Project M02 - Multidimensional Multiscale Simulations for Sub-mm-Wave Radio Systems
Achieved Results in the 1st Phase
Asymptotic Scattering Simulations of Multilayer Material
We have investigated the suitability of simulation results of ray tracing and physical optics EM simulations in case of complex material configurations.
The results shown on the right show that ray tracing, physical optics and a full wave simulation methods agree quite well with each other and the measurement.
A material characterization algorithm from M04 is applied to decompose the echo into the components of the different layers. The results of this characterization agree well.
Lens Design with Physical Optics
The design of focusing lens antennas is an important part of the overall design of THz imaging systems. Unfortunately, the electromagnetic simulation of such lenses to optimize the focal point of the field takes a large amount of time. This makes it unfeasible to iterate quickly to achieve an optimal design.
In the first phase of M02 we investigated the suitability of the well-known physical optics approach to simulate forward scattering for dielectric lens antennas.
We have shown, that the simulation of the focal area works very well when compared to a full-wave finite integration technique, which can be considered as an exact reference.
The main advantage of the PO approach is the greatly reduced simulation time while still providing results of good quality.
Initial Investigation Regarding Complex Source Beams
For the interaction of different simulation methods, we have identified so called complex source beams as suitable base functions in a series expansion of the electromagnetic field. This is due to the high directivity of such a complex source beam, which is an advantageous property, because only the interaction of very few of these basis functions have to be considered.
On the right, the Green’s function of a point source located in a complex-valued three-dimensional space is shown. The directivity is clearly visible.
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