Radiation element structure

A radiation element structure disposed on a reflector, the structure comprising:

• a radiation unit comprising a dielectric portion formed of a plastic material and first to fourth radiating arms disposed on one side of the dielectric portion in a four-sided symmetrical structure;
• and
• a plurality of balun units each comprising a balun body connecting the reflector and the radiation unit, a feed line disposed on an upper surface of the balun body to feed the radiation unit, and a ground disposed on a lower surface of the balun body,
• wherein the radiation unit further comprises a plurality of sub-grounds each disposed between adjacent radiation arms, and
• wherein the sub-grounds are each connected to the ground.

An antenna comprising:

• a reflector;
• a radiation unit comprising a dielectric portion formed of a plastic material, first to fourth radiating arms disposed on one surface of the dielectric portion, and a plurality of sub-grounds respectively disposed between adjacent radiating arms in a four-sided symmetrical structure;
• and
• a plurality of balun units each comprising a balun body connecting the reflector and the radiation unit, a feed line disposed on an upper surface of the balun body to feed the radiation unit, and a ground disposed on a lower surface of the balun body and connected to a corresponding one of the sub-grounds.