The invention belongs to the technical field of high-frequency
millimeter wave
wireless communication, and discloses a high-frequency
millimeter wave three-dimensional
integrated antenna array based on an LTCC (Low Temperature Co-Fired
Ceramic) process, which comprises a transition
interface layer, a feed layer and a
radiation layer which are sequentially stacked together from bottom to top, the
radiation layer is provided with N step
radiation resonant cavities which are mutually independent and face a
free space and are in an
inverted pyramid shape, the feed layer is provided with a first excitation module, a
broadband H-face SIW power divider and a second excitation module which are communicated in sequence, and the transition
interface layer is provided with a
waveguide transition interface step
resonant cavity which faces a
metal waveguide and is in an
inverted pyramid shape. The
waveguide transition interface stepped
resonant cavity is communicated with the first excitation module; the waveguide transition interface stepped
resonant cavity, the first excitation module, the
broadband H-plane SIW power divider, the second excitation module and the stepped radiation resonant cavity form a
bidirectional transmission path of electromagnetic
waves. According to the invention,
broadband matching can be realized, high-order
resonance in the cavity can be suppressed, and the
antenna gain is higher.