Design of a New UHF Receiving Antenna for Underwater Vehicle

Aiming at the disadvantage of the gain difference of the underwater satellite signal received by the towed antenna of the underwater vehicle, a new type of dual-radiator antenna, which can increase the gain of the receiving antenna in seawater by adding a parasitic radiator, is designed, which can effectively improve the gain of the receiving antenna underwater and reduce the reflection coefficient. The models of the half-wave dipole antenna and the new double-radiator antenna are established and the indexes such as reflection coefficient, gain, and direction graph are simulated. A real antenna and a test platform are built, and the gain simulation results are verified by using the reduced-scale model method and double antenna comparison method. Simulation and experimental results show that the new dual-radiator antenna is a towed antenna suitable for the underwater vehicle to receive satellite signals in the 344MHz~351MHz band.