Radar system using quadrature signal

Details Radar system using quadrature signal Radar system using quadrature signal

2006-07-04

2006-07-04

Gregory, Bernarr E. (Department: 3662)

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

With particular circuit

Complex signal

C342S021000, C342S070000, C342S082000, C342S175000

Reexamination Certificate

active

07071869

ABSTRACT:
A radar system using a quadrature signal includes a quadrature push—push oscillator for generating four harmonics with a 90-degree phase difference from each other, and producing two-balanced 2ndharmonic signals from the harmonics; a first coupler block for radiating one of the 2ndharmonics through an antenna; a second coupler block for terminating the other 2ndharmonic to ground; and a power combiner for combining a transmitted signal that is leaked from the first and second coupler blocks with the received signal that is radiated through the antenna. The radar system features an improved receiving sensitivity by offsetting the leakage signals of the sending end. Also, the radar system can be made very small by using a single antenna for transmitting and receiving.

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patent: 1999-0069498 (1999-09-01), None
patent: 2001-0005341 (2001-01-01), None
M. Schott et al., “Low Phase Noise X-Band Clapp Push-Push Oscillator”; no date given; no publication given.

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