Leonard O Ruvinsky

US Patent:

20080024373, Jan 31, 2008

Filed:

Aug 5, 2005

Appl. No.:

11/596137

Inventors:

Mahmood Khosravi - Bedford NH, US
Robert Lombardi - Nashua NH, US
Donald Spencer - Merrimack NH, US
Leonard Ruvinsky - Merrimack NH, US
Michael Freeman - Franklin NH, US

International Classification:

G01R 29/08

US Classification:

343703000

Abstract:

An antenna and its associated components are consolidated in a small measurement box, and multiple tests are competed simultaneously, with a single vector network analyzer. This can be done by treating the “Far Field” measurements (typically measured on antenna/RCS ranges) as another port of a larger passive network. After characterization of one ideal “gold” unit (or a sample set of “gold” units), the S-parameters of subsequent units are measured in the same passive test box environment. The results of these subsequent tests are compared to the results of the “gold unit's” test, and if they are repeated to within some tolerance, electrical similarity can be proven.

US Patent:

20130063321, Mar 14, 2013

Filed:

Aug 27, 2012

Appl. No.:

13/595470

Inventors:

Leonard Ruvinsky - Merrimack NH, US
Zane Lo - Merrimack NH, US
Mark W. Reed - Manchester NH, US
Patrick McKivergan - Londonderry NH, US

International Classification:

H01Q 13/18

US Classification:

343771

Abstract:

An octave bandwidth conformal cavity-backed slot antenna includes a ground plane with a number of different length slits that come together at the central feedpoint. The slit length varies from one-half a wavelength at the highest frequency at which the antenna is to operate for the short side to one wavelength at the highest frequency for the long side, with the proximal ends of the slits having a common feedpoint. Such slot antennas may be arrayed in a quad configuration. Because the trapezoidal envelope of the antenna induces the phase-center to shift with frequency, when two are arrayed with short sides adjacent, the spacing between them results in a phase center from one antenna to the next that is effectively within half a wavelength at all frequencies.