Daniel Edward Ko, 57Tamuning, GU

6452464, Sep 17, 2002

Jul 27, 1992

07/920411

Daniel K. Ko - Monterey Park CA
Edward M. Garber - Los Angeles CA
Scott R. Olson - Long Beach CA
Dwight Christopher Streit - Long Beach CA

TRW Inc. - Redondo Beach CA

H01L 4108

333155, 333150, 333194, 257183, 257245, 310313 R

An acoustic charge transport device is formed by a process which introduces a process dependent variation in charge carrier density within the device. The acoustic charge transport device includes a transport channel operable to carry charge carriers in response to a surface acoustic wave. In addition, the acoustic charge transport device further includes a backgate for controlling the charge carrier density within the transport channel.

6690247, Feb 10, 2004

Feb 5, 1999

09/245609

Mark Kintis - Manhattan Beach CA
Daniel K. Ko - Monterey Park CA
Flavia S. Fong - Buena Park CA
Stephen A. Maas - Long Beach CA

Northrop Grumman Corporation - Los Angeles CA

H03K 336

333 20, 307106, 327181

A nonlinear transmission-line waveform generator for generating a comb of frequencies and relatively short duration pulses, for example, in the range of picoseconds and tens of picoseconds, that are adapted to being utilized with ultra wideband radios in order to improve the bandwidth of such radios by an order of magnitude, for example, up to tens and even hundreds of GHz. In particular, the nonlinear transmission line waveform generator in accordance with the present invention consists of a microstrip or coplanar waveguide line. In accordance with an important aspect of the invention, the C/V characteristic of the nonlinear transmission line is matched to the frequency and amplitude of the input sinusoidal waveform. By matching the C/V characteristics of the nonlinear transmission line to the input sinusoidal waveform, the output of the nonlinear transmission line produces a comb of frequencies that are multiples of the input sinusoidal waveform frequency, making it suitable as a harmonic generator. The nonlinear transmission line can also be used to generate relatively short duration pulses by disposing a shorting stub at the output.

6946927, Sep 20, 2005

Nov 13, 2003

10/705870

Barry Ross Allen - Rolling Hills Estates CA, US
Daniel Kwok-hung Ko - Arcadia CA, US
David Joseph Brunone - Rancho Palos Verdes CA, US

Northrup Grumman Corporation - Los Angeles CA

H01P003/08

333116

A low loss suspended substrate coupler includes a substrate having a first transmission line disposed on a topside of the substrate and a second transmission line disposed on the bottom side of the substrate, thereby providing broadside transmission line coupling. To provide closer mode velocity matching, the coupler has capacitive loading or coupling to ground at discrete intervals between the two transmission lines. The capacitive loading is formed by integrating stubs in each transmission line at pre-determined intervals, each of which is opposite a corresponding one of a plurality of ground stubs on the other side of the substrate. The ground stubs are connected to ground at the outer edge of the coupler area with substrate vias or directly to the coupler housing.

5952765, Sep 14, 1999

Nov 26, 1996

8/756846

Edward M. Garber - Los Angeles CA
Daniel K. Ko - Monterey Park CA
David A. Slavin - Louisville CO

TRW Inc. - Redondo Beach CA

H01L 4108

310313B

A relatively narrow fractional bandwidth saw filter formed on a standard ST cut of quartz. The electrode pattern is modified in order to eliminate distortion. In particular, the overlap pattern is formed with one or less active overlaps per wavelength in those regions of the SAW filter where the weighing function is maximum. A plurality of six finger/. lambda. electrode patterns with two active overlaps per wavelength is also provided.

6051908, Apr 18, 2000

Mar 19, 1999

9/273126

Edward M. Garber - Los Angeles CA
Daniel K. Ko - Monterey Park CA
David A. Slavin - Louisville CO

TRW Inc. - Redondo Beach CA

H01L 4108

310313B

A relatively narrow fractional bandwidth saw filter formed on a standard ST cut of quartz. The electrode pattern is modified in order to eliminate distortion. In particular, the overlap pattern is formed with one or less active overlaps per wavelength in those regions of the SAW filter where the weighing function is maximum. A plurality of six finger/. lambda. electrode patterns with two active overlaps per wavelength is also provided.

6320480, Nov 20, 2001

Oct 26, 1999

9/426619

Mark Kintis - Manhattan Beach CA
Daniel K. Ko - Monterey Park CA
Stephen A. Maas - Long Beach CA

TRW Inc. - Redondo Beach CA

H04B 304
H01P 118

333156

A programmable phase shifter (20, 40, 54, 60, 62) includes a variable delay line formed from a nonlinear transmission line (NLTL) (26, 28, 46, 28), which enables the device to be used in applications where the frequency of the input signal varies. A variable DC bias applied to the NLTL (26, 28, 46, 48) varies the NLTL's phase velocity and delay. Since the characteristic impedance of a transmission line changes as a function of the DC bias, the input voltage standing wave ratio (VSWR) also changes. In order to compensate for the change in the input VSWR, a pair of NLTLs (26, 28, 46, 48) are coupled at the input and output to a pair of hybrid couplers (22, 42). In an alternate embodiment of the invention, the hybrid couplers (22, 24) are replaced with 180. degree. power splitters (42, 44) in order to reduce distortion of the device. In other embodiments of the invention (40, 54), a nonlinear transmission lines are used to form both discretely variable and continuously variable digital phase shifters (60, 62).