Radar

Details Radar Radar

2007-05-22

2007-05-22

Sotomayor, John B. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

With particular circuit

Spectrum analysis

C342S198000

Reexamination Certificate

active

11137330

ABSTRACT:
A radar includes a transmitter circuit, a receiver circuit, an antenna and a circulator. The receiver circuit includes a low-noise amplifier which amplifies a received signal fed from the antenna through the circulator. A local oscillator provided in the receiver circuit generates a local oscillator signal of which frequency is approximately half the frequency of the received signal, and the local oscillator signal is amplified by a buffer amplifier. An even harmonic mixer including an anti-parallel diode pair also provided in the receiver circuit as a frequency converter mixes the received signal output from the low-noise amplifier with the local oscillator signal output from the buffer amplifier to generate and output an intermediate frequency signal.

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