| 摘要 |
An UWB(Ultra Wide Band) planar antenna is provided to expand a frequency bandwidth by controlling a gap between a first radiation device and a first ground part. A first radiation device(23) generates resonance at a first frequency band and a second frequency band. The first radiation device is formed into an L-shaped pattern. A second radiation device(25) generates resonance at a third frequency band. The second radiation device is formed into a bar pattern. Height of the first radiation device is higher than height of the second radiation device. A feed line(30) is extended from the second radiation device. A first ground part(12) is positioned one side of the feed line. A second ground part(15) is positioned the other side of the feed line. Bottom lines(12a,15a) of the first ground part and the second ground part are positioned in the same line. Top lines(12b,15b) of the first ground part and the second ground part are positioned in a different line.
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