螺旋型天線

Array of four axial-mode helical antennas used as a satellite tracking-acquisition antenna, Pleumeur-Bodou, France

Helical antenna:

(B) Central support,

(C) Coaxial cable feedline,

(E) Insulating supports for the helix,

(R) Reflector ground plane,

(S) Helical radiating wire

螺旋形天線是一種由一個或多個導線纏繞而成的螺旋型天線。由一根導線所構成的螺旋形天線稱為單股天線；而由兩個或四個螺旋狀導線構成的天線則分別稱為雙股 (Bifilar) 或四股(Quadrifilar)螺旋天線。