| abstract |
The invention provides a broadband filtering unit, which comprises a grounding support seat, a feed balun and a square radiation surface, wherein the front and back surfaces of the square radiation surface are coated with copper, the shape of the front coated copper is similar to that of a four-combined square structure, two square structures positioned on a diagonal line form two oscillator arms in a polarization direction, the middle position of each oscillator arm is completely hollowed, each oscillator arm consists of a plurality of LC circuits connected in series, and a plurality of open-circuit filtering branches are also arranged on the oscillator arms; meanwhile, by adjusting the LC circuit position and the length of the filtering branch section on the radiating surface of the unit, the expansion of different frequency bands and the filtering of different frequency bands can be realized. |