Electrical characteristics of the new dual radiator antenna in Ku band

To meet the demand of antenna for underwater vehicle receiving high-speed data from sea surface in complex sea conditions, a design scheme of Ku band dual radiator antenna is proposed. The parasitic radiator is added in the orthogonal direction of the half-wave dipole antenna. Under the condition of limited antenna wire-to-diameter ratio, the parasitic radiator is used to improve the omni-directional performance of the antenna in complex sea conditions. By adjusting the spacing between the parasitic radiators of the antenna, the current distribution between different radiators of the antenna is connected. Through the approximate derivation of the current distribution on the oscillator, the specific structural parameters of the new dual radiator antenna are obtained, and the electrical characteristics of the new dual radiator antenna, such as the far field and direction pattern, are obtained. Through the electromagnetic simulation calculation, the electrical characteristics of the antenna are verified, and the actual measurement and comparison are made. The simulation and measurement results show that the underwater reflection coefficient of the new dual radiator antenna is less than 0.45 and the underwater gain is higher than −40 dBi in complex sea conditions, showing omni-directional above the horizontal plane. The measured results are in good agreement with the simulation results. The antenna has the characteristics of large wire-diameter ratio, omnidirectional and high underwater gain, which provides a novel antenna structure for the high frequency trailing antenna of underwater vehicle.