| a frequency independent antenna whose conducting surfaces have shapes generated by equiangular spirals having a common axis and the same defining parameter
NOTE 1 – The antenna usually has two arms fed by a balanced feedline. It may have multiple pairs of arms. A common design requires two pairs oriented 90° apart about their common axis and fed in phase quadrature.
NOTE 2 – The arms of the spirals can conform to planar or conical surfaces, in which case they are referred to as planar or conical equiangular spiral antennas respectively.
NOTE 3 – These antennas are usually designed so that the non-conducting portion of the surface to which the antenna conforms is of the same shape and size as the spiral arms. This design is said to be self-complementary.
|