Ultra-Wideband Spiral Antenna for Multi-Purpose RF Systems

Le résumé fourni par la source

Wideband antennas operating from 400 MHz to $\mathbf{5 G H z}$ are essential for multifunctional wireless systems, enabling applications such as communication, short-range radar, electronic warfare, and ground-penetrating radar. Designing such antennas requires ultra-wide bandwidth, stable radiation patterns, and circular polarization to ensure reliable performance across diverse scenarios. In this work, a compact two-arm archimedean spiral antenna is proposed and optimized to cover the $\mathbf{4 0 0 ~ M H z - 5}$ GHz range, simultaneously supporting deep penetration at lower frequencies, fine-resolution imaging at higher frequencies, and versatile wireless operation. Simulation and experimental results demonstrate wideband impedance matching with $S_{11}$ below 10 dB and circular polarization with an axial ratio below 3 dB across most of the band. The antenna achieves a gain of 6-10 dBic, enabling effective operation for subsurface sensing, wireless communication, radar detection, and electronic warfare. Its compact geometry, wideband performance, and robust circular polarization make it suitable for integration into multifunctional platforms supporting a variety of sensing and communication applications.

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