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In this paper we present an investigation into the radiation Q-factor of modal currents on a dipole antenna. First, we study the validity of the used thin-wire approximation with a reduced kernel. Different approaches of Q calculation are discussed and finally, the Q of coupled dipole antennas is evaluated. Good agreement between the assumed sinusoidal current distribution and the real cylindrical...
Radiation efficiency of two closely spaced metal sheets is studied by using the theory of characteristic modes (TCM). All modes of the structure in given frequency range are identified and their radiation efficiency is calculated. The overall radiation efficiency is computed as a combination of modal efficiencies. Radiation efficiency of the structure is studied for different distances between the...
The theory of characteristic modes is a very useful tool to get physical insight into antenna behavior. It is possible to easily obtain resonant frequencies, modal radiation Q or bandwidth, modal currents and modal radiation patterns. The paper is intended to study well known linear antennas under this new point of view.
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