| 摘要 |
A receiving antenna is provided to increase the electric wave reception density by concentrating the electric wave on the reception unit of a base. A receiving antenna includes a base(10) and a plurality of rings(30). The base includes a receiver(12) for receiving the electric wave. The plurality of rings are protrusively formed in the upper surface of the base. The plurality of rings form the concentric structure around the receiving unit of the base. The height of the plurality of rings is gradually reduced from a core part of a base to an edge. A groove(20) is formed between adjacent rings. An inner circumference of each ring is formed in a vertical direction with regard to the base. The width of the uppermost part except the innermost ring of the plurality of rings is identical to the width of the uppermost part of the groove.
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