Patent ID: 7804456

Claim:
An ultra wideband loop antenna for use in the lower band of an UWB system comprising an antenna element having a linear first arm having opposite ends and which is cut off at the center to have two cut ends which are connected respectively to a couple of transmission lines, linear second and third side arms each having opposite ends, one of which being connected respectively with the opposite ends of the first arm, and a linear fourth arm which is connected with each of the other of the opposite ends of the second and third arms thereby to form a planar square or rectangular loop, wherein, the antenna composed of a single metallic layer is printed on the top of a substrate and the coupled tapered transmission line is printed on the top of the same substrate, wherein the transmission lines are tapered, and wherein a L shape portion is formed by widening partially or wholly the width of one of the side arms and the fourth arm in comparison with the other side arm and the first arm.