Investigation on dual-armed sinuous antenna

A fully parameterized angularly zigzagged planar self-complementary dual-armed sinuous antenna with diameter D = 73.8 mm is optimally designed and simulated with Ansoft HFSS™ v.13. Ultra-wideband (S₁₁ ≤ -10 dB), good transient properties, full polarization, and high gain (5 dBi-7 dBi) are acquired within band 1.5 GHz-15 GHz. Three linearly polarized bands (AR≥30 dB): f₁=3.1 GHz (2.85 GHz-3.78 GHz, 30%), f₃ = 5.5 GHz (5.28 GHz-5.84 GHz, 10%), f₄ = 8.4 GHz, f₅ = 10 GHz (7.87 GHz-10.41 GHz, 25.4%) and two circularly polarized bands (AR≤15 dB): f₂ = 4.6 GHz (4.2 GHz-4.75 GHz, 12%, RHCP), f₆ = 13.4 GHz(11.54 GHz-15 GHz, 25.8%, LHCP) are obtained within this band. Gain patterns of these bands are all bidirectional in broadside (Theta = 0°) and almost azimuth-free in horizontal plane with 26°-140° axial ratio beam width. So it is very attractive to application in ultra-wideband multi-polarization systems, such as electronic warfare, track and guidance radar, radio astronomy and other communication systems.