Antenna, wireless communication device, and antenna forming method

An antenna comprising:

• a first half-wavelength element, a second half-wavelength element, and a third half-wavelength element that each have a length of a half-wavelength at an arbitrary frequency designated in advance, wherein
• the first half-wavelength element, the second half-wavelength element, and the third half-wavelength element are arranged in a three-orthogonal state in which the first half-wavelength element, the second half-wavelength element, and the third half-wavelength element are orthogonal to each other;
• an end portion of the first half-wavelength element is joined to a first end portion of the second half-wavelength element,
• a second end portion of the second half-wavelength element and an end portion of the third half-wavelength element are arranged in a non-contact state in mutually adjacent positions,
• a position of a feeding point for antenna power feeding is arranged in a central position of the third half-wavelength element, and
• the antenna is formed as a 1.5-wavelength twisted Z-shaped non-contact three-orthogonal dipole antenna.