Multi-beam antenna and multi-beam antenna array system including the same

A multi-beam antenna comprising:

• a dielectric substrate;
• and
• a radiating part which includes a first radiating element and a second radiating element formed on the dielectric substrate so as to radiate electromagnetic waves,
• wherein the first radiating element includes a first upper radiating member which is formed on an upper portion of the dielectric substrate at one side based on a first direction of the dielectric substrate, and a first lower radiating member which is formed on a lower portion of the dielectric substrate at the other side based on the first direction of the dielectric substrate, and the second radiating element includes a second upper radiating member which is formed on the upper portion of the dielectric substrate at one side based on a second direction of the dielectric substrate, and a second lower radiating member which is formed on the lower portion of the dielectric substrate at the other side based on the second direction of the dielectric substrate,
• the multi-beam antenna further comprising:
• a connecting part which includes a semi-ring-shaped first connecting portion that connects the first upper radiating member and the second upper radiating member, and a semi-ring-shaped second connecting portion that connects the first lower radiating member and the second lower radiating member.