Ultra-wideband Vivaldi antenna design for multisensor adaptive ground-penetrating impulse radar.

This paper describes a partially dielectric-loaded Vivaldi antenna (PDVA) structure that maintains ultra-wideband antenna characteristics over a bandwidth ratio greater than 25:1 so as to improve the impulse radiation characteristics for multisensor adaptive ground-penetrating Radar (GPR) operations. The PDVA is introduced for metal-detector-combined GPR head designs in order to avoid performance degradations based on the sensor interferences. It is shown that high gain, low input reflection, and signal-ringing levels over the wide operational bands are attainable for a PDVA with proper dielectric and absorber loadings. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 834–839, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21491 [ABSTRACT FROM AUTHOR]