Yoshikatu Ishida

Title: The Innovations of Yoshikatu Ishida

Introduction

Yoshikatu Ishida is a notable inventor based in Ibaragi, Japan. He has made significant contributions to the field of communication technology, particularly in the development of advanced radio communication transceivers and surface acoustic wave (SAW) filters. With a total of 2 patents to his name, Ishida's work has had a lasting impact on the industry.

Latest Patents

One of his latest patents is a Duplex Radio Communication Transceiver. This invention aims to reduce the size of duplex radio communication devices, such as mobile telephones. The transceiver is constructed with a transmitting and receiving duplexer, a filter coupled to the duplexer, and an amplifier for signal amplification. All filters are made of acoustic surface wave filters, and the circuits are mounted on a single metallic substrate, sealed in a metallic casing. This innovative design results in a volume that is one-tenth the size of similar devices according to prior art.

Another significant patent is the Surface Acoustic Wave Resonator. This invention focuses on creating an SAW filter that can withstand high power. It connects multiple single open-ended surface acoustic wave resonators in series, with an earth conductor placed on part of the rear face of the piezoelectric substrate. The static capacities formed between the earth conductor and electrode conductors are utilized in the filter circuit. This structure allows a portion of input power to be transmitted directly to the output side, reducing mechanical stress on the materials and enabling the SAW filter to handle large power signals.

Career Highlights

Throughout his career, Yoshikatu Ishida has worked with prominent companies, including Hitachi, Ltd. and Hitachi Denshi Kabushiki Kaisha. His experience in these organizations has contributed to his expertise in communication technologies and innovations.

Collaborations

Ishida has collaborated with notable coworkers such as Mitsutaka Hikita and Atsushi Sumioka. Their combined efforts have further advanced the field of communication technology.

Conclusion

Yoshikatu Ishida's contributions to the field of communication technology through his innovative patents demonstrate his significant role as an inventor. His work continues to influence the development of smaller and more efficient communication devices.