Location History:
- Nagaoka-shi, Niigata-ken, JP (1992)
- Kawasaki, JP (1993 - 2002)
- Suzaka, JP (2002)
Company Filing History:
3 out of 39,238 
3 out of 832,843 Years Active: 1992-2002
Title: **Nobuo Hirasawa: Innovator in Duplexer Device Technology**
Introduction
Nobuo Hirasawa is a distinguished inventor based in Kawasaki, Japan. With a remarkable portfolio of six patents, he has made significant contributions to the field of acoustic wave technology, particularly in the development of duplexer devices. His innovations have paved the way for advanced communication technologies, demonstrating both practicality and efficiency.
Latest Patents
Hirasawa's most recent patents reflect his expertise in duplexer devices. One notable invention is a duplexer device that incorporates two surface acoustic wave filters with varying band center frequencies and a sophisticated phase matching circuit. This circuit aligns the phases of the filters and includes multiple line patterns, with at least one pattern strategically divided across several internal layers of a multi-layer package. The design enables a compact duplexer device that maintains stable filter characteristics.
In another significant contribution, Hirasawa developed a surface acoustic wave filter duplexer device featuring an optimal arrangement of a phase matching line pattern and wire bonding pads. This innovation ensures that the wire bonding pad layer contains multiple pads for connecting both the line pattern and external antenna, with careful positioning to enhance performance. The arrangements of pads ensure that a seamless connection is established, ultimately improving the functionality of the device.
Career Highlights
Nobuo Hirasawa has had an illustrious career, with experience at prestigious organizations such as Fujitsu Corporation. His expertise in developing innovative electronic components has made him a valuable asset in the technology sector.
Collaborations
Hirasawa’s work has been enriched by collaborations with notable engineers and inventors, including Osamu Ikata and Yoshio Satoh. Working alongside such talented individuals, he has contributed to advancements in electronic circuit design and surface acoustic wave technologies.
Conclusion
In conclusion, Nobuo Hirasawa's contributions to duplexer device innovations underscore his status as a leading inventor in acoustic wave technology. His inventive spirit and dedication to advancing communication technologies leave a lasting impact on the industry. Through his patents, he continues to inspire future innovations in the field.