The invention belongs to the technical field of antennas, and relates to a common-
caliber dual-polarization tight
coupling array antenna capable of wide-angle scanning, which comprises a low-frequency
antenna array surface, a low-frequency vertical
branch knot, a low-frequency feed
balun, a high-frequency
antenna array surface, a low-frequency
feed network and a coaxial connector. According to the invention, a traditional ultra-
wideband tight
coupling array antenna is decomposed into two antennas with small bandwidths, and loading of resistive materials is avoided through common-
caliber configuration. Wherein an upper-layer low-frequency antenna unit is divided into a plurality of sub-units, electromagnetic transparency of a lower-layer high-frequency antenna is realized by adopting a winding line design, mutual interference of high and low frequencies is further inhibited by loading a vertical
branch knot, and the fractal low-frequency sub-units are synthesized into a large unit through a power divider. According to the dual-polarization ultra-
wideband antenna, the average efficiency reaches 85% in the working frequency bands of 2-6GHz and 7-18GHz, the active standing-wave ratio is smaller than 4 in the scanning range of + / -60 degrees, and the problem that in a traditional design, ultra-
wideband, high efficiency, wide-angle scanning and dual polarization cannot be achieved at the same time is solved.