| CPC H01Q 9/0407 (2013.01) [H01Q 15/16 (2013.01)] | 20 Claims |

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1. A detection device, comprising:
a dielectric substrate, comprising a ground element, wherein the dielectric substrate has a first surface and a second surface opposite to each other;
a reception antenna, disposed on the first surface of the dielectric substrate;
a transmission antenna, disposed on the second surface of the dielectric substrate; and
a reflector, wherein the reflector is adjacent to the reception antenna;
wherein the ground element is disposed between the reception antenna and the transmission antenna.
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