Yasunori Miyazawa

A new 1 MHz-9 GHz thin-film permeameter

In this paper, we propose a new permeameter utilizing travelling electromagnetic field mode and a shielded-loop type planar pickup coil. We report RF packing technique to ensure measurements up to 9GHz, improved S/N ratio by 30dB.

Analysis of unnecessary radio wave near the inverter equipment at the carrier frequency-range of mobile terminal

In the 5th generation mobile communication system (5G), the carrier frequency range of mobile communication equipment will be extended to the 6 GHz band and higher, and the number of connected equipment is expected to reach 1 million units/km2. It is assumed that inverter and mobile communication devices are used in close proximity. On the other hand, with the widespread use of inverter equipment driven by a fast switching SiC or GaN device, the unnecessary radio wave can be emitted more from the inverter in the GHz band. In order to evaluate the influence of such unnecessary radio waves, we developed and measured the unnecessary radio waves emitted from inverter devices with high sensitivity, and confirmed its influence on wireless communication performance, using a wireless power transmission (WPT) system for electric vehicles as a test bench.

Magnetic integrated passives for information and communication technology

Mobile communication traffic is continuously doubling in recent years.

RF thin-film permeability measurements in a travelling electromagnetic field

Summary form only given. Thin film permeability measurements in the RF range gives useful information for materials science and modem IT device developments including cellular phone (0.8-2GHz) and bluetooth devices (2.45GHz). We propose a new permeameter utilizing traveling electromagnetic field mode and a shielded-loop type planar pickup coil. We measured the permeability profile of CoZnO using this permeameter.