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

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 x 2 MIMO antenna configuration is designed for wideband applications with a size of 0.44 x 0.68 mm(2). 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 ECC2x2 < 0.00001, DG(2x2) > 9.999 dB, TARC(2x2) < -15.0 dB, CCL2x2 < 0.001 b/s/Hz and MEG(2x2) approximately equal to -3.0 dB.