Tohoku University Technology: Radio wave reflector and backscatter communication method: T21-028
Reflection of radio wave in the direction of incident radio wave
In backscatter communication such as radar or radio frequency identifier (RFID) system, the received power decreases with the communication distance. To extend the communication range, it is necessary to increase the radar cross section of the target in the case of radar, and to increase the tag antenna gain in the case of RFID system. However, in both cases, it is not easy to reflect radio wave toward the arrival direction because the target to reflect radar signal and the arrival direction of the signal to reflect are not known. This invention is able to reflect radio wave in the direction in which the incident radio wave arrives by using a small radio wave reflector. This invention has an antenna element, a reflective circuit and a butler matrix circuit. When the reflection circuit receives an incident radio wave input from the antenna element via the butler matrix circuit, it sends out a reflected radio wave in the direction in which the incident radio wave arrived via the butler matrix circuit and antenna element. This small radio wave reflector allows radio wave to reflect in the direction in which the incident radio wave arrived.
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The revenue generated from technology transfer is reinvested as new research funding for universities and researchers, and is utilized to create further research outcomes. To ensure the smooth operation of this cycle, known as the "Intellectual Creation Cycle," we will vigorously promote technology transfer. The types of seeds we handle include patents, know-how, databases, and programs. We have established a collaborative framework by signing basic technology transfer agreements with the following universities (as of June 1, 2025): Tohoku University, Hirosaki University, Iwate University, Akita University, Fukushima University, Yamagata University, Tohoku Gakuin University, Iwate Medical University, Fukushima Medical University, Aizu University, Miyagi University, Hokkaido University, Muroran Institute of Technology, and Showa Medical University.
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