Experimental validation of high-permittivity ceramic double-ridged horn antennas for biomedical ultra-wideband diagnostics

Low-power ultra-wideband (UWB) radar sensors are attracting more and more attention, e.g., for biomedical diagnostics. In contrast to established techniques like X-ray tomography or invasive approaches, UWB radar offers the potential for remote access and, based on suitable waveforms, ultra-low power signal intensities. THis paper presents a complete characterization of a miniature ceramic double-ridged horn antenna. The input matching, radiation pattern, and impulse response reveal a performance promising for biomedical diagnostics. A further improvement and miniaturization will become accessible by optimized manufacturing processes and feed impedance, respectively. Preliminary volunteer measurements showed the suitability of the antennas for the envisaged applications and justify our approach.