1
Steve I Hsu: High spectral purity digital waveform synthesizer. Hughes Aircraft Company, Leonard A Alkov, W K Denson Low, February 27, 1996: US05495202 (99 worldwide citation)

A digital waveform synthesizer, using a direct digital synthesizer and a digital frequency divider. The direct digital synthesizer provides a digitally synthesized input frequency signal. An upconverter and frequency divider circuit upconverts and divides the synthesized input frequency signal to pr ...


2
Irwin L Newberg, Oleg Brovko, Steve I Hsu, Robert A Kosmala, Trung T Nguyen, Ricardo Rico Jr: Phased array antenna system with virtual time delay beam steering. Leonard A Alkov, Glenn H Lenzen Jr, March 4, 2003: US06529162 (14 worldwide citation)

A system and technique for phased array antenna beam steering for transmitting and receiving without sending the waveform through an actual (physical) time delay when a time varying frequency is used as the waveform. The inventive system is adapted for use with an antenna having an array of radiatin ...


3
Steve I Hsu, Stephen D Taylor: Ultra low noise frequency generator producing the sum of plural signal sources. Hughes Electronics, Leonard A Alkov, Wanda K Denson Low, April 29, 1997: US05625324 (13 worldwide citation)

The frequencies of N oscillators are summed to provide a signal generator output signal. Because the phase noise power spectral densities of the oscillators add as power, the frequency summed output exhibits a noise degradation over a single oscillator of only 10 log(N). The signal generator is impl ...


4
Steve I Hsu, Howard S Nussbaum, William P Posey, Stephen D Taylor: Digital frequency divider phase shifter. Hughes Electronics, Leonard A Alkov, Wanda K Denson Low, December 30, 1997: US05703514 (3 worldwide citation)

A phase shifter using digital counters allows extremely accurate phase shifts. In a parallel circuit arrangement of a number of basic phase shift units, which each includes a dual modulus counter and phase control circuitry for controlling the counter modulus, the outputs of several units are combin ...


5
Stephen D Taylor, Steve I Hsu, Howard S Nussbaum, William P Posey: Precision digital phase shifter. Hughes Aircraft Company, Leonard A Alkov, Wanda K Denson Low, July 29, 1997: US05652534 (3 worldwide citation)

A phase shifter that employs digital circuitry to achieve arbitrarily fine phase control of reference signals at frequencies extending to the Gigahertz region. The phase shifter includes a cascade of identical phase shift units that provide progressively finer phase control resolution over a full 36 ...


6
Howard S Nussbaum, William P Posey, Steve I Hsu, Stephen D Taylor: Discrete phase modulator. Hughes Electronics, Leonard A Alkov, Wanda K Denson Low, September 30, 1997: US05673051 (2 worldwide citation)

Discrete phase modulation for modulating the transmit and receive radar signal waveforms in order to control distortion. The signal is modulated by discrete phases which change from pulse-to-pulse. A digital frequency division circuit accurately generates the modulation signals, and allows the discr ...


7
Stephen D Taylor, Howard S Nussbaum, Steve I Hsu, William P Posey: Precision digital phase shift element. Hughes Aircraft Company, Leonard A Alkov, Wanda K Denson Low, July 22, 1997: US05650738 (2 worldwide citation)

A precision digital phase shift element for achieving precise phase shift of an input pulse train signal. The output is a pulse train at a frequency equal to the input signal frequency divided by N, and having N equally spaced phase states. The relative phase state of the output signal is reliably c ...


8
Irwin L Newberg, Oleg Brovko, Steve I Hsu, Robert A Kosmala, Trung T Nguyen, Ricardo Rico: Phased array antenna system with virtual time delay beam steering. Leonard A Alkov Esq, Raytheon Company, November 28, 2002: US20020175859-A1 (1 worldwide citation)

A system and technique for phased array antenna beam steering for transmitting and receiving without sending the waveform through an actual (physical) time delay when a time varying frequency is used as the waveform. The inventive system is adapted for use with an antenna having an array of radiatin ...