Vol. 10 No 4 August 2002
Spiral Helix Antenna
Spiral helix antenna is a compact state-of-the-art circularly polarised antenna, which works over multioctave frequency bandwidth (1-18 GHz). The antenna size (38 mm diameter x 40 mm height) has been reduced by 50 per cent with respect to conventional spiral antenna (85 mm diameter x 58 mm height) used for the same frequency band. A sandwich hemispherical radome has been also designed and developed to protect the antenna from hostile environment. The radome is coated with anti-rain erosion paint for airborne applications. These antennas are best suited for DF and radar warning receiver applications. The size versus performance of this antenna demonstrates the development capabilities and technical excellence in the state-of-the-art antenna designs at DRDO. The antenna is manufactured by M/s CEL, Sahibabad.