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Holographic multiple-input multiple-output (H-MIMO) is considered as one ofthe most promising technologies to enable future wireless communications insupporting the expected extreme requirements, such as high energy and spectralefficiency. Empowered by the powerful capability in electromagnetic (EM) wavemanipulations, H-MIMO has the potential to reach the fundamental limit of thewireless environment, and opens up the possibility of signal processing in theEM-domain, which needs to be depicted carefully from an EM perspective,especially the wireless channel. To this aim, we study the line-of-sight (LOS)H-MIMO communications with arbitrary surface placements and establish an exactexpression of the wireless channel in the EM-domain. To further obtain a moreexplicit and computationally-efficient channel models, we solve the implicitintegrals of the exact channel model with moderate and reasonable assumptions.Numerical studies are executed and the results show good agreements of ourestablished approximated channel models to the exact channel model.

A Generalized Electromagnetic-Domain Channel Modeling for LOS Holographic MIMO with Arbitrary Surface Placements