Improving the Flare Perturbation Response of Gasket Monopole Antenna for Custom Frequency Solutions

Modifying the behaviour of a system to every time meet the changing needs of the customers require controlling its performance parameters. Owing to its self-similarity property, the Sierpinski Gasket fractal antenna has been used widely for multiband applications. The height, scale ratio and flare angle of Gasket geometry are the three parameters that control the multiband performance of this antenna. The antenna performance over the flare perturbations, however, degrades as a result of inefficient matching. This paper describes the improved performance of the flare angle variants of a Sierpinski Gasket fractal antenna that has been achieved using a microstrip line feed. The different flare angle variants of a Gasket antenna with largest Gasket height of 88.9 mm have been shown to exhibit an improved return loss at most of the frequencies. The improvement is highest at
$\mathrm{f}_{1}$
of both the
$\Theta_{0}= 45^{\circ}$
and
$\Theta_{0}=60^{\circ}$
Gasket antenna, and at f
2
of the
$\Theta_{0}=75^{\circ}$
variant. These structures have also been investigated for radiation pattern and gain properties. The gain of the designed antennas increases from
$\mathrm{f}_{1}$
to
$\mathrm{f}_{4}$
. The improvement in the flare perturbation response of the Gasket antennas, as reported in present work, will make the design considerations more flexible, thereby providing novelty to the present work.