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We proposed EM-wave absorber with periodic patch antennas. It has two feed points on a square patch. We simulated electromagnetic field of patch antennas having infinite periodic structures by using FDTD method and designed at 2.4GHz band. Then, we manufactured and measured the EM-wave absorber for 2.45GHz. As a result, both H- and V-polarized waves could be absorbed at 2.4GHz.
Lightning electromagnetic pulse (LEMP) is a severe threat to sensitive electronic devices installed in buildings. In order to protect these devices from LEMP effects, the evaluation of the electromagnetic fields inside the building is required. Numerous studies have been devoted to the analysis of these fields stemming from direct and indirect lightning strikes. In this paper, using a GPGPU-based,...
Pyramidal radiowave absorbers are widely used for anechoic chambers. Therefore, it is important to know the electromagnetic absorption and temperature distribution characteristics of the absorber. Traditionally, a pyramidal radiowave absorber has been designed by using an approximate design method. Therefore, it seems important to design a pyramidal radiowave absorber accurately by using a numerical...
The electromagnetic noise radiated from LED bulb and power line becomes one of cause of the EMI problems. The limits value of the magnetic radiation noise from the light illuminated products is established by the measurement of large loop antenna. However, the near magnetic field around the LED bulb was not detected. In this study, the near electric field from LED bulb and power line is measured by...
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