Recently, a growing interest in wireless powering and charging of
mobile devices such as smartphones or laptops has emerged.
Typically, the energy is transferred from a sending antenna to a
receiving antenna via magnetic fields, which is known from the
transformer principle. For achieving high efficiencies while
allowing for possible variations in spatial positioning,
appropriate antenna systems for such inductive power transfer
applications must be designed and optimized carefully. In this
work, the physical relevant properties of the antennas are
extracted by means of specialized numerical techniques. First, some
fundamental concepts of electromagnetic phenomena are reviewed
while focusing on quasi-static conditions for Maxwell's equations.
After presenting the basic functionality of inductive power
transfer systems, the Partial Element Equivalent Circuit (PEEC)
method is derived as an efficient tool for inductive antenna system
design. The presented modeling approach is confirmed via
measurements and reference simulations for a system of printed
spiral coils, in which both fast simulation time and high accuracy
are the main achievements.
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