"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 2, 2017

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Synthesis of Semi-Transparent Screen Forming a Cutoff Pattern

 

D. V. Tatarnikov 1,2, A. A. Generalov 1,2,3

1 Topcon Positioning Systems, Moscow Aviation Institute

2 Topcon Positioning Systems, Moscow Aviation Institute

3 Institute of Control Sciences of Russian Academy of Sciences (ICS RAS)

 

The paper is received on November 8, 2016, after correction - on February 7, 2017

 

Abstract. Semi-transparent screen forming a cut-off pattern is discussed. The results are relevant to jamming protection, electromagnetic compatibility and satellite positioning. In the geometrical optics (GO) limit, analytical approximations for impedance distribution along the screen have been developed; it has been shown that the impedance is pure resistive. To determine the domain of applicability, a numerical procedure has been implemented as a solution of the integral equation by the method of moments. The GO approximation becomes inapplicable as the distance between the source and the screen decreases. Beyond the GO approximation, an optimization procedure for synthesis of impedance distribution has been employed. At each step of the optimization procedure, the solution of the direct problem in the form of an integral equation was carried out for a certain profile of the impedance. Minimization of the quadratic functional describing the desirable cutoff of source radiation pattern has been employed. Resulting impedance occurs to be complex with a positive (resistive) real part. Numerical estimations are discussed including that of the frequency dependence of impedance distribution. It has been shown that the main constraint factor for achieving the desired cut-off pattern is the distance between the source and the screen. For the distances more than 10 wavelengths, a 40dB cutoff is achievable within an angular sector of +/-10 degrees around a desirable light-shadow boundary. With one wavelength distance, the cutoff is 20dB. The related figure is potentially valid for 0.5 wavelength distance.

Key words: Half-plane diffraction, semi-transparent sheet, cut-off pattern.

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For citation
:
D.V.Tatarnikov, A.A.Generalov. Synthesis of semi-transparent screen forming a cutoff pattern. Zhurnal Radioelektroniki - Journal of Radio Electronics, 2017, No. 2. Available at http://jre.cplire.ru/jre/feb17/7/text.pdf. (In Russian)