| 摘要 |
An annular antenna is composed of a ground plane, a short-circuit conductor, a radiation conductor and a parasitic conductor. The radiation conductor has a connection member and a feeder member. Two ends of the short-circuit member are respectively connected to the ground plane and connection member. The feeder member is close to the ground plane and has a notch. The short-circuit conductor and radiation conductor run along the ground plane defining an in-annular area. The radiation conductor has a first coupling edge beside the in-annular area. The parasitic conductor is inside the in-annular area with one end coupled to the ground plane and a second coupling edge along the first coupling edge. The first and second coupling edges have a gap therebetween. The radiation and parasitic conductors respectively excite low-frequency and high-frequency resonant modes. The annular antenna covers multiple frequency bands, has UWB features and simplified structure and favors mass-production.
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