ZZAG SLOT ANTENNA WITH CPW FEED

zig zag slotI currently use z zag harrows on the back of my tine drills to fill the slots. Unlike most z zags though, they are hung on four chains. As the harrow is pulled back, the chainsdielectric 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 to