Log-periodic dipole array antenna and smart skin having the same

A smart skin configuring an appearance of a fuselage of an aircraft, the smart skin comprising:

• a radar dome exposed to an outside, and having a glass fiber composite material and a metal mesh to cover the glass fiber composite;
• a supporter coupled to an inner surface of the radar dome;
• and
• an antenna interposed between the radar dome and the supporter,
• wherein the radar dome has the same curvature as that of a surface of the fuselage of the aircraft to reduce a radar cross section, and
• wherein the antenna is implemented as a log-periodic dipole array antenna configured to operate in a multi-frequency band, the antenna comprising:
• a dielectric substrate;
• a radiating element having a plurality of lines extending from a center to an outer side and symmetrically arranged on the dielectric substrate based on the center, so as to resonate in a first frequency band and a second frequency band, the plurality of lines being connected at the center or the outer side of the radiating element in an alternating manner, the lines becoming longer going from up to down of the radiating element fed according to a predetermined long-periodic ratio;
• and
• a band stopper formed on one point for connecting the lines to each other.