FERRITE-LOADED CIRCULAR WAVEGUIDE ANTENNA FOR 3D SCANNING

摘要

The ferrite-loaded circular waveguide antenna for 3D scanning includes the design and optimization of an axially magnetized ferrite loaded circular waveguide antenna with three-dimensional (3D) scan characteristics. The ferrite cylinder is concentrically placed within the circular waveguide and magnetized using solenoid coils wound around the waveguide. The waveguide antenna is excited using an optimally positioned coaxial connector. By changing the magnetic biasing of the ferrite cylinder, individual modes within the multi-mode wave guide are affected separately. This generates tapered E_y-field distribution in the radiating edge of the waveguide, which leads to beam scan. Professional software is used to optimize the dimension and magnetizing requirement of the antenna to realize up to ±30° of beam scan in the azimuth and elevation planes. The magnetizing fields (H₀) required for the 3D scan are tabulated. A prototype of the high power antenna is fabricated to experimentally verify the simulated scan characteristics.