| 摘要 |
A mechanically simple dual-frequency (or wide band) quadrifilar helix antenna (1). It includes four helix shaped radiating elements (2-5) where each helix element consists of two or more parallel helices (2a, 2b, 3a, 3b, 4a, 4b, 5a, 5b) of different lengths that are in galvanic contact at, or close to, the feeding point (2c, 3c, 4c, 5c). The four feeding points (2c, 3c, 4c, 5c) of the helix elements (2-5) are located at the bottom of the helix, meaning that the feedings of the helix elements are located at the end (6) of the helix pointing in the direction opposite to the direction of its main radiation.
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