Design and production of super low frequency magnetic receiving antenna

Abstract

At present, the submarines employ towed antennas to receive super low frequency(SLF) signal, which not only limits the mobility and safety of submarine, but also exists receiving blind zone. On account of the advantages of magnetic antenna, such as small size, high sensitivity and strong anti-jam capacity, it is proposed to receive SLF signals. In accordance with the structure and working principle of the magnetic antenna, simplified equivalent circuit model is established. By means of analyzing parameters of the core and coils, magnetic antenna which works between 30Hz and 200Hz is designed. In order to reduce distributed capacitance, winding method is analyzed and optimized and group winding solution is proposed subsequently. By measuring the sensitivity in the circumstance of uniform magnetic field, the measurement value shows that the method has effectiveness on reducing distributed capacitance and raising resonant frequency.