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 toHere's how the Z Zag System works: Step One: Observe the slot machine reels for a few minutes. Step Two: Look for a z zag pattern in the symbols on the screen. Step Three: