Integration of coupling resonator as port-isolator and MMLC-Minkowiski fractal loop for Wi-Max rejection in 4-port compact UWB MIMO antenna

Asutosh Mohanty and Sudhakar Sahu

Journal of Electromagnetic Waves and Applications, 2021, vol. 35, issue 10, 1359-1377

Abstract: This paper presents a 4-port compact UWB MIMO antenna. It has 45 $ ^{0} $ 0 tilted offset feed for better impedance matching and connected to cornered cut-out quad-radiators. Radially symmetric resonators are provided for impedance matching and isolation improvements. A miniaturized magnetic LC (MMLC) Minkowiski fractal loop acts as a magnetic shield between electric walls of feed and resonator for Wi-max band rejection. The contra-rotational symmetry of resonator and rotationally asymmetric strips in ground enhances isolation. To validate, a prototype antenna is fabricated and measured which shows good agreements. The proposed antenna has a compact dimension 31 mm × 31 mm, operates from 2.27 to 11.7 GHz and reject bands at 3.0–4.2 GHz. The average gain is > 4 dBi with ECC

Date: 2021
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DOI: 10.1080/09205071.2021.1890232

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