Stylianos C. Panagiotou Themistoklis D. Dimousios Christos N. Capsalis Analysis and design of an ESPAR antenna above perfect ground, wire grid plate and wire grid plate with skirt. 32-37 2006 conf/iastedCSN/2006 Communication Systems and Networks db/conf/iastedCSN/iastedCSN2006.html#PanagiotouDC06