Charles E Schmidt

US Patent:

47664371, Aug 23, 1988

Filed:

Jan 9, 1987

Appl. No.:

7/002060

Inventors:

Charles J. Schmidt - Riverdale NJ
Victor J. Albanese - Valley Stream NY

Assignee:

Grumman Aerospace Corporation - Bethpage NY

International Classification:

H01Q 322
H01Q 324
H01Q 326

US Classification:

342368

Abstract:

Antenna apparatus for changing the antenna radiation pattern includes a transmitter and first and second antenna members. Each antenna member has a plurality of antenna elements which are arranged such that the elements of each antenna member are exponentially amplitude fed. A directional coupler responsive to the transmitter divides the power from the transmitter between the first and second antenna members such that each antenna member is provided with a signal of equal amplitude and phase. A variable phase shifter connected between the directional coupler and one of the antenna members is selectively operable either at 0. degree. , or at a predetermined value in the range of about 60. degree. to 120. degree. A symmetrical pencil beam pattern is provided when the variable phase shifter is set at 0. degree. , and a cosecant squared pattern is provided when the variable phase shifter is set at a value in the range of about 60. degree. to 120. degree.

US Patent:

40231720, May 10, 1977

Filed:

Dec 17, 1959

Appl. No.:

3/860289

Inventors:

Charles J. Schmidt - Bergenfield NJ

Assignee:

Numax Electronics Incorporated - Hauppauge NY

International Classification:

G01S 332
G01S 922

US Classification:

343 16M

Abstract:

1. A radio receiving system comprising a directional antenna having a boresight axis and a pair of main antenna feed horns equally spaced from and normal to said axis, with an auxiliary pair of similar antenna feed horns disposed in alignment with the main pair and spaced farther from said axis, a multiple channel receiver, first feed means connecting a first channel of said receiver to the main pair of said antenna feed horns for providing a first output said first output having a radiation receiving pattern including a desired main lobe and undesired side lobes, second feed means connected to said auxiliary pair of antenna feed horns, and means in said receiver connected to said second feed means for providing a second output, said second output having a directional receiving pattern which is greater than said radiation pattern at all angles beyond those defining a central portion of the main lobe, and means for obtaining a signal output from said receiver in response to the difference between said first and second outputs.

US Patent:

44504489, May 22, 1984

Filed:

Aug 28, 1981

Appl. No.:

6/297181

Inventors:

Victor J. Albanese - Valley Stream NY
Charles J. Schmidt - Islip NY

Assignee:

Grumman Aerospace Corporation - New York NY

International Classification:

G01S 316
G01S 328

US Classification:

343379

Abstract:

An apparatus and method for use in an n-element electronically scannable array antenna provides a notched auxillary radiation pattern for use in reducing interference energy received in the sidelobes of the antenna's main radiation pattern. The apparatus includes circuitry for feeding the antenna elements in series from one end of the array to the opposed end thereof. Each antenna element is fed through a directional coupler which is responsive to its associated antenna element along with the downstream antenna elements in the array. The directional couplers provide a first output signal for forming a primary radiation pattern. At least one directional coupler also provides a second output signal on receive for forming an auxiliary radiation pattern having a notch in the direction of the primary radiation pattern main beam and electronically steerable therewith, and a relatively uniform response in all other directions. The first and second outputs may be fed to a combining circuit for cancelling or blanking the signal appearing in the sidelobes of the primary radiation pattern.

US Patent:

49857070, Jan 15, 1991

Filed:

Jan 9, 1989

Appl. No.:

7/294716

Inventors:

Charles J. Schmidt - River Vale NJ
Joseph Kadin - Florham Park NJ
S. Eugene Poteat - McLean VA

Assignee:

BroadCom, Inc. - Mahwah NJ

International Classification:

H01Q 100
H04B 700

US Classification:

342370

Abstract:

Communications link using the ionized trail of a meteor entering the atmosphere at an altitude of approximately 100 kilometers as reflectors to relay radio frequency energy beyond the horizon using a retrodirective adaptive loop. The retrodirective adaptive loop includes a plurality of conjugate antenna elements, with each conjugate antenna element having a spatial servo-loop circuit. At least two stations having antennas with conjugate elements are required for generating a retrodirective oscillating or phase locked loop.