Electromagnetic field analysis was performed for the quiet zone of a tapered
anechoic chamber with a lens. Some parameters of the lens like focus distance
and diameter were optimized. The numerical calculations were performed by the
method of integral equations in FEKO program. Using cluster of ITAE RAS allowed
carrying out simulation of the field distribution in the quite zone of the
tapered chamber in frequency range of 0.4 – 1 GHz.
Matching layers are used for
improving lens properties. The matching pursues two goals: firstly, it reduces
reflections inside the lens and, secondly, it provides a smother “lens – air”
transition, thus reducing diffraction effects at the edges. Both
the lens and the matching layer are made of a new lightweight composite
material with unchangeable low dielectric permittivity. The diameter of the
lens is 4.5 meters.
The matching layer was developed,
which makes it possible to reduce the non-uniformity distribution of the field
in the quiet zone of the chamber by 0.5-1 dB within the frequency range of
0.4-1.0 GHz compared with the chamber with the lens without a matching layer.
It is shown that the field amplitude non-uniformity may become less than 2.2 dB
with the lens coated by a matching layer within the frequency range of 0.4 – 1
GHz and with the phase distribution non-uniformity not exceeding 15 degrees.
It is sufficient to make the
matching layer only on a plane surface of the lens. This matching layer ensures
the non-uniformity field distribution is the same as a large lens of 4.5 meters
tapered anechoic chamber, dielectric lens, matching layer, method of moments,
W.H. Emerson, H.B.
An improved design for indoor ranges. J.
Proceedings of the IEEE, 1965.
Vol. 53, No. 8, pp. 1079-1081.
L. H. Hemming, Electromagnetic Anechoic
Chambers. New-York, NY, USA: IEEE Press and Wiley Interscience, 2002.
N.P., Zubov A.S., Solosin V.S.
Kompaktnye poligony dlya izmereniya
kharakteristik rasseyaniya. [Compact range for measurements of object
scattering characteristics]. Moscow. Nauka Publ. 2007. 266 p. (In Russian)
Linzovye antenny [Lens antennas]. Moscow. Sovetskoe radio Publ. 1974. 280
p. (In Russan)
P. Piksa, S. Zvanovec, P. Cerny.
Elliptic and Hyperbolic Dielectric Lens Antennas in mm-Waves. Radioengineering, 2011. Vol. 20, No. 1, January. pp. 270-275.
S. Matitsine, P. Lagoiski, L. Matytsine,
M. Matytsine, T.-T. Chia, P.-K. Tan, V. Rodriguez. Extension of Tapered Chamber
Quit Zone with Large RF Lens. AMTA, October 2012, pp. 153-156.
T. Morita, S.B. Cohn. Microwave lens matching by simulated quarter-wave
IRE Transactions on Antennas and Propagation,
1956. Vol. 4, No. 1, pp. 33-39.
P.L. Bachman. Dielectric lens model. E-systems
Inc. Report for air Development center. National Technical Information Service, 1972.
Costa J.R., Silveirinha M.G., Fernandes
C.A. Evaluation of a Double-Shell Integrated Scanning Lens Antenna. IEEE
Antenna and Wireless Propagation letters, 2008. Vol.7, p.781.
N.L.Menshikh, V.S.Solosin. Mathematical simulation of electromagnetic
tapered anechoic chamber.
Antenny - Antennas. 2015. Vol. 220,
No. 9, pp. 61-66. (In Russian)
N.P.Balabukha, N.L.Menshikh, V.S.Solosin. Simulation of field distribution in
the of tapered anechoic chamber.
Antenny - Antennas. 2017. Vol. 236, No. 2,
A.V.Nikitenko, A.S.Zubov, N.E.Shapkina. Rigorous coupled-wave analysis in
calculating the electromagnetic scattering from a radio-absorbing material,
Mathematical Models and Computer Simulations, 2014, Vol. 26, No.9, pp.18–32.