equiangular spiral antenna

equiangular spiral antenna

[¦ē·kwē¦aŋ·gyə·lər ¦spī·rəl an′ten·ə] (electromagnetism) A frequency-independent broad-band antenna, cut from sheet metal, that radiates a very broad, circularly polarized beam on both sides of its surface; this bidirectional radiation pattern is its chief limitation.