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2 Journal of Telecommunications and Information Technology

2 2023

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Radar Cross-section Reduction of Planar Absorbers Using Resistive FSS Unit Cells

Jasim Mustafa B., Sayidmarie Khalil H.

Journal of Telecommunications and Information Technology

2023

nr 4

61--67

This paper demonstrates the feasibility of reducingradar cross-section by employing resistive sheets or rings inthe conducting elements of an FSS unit cell. The idea behindthe approach in question is to create power-absorbing elementswhich may help reduce the power reflected from FSS surface.The investigated FSS unit cells have the form of double-closedrings and double-closed-split rings. A carbon paste, serving asthe resistive layer, was inserted in various regions within the unitcell. The CST Microwave Studio software was used to obtain thereflection coefficient. Specific dimensions and conductivity of thepaste were selected to ensure better performance. Simulationresults showed that the reflection coefficient may be reducedby8dB, to14dB, by using carbon paste with the conventionalcopper layer.

Characterization of a Split Circle Element for Microstrip Reflectarrays

Sayidmarie Khalil H., Yahya Likaa S.

Journal of Telecommunications and Information Technology

2023

nr 3

62--67

A split circular element is proposed as a unit cell for reflectarray antennas. The unit cell is derived from a circle divided into four equal sectors. The radius of two oppositely located sectors is then scaled by a certain factor to form the proposed shape. The CST Microwave Studio Suite software simulator was used to investigate the performance of the proposed unit cell, which was evaluated using Floquet port excitation. The designed element's reflection phase range was compared to that of a conventional circular patch. Four scenarios of varied substrate characteristics are investigated for the antenna to establish the best performance parameters. The simulations showed that a basic substrate with a thickness of 0.16 mm and a dielectric constant of 3.2, backed by a 3 mm foam with a dielectric constant of 1.05 and a scaling factor of 0.72 offers a wide phase range of 601.3°. The obtained phase slope is 76.37°/mm or 134°/GHz.