The invention discloses a miniaturized CTS
flat panel array antenna. The miniaturized CTS
flat panel array antenna comprises a
radiation layer, a
waveguide power dividing layer, a mode conversion layer and a
feed network layer which are sequentially arranged from top to bottom, and is characterized in that the mode conversion layer comprises a first
metal flat panel and a mode conversion cavity array arranged at the upper surface of the first
metal flat panel, the mode conversion cavity array is formed by arranging n<2> mode conversion cavities according to an n*n mode, the
feed network layer comprises 4<n> H-type single
ridge waveguide power dividing networks, two rectangular
waveguide-single
ridge waveguide
converters and an E-plane waveguide power divider, wherein n is an integer which is greater than or equal to 1, each H-type single
ridge waveguide power dividing network is provided with an input end and four output ends, and the rectangular waveguide-single ridge waveguide converter is provided with a rectangular waveguide input end and a single ridge waveguide output end. The miniaturized CTS flat panel array antenna is small in size and simple in
processing and assembling process on the basis of having wide
frequency band, high
gain and high efficiency.