"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 9, 2017

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Optimization of the lens collimator located in the tapered anechoic chamber


N. P. Balabukha 1, N. L. Menshikh 1,2, V. S. Solosin 1

¹ Institute of Theoretical and Applied Electrodynamics RAS, Izhorskaya 13, Moscow 125412, Russia

² Moscow Institute of Physics and Technology (State University), Institutskiy 9, Dolgoprudny, Moscow region 141700,  Russia


The paper is received on September 7, 2017


Abstract. 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 in diameter.

Keywords: tapered anechoic chamber, dielectric lens, matching layer, method of moments, FEKO.


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For citation:

N. P. Balabukha, N. L. Menshikh, V. S. Solosin. Optimization of the lens collimator located in the tapered anechoic chamber. Zhurnal Radioelektroniki - Journal of Radio Electronics, 2017, No. 9. Available at http://jre.cplire.ru/jre/sep17/5/text.pdf. (In Russian)