This inventor holds 4 USPTO granted patents, plus 2 CIPO patents. Top assignees: Nippon Steel Corporation, System Uniques Corporation, Nemoto Project Industry Co., Ltd.. Active years: 1989-1992.
Location History:
- Kimitsu City, JP (1989)
- Tokyo, JP (1991)
- Otemachi, JP (1991 - 1992)
Company Filing History:
4 out of 3,711 
2 out of 5 
1 out of 3 
Years Active: 1989-1992
Title: Ryuichi Hiratsuka: Innovator in Antenna Technology
Introduction
Ryuichi Hiratsuka is a notable inventor based in Otemachi, Japan. He has made significant contributions to the field of antenna technology, holding a total of 4 patents. His innovative approaches have advanced the capabilities of satellite tracking and attitude control systems.
Latest Patents
Hiratsuka's latest patents include an antenna apparatus and an attitude control method. The attitude control method involves detecting the phase difference between signals received by at least two antennas. This allows for the detection of the angle of deflection between the direction of arrival of radio signals and the antenna beams. By utilizing antennas that are separately driven, the phase of the received signals can be shifted equivalently to when the antennas are driven as a consolidated unit. Additionally, when at least three antennas are arranged orthogonally, the antennas can be divided into two groups for individual driving. This design reduces the inertia of moving parts and minimizes the size and weight of the drive mechanisms. Furthermore, two orthogonal functions are employed to represent the phase of the deflection angle, enabling effective control and error elimination.
Another significant patent is the satellite tracking antenna system, which comprises three or four plane antennas arranged on a single plane. This system detects phase differences between signals received by antennas to determine the declination of the antenna unit with respect to the satellite in both azimuth and elevation directions. The antenna unit is then driven to minimize these declinations to zero, enhancing tracking accuracy.
Career Highlights
Throughout his career, Ryuichi Hiratsuka has worked with prominent companies such as Nippon Steel Corporation and System Uniques Corporation. His experience in these organizations has contributed to his expertise in antenna technology and innovation.
Collaborations
Hiratsuka has collaborated with notable individuals in his field, including Kazuro Kato and Masahiro Uematsu. These collaborations have further enriched his work and contributed to advancements in antenna systems.
Conclusion
Ryuichi Hiratsuka's contributions to antenna technology and his innovative patents have significantly impacted the field. His work continues to influence advancements in satellite tracking and attitude control systems, showcasing the importance of innovation in technology.