Communications: directive radio wave systems and devices (e.g. – Transmission through media other than air or free space
Reexamination Certificate
2000-10-31
2002-06-11
Gregory, Bernarr E. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Transmission through media other than air or free space
C342S021000, C343S705000, C343S767000
Reexamination Certificate
active
06404377
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention relates to radar systems, and more particularly to a radar antenna suited for foliage penetration.
BACKGROUND OF THE INVENTION
The Government has a requirement for an ultra wide band foliage penetration antenna for a radar to detect targets concealed in a forest. The antenna requirements include 1) ultra wide band, 4:1 ratio UHF frequencies, 2) compact, to fit in a very shallow (50 cm) radome mounted in the belly of an aerial surveillance vehicle, 3) dual linear polarizations, V- and H-polarization, 4) well matched to have an input VSWR less than 2:1 over 90% of the band, 5) side-looking beam pointed at 30-degree depression angle, 60 degree from the nadir, and 6) high power, at relatively high altitudes.
This invention is addressed to this particular application, although the invention can be employed in other applications.
SUMMARY OF THE INVENTION
A radar antenna is described, and includes a vertical polarization subarray of vertical polarization radiating elements, including a first plurality of vertical polarization element slabs each carrying a second plurality of the vertical polarization radiating elements. The antenna also includes a horizontal polarization subarray of horizontal polarization radiating elements, including a third plurality of horizontal polarization element slabs each carrying a fourth plurality of the horizontal polarization radiating elements. The vertical polarization element slabs and the horizontal polarization element slabs are interleaved into generally transverse spaced relation to provide a reticulated compartmented structure.
REFERENCES:
patent: 5206655 (1993-04-01), Caille et al.
patent: 5334981 (1994-08-01), Smith et al.
patent: 5428364 (1995-06-01), Lee et al.
patent: 5900843 (1999-05-01), Lee
IEEE Transactions on Microwave Theory and Techniques, vol. 39, No. 4, Apr. 1991, Slotline Impedance by J.J. Lee, Senior Member, IEEE; pp. 666-672.
Lee Jar J.
Livingston Stan W.
Alkov Leonard A.
Gregory Bernarr E.
Lenzen, Jr. Glenn H.
Raytheon Company
LandOfFree
UHF foliage penetration radar antenna does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with UHF foliage penetration radar antenna, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and UHF foliage penetration radar antenna will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2973760