Efficient Antenna Pattern Sampling using Complex Source Beams for Millimeter Wave Short Range Scenarios

In this work, we describe and demonstrate the use of the Complex Source Beam method (CSB), which is especially suited for simulation of short range scenarios, where far field assumptions may not hold. This approach provides an efficient simulation method for the calculation of the electromagnetic wave propagation of large multiple input multiple output (MIMO) systems or large intelligent reconfigurable surfaces (IRS) where the far field distance can become very large. While it is not efficient to perform full wave simulations of complete transmission scenarios with respect to the required computing and processing capacity, the accuracy of far field based methods like ray tracing degrades significantly in near field scenarios as well. Thus, we investigate the CSB method to simulate electromagnetic wave propagation at millimeter wave frequencies in short range scenarios. A comparison with a full wave simulation at a reference frequency of 80 GHz is used to validate the accuracy of the described method.