| 摘要 |
An omni directional antenna according to an embodiment of the present invention may include: a substrate; at least one upper antenna pattern formed on the substrate; a spiral antennal which is formed under the substrate and has at least one antenna pattern connected to the upper antenna pattern; and a monopole antenna which supports the spiral antenna and is connected to the spiral antennal. Therefore, the omni directional antenna according to an embodiment of the present invention can flow the current in three-dimensions to have an omni directional radiation characteristic, by forming the spiral antenna which has an upper antenna pattern and a lower antenna pattern on the upper surface and the lower surface of the substrate, respectively. |
