Abstract: Provided is an unmanned aerial vehicle for evacuating people from a skyscraper, including: an aerial body unit including an evacuating cage in which a boarding space for evacuating people is formed; a main thrust unit having a form in which a propeller is coupled in a cylindrical structure and installed on both sides of the aerial body unit to take off and raise the aerial body unit by main thrust generated by the propeller; an auxiliary thrust unit having the form in which the propeller is coupled in the cylindrical structure and installed on a rear surface of the aerial body unit and horizontally moving the aerial body unit by auxiliary thrust generated in a vertical direction to an outer wall of the building by the propeller to approach the aerial body unit to the outer wall of the building; and a vacuum adsorption unit installed on a front surface of the aerial body unit and detachably fixed to the outer wall of the building through vacuum adsorption.

Abstract: Provided are complex elements for an antenna of a radio frequency repeater and a dipole array circular polarization antenna using the same. The complex elements for the antenna of the RF repeater include: a plurality of radiation members which are separated from one another by a predetermined angular distance and has a radiation portion and a leg portion, the radiation portion comprising a pair of parallel portions, which are separated from each other in a vertical direction and are disposed to be parallel to each other, and a connection portion, which is disposed to be perpendicular to the pair of parallel portions and connects ends of each of the pair of parallel portions, and the leg portion extending from the radiation portion; and a plurality of feeding members, each of the feeding members connected to each of the radiation members that face each other, among the plurality of radiation members.

Abstract: Provided are complex elements for an antenna of a radio frequency repeater and a dipole array circular polarization antenna using the same. The complex elements for the antenna of the RF repeater include: a plurality of radiation members which are separated from one another by a predetermined angular distance and has a radiation portion and a leg portion, the radiation portion comprising a pair of parallel portions, which are separated from each other in a vertical direction and are disposed to be parallel to each other, and a connection portion, which is disposed to be perpendicular to the pair of parallel portions and connects ends of each of the pair of parallel portions, and the leg portion extending from the radiation portion; and a plurality of feeding members, each of the feeding members connected to each of the radiation members that face each other, among the plurality of radiation members.