Reducing Mutual Coupling of MIMO Antennas With Parasitic Elements for Mobile Terminals

By Zhengyi Li, Zhengwei Du, Masaharu Takahashi, K. Saito, Koichi Ito. IEEE Transactions on Antennas and Propagation, 2012

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Compact Offset Microstrip-Fed MIMO Antenna for Band-Notched UWB Applications (2015, background): “The strip acts as a parasitic resonator, which provides an additional coupling path to counteract the current coupled directly from one antenna element on the other [5], [6].”
Tapered Fed Compact UWB MIMO-Diversity Antenna With Dual Band-Notched Characteristics (2018, neutral): “systems such as for universal mobile telecommunications system [4] and wireless local area network (WLAN) [5].”
Tightly Arranged Four-Element MIMO Antennas for 5G Mobile Terminals (2019, methodology): “methods available, such as using neutralization lines [8]–[12], adding parasitic strips [13]–[15], etching slots [16], [17], and”
An Ultrawideband MIMO Antenna With Dual Band-Notched Function (2014, methodology): “Works include using slots on the ground [9], [10], decoupling network between ports [11], metamaterial or electromagnetic band-gap (EBG) structure [12], [13], and parasitic elements between antennas to enhance isolation [14], [15].”
Compact MIMO Antenna for Portable UWB Applications With Band-Notched Characteristic (2015, neutral): “Various MIMO antennas have been studied for uses in portable devices in different wireless systems such as the LTE [2], UMTS [3], and WLAN [4].”