Low-profile composite material strip line antenna unit and Ku wave band array antenna

The invention relates to a low-profile composite material strip line antenna unit and a Ku wave band array antenna, and belongs to the field of radar and communication antennas. The antenna unit comprises a polyimide single-sided copper-clad laminate, PMI polymethacrylimide foam, a polyimide single-sided copper-clad laminate, PMI polymethacrylimide foam and a polytetrafluoroethylene glass cloth double-sided copper-clad plate, and is formed by bag-pressing and high-temperature gluing of six layers of planar materials with different thicknesses. Octagonal holes corroded by the upper polyimide copper-clad layer serve as the aperture of radiation of the antenna unit, the double-sided copper-clad layers of the polytetrafluoroethylene glass cloth plate and the metalized through hole array form a radiation cavity of the antenna unit, and the middle polyimide copper-clad layer plate serves as an antenna feeder to enable the pentagonal patch to extend into the radiation cavity for resonance. Electromagnetic waves are