Application of Cross-correlation Greens Function along with FDTD for Fast Computation of Envelope Correlation Coefficient over Wideband for MIMO Antennas

摘要

In this paper, the concept of cross-correlation Green's functions (CGF) isused in conjunction with the finite difference time domain (FDTD) technique forcalculation of envelope correlation coefficient (ECC) of any arbitrary MIMOantenna system over wide frequency band. Both frequency-domain (FD) andtime-domain (TD) post-processing techniques are proposed for possibleapplication with this FDTD-CGF scheme. The FDTD-CGF time-domain (FDTD-CGF-TD)scheme utilizes time-domain signal processing methods and exhibits significantreduction in ECC computation time as compared to the FDTD-CGF frequency domain(FDTD-CGF-FD) scheme, for high frequency-resolution requirements. The proposedFDTD-CGF based schemes can be applied for accurate and fast prediction ofwideband ECC response, instead of the conventional scattering parameter basedtechniques which have several limitations. Numerical examples of the proposedFDTD-CGF techniques are provided for two-element MIMO systems involvingthin-wire half-wavelength dipoles in parallel side-by-side as well asorthogonal arrangements. The results obtained from the FDTD-CGF techniques arecompared with results from commercial electromagnetic solver Ansys HFSS, toverify the validity of proposed approach.