Abstract: An antenna structure includes a low frequency radiator, a high frequency radiator, and a connecting element. The connecting element has a rear end and a front end opposite to the rear end. A feeding element and a grounding element are extended from the front end of the connecting element and arranged adjacent to each other. The low frequency radiator includes a substantially inverted-L shaped first radiating part extended from the rear end of the connecting element, a meander-like second radiating part extended frontward from a front end of the first radiating part, and a substantially lying U-shaped third radiating part with a rearward opening extended from a free end of the second radiating part. The high frequency radiator includes a first extension piece extended frontward from the front end of the connecting element and located under the second radiating part with space.

Abstract: A multi-band antenna includes a first radiator resonating at a high frequency bans and a second radiator extended from a first end and toward a second end of the first radiator, and resonating at a low frequency range. An opening slot is formed between the first and the second radiators. A connecting slot and an end slot are formed in the second radiator. The width of the connecting slot is wider than the width of the opening slot. The connecting slot can prevent vectors potential caused by the second radiator from being neutralized. The electromagnetic coupling effect over the opening slot caused by the first radiator and the second radiator can pull down the low frequency range for reducing the size of the second radiator. Therefore, the multi-band antenna has a small size.

Abstract: An antenna adapted for a digital television includes a base board defining a grounding region on a surface thereof, an antenna element made of conductive material and disposed on the base board, and a circuit disposed on the grounding region of the base board. The antenna element meanders like a plurality of series-connected zigzags along a lengthwise direction of the base board and gradually increases a transverse length thereof in process of meandering to show a substantially trapezoid outline. The circuit is electrically connected with one end of the antenna element having a shortest transverse length. That can increase frequency bandwidth of electromagnetic waves received, instead of extra metal parasitical elements. So the antenna can reduce the manufacture cost and make the structure simpler.

Abstract: A digital television antenna includes a ground plane, a first receiving portion, a second receiving portion, a linking portion, a first connecting strip, a longitudinal receiving strip, a second connecting strip, a feed-in portion and a coupling portion. The grounding plane, the longitudinal receiving strip, the first connecting strip, the first receiving portion, the linking portion, the second receiving portion, the second connecting strip and the feed-in portion compose a unit which can receive a frequency range between 470 and 650 MHZ wireless signal, and the coupling portion couples with the unit to receive a frequency range between 650 and 890 MHZ wireless signal. Therefore, the digital television antenna can receive the 474-858 MHZ range wireless signal which is used in the digital television field.