Company Filing History:
Years Active: 2002-2004
Title: Katsuya Fujii: Innovator in Surface Acoustic Wave Technology
Introduction
Katsuya Fujii is a prominent inventor based in Osaka, Japan. He has made significant contributions to the field of surface acoustic wave (SAW) technology, holding a total of 2 patents. His work focuses on enhancing the performance of antenna duplexers and filters, which are crucial components in modern communication systems.
Latest Patents
Fujii's latest patents include a "SAW antenna duplexer having a phase shifter with less than 50 ohm characteristic impedance." This invention aims to optimally decrease the insertion loss and the voltage standing wave ratio (VSWR) at the center frequency and its vicinity in the pass band of the transmitter-band device. The design features an output port of the transmitter SAW filter that is electrically connected to a phase shift circuit, which is also connected to the receiver SAW filter. The transmitter and receiver SAW filters have different pass bands, allowing them to attenuate each other's pass band effectively. The phase shift circuit shifts the phase of the receiver SAW filter in the transmitter-band, ensuring high performance.
Another notable patent is the "Band switching filter using a surface acoustic wave resonator and an antenna duplexer using the same." This invention includes a resonator circuit with a surface acoustic wave resonator, a switching element, and an impedance element. The filter selectively passes or attenuates a signal through one of two pass bands using a single filter. The resonant frequency can be shifted to another frequency by selectively connecting the surface acoustic wave resonator to an impedance element via the switching element.
Career Highlights
Katsuya Fujii is currently employed at Matsushita Electric Industrial Co., Ltd., where he continues to innovate in the field of SAW technology. His work has significantly impacted the development of communication devices, enhancing their efficiency and performance.
Collaborations
Fujii has collaborated with notable colleagues, including Toru Sakuragawa and Yuki Sato. Their combined expertise has contributed to the advancement of technologies in their field.
Conclusion
Katsuya Fujii is a distinguished inventor whose work in surface acoustic wave technology has led to significant advancements in communication systems. His innovative patents reflect his commitment to improving device performance and efficiency.