Title :
A novel compact UHF wideband antenna for near field electrical characterization of Steel Fiber Reinforced Concrete
Author :
Roqueta, G. ; Irteza, S. ; Romeu, J. ; Jofre, L.
Author_Institution :
Signal Theor. & Commun. Dept., Univ. Politec. de Catalunya
Abstract :
A novel, electrically small, UHF (350 MHz-750 MHz) microstrip slot antenna is presented. The antenna is designed for the characterization of steel fiber reinforced concrete (SFRC) segments. The antenna consists on a three layer structure headed by the slot ground plane, followed by the feeding microstrip in the central layer with some resistive loading for bandwidth enhancement purposes; finally on the bottom layer a strip line reflector is positioned to provide a unidirectional radiation pattern, required for harsh environments. The whole design has been optimized in front of SFRC for maximum impedance bandwidth. Input impedance and radiation pattern are studied both theoretically and experimentally, and some laboratory measurements have been done on real SFRC specimens. Satisfactory results for the fiber density of SFRC are presented.
Keywords :
UHF antennas; antenna radiation patterns; broadband antennas; electric field effects; fibre reinforced composites; microstrip antennas; reflector antenna feeds; reinforced concrete; slot antennas; steel; SFRC specimen; UHF wideband antenna; bandwidth enhancement; electrically-small UHF microstrip slot antenna; frequency 350 MHz to 750 MHz; maximum impedance bandwidth; microstrip antenna feeds; near-field electrical characterization; steel fiber reinforced concrete specimen; strip line reflector antenna; unidirectional radiation pattern; Antenna radiation patterns; Bandwidth; Broadband antennas; Concrete; Impedance; Loaded antennas; Microstrip antennas; Slot antennas; Steel; UHF antennas;
Conference_Titel :
Antennas and Propagation, 2009. EuCAP 2009. 3rd European Conference on
Conference_Location :
Berlin
Print_ISBN :
978-1-4244-4753-4
Electronic_ISBN :
978-3-00-024573-2
