Communications: directive radio wave systems and devices (e.g. – Testing or calibrating of radar system
Patent
1998-02-09
1999-12-28
Lobo, Ian J.
Communications: directive radio wave systems and devices (e.g.,
Testing or calibrating of radar system
342 4, H01Q 1700, G01S 740
Patent
active
060087536
ABSTRACT:
A measurement chamber which surrounds a target of interest intersected by a line defined by focal points associated with the measurement chamber and which separates and extracts scattered signals from the measurement chamber, includes a chamber having an interior defined by rotation of a nonlinear curve about the line, and first and second focusing elements which couple the scattered signals out of the measurement chamber. According to one aspect of the invention, the measurement chamber further includes first and second absorbing material sections which absorb the scattered signals, and which are disposed proximate to the distal ends of the first and second focusing elements, respectively. Alternatively, a measurement chamber which surrounds a target of interest disposed on the centerline of the measurement chamber and which separates and extracts scattered signals from the measurement chamber, includes a chamber having an interior defined by rotation of first and second non-linear curves about the centerline, and first and second focusing elements which couple the scattered signals out of the measurement chamber. Preferably, the first non-linear curve is a parabola having a focal point located on the centerline, while the second non-linear curve is a parabola having a focal point offset from the centerline by a predetermined offset distance. A corresponding measurement system is also described.
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Berg Donald J.
Fisher Paul T.
Mentzer Carl A.
Lobo Ian J.
McDonnell Douglas Corporation
Powell, Jr. Raymond H. J.
Westerlund Robert A.
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