MATTHEW H SMITH, M.D.
Osteopathic Medicine at 2 Ave, Largo, FL

6439763, Aug 27, 2002

Feb 8, 2001

09/780754

Robert S. Roeder - Dunedin FL
Matthew C. Smith - Largo FL
Lawrence P. Dunleavy - Land of Lakes FL
Steven M. Lardizabal - Tampa FL

Raytheon Company - Lexington MA

G01K 730

374 1, 374175, 342351, 342174

A radiometer calibrating system utilizes an adjustable noise source for calibrating a radiometer. The noise source includes a transistor configured as a noise equivalent circuit having a gate port, drain port and source port. A source inductance providing series feedback for the noise source has one end coupled to the source port of the noise equivalent circuit and another end connected to the ground. A bias circuit controls the amount of DC bias applied to the noise equivalent circuit. In order to match the impedances in the noise source, an output impedance matching network is connected to the drain port and an input impedance matching network is connected to the gate port of the noise equivalent circuit. The output and input impedance networks have an output port and input port, respectively. Included in the noise source is a port switch that terminates a matched load to the output port when a cold thermal radiation temperature is generated at the input port, and alternatively, the port switch terminates the matched load to the input port when the warm thermal radiation temperature is generated at the output port.

6750736, Jun 15, 2004

Jul 12, 2002

10/193982

Thomas M. Weller - Lutz FL
Matthew C. Smith - Largo FL
James W. Culver - Seminole FL
Jason N. Naylor - Largo FL

Raytheon Company - Waltham MA

H01P 5107

333 26, 333 33

According to one embodiment of the invention, a planar transmission line transition system includes a coplanar waveguide transmission line that includes a first electrical path and a second electrical path. The planar transmission line transition system also includes a transmission line stub electrically connected in series to the first electrical path of the coplanar waveguide transmission line, wherein a signal output at a first connection of the transmission line stub is phase delayed approximately 180 degrees with respect to a signal input at a second connection of the transmission line stub. The planar transmission line transition system further includes a transmission line electrically connected to the second electrical path of the coplanar waveguide transmission line and the first connection of the transmission line stub.

6657518, Dec 2, 2003

Jun 6, 2002

10/164949

Thomas M. Weller - Lutz FL
Matthew C. Smith - Largo FL
James W. Culver - Seminole FL

Raytheon Company - Lexington MA

H01P 1203

333204, 333202, 333 33, 333133, 385131, 385129, 257453, 257 76, 257245

According to one embodiment of the invention, a notch filter circuit includes a coplanar waveguide that includes a silicon substrate and at least one shunt stub bent at an angle to the coplanar waveguide. The notch filter circuit also includes at least one capacitor bridging at least one discontinuity of the shunt stub.

6137440, Oct 24, 2000

Nov 4, 1997

8/963962

Robert S. Roeder - Dunedin FL
Matthew C. Smith - Largo FL

Raytheon Company - Lexington MA

G01S 302

342351

A microwave active noise source and method used for calibrating a radiometer includes a transistor configured as a noise equivalent model having a gate port, drain port and source port. During calibration of the radiometer the drain port is terminated and a bias circuit applies DC bias to the noise equivalent model. The bias circuit controls the DC bias such that a hot thermal radiation temperature and a cold thermal radiation temperature are alternately generated at the gate port of the noise equivalent model. A source inductance coupled to the source port of the noise equivalent model provides series feedback. To match the impedances in the noise source, an output matching impedance network is connected to the drain port and an input matching impedance network is connected to the gate port of the noise equivalent model. The input matching impedance network includes an input port for outputting the hot and cold thermal radiation temperatures used to calibrate the radiometer.

6217210, Apr 17, 2001

Aug 23, 1999

9/319520

Robert S. Roeder - Dunedin FL
Matthew C. Smith - Largo FL
Lawrence P. Dunleavy - Land of Lakes FL
Steven M. Lardizabal - Tampa FL

Raytheon Company - Lexington MA
University of South Florida - Tampa FL

G01K 1500, G01K 730

374 1

A radiometer calibrating system utilizes an adjustable noise source for calibrating a radiometer. The noise source includes a transistor configured as a noise equivalent circuit having a gate port, drain port and source port. A source inductance providing series feedback for the noise source has one end coupled to the source port of the noise equivalent circuit and another end connected to the ground. A bias circuit controls the amount of DC bias applied to the noise equivalent circuit. In order to match the impedances in the noise source, an output impedance matching network in connected to the drain port and an input impedance matching network is connected to the gate port of the noise equivalent circuit. The output and input impedance networks have an output port and input port, respectively. Included in the noise source is a port switch that terminates a matched load to the output port when a cold thermal radiation temperature is generated at the input port, and alternatively, the port switch terminates the matched load to the input port when the warm thermal radiation temperature is generated at the output port.

8330600, Dec 11, 2012

Nov 29, 2007

11/947650

Robert S. Roeder - Dunedin FL, US
Kenneth A. O'Connor - Sarasota FL, US
Matthew C. Smith - Largo FL, US
Shawn K. O'Brien - St. Petersburg FL, US

Raytheon Company - Waltham MA

G08B 19/00

340552, 2504931, 2504941, 2504951, 2504961, 2504971, 374 1, 374 2, 374 3, 374 18, 342 27, 342 73, 342 74, 342 75, 342 81, 342118, 342147, 342175

In one embodiment, a system includes a first cold noise source, a first radiometer receiver, and a first detector. The first cold noise source generates a first thermal radiation signal having a first carrier frequency band. The first thermal radiation signal carries a first information signal. The first cold noise source also transmits the first thermal radiation signal through a first antenna. The first radiometer receiver receives the first thermal radiation signal through a second antenna, and the first detector extracts the first information signal from the first thermal radiation signal.