Communications: directive radio wave systems and devices (e.g. – Transmission through media other than air or free space
Reexamination Certificate
2005-12-14
2008-10-07
Lobo, Ian J (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Transmission through media other than air or free space
C342S027000
Reexamination Certificate
active
07432846
ABSTRACT:
A millimeter wave imaging system. The system includes at least one millimeter wave frequency scanning antenna for collecting frequency dependent beams of millimeter wave radiation from a narrow one-dimensional field of view; a millimeter wave amplifier for amplifying at the collected frequencies said millimeter wave radiation. A beam-former separates the amplified radiation to produce frequency dependent signals corresponding to the frequency dependent beam. The beam-former includes delay lines, a millimeter wave lens, and an array of millimeter wave power detectors for detecting the power in each frequency dependent beam. A sampling circuit reads out the frequency dependent signals to produce a one-dimensional image of the antenna field of view. A two dimensional image of a target may be obtained by moving the target across the field of view of the scanning antenna or by moving the antenna in order to scan its line of focus over the target. In preferred embodiments a 2×2 Dicke switch is provided to permit sampling a reference thermal source for gain control while continuing to collect image information. This 2×2 Dicke switch provides a square root of 2 improvement in temperature sensitivity over a single receiver version. Preferred embodiments also include features for focusing the antenna within a range of about 5 feet to infinity.
REFERENCES:
patent: 6937182 (2005-08-01), Lovberg et al.
patent: 7135848 (2006-11-01), Ammar
patent: 7194236 (2007-03-01), Lovberg et al.
patent: 7248204 (2007-07-01), Lovberg et al.
Lovberg John
Martin Chris
Lobo Ian J
Ross John R.
Trex Enterprises Corp.
LandOfFree
Millimeter wave imaging system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Millimeter wave imaging system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Millimeter wave imaging system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3990921