TY JOUR TI Nondestructive Testing of Dielectric Materials using an Active Reflecting Microwave Array KW microwave testing KW microwave imaging KW antenna arrays KW beam steering KW time reversal signal processing JO NDT World AU Tayebi, A.. AU Chahal, P.. AU Udpa, L.. AU Udpa, S.. PY 2019 IS 22 PB LLC SVEN