Location History:
- Kawagoe, JP (1980 - 1987)
- Saitama, JP (1988)
Company Filing History:
Years Active: 1980-1988
Title: Tomohisa Yokogawa: Innovator in Mobile Antenna Technology
Introduction
Tomohisa Yokogawa is a prominent inventor based in Kawagoe, Japan. He has made significant contributions to the field of mobile antenna technology, holding a total of 11 patents. His work focuses on enhancing the performance and functionality of antennas used in various applications.
Latest Patents
Yokogawa's latest patents include a mobile antenna unit designed for use in the FM broadcast band. This innovative antenna unit is adapted to be mounted on the windshield of a vehicle, providing a gain and directivity pattern similar to that of an external whip antenna. The design features a conductor mounted near one of the pillars supporting the windshield, which appears electrically as an inductor, while the conductor acts as a capacitor. By properly dimensioning and spacing the conductor with respect to the pillar, resonance is achieved in the FM broadcast band.
Another notable patent is an antenna switching circuit for a diversity receiving system. This circuit selectively transmits RF signals from multiple antennas, including signals of different frequency bands such as VHF and MF, using a single output terminal. To prevent a level drop of RF signals from one frequency band due to the common use of the output terminal, a unidirectional switching element is incorporated into the switching circuit network. Additionally, a branching circuit is provided to separate RF signals of different frequency bands, utilizing a variable impedance characteristic of a semiconductor switching element.
Career Highlights
Yokogawa is currently employed at Pioneer Electronic Corporation, where he continues to innovate and develop advanced antenna technologies. His work has significantly impacted the field, leading to improved communication systems and enhanced user experiences.
Collaborations
Throughout his career, Yokogawa has collaborated with notable colleagues, including Reisuke Sato and Masanao Okatani. These collaborations have fostered a creative environment that has led to groundbreaking advancements in antenna technology.
Conclusion
Tomohisa Yokogawa's contributions to mobile antenna technology exemplify his dedication to innovation and excellence. His patents reflect a deep understanding of the complexities involved in antenna design and functionality. Through his work at Pioneer Electronic Corporation and collaborations with esteemed colleagues, Yokogawa continues to shape the future of communication technology.