Collinear antenna structure with independent accesses

Antenna structure for transmitting and/or receiving metric or decimetric frequency waves, comprising n collinear antennas, where n≤2,

• each antenna comprising a radiating portion comprising a first succession of i coaxial radiating elements about a first axis, alternating with at least an additional succession of i coaxial radiating elements, each additional succession being arranged about an axis that is different from the first axis, where i≤2,
• each antenna being independently powered by a coaxial cable at the level of an excitation input,
• each antenna comprising at least one lower quarter-wave trap arranged between the excitation input and a first end of the radiating portion, and at least one upper quarter-wave trap arranged at a second end of the radiating portion,
• at least a first antenna comprising at least n−1 hollow cores extending over the entire length, said hollow cores forming the axes of the successions of coaxial radiating elements and at least one of the hollow cores being configured to receive a coaxial cable intended to power another antenna that is collinear with the first antenna,
• at least an intermediate quarter-wave trap being arranged between two consecutive collinear antennas around a coaxial cable, and
• a terminal element, arranged at the second end of the radiating portion, after the upper quarter-wave trap, and formed of the hollow core or cores of the antenna.