Location History:
- Lansdale, PA (US) (2000)
- Landsale, PA (US) (2005)
Company Filing History:
Years Active: 2000-2005
Title: The Innovations of Donald R. Shepherd
Introduction
Donald R. Shepherd is a notable inventor based in Landsale, PA (US). He has made significant contributions to the field of electromagnetic testing and measurement. With a total of 2 patents, his work has advanced the understanding and application of electromagnetic susceptibility testing.
Latest Patents
One of Shepherd's latest patents is an electromagnetic susceptibility testing apparatus. This invention addresses the frequency-dependent phase center movement in near-field, unshielded electromagnetic susceptibility testing. By bending the rearmost dipole elements forward, the effectiveness of the testing can be significantly improved. Each bent dipole element features an inner portion and an outer portion connected at a bend, allowing for enhanced performance. Additionally, the frequency range of the antenna can be extended by forming each element of the longest dipole with an undulating shape when viewed along the boom.
Another significant patent is a broadband directional coupler that includes amplifying and sampling capabilities. This directional coupler is designed for radio frequency power measurement and utilizes a capacitive voltage divider connected to the center conductor of a transmission line. The output of the divider connects to a field effect transistor amplifier, making the divider frequency-independent over a wide range. The outer conductor of the transmission line consists of two sections separated by a gap, allowing for a current sample to be tapped. This innovative design combines the output of the amplifier and the current sample to provide a signal representing forward or reflected power in the transmission line.
Career Highlights
Donald R. Shepherd is currently employed at Amplifier Research Corporation, where he continues to innovate in the field of electromagnetic technology. His work has been instrumental in developing advanced testing and measurement solutions.
Collaborations
Throughout his career, Shepherd has collaborated with notable colleagues, including Frederick Schirk and Frank A. Bohar. These partnerships have contributed to the success of his inventions and the advancement of technology in their field.
Conclusion
Donald R. Shepherd's contributions to electromagnetic testing and measurement are significant and impactful. His innovative patents reflect his expertise and dedication to advancing technology. His work continues to influence the industry and inspire future innovations.