The tradeoff between radiation efficiency and antenna bandwidth, expressed in terms of Q-
factor for small antennas, is formulated as a multiobjective optimization problem in current …

Radiation efficiency of electrically small antennas largely depends on antenna geometry.
However, the actual mechanism that governs the antenna radiation efficiency remains …

Hybrid computational schemes combining the advantages of a method of moments
formulation of a field integral equation and T-matrix method are developed in this article. The …

Existing optimization methods are used to calculate the upper bounds on radiation efficiency
with and without the constraint on self-resonance. These bounds are used for the design …

This article proposes a new model based on the spherical wave expansion (SWE) theory to
synthesize efficient and highly directive endfire arrays of electric dipoles, which are known to …

The Chu circuit model provides the basis for analyzing the minimum radiation quality factor,
Q, of a given spherical mode. However, examples of electrically large spherical radiators …

A problem of the erroneous duality gap caused by the presence of symmetries is solved in
this article utilizing the point group theory. The optimization problems are first divided into …

The Chu circuit model provides the basis for analyzing the minimum radiation quality factor,
𝑸, of a given spherical mode. However, examples of electrically large spherical radiators …

Relative bounds on radiation efficiency are established for time-modulated antenna
systems, where radiation is generated by broadband conduction currents impressed using …

Tato práce se zabývá využitím vektorových sférických vln ke studiu charakteristických módů,
k určování principiálních limitů a dále také ke kombinaci metody momentů s T-maticovou …