Sam Kam Wong

US Patent:

45557080, Nov 26, 1985

Filed:

Jan 10, 1984

Appl. No.:

6/569642

Inventors:

Douglas K. Waineo - Placentia CA
Sam S. Wong - Yorba Linda CA

Assignee:

The United States of America as represented by the Secretary of the Air
Force - Washington DC

International Classification:

H01Q 2120
H01Q 128

US Classification:

343799

Abstract:

A NAVSTAR satellite has a navigation antenna array beamed toward the earth. A communications antenna array for communicating with other satellites requires a pattern null near the axis and high gain to the sides with minimum losses. This is achieved with a dipole ring array comprising eight elements surrounding the navigation array. The ring has a diameter of 1. 1 wavelength, and is fed with equal amplitudes and a third mode phase progression, which produces good circular polarization in the far field. For a different sized dipole ring, there will still be an optimum phase distribution which will give good circularly polarized patterns.

US Patent:

56753497, Oct 7, 1997

Filed:

Feb 12, 1996

Appl. No.:

8/599914

Inventors:

Sam H. Wong - Yorba Linda CA

Assignee:

Boeing North American, Inc. - Seal Beach CA

International Classification:

H01Q 1502

US Classification:

343910

Abstract:

A radar lens 14 is made from a conventional Fresnel lens 10, but replaces the conventional curved surface 32 with a stepped approximation thereto 22, 24, 26, preferably of three steps. The thickness of the stepped lens 14, at each step, is a half-wavelength or a multiple half-wavelength of the radar operating frequency in the medium of the lens 14. The half-wavelength or multiple half-wavelength separation of the steps 22, 24, 26 causes reflections from the front 16 and rear 18 surfaces to cancel, thereby minimizing the (undesirable) standing wave between the lens 14 and the feed horn or feed horns 46, 48, 50. This avoids the necessity of reducing the standing wave by presenting the curved or stepped side 18 forward. The planar side 16 of the lens 14 (unlike the stepped side 18) doesn't need to be protected from road debris. The lens 14 can therefore be molded as an integral unit of a radome, desirable in the automotive setting.

US Patent:

55171974, May 14, 1996

Filed:

Oct 24, 1994

Appl. No.:

8/327747

Inventors:

Jerry A. Algeo - Villa Park CA
Douglas K. Waineo - Placentia CA
Pileih Chen - Huntington Beach CA
Sam H. Wong - Yorba Linda CA
Russell H. Linstrom - Fullerton CA

Assignee:

Rockwell International Corporation - Seal Beach CA

International Classification:

G01S 1302

US Classification:

342 70

Abstract:

A modular radar system using both FM/CW and pulse waveforms for automotive collision avoidance applications. The radar system comprises a transmit and a receive antenna for transmitting and receiving, respectively, either one of FM/CW waveform and pulse waveform, a voltage-controlled oscillator (VCO) for generating a pre-set waveform for the transmit antenna, a modulator for modulating the pre-set waveform of the VCO, a switch for allowing the pre-set waveform from the VCO to be transmitted for a predetermined interval so as to generate the pulse waveform, a timing generator for causing the modulator to execute through a pre-set sequence of frequencies for either one of the pulse and FM/CW modes of waveforms with the timing generator controlling the transmission of one of the FM/CW waveform and pulse waveform, a balanced mixer for signal conversion In both FM/CW and pulse modes, an IF/Baseband receiver for amplifying the received FM/CW waveform and for IF-amplifying the received pulse waveform to generate an in-phase and a quadrature baseband output, a coherent oscillator for generating a coherent oscillating signal of a predetermined frequency to the receiver for centering the IF-amplified received pulse waveform at the predetermined frequency during pulse mode, and a frequency control loop for causing the VCO to maintain an offset by a predetermined frequency in the pulse mode between receive and transmit.

US Patent:

54812232, Jan 2, 1996

Filed:

Sep 13, 1994

Appl. No.:

8/305245

Inventors:

Sam H. Wong - Yorba Linda CA

Assignee:

Rockwell International Corporation - Seal Beach CA

International Classification:

H03F 368

US Classification:

330124R

Abstract:

A bi-directional spatial power combiner grid amplifier has an array of parasitic elements between the lens and the amplifier. The elements have different impedances to radiation of a first polarization (incident radiation) and of a second polarization which is orthogonal to the first (amplified radiation), thereby providing impedance matching to both the input and the output of the grid amplifier. The elements preferably are separated slots or dipoles (some in each direction of polarization), crossed slots or dipoles, or micropatches.

US Patent:

6005512, Dec 21, 1999

Filed:

Jun 16, 1998

Appl. No.:

9/098409

Inventors:

Sam H. Wong - Yorba Linda CA

Assignee:

Boeing North American, Inc. - Seal Beach CA

International Classification:

G01S 1344

US Classification:

342 80

Abstract:

A radar system and method for obtaining low sum and difference side lobe patterns from a phased array antenna comprising radiators distributed amongst four quadrants A, B, C, and D. The quadrants are arranged in a clockwise order of A, B, D, and C. Each quadrant is further divided into an inner portion and an outer portion. The monopulse sum pattern is determined by adding signals received by radiators in the A quadrant, B quadrant, C quadrant, and D quadrant. The elevation difference pattern is determined by subtracting a CD sum consisting of signals received by radiators in the C outer portion and the D outer portion from an AB sum consisting of signals received by radiators in the A outer portion and the B outer portion. The azimuth difference pattern is determined by subtracting a BD sum consisting of signals received by radiators in the B outer portion and the D outer portion from an AC sum consisting of signals received by radiators in the A outer portion and the C outer portion.

US Patent:

54337178, Jul 18, 1995

Filed:

Mar 23, 1993

Appl. No.:

8/035455

Inventors:

Boris Rubinsky - Albany CA
John Gilbert - Berkeley CA
Sam Wong - Emeryville CA
Mark Roos - San Francisco CA
Grant Pease - Oakland CA

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

A61B 1736

US Classification:

606 20

Abstract:

Methods and apparatus for magnetic resonance imaging (MRI) assisted cryosurgery. Optimal probe placements and cooling parameters are calculated prior to cryosurgery using MRI data. A MRI compatible cryoprobe and a stereotactic probe positioning device are provided. The resolution of MR images is enhanced by mounting a radio frequency MR coil on the intracorporeal end of a cryoprobe. During cryosurgery the temperature distribution in the frozen region is solved by determining the boundary of the frozen region and solving the heat equation for the known boundary conditions. During cryosurgery the temperature distribution in the unfrozen region is determined by T1 measurements. The process of freezing is controled using information from the solution of the energy equation in the frozen region and temperature measurements in the unfrozen region. After cryosurgery the extent of the tissue damage may be ascertained using phosphorus-31 and/or sodium-23 spectroscopy with a special coil set on the cryosurgical probe.

US Patent:

59915463, Nov 23, 1999

Filed:

Aug 29, 1997

Appl. No.:

8/906775

Inventors:

Teh-Hsin Philip Chan - Irvine CA
Mike Ching-Hsing Chen - Irvine CA
Arthur Kent Hargrove - Irvine CA
Scot Chuen Leung Hui - West Covina CA
Jason Jzhong Lee - La Habra CA
Brian Chien Hun Lin - Laguna Niguel CA
Sam Chien-Shin Lin - Rancho Santa Margarita CA
Raymond Cheng-Yu Liu - Laguna Niguel CA
Victor Moon-Fai Siu - Huntington Beach CA
Sam An Wong - Orange CA

Assignee:

CMD Technology, Inc. - Irvine CA

International Classification:

G06F 1300

US Classification:

395882

Abstract:

A system and method for interfacing peripheral devices to a computer universal serial bus is disclosed. The system is adaptable to a wide variety of peripheral devices and features a user-configurable serial EEPROM coupled to the interface in which vendor specific data can be stored for use by the interface. Interface parameters may also be selected by an externally controllable configuration switch.

US Patent:

52143945, May 25, 1993

Filed:

Apr 15, 1991

Appl. No.:

7/685104

Inventors:

Sam H. Wong - Yorba Linda CA

Assignee:

Rockwell International Corporation - Seal Beach CA

International Classification:

H03F 36
H01Q 2300

US Classification:

330286

Abstract:

The present invention is a high efficiency bi-directional spatial power combiner for extremely high frequency signals. In one embodiment, orthogonally polarized electro-magnetic waves are used to isolate signals going into and out of a planar array of amplifiers. A dual mode horn transmits vertically polarized fields to a MMIC planar array of amplifiers. Vertically polarized array elements receive the signals, amplify them, and retransmit back to the horn using horizontally polarized array elements. An ortho-mode transducer on the horn provides isolation for the two polarized signals. The backside of the array can be used for a heat sink, and to provide access for DC biasing of the array elements. In a second embodiment, monolithic grid oscillators are used in lieu of power amplifiers with orthogonal polarization array elements. The input signal and the output signal are of the same polarization.