Compact multiple EBG cells loaded UWB-narrowband antenna pair with high isolation for cognitive radio (CR) based MIMO applications

• Published in: International journal of electronics and communications Vol. 127; p. 153420
• Main Authors: Naidu, P. Ravi Teja, Saha, Chinmoy, Vamshi Krishna, K., Shaik, Latheef A., Siddiqui, Jawad Yaseen, Antar, Yahia
• Format: Journal Article
• Language: English
• Published: Elsevier GmbH 01.12.2020
• Subjects: Cognitive Radio (CR) UWB antenna; EBG cells; Isolation enhancement; MIMO antenna; Mutual coupling; Mutual coupling; Cognitive Radio (CR) UWB antenna; EBG cells; MIMO antenna; Isolation enhancement
• ISSN: 1434-8411; 1618-0399
• DOI: 10.1016/j.aeue.2020.153420

In this paper, a cognitive radio (CR) based multiple-input-multiple-output (MIMO) antenna element comprising of an ultra-wideband (UWB) and narrowband (NB) radiator is proposed. The antenna consists of a circular monopole to achieve UWB operation and a quarter-wavelength monopole for NB operation. The high isolation between the two radiators is obtained by accommodating multiple electromagnetic band-gap (EBG) cells and an isolating stub between the UWB and NB radiators. Multiple EBG cells of varying size are employed to obtain isolation-enhancement over the entire UWB spectrum. The proposed design exhibits high isolation, better than 25 dB over most of the UWB spectrum. Fabricated prototype was measured and compared with simulations and good agreement was obtained. The antenna also satisfied the MIMO performance metrics. The size of the antenna is 50 × 50 mm2. Proposed highly isolated MIMO antenna pair is a good candidate for multi-standard radio applications requiring wideband and narrowband antennas in the same platform.