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On the physical limit of radar absorbers

Karlsson, Anders LU and Kazemzadeh, Alireza LU (2010) In Technical Report LUTEDX/(TEAT-7191)/1-10/(2010) TEAT-7191.
Abstract
A previous investigation has shown that at normal angle of incidence, the integral of the reflectance over wavelength is bounded for a flat metal backed absorber. The bound is applicable to any absorber made of linear, time-invariant, causal and passive materials. We generalize the physical bound to arbitrary angle of incidence and polarization. Different design examples and numerical calculations are provided to investigate the inequalities. It is shown that the theoretical limit for TE polarization results in fair approximations of the integral of the reflectance over wavelength but the TM polarization overestimates the integral value. A simple relation for estimating the optimal thickness of a nonmagnetic absorber is suggested for... (More)
A previous investigation has shown that at normal angle of incidence, the integral of the reflectance over wavelength is bounded for a flat metal backed absorber. The bound is applicable to any absorber made of linear, time-invariant, causal and passive materials. We generalize the physical bound to arbitrary angle of incidence and polarization. Different design examples and numerical calculations are provided to investigate the inequalities. It is shown that the theoretical limit for TE polarization results in fair approximations of the integral of the reflectance over wavelength but the TM polarization overestimates the integral value. A simple relation for estimating the optimal thickness of a nonmagnetic absorber is suggested for arbitrary angle of incidence. (Less)
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author
organization
publishing date
type
Book/Report
publication status
published
subject
in
Technical Report LUTEDX/(TEAT-7191)/1-10/(2010)
volume
TEAT-7191
pages
10 pages
publisher
[Publisher information missing]
external identifiers
  • Scopus:78650397675
language
English
LU publication?
yes
id
f8decf91-16d9-4c41-8401-265514c40c74 (old id 1581320)
date added to LUP
2010-04-06 09:46:08
date last changed
2016-10-13 04:55:13
@misc{f8decf91-16d9-4c41-8401-265514c40c74,
  abstract     = {A previous investigation has shown that at normal angle of incidence, the integral of the reflectance over wavelength is bounded for a flat metal backed absorber. The bound is applicable to any absorber made of linear, time-invariant, causal and passive materials. We generalize the physical bound to arbitrary angle of incidence and polarization. Different design examples and numerical calculations are provided to investigate the inequalities. It is shown that the theoretical limit for TE polarization results in fair approximations of the integral of the reflectance over wavelength but the TM polarization overestimates the integral value. A simple relation for estimating the optimal thickness of a nonmagnetic absorber is suggested for arbitrary angle of incidence.},
  author       = {Karlsson, Anders and Kazemzadeh, Alireza},
  language     = {eng},
  pages        = {10},
  publisher    = {ARRAY(0x8249480)},
  series       = {Technical Report LUTEDX/(TEAT-7191)/1-10/(2010)},
  title        = {On the physical limit of radar absorbers},
  volume       = {TEAT-7191},
  year         = {2010},
}