LOW CORRELATION MIMO ANTENNAS WITH NEGATIVE GROUP DELAY

Jae-Young Chung, Taesik Yang, Juhyung Lee
2011 Progress In Electromagnetics Research C  
A key feature of upcoming 4G wireless communication systems is multiple-input-multiple-output (MIMO) technology. To make the best use of MIMO, the antenna correlation between adjacent antennas should be low (< 0.5). In this context, we propose a correlation reduction technique suitable for closely spaced antennas (distance, d < λ/40). This technique reduces mutual coupling between antennas and concurrently uncorrelates antennas' radiation characteristics by inducing the negative group delay at
more » ... ive group delay at the target frequency. The validity of the technique is demonstrated with a USB dongle MIMO antenna designed for LTE 700 MHz band. Measurement results show that the antenna correlation is reduced more than 40% using the proposed technique.
doi:10.2528/pierc11051007 fatcat:ay4jhrfccvaqlkezlxosici2fa