Limitations of the electromagnetic isolation for multi-antenna systems on small terminals with capacitive coupling elements

Recently, there has been a growing interest for evaluating the performance potential of multiple antenna systems on small terminals. This work focuses on Capacitive Coupling Elements (CCEs), which are expected to perform differently with respect to self-resonating elements. Several CCEs with different volumes and lengths are simulated, studying the bandwidth potential (BP) and isolation potential. The limitations of the Electromagnetic Isolation metric are presented, showing that more metrics might be needed for this peculiar antenna type.