The present invention discloses a
millimeter-wave high-
gain and high-
radiation-efficiency
slot antenna array based on a
ridge gap
waveguide. The
millimeter-wave high-
gain high-
radiation-efficiency
slot antenna array comprises an upper layer structure, a middle layer structure and a lower layer structure, wherein the uppermost layer is an all-
metal radiation unit layer manufactured through
machining and is composed of 16 inverted trapezoidal slot radiation units at equal intervals; the middle layer is a substrate integrated
waveguide high-order mode
resonant cavity feed layer processed by a multilayer
printed circuit board technology, and the substrate integrated
waveguide high-order mode
resonant cavity feed layer is composed of an upper planar structure, a middle planar structure and a lower planar structure. A
metal printing surface with rectangular gaps is arranged above the substrate integrated waveguide high-order mode
resonant cavity feed layer. A
dielectric substrate with periodically arranged
metal through holes is arranged in the middle, and a metal plate with four rectangular
coupling holes is arranged below the
dielectric substrate; and the bottommost layer is a machinedridge gap waveguide
feed network layer and comprises a metal
ridge line, metal pins surrounding the metal
ridge line and a metal bottom plate. The whole
antenna array is small in size, light in weight and high in integration level, and high
gain and
high radiation efficiency are realized in a working bandwidth.