Related Experiment Video
Updated: Jan 28, 2026

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
Published on: February 13, 2018
Instantaneous measurement of high-power millimeter-wave beam for 28 GHz gyrotron
Maho Matsukura1, Kohei Shimamura1, Masatoshi Suzuki1
1Department of Energy and Mechanical Engineering, University of Tsukuba, Tsukuba, Japan.
Abstract:
An instantaneous measurement system of high-power millimeter-wave was proposed and demonstrated with a 28 GHz gyrotron at the Plasma Research Center, University of Tsukuba. The high-power detector consists of an attenuator and a linear polarized microstrip antenna with an F-class load rectifier, which is a commonly used system for radio-frequency wireless power transmission. The detector obtained the power distribution of the gyrotron output beam which showed good agreement with the infrared camera image. The rectenna array detector received 45 W RF input power with a 0.4 ms response time. The results revealed that the proposed narrow band detector is useful as an imaging sensor and power meter for high-power millimeter-wave beam output with a wide wavelength range.
Related Concept Videos
Instantaneous Power
Energy and Power of a Wave
Waves can also be concentrated or spread out, as characterized by the intensity of the wave. Intensity is directly...
Instantaneous Velocity - II
Instantaneous Acceleration
Instantaneous Velocity - I
Instantaneous Center of Zero Velocity
To analyze this, consider two points on the wheel: point A and point B. The absolute velocity of point B can be expressed as the vector sum of the absolute velocity of point A and the relative velocity of point B with respect to point A. To simplify this analysis,...

