Wideband Antenna Design and Performance Analysis Using CST Simulations

This paper has presented the design and analysis
of a wideband rectangular-shaped antenna using FR-4 as the
substrate, optimized for ultra-wideband (UWB) applications. The
antenna’s performance has been measured using the reflection
coefficient (S11) through 3 GHz to 11 GHz, with CST simulations
which have shown an excellent impedance match, achieving a
minimum S11 of −24.84 dB at 9.44 GHz and −20.95 dB at 4
GHz, indicating good impedance matching at lower frequencies.
Notably, S11(5) has demonstrated near-perfect impedance matching with S11 = −48 dB at 9 GHz, making it suitable for UWB and
advanced wireless systems. When the surface current at 4 GHz
and 9 GHz has been analyzed, it has been found to be evenly
spread out at 5 GHz for broad radiation and concentrated at
9 GHz for higher directivity. These results have demonstrated
how well the antenna has performed over a wide range of
frequencies. This paper has demonstrated the antenna’s superior
impedance matching and wideband performance, applicable in
indoor positioning, short-range communication, radar sensing,
high-speed data transmission, through-wall radar, and medical
or security imaging, thereby underscoring the significance of
simulation-based design in advanced wireless technologies