zig zag slotdielectric substrate with elliptical slots. A z-zag strip feed of 50 Ω connected to the port with a tuning stub for feeding. The purpose of using a tuning stub in a slot antenna is toTest your reflexes and agility as you guide a rolling ball through an endless zzag path in this challenging arcade game. In Z Zag, your goal is to keep the ball moving along the zzag