Emmanuel J Perrotti

20090077872, Mar 26, 2009

Sep 26, 2008

12/238542

Lawrence E. Faria - Kingston NH, US
Emmanuel J. Perrotti - Ramsey NJ, US
David R. Sar - Corona CA, US

H05B 6/80
A01G 13/06
H05B 6/72
H01Q 1/44

47 2, 219748

A system for preventing freezing of crops within a volume includes a plurality of RF radiators configured to radiate RF energy into the volume. A height, a spacing, an output power, a vertical beam angle, a vertical beam width, and a horizontal beam width of each one of the plurality of RF radiators is selected to result in an average RF power density taken about three dimensions within the volume sufficient to prevent freezing of a substantial portion of the crops, and also to result in a peak-to-peak variation of RF power density taken about two dimensions in a horizontal plane within the volume and at heights below a predetermined height to be less than a predetermined percentage of an average RF power density taken about the two dimensions.

41329929, Jan 2, 1979

Sep 19, 1977

5/834093

Emmanuel J. Perrotti - Ramsey NJ

International Telephone and Telegraph Corporation - Nutley NJ

C01R 2908

343100PE

The circuit includes a receiving circularly polarized crossed slot waveguide antenna having a longitudinal axis and spaced crossed slots disposed on a selected side of said axis spaced therefrom; and a broadband matched magic "TEE" hybrid having an output difference port, an output sum port, a first input port coupled to the receiving antenna to receive therefrom left-hand circularly polarized waves and a second input port coupled to the receiving antenna to receive therefrom right-hand circularly polarized waves. A microwave meter is coupled to the difference port to detect the value of the difference (. DELTA. ) of the waves coupled to the first and second input ports and another microwave meter coupled to the sum port to detect the value of the sum (. SIGMA. ) of the waves coupled to the first and second input ports to enable solving the equation R = 20 log. SIGMA. /. DELTA. to obtain the value R of the radiation axial ratio.

42662281, May 5, 1981

Feb 12, 1979

6/011268

Emmanuel J. Perrotti - Ramsey NJ

International Telephone and Telegraph Corporation - New York NY

H01Q 1310

343771

The array includes at least a first pair of waveguides disposed side by side and a first plurality of crossed slots disposed in each of the first pair of waveguides with the slots of one of the first pair of waveguides being axially displaced from the slots in the other of the first pair of waveguides one half of the waveguide wavelength. For transmission, both extremities of one of the pair of waveguides are excited out of phase with respect to both extremities of the other of the pair of waveguides to produce in-phase excitation of the slots. To receive, a waveguide is disposed in the central area of each of the first pair of waveguides. The array may be enlarged by placing additional identical pairs of waveguides disposed side by side with respect to each other and the first pair of waveguides. The additional pairs of waveguides contain additional slots identical to the first plurality of slots.