Utilizing Symmetry of Planar Ultra-Wideband Antennas for Size Reduction and Enhanced Performance


??????With the increasingly new ultrawideband applications, antenna researchers face huge challenges in coming up with novel
operational geometries. Monopole and quasi-monopole antennas are seen to be the most compact and easily incorporable
resolution for transportable devices taking the benefits of printed circuit board techniques. Most antennas of
such type have symmetrical structures. It is doable to attain wider operating bandwidths by meeting symmetry conditions&#thirteen; whereas chopping the antenna into halves for a compact structure. However, there's no generalized means of applying
such a way. This paper addresses this issue by proposing a common feeding technique that may be&#thirteen; applied to any antenna, which is miniaturized using its symmetrical structure. The proposed technique allows feeding
the halved structure to attain wider and better impedance matching than the reported full-size antennas. The
theory of characteristic modes is applied to quasi-monopole structures to get an insight of the antennas??€™ mechanism.
The radiation patterns are also correlated with modal current distributions to perceive the radiation characteristics
of the changed structure. Finally, the strategy is implemented on some example antennas to illustrate its

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