Millimeter Wave Absorbing Electromagnetic Properties of ZnO Whisker/Silicon Resin Coating Material

2016 ◽  
Vol 852 ◽  
pp. 1055-1059 ◽  
Author(s):  
Xiong Xuan ◽  
Hai Yan Zhang ◽  
Guo Xun Zeng ◽  
Ng Kung Bo ◽  
Chi Hou Chan
Keyword(s):  
Boundary Conditions ◽  
Millimeter Wave ◽  
Coating Thickness ◽  
Maxwell Equations ◽  
Electromagnetic Properties ◽  
Wave Band ◽  
Absorption Bands ◽  
Resin Coating ◽  
Absorbing Property ◽  
Silicon Resin

Wave-absorbing coating samples are fabricated with ZnO whisker, the absorbent and silicon resin coating as the binder.The influences of the content of ZnO whisker in the absorbing coating and the thickness of the coating on millimeter wave absorbing property are analyzed.With the increasing of the thickness, the absorbing performance of the sample is enhanced significantly , the results show that with a ZnO whisker mass of 50% and coating thickness of 2 mm, excellent absorption (R<-10dB) is observed in the wave band from 66 to 78 GHz (with a bandwidth of 12GHz) . When the ZnO whisker mass is reduced to 30% with the same thickness of 2mm, two absorption bands are obtained from 55 to 67 GHz (with a bandwidth 12GHz) and 100 to 110 GHz (with a bandwidth 10GHz). Maxwell equations and boundary conditions are used to analyze the absorbing mechanism of the coating.

scholarly journals Verification of the Radio Wave Absorption Effect in the Millimeter Wave Band of SWCNTs and Conventional Carbon-Based Materials

2021 ◽  
Vol 11 (23) ◽  
pp. 11490
Author(s):  
Seiki Chiba ◽  
Mikio Waki
Keyword(s):  
Carbon Black ◽  
Radio Wave ◽  
Millimeter Wave ◽  
Coating Thickness ◽  
Measurement Method ◽  
Wave Band ◽  
Absorption Effect ◽  
Wave Absorption ◽  
Radio Wave Absorption ◽  
Millimeter Wave Band

Using a sample coated with three types of carbon-based paints, namely single-wall carbon nanotube (SWCNTs), carbon black, and graphite, the amount of radio wave absorption for each was measured. SWCNTs proved to have the superior radio wave absorption effect in the millimeter band. Considering the change in the amount of radio wave absorption depending on the coating amount, three different coating thicknesses were prepared for each test material. The measurement frequency was set to two frequency bands of 28 GHz and 75 GHz, and the measurement method was carried out based on Japanese Industrial Standard (JIS) R1679 “Radio wave absorption characteristic measurement method in the millimeter wave band of the radio wave absorber.” As for the amount of radio wave absorption in the 28 GHz band, a maximum amount of radio wave absorption of about 6 dB was obtained when 35 m of CNT spray paint was applied. It was confirmed that the carbon black paint came to about 60% that of the SWCNT, and the graphite paint did not obtain much radio wave absorption even when the coating thickness was changed. Furthermore, even in the 75 GHz band, the radio wave absorption was about 7 dB when 16 μm of CNT spray paint was applied, showing the maximum value. Within these experimental results, the CNT spray paint has a higher amount of radio wave absorption in the millimeter wave band than paints using general carbon materials. Its effectiveness could be confirmed even with a very thin coating thickness of 35 μm or less. It was also confirmed that even with the same paint, the radio wave absorption effect changes depending on the difference in coating thickness and the condition of the coated surface.

LTCC Partially-Filled Post-Wall Rectangular-Waveguide Slot Array Antenna in the Millimeter-Wave Band

2012 ◽  
Vol E95.C (10) ◽  
pp. 1635-1642 ◽  
Author(s):  
Yuanfeng SHE ◽  
Jiro HIROKAWA ◽  
Makoto ANDO ◽  
Daisuke HANATANI ◽  
Masahiro FUJIMOTO
Keyword(s):  
Millimeter Wave ◽  
Rectangular Waveguide ◽  
Array Antenna ◽  
Wave Band ◽  
Waveguide Slot ◽  
Millimeter Wave Band

TWO FREQUENCY "UNAMBIGUOUS" HETERODYNE INTERFEROMETER BASED ON PHASE LOCKED MILLIMETER-WAVE BAND TRANSCEIVERS

2017 ◽  
Vol 76 (10) ◽  
pp. 903-918
Author(s):  
A. V. Varavin ◽  
G. P. Ermak ◽  
A. S. Vasilev ◽  
A. V. Fateev ◽  
N. V. Varavin ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Wave Band ◽  
Heterodyne Interferometer ◽  
Millimeter Wave Band

WAVEGUIDE-DIELECTRIC RESONATOR OF THE MILLIMETER WAVE BAND

2011 ◽  
Vol 70 (15) ◽  
pp. 1315-1322
Author(s):  
R. I. Belous ◽  
S. P. Martynyuk ◽  
A. P. Motornenko ◽  
I. G. Skuratovskiy
Keyword(s):  
Millimeter Wave ◽  
Dielectric Resonator ◽  
Wave Band ◽  
Millimeter Wave Band
Sign in / Sign up

Export Citation Format

Share Document