifier with the fifth signal oscillated by the second local oscillator; a second filter filtering a seventh signal mixed at the second mixer; a demodulator converting analog values of an eighth signal filtered by the second filter into digital values; a memory part storing data of relations between a ninth signal converted via the demodulator and the second and fifth signals oscillated by the first and second local oscillators; a central processing unit controlling the first and second local oscillators, and obtaining a result by comparing the ninth signal converted via the demodulator with the data of the memory part; and an indicator showing a user the result obtained by the central processing unit, wherein the first mixer is made of a transistor including a gate terminal getting the first signal of ultrahigh frequency received via the antenna, a drain terminal receiving the third signal, and a source terminal being groundedâ€”to clear up a lack of antecedent basis problem.