John B Francis

Title: Innovations of John B Francis

Introduction

John B Francis is a notable inventor based in Littleton, MA (US). He has made significant contributions to the field of electrical engineering, particularly in the design of baluns and coaxial transmission line structures. With a total of 10 patents to his name, his work has had a considerable impact on modern technology.

Latest Patents

One of his latest patents is a balun comprising stepped transitions between balanced and unbalanced connections. This innovative design includes ground rings of differing lengths connected by caged vias. An example balun features a center conductor that passes through a printed wiring board with multiple dielectric layers and cage vias arranged relative to the center conductor. The cage vias consist of a first set that extends between an unbalanced connection and a balanced connection, connected to electrical ground through a first ground ring. Additionally, there is a second set of cage vias that extend from the unbalanced connection part-way through the printed wiring board, connected to the electrical ground through a second ground ring, with the second circular arc being longer than the first.

Another significant patent is for a coaxial transmission line structure. This structure includes a center conductor section with an input contact and a larger output contact. The center conductor features various geometrically shaped, electrically conductive layers that progressively increase in size from the input to the output contact. These layers are interconnected by staggered microvias passing through dielectric layers. The outer conductor section is disposed about and coaxial with the center conductor, electrically isolated by the dielectric layers.

Career Highlights

John B Francis is currently employed at Raytheon Company, where he continues to innovate and develop advanced technologies. His work has been instrumental in enhancing the performance and efficiency of electronic systems.

Collaborations

Throughout his career, John has collaborated with several talented individuals, including Angelo M Puzella and Patricia S Dupuis. These collaborations have contributed to the successful development of his patented technologies.

Conclusion

John B Francis is a distinguished inventor whose work in baluns and coaxial transmission line structures has advanced the field of electrical engineering. His contributions continue to influence modern technology and inspire future innovations.