A detailed insight of 2 × 2 high isolation wideband dual notched band MIMO antenna with evolution initiated by theory of characteristics mode

• Published in: International journal of microwave and wireless technologies Vol. 15; no. 8; pp. 1392 - 1411
• Main Authors: Sharma, Manish, Addepalli, Tathababu, Manda, Rajasekhar, Vidyavathi, T., Kapula, Prabhakara Rao
• Format: Journal Article
• Language: English
• Published: Cambridge, UK Cambridge University Press 01.10.2023
• Subjects: Antenna Design, Modelling and Measurements; Antenna radiation patterns; Antennas; Bandwidths; Broadband; Communications systems; Design; Far fields; Local area networks; MIMO communication; Substrates; Wireless communications; 2 × 2 MIMO; NRE; Diversity performance; DUS; PG; WLAN; 10 modes; TCM
• ISSN: 1759-0787; 1759-0795
• DOI: 10.1017/S1759078723000028

This research investigates the MIMO antenna by using the Theory of Characteristics Mode (TCM) where 10 modes are subjected in designing. Also, 5 modes are the significant mode and 2 modes correspond to non-significant which defines the operating bandwidth and notched bands. The proposed 2 × 2 MIMO antenna configuration is designed for wideband applications with a size of 0.44 × 0.68 mm2. The two isolated 12-sided polygons radiating patches placed adjacent to each other share a common ground which is printed on an FR4 substrate. The measured impedance bandwidth covers bandwidth 3.11–11.98 GHz with two bands rejecting capability: Wireless Local Area Network (WLAN) and Downlink-Uplink Satellite (DUS) system. These two interfering bands are mitigated by etching a C-type slot on the radiating patch and an inverted U-type slot in the microstrip feed. The simulated and measured results are also compared in the far-field region (Normalized Radiation Efficiency (NRE), Peak Gain (PG), and 2-D/3-D radiation pattern). Proposed MIMO antenna also offers good diversity performance with ECC2×2 < 0.00001, DG2×2 > 9.999 dB, TARC2×2 < −15.0 dB, CCL2×2 < 0.001 b/s/Hz and MEG2×2 ≅ −3.0 dB.