Summary
International Symposium on Antennas and Propagation
2010
Session Number:1SC03
Session:
Number:1SC03-1
The Physics and Mathematics of Multiantenna Systems and How to Improve Their Performances
Tapan K. Sarkar, Magdalena Salazar-Palma,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
The objective of this tutorial is to illustrate that the principle of superposition of power is not valid in electrical engineering, and hence not applicable to analysis of multi antenna systems. In electrical engineering, it is the voltage and the current that can be superposed and that is why another name of it is field theory, as the voltages and the currents are the results of the fields. Examples will be presented to illustrate how the Maxwellian physics can be introduced to improve the performance of multi antenna systems. This group also includes MIMO systems. Consider two plane waves of respective power densities 100 and 1 W/m2 that are allowed to interact with each other. Even though one of the waves is only 1% in power density of the other, if the two waves interfere constructively or destructively, the resulting variation in the power density received is not 101 or 99 W/m2 but rather or resulting in 121 or 81 W/m2 ? a 40% change and not 1%, since it is the field or voltages or currents that can be added in the electrical engineering context, and not the powers. Hence, the first objective of this presentation is to define the appropriate metric for comparison of performance between various multiantenna systems.