Abstract
Previously, the broadband spiral class of antennas primarily consisted of the wire (or "printed")spiral and spirals with approximately complementary geometry. While both are very broadband radiators, they are still somewhat band-limited due to their associated balun structures, and bulky as a result of their absorbing cavities. A new type of spiral antenna utilizing slot radiating elements is presented that eliminates these drawbacks, relying instead on several new approaches to guarantee its frequency-independent operation over extremely broad bandwidths. The design and integration of a planar infinite balun/feed structure and very shallow reflecting cavity is presented and discussed, as is a new termination technique. Gain, axial ratio, and pattern measurements for both a 6" (15.24 cm)diameter spiral, with flow = 750 M Hz and 6.25:1 bandwidth, and an 18" (45.72lcm) diameter spiral, with flow = 250 M Hz and 15:1 bandwidth, are also given and reviewed.
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