Location History:
- Hacienda Heights, CA (US) (1976)
- Rancho Palos Verdes, CA (US) (1983)
Company Filing History:
Years Active: 1976-1983
Title: The Innovations of Lloyd T. Yuan
Introduction
Lloyd T. Yuan is a notable inventor based in Hacienda Heights, CA (US). He has made significant contributions to the field of semiconductor devices, holding a total of 2 patents. His work focuses on high-frequency applications, showcasing his expertise in advanced technology.
Latest Patents
One of his latest patents is the "Active High Frequency Semiconductor Device with Integral Waveguide." This invention describes an active semiconductor device, such as a Gunn effect device, capable of operation at extremely high frequencies. It is fabricated in situ on a substrate that also serves as a dielectric waveguide to propagate energy from the device. The Gunn effect diode is formed on a substrate of gallium arsenide (GaAs), along with a cavity region and a metalized heat sink layer, allowing for operation at relatively high power levels. A bias current is applied through a conductive strip and then through the cavity region to the diode, with a quarter-wave choke provided in the conductive strip to prevent transmission of radio-frequency energy back along the strip.
Another significant patent is the "Broadband Waveguide Mixer." This invention is suitable for microwave and millimeter wave regions and features a unique dual-guide mixer mount with two parallel and spaced waveguides. The RF wave and the local oscillator wave are impressed on the two waveguides via a hybrid coupler. A pair of crossbars extends through each waveguide, with diodes connected back-to-back in each waveguide. The output is derived from a coaxial cable connected to the adjacent ends of the two crossbars, ensuring low noise and broadband performance.
Career Highlights
Lloyd T. Yuan is currently employed at TRW Limited, where he continues to innovate in the field of semiconductor technology. His work has had a lasting impact on the industry, particularly in high-frequency applications.
Collaborations
Throughout his career, Lloyd has collaborated with notable colleagues such as Jack S. Honda and Yu-Wen Y. Chang. These collaborations have contributed to the advancement of technology in their respective fields.
Conclusion
Lloyd T. Yuan's contributions to semiconductor technology through his innovative patents demonstrate his expertise and commitment to advancing high-frequency applications. His work continues to influence the industry and inspire future innovations.
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