Company Filing History:
2 out of 5,989 
1 out of 8 
1 out of 1,258 Years Active: 1978-1996
Title: **William J. Keane: Innovator in High-Frequency Technologies**
Introduction
William J. Keane, based in San Jose, CA, is a notable inventor with a remarkable portfolio of seven patents. His work largely focuses on high-frequency technologies, contributing significantly to the fields of frequency synthesis and ferrimagnetic filtering.
Latest Patents
Among his latest inventions is the **Fast Tuning YIG Frequency Synthesizer**, which leverages a fixed oscillator driving a comb line generator to produce a spectrum of comb lines. Specifically, one of these is selected by a switched array of fixed-tuned, YIG passband filters. The ingenuity of this design lies in its ability to combine the selected comb line with a signal from a local oscillator, primarily utilizing a direct digital synthesizer. The output undergoes further filtering through another switched array to isolate the desired sideband while filtering out the unwanted comb line and alternate sidebands. Some variations of this design incorporate tunable YIG filters and a reverse slope equalizer that optimize RF amplification without encountering saturation.
In addition, Keane has developed **YIG Tuned High Performance Filters Using Full Loop, Nonreciprocal** technology. This invention features nonreciprocally coupled ferrimagnetic band reject and bandpass filters, designed to operate across passbands ranging from 2-18 GHz and 6-18 GHz, respectively. Central to this innovation is the arrangement of ferrimagnetic spheres within nonmagnetic, electrically conductive cavities, enhancing filter performance by controlling signal transmission with precision. Furthermore, the design effectively minimizes spurious responses, ensuring high fidelity in RF communications.
Career Highlights
Throughout his career, William J. Keane has collaborated with reputable companies, including Eaton Corporation, contributing his expertise in high-frequency technology. His work has had a lasting impact on advancements in electronic communications and signal processing.
Collaborations
During his tenure, Keane has worked alongside notable professionals, including Christopher F. Schiebold and Dirk M. Hoekstra. These collaborations have fostered innovation and have played a crucial role in the development of his groundbreaking technologies.
Conclusion
William J. Keane’s inventive spirit and commitment to technological advancement are evident in his extensive patent portfolio. His pioneering work, particularly in frequency synthesis and ferrimagnetic filtering, continues to inspire future innovations in electronics. As technology evolves, the contributions of inventors like Keane will undoubtedly pave the way for new frontiers in high-frequency applications.