Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Thermally Reconfigurable Quad-Port MIMO Antenna With Independent Frequency Tuning(Elsevier GmbH, 2025) Karatay, Anil; Atac, EnesIn this paper, the design, simulations, and measurements of a thermally reconfigurable, compact, high-isolation, microstrip multiple-input multiple-output (MIMO) antenna are presented. We propose a quad-port microstrip antenna sharing the same metallic circular patch. The fully microstrip-based structure provides cost and fabrication advantages over the contemporary counterparts in the literature, and the ability to independently tune the frequencies of the ports allows the assignment of desired frequency bands to each port. The proposed antenna achieves frequency reconfigurability by solely adjusting the angles of the thermally-controlled shape-memory alloy-assisted structures offering more practical and cost-effective tuning compared to the conventional methods. It is well-suited for modern communication applications, as each port covers a unique spatial angle and has sufficient cross-polarization suppression.Article Citation - WoS: 1Citation - Scopus: 1Spiral-Shaped Dual-Port Microstrip Antenna for 5G/6G Applications With Wideband-To Transition Using Shape-Memory Alloy(Iop Publishing Ltd, 2025) Atac, Enes; Karatay, AnilWe propose a compact, thermally reconfigurable dual-port microstrip antenna featuring a spiral-shaped design and shape-memory alloy (SMA) that enable switching between wideband and narrowband operation for 5G/6G communication systems. The SMA's thermally induced shape-memory behavior allows reconfiguration in response to temperature changes without the need for electronic or optical control circuits, thus avoiding issues such as self-interference problem, high costs, regular maintenance requirements, and durability concerns. In the wideband mode, measured results show that Port 1 covers 4.7-10.5 GHz and Port 2 covers 4.5-8.3 GHz, which closely agrees with simulations. When the SMA is activated by heat, the antenna switches to the narrowband mode, where Port 1 operates at 7.6 and 9.5 GHz, and Port 2 operates at 8.9 GHz. A ground-plane isolation element ensures low coupling between the ports, with the envelope correlation coefficient remaining below 0.1 across all configurations. The antenna reaches a peak gain of 5.2 dBi and maintains consistent performance through repeated switching. By combining spiral-shaped geometry with a responsive smart material, this work presents a novel and efficient approach for designing reconfigurable dual-port antennas suitable for future wireless technologies.