Study On The NVIS Antenna For The Mobile-vehicle

As a result of short-wave communications with low maintenance costs, the strong anti-destructive characteristics, so that in the military, armed police, public security, in areas such as flood relief has been widely used. In particular, our country is vast, relatively frequent geological disasters and other means of communication can not be guaranteed, short-wave communications role is particularly important. As a result of short-wave mobile communications vehicle, so that short-wave research is the development of on-board antennas of the urgent short-wave communications.First of all, the dissemination of electromagnetic waves from the point of view to introduce on-board short-wave radio communications there are"skip zone", as well as the reasons for the theory analysis of how to take measures to improve the communications blackout.Second, in the light of foreign short-wave antenna NVIS-board example antennas on the structure design, base on the large deflection theory, the relationship among the applied force, the vertical and aclinic displacements is obtained when the antenna deflects largely. And the simulation results are consistent with those by experiments. By utilizing the ANSYS software modeling, on the mast in the deformation process simulation analysis, to be non-linear deformation of the beam energy and deformation curves, and the results were analyzed.Finally, the sample of the antenna is fabricated, and can fufill all the design requirements, which is validated by a variety of performance tests.