Hirohiko Yamamoto

Title: Hirohiko Yamamoto: Antenna and Microwave Identification Inventions.

Introduction

Hirohiko Yamamoto is an inventor associated with Sharp Kabushiki Kaisha Corporation. Based in Tenri, Japan, he is credited with 4 patents. His patent work includes antenna design and microwave data transmission.

Latest Patents

One of Yamamoto’s inventions, the “Back fire helical antenna,” uses two integrally formed radiation members. Their conductors, arms, and lower connection pieces create two loops with different electrical characteristics: the first exhibits capacitive impedance at the operating wavelength, while the second exhibits inductive impedance. Adjusting stubs on the radiation members helps control the phase of current flowing through the second loop.

Another invention, a “Microwave data transmission apparatus,” transmits and receives information using microwaves. It is designed to make identification tags smaller and lighter, improving convenience during installation. Potential applications include factory production control and detecting whether a person wearing a tag has entered or left a room.

Career Highlights

Yamamoto’s listed patents address practical communication technologies, from antenna impedance and current-phase control to compact identification systems. His work is associated with Sharp Kabushiki Kaisha Corporation.

Collaborations

Among Yamamoto’s listed coworkers are Tomozo Ohta and Kazutada Higashi.

Conclusion

Hirohiko Yamamoto’s patent portfolio reflects contributions to antenna engineering and microwave-based identification, with an emphasis on controlling radio-frequency behavior and enabling more convenient applications.