Chapter 20Vector Spherical Harmonic Modeling of3D-antenna Radiation Functionfor an UWB-RT Simulator1
20.1. Introduction
The development of communications and ultra-wideband (UWB) localization systems has given rise to applications requiring more realistic reconstructions of signals transmitted between two terminals. In this situation of realistic signals, taking into account antenna effects (considering frequency and polarization aspects) is essential in order to provide not only realistic waveform characteristics, but also realistic signal received power. However, this necessity of considering antenna radiation pattern accurate information leads to large data volumes which are difficult to handle. Furthermore, this problem raises a significant question: what is the best approach in order to make both a description and quickly reconstruct the antenna radiation function in arbitrary directions?
This question served as the starting point of this study, whose purpose was to find an efficient manner of introducing antenna behavior into ray tracing (RT) channel modeling tools. Vector spherical harmonic (VSH) expansions of antenna radiation function are proposed here as a solution for both issues: compression of the amount of data needed for describing antenna characteristics and fast and correct retrieval of antenna array responses for waves coming from arbitrary directions. The presented approach stands at an intermediate level between the exact electromagnetic simulation and ...
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