Steven S Chan

6525650, Feb 25, 2003

Jun 11, 1999

09/330335

Steven S. Chan - Alhambra CA
George M. Hayashibara - Los Angeles CA
Davie C. Liu - Rancho Palos Verdes CA

TRW Inc. - Redondo Beach CA

H04Q 522

340 1469, 340 141, 340 142, 340 22, 340 221, 340 227, 455103, 4552771, 455562

A high density electronic switching matrix (ESM) includes several splitting modules ( ) arranged along a first axis, each including a signal input ( ) and several splitter outputs ( ). The ESM ( ) further includes several switching modules ( ) arranged along a second axis perpendicular to the first axis. Each switching module ( ) includes switching inputs ( ) coupled individually to an output of each of the splitting modules ( ). The ESM ( ) is further characterized by couplings between the splitter modules and the switching modules. The couplings are formed by mating male and female connectors ( ) integrated into the splitting modules and the switching modules. The couplings support extremely high frequency operation. The splitting modules ( ) and the switching modules ( ) may thus be coupled closely together to form a dense, high frequency, switching matrix, and may be stacked upon one another.

6897739, May 24, 2005

Mar 13, 2003

10/387717

Steven S. Chan - Alhambra CA, US
Paul S. Lee - La Palma CA, US

Northrop Grumman Corporation - Los Angeles CA

H01P005/12

333127, 333113, 333137

A compact inline waveguide power divider is provided that comprises a primary waveguide in communication with two parallel waveguides. The two parallel waveguides are stacked on top of one another and each parallel waveguide further comprises an output port. Accordingly, an input signal is transmitted through the primary waveguide and split between the two parallel waveguides. A resistive slot is formed in each of the parallel waveguides, thereby increasing output port isolation through dissipation of reflected power from one output port to the other. Further, a stepped or tapered impedance transformation is applied in each parallel waveguide to provide wide band frequency matching. Alternately, the primary waveguide and the parallel waveguides may be configured as a waveguide power combiner rather than a divider, wherein the parallel waveguides comprise input ports and the primary waveguide comprises an output port.

7053847, May 30, 2006

Aug 11, 2004

10/917986

Steven S. Chan - Alhambra CA, US
Te Kao Wu - Rancho Palos Verdes CA, US
Arun Bhattacharyya - El Segundo CA, US
Juan Rivera - Torrance CA, US
Phillip L. Metzen - Hermosa Beach CA, US

Northrop Grumman Corporation - Los Angeles CA

H01Q 13/12
H01Q 13/10

343769, 343770

A phased array antenna structure capable of operation at millimeter-wave frequencies and having multiple ring slot radiator elements (). The RF feed structure for each radiator element includes a feed via () extending part-way through a multi-layer structure () on which the radiator elements () are formed and a strip line feed probe () extending from the via () toward the radiator element. A key feature facilitating high-frequency operation is the inclusion of multiple mode suppressors () surrounding the via () and providing a smooth transition from a coaxial mode of RF transmission to a strip line mode of RF transmission. The feed probe () is tailored to provide either a narrow-band or a wideband frequency characteristic.

7432780, Oct 7, 2008

Nov 23, 2005

11/287414

Steven S. Chan - Alhambra CA, US
Te Kao Wu - Rancho Palos Verde CA, US

Northrop Grumman Corporation - Los Angeles CA

H01P 5/12
H03H 7/48

333127, 333132, 333135, 333137

A rectangular-to-circular mode combiner/divider is provided. In one aspect of the invention, a power combiner is provided that comprises a plurality of rectangular waveguide ports arranged in an integral arrangement. Each rectangular waveguide port is operative to operate in a rectangular mode. The power combiner is also includes a circular waveguide port operative to operate in a circular mode, and a transition body that couples the plurality of rectangular waveguide ports to the circular waveguide port. The transition body has an inner transition cavity and an outer body operative to convert radio frequency (RF) signals between the rectangular mode and the circular mode, and provide a combined output signal at the circular waveguide port from RF signals received at the plurality rectangular waveguide ports.

7844253, Nov 30, 2010

Oct 19, 2007

11/875803

Steven S. Chan - Fremont CA, US
George C. Huang - Los Altos Hills CA, US

Future Dial Inc. - Sunnyvale CA

H04M 1/66

455410, 455301, 4555755, 455106, 135139

A method and apparatus to use a shielded enclosure for exchanging secure data. One embodiment comprises an enclosure formed of electromagnetically shielding material that prevents an electromagnetic field from entering an interior of the enclosure or emitting from the interior of the enclosure, the enclosure sized to house a mobile electronic device; a receiver within an interior of the enclosure to receive data transferred wirelessly from a mobile electronic device placed within the enclosure; and a hardware interface having a first end external to the enclosure and a second end within the interior of the enclosure and coupled to the antenna, the hardware interface to transfer data wirelessly received by the receiver to a separate device exterior to the enclosure.

20020174436, Nov 21, 2002

Dec 17, 2001

10/025849

George Wu - Oakland CA, US
Steven Chan - San Francisco CA, US
Ronald Tamura - Fremont CA, US
Elizabeth Shoemaker - Fostser City CA, US
Tze-Yee Szeto - Santa Cruz CA, US

H04N007/173

725/087000, 725/101000

A system for providing on demand responses to consumer impulses produced by a demand stimulus includes a computer processing system and content databases accessible by the computer-processing system having stored stimulus responses corresponding to a plurality of consumer demand stimuli in at least two categories of demand stimuli. A real-time inquiry response system associated with the computer processing system receives inquiries provided by a consumer and identifies the content category with which the consumer inquiry is associated. The computer processing system correlates consumer inquiries received by the real-time inquiry response system with stimulus responses stored in the content database based on the content category identified by the inquiry response system, so that the real-time consumer response system can return to the consumer, in real time, a stored stimulus response which correlates to the consumer inquiry. Categories of demand stimuli can include broadcast and non-broadcast information, and can include a variety of information categories or sub-categories such as music, advertisements, and scheduled events in respect to which a consumer may desire information or make a purchase.

20050020303, Jan 27, 2005

May 12, 2004

10/844771

Steven Chan - Fremont CA, US

H04M001/00

455556100

A mobile communication device including an integrated stylus input unit to input data into the device, and an interface to wirelessly transmit data. In one embodiment, the integrated stylus is a handwriting stylus input device to input data by moving the stylus over a substantially flat surface. In one embodiment, the stylus includes a motion sensor embedded in an antenna extending from the device.

47376708, Apr 12, 1988

Nov 9, 1984

6/670454

Steven S. Chan - Fremont CA

LSI Logic Corporation - Milpitas CA

H03K 513

307602

A circuit (40) constructed in accordance with this invention includes a ring oscillator (25) to provide a signal which is dependent on the propagation delays of the inverters (33, 34, 35) comprising the ring oscillator, therefore the frequency of the ring oscillator is inversely dependent upon the propagation delays of the inverter comprising the ring oscillator. Means (37) are provided to determine the propagation delay introduced by the components in the ring oscillator by measuring the frequency of the output signal produced by the ring oscillator which provides a signal to a multiplexer (36) which selects among a number of preset delay components (26) those components which are necessary to ensure that the propagation delay caused by the circuitry (not shown) connected to the input lead (21) of the circuit constructed in accordance with this invention plus the propagation delay introduced by the selectable delay elements is nearly a constant propagation delay.