This example is a more complete device for 28 GHz beamforming for 5G networks and includes an 8x8 patch antenna array, 1 to 8 power dividers and a Rotman lens initial stage. The design of the Rotman lens is performed using Remcom’s Rotman Lens Designer® (RLD) software, which produces a CAD version of the device for use in XFdtd®. In XFdtd, a set of eight 1 to 8 Wilkinson stripline power divider networks is designed to act as the connection between the Rotman lens and the antenna array. The performance of each stage is simulated and evaluated.
Series-fed patch elements forming an array are simulated to demonstrate antenna performance and beamforming including S-parameters, gain, and effective isotropic radiated power (EIRP) at 28 GHz. Beam steering is performed in one plane by adjusting the phasing at the input ports to each of eight elements.
Remcom’s MPI+GPU technology and large memory support are used to simulate an inter-vehicle communication system operating in traffic on a highway. This example demonstrates how massive electromagnetic design problems become tractable while still using the high resolution offered by an FDTD simulation.