Flat antenna

The utility model provides a floor antenna which includes a feed-in part, a grounding part, a mutual resonance part, a first resonance part and a second resonance part. The grounding part and the mutual resonance part are respectively connected with the feed-in part. The first resonance part and the second resonance part are respectively connected with the mutual resonance part. The mutual resonance part comprises a sector part. A first operation route is defined to begin at the feed-in part, pass through the mutual resonance part and stop at the first resonance part; a second operation route is additionally defined to begin at the feed-in part, pass through the mutual resonance part and stop at the second resonance part. An empty cavity is formed between the feed-in part, the grounding part, the mutual resonance part and the first resonance part. In this way, the floor antenna of the utility model can provide a wider communication band and a lower return loss.