Patent ID: 7928911

Claim:
A digital television (DTV) antenna apparatus built in a portable device, wherein the portable device has a system ground plane, comprising: a ground plane with a short circuit point, wherein the ground plane is the system ground plane; an extending metal arm with a grounding point, wherein the extending metal arm connects with the short circuit point; a radiation element to receive the frequency in the range from 470 MHz to 870 MHz, wherein the radiation element and the ground plane are arranged in parallel to each other, further comprises: a radiation arm with a feeding terminal; and a parasitic arm including a first body and a first extending arm, wherein the first extending arm extends from one side of the first body and is almost perpendicular to the side, the first extending arm is extended to connect with the short circuit point, a cross section constructed by the first extending arm and the side has an appearance similar to a step, wherein the radiation arm includes a second body and a second extending arm, the second extending arm extends from one side of the second body and is almost perpendicular to the side, a cross section constructed by the second extending arm and the side has an appearance similar to a step.