Miniaturisation of the triangular patch antenna by the novel dual-reverse-arrow fractal


A completely unique geometry referred to as the twin-reverse-arrow fractal (DRAF) is introduced, which is the mix of two dual Koch fractals. It is implemented on an equilateral-triangular patch antenna. This structure has smaller dimensions compared to the rectangular structure and has wide applications in arrays to scale back their size. Furthermore, the utilization of triangular components in array results in the decrease of aspect-lobe levels. Four cases of the triangular patch are compared to show that the presented fractal geometry is effective within the miniaturisation of patch antenna and decreasing its resonance frequency, whereas the antenna bandwidth and potency are kept constant. To extend the antenna efficiency, an air space is placed below the patch. Finally, some of the corner of fractal triangle is cut to generate circular polarisation by correct positioning of the feed points. The proposed DRAF antenna achieved 40% reduction in size compared to the similar triangular antenna. The proposed DRAF geometry has potential applications in numerous radiating systems and microwave devices.

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