Abstract
In this research work, a multifunctional metamaterial inspired surface is designed for two different applications, namely, electromagnetic (EM) absorber and radiator with pattern agility. The designed surface consists of periodic arrays of metallic loops and circular patches printed on a thin grounded dielectric slab. Lumped resistors are fixed in the outer ring where the inner patch is connected to the feeding network through metallic vias. Firstly, the basic unit cell of the surface is utilized as a dual-band EM absorber. Secondly, the same surface is utilized as a beam switching radiator. Each unit cell has two switchable feeding points which are connected to a single-pole double-throw (SPDT) switch designed on the bottom layer. The surface is symmetrical therefore the excitation of each unit cell at two feeding ports can produce a phase shift of 180°. By properly selecting the feeding point of the four elements, the surface can generate sum-beams and difference-beams. The surface exhibit low radar cross section (RCS), high gain, and high efficiency. A prototype of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${4} \times {4}$ </tex-math></inline-formula> elements array is manufactured and experimentally verified in an anechoic chamber.
Highlights
I N modern wireless communication technology, reconfigurable antennas have wide attention because of their flexibility on the pattern, frequency, or polarization
The equivalent circuit model of the proposed unit cell is simulated in advanced design system (ADS), and its results are displayed in Fig. 2 (a)
In this research work, a surface is designed for two applications namely, for switchable radiation and absorption
Summary
I N modern wireless communication technology, reconfigurable antennas have wide attention because of their flexibility on the pattern, frequency, or polarization. In [11], [12], the authors have made an effort to design an antenna array with radiation pattern agility based on PIN diodes in the feeding network. In the previous research work, the metamaterial absorbers are combined to the regular patch antennas for RCS reduction. These combinations of the metamaterial absorber reduce the RCS but it may degrade the radiation performance, and it has no contribution in wireless communication rather than RCS reduction. To the best of author’s knowledge, surface with multiple functions such are switchable absorption and beam switchable radiation with low RCS, high gain and high efficiency have not been presented so far. The surface exhibit low RCS, high gain, and high radiation efficiency
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