Title :
A Thin X-Band Microwave Absorber Using a Center Shorted Spiral Medium
Author :
Liu, Yunhong ; De Flaviis, Franco ; Alex?³poulos, Nic?³laos G.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of California Irvine, Irvine, CA
fDate :
7/1/1905 12:00:00 AM
Abstract :
In this letter, the reflection characteristics of a shorted two-arm spiral medium are examined numerically. A magnetic-type phase response zone has been observed at a lower frequency range for both polarizations compared to other magnetic photonic band-gap (PBG) structures, such as the mushroom structure. The proposed structure exhibits good stability on the incident angle. The resonant frequency (angGamma = 0) varies within 1% with respect to the incident angle (thetas isin (0deg 60deg) for both polarizations. An absorption state occurs at the first magnetic-type phase response region. A 0.508-mm-thin X-band microwave absorber is fabricated and verified in a WR90 waveguide. An optimized design with 1.5% absorbing bandwidth is also given. Finally, the absorbing mechanism is discussed.
Keywords :
electromagnetic compatibility; electromagnetic wave absorption; electromagnetic wave polarisation; electromagnetic wave reflection; microwave materials; EM polarization; IEEE; WR90 waveguide; center shorted spiral medium; electromagnetic compatibility; magnetic-type phase response zone; reflection characteristics; size 0.508 mm; thin X-band microwave absorber; Absorbing media; electromagnetic compatibility (EMC); photonic band-gap (PBG) materials; reflection coefficient;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
Conference_Location :
12/9/2008 12:00:00 AM
DOI :
10.1109/LAWP.2008.2010531
