| CPC H01Q 1/50 (2013.01) [H01Q 5/35 (2015.01); H01Q 9/0435 (2013.01)] | 9 Claims |
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1. A dual-frequency antenna structure, comprising:
a substrate including a first layer and a second layer;
a grounding element disposed on the second layer, wherein the grounding element has a first through hole and a second through hole that are spaced apart from each other;
a conductive sheet disposed on the first layer;
a transmitting antenna disposed on the substrate, the transmitting antenna including:
a first coupling conductive pad disposed between the first layer and the second layer, wherein the first coupling conductive pad corresponds in position to the first through hole;
a first conductive column electrically coupled to the first coupling conductive pad and the conductive sheet; and
a first feeding conductive pad located in the first through hole, wherein the first feeding conductive pad and the first coupling conductive pad are jointly configured to produce one series capacitive effect, and the first feeding conductive pad and the grounding element are jointly configured to produce one parallel capacitive effect, so as to generate a left-handed circular polarization; and
a receiving antenna disposed on the substrate, the receiving antenna including:
a second coupling conductive pad disposed between the first layer and the second layer, wherein the second coupling conductive pad corresponds in position to the second through hole;
a second conductive column electrically coupled to the second coupling conductive pad and the conductive sheet; and
a second feeding conductive pad disposed on the second layer and located in the second through hole, wherein the second feeding conductive pad and the second coupling conductive pad are jointly configured to produce another series capacitive effect, and the second feeding conductive pad and the grounding element are jointly configured to produce another parallel capacitive effect, so as to generate a right-handed circular polarization.
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