Patent ID: 8085198

Claim:
A smart antenna system for receiving a broadcasting, comprising: an antenna body with changeable directivity; a control device that optimizes receiving conditions of the said antenna body by changing the directivity of the antenna body the control device comprises, a set-top box that connected to the antenna through a wire in order to receive the broadcast signals transmitted from the antenna body, and generates a first control signal for specifying the directivity of the antenna body corresponding to a selected channel, and a control box that outputs a second control signal for adjusting the directivity of the antenna body corresponding to the first control signal to the antenna body, the antenna body comprises a reception confirming section that replies a cognitive signal to the set top box through the wire in order to show that the antenna body received the second control signal, when the antenna body receives the second control signal transmitted from the control box; the set-top box comprises a failure determination section to determine that the antenna body fails, and a failure reporting section to notify that the antenna body fails based on a result from the failure determination section, the failure determination section measures the value of a supply voltage supplied to the control box when the cognitive signal is not received, and determines the antenna body fails when the measured value of the supply voltage is normal.