Imaging devices and imaging methods by millimeter wave 3D holographic scanning

An imaging method of performing millimeter wave three-dimension 3D holographic scanning on an object to be inspected, comprising:

• conveying the object in a first direction by a conveying apparatus, so that the object passes through at least one millimeter wave transceiving module, wherein each millimeter wave transceiving module is arranged to have its longitudinal direction extend in a direction intersecting the first direction, and comprises a millimeter wave transceiving antenna array for transceiving millimeter wave signals;
• scanning the object by each millimeter wave transceiving module when the object passes through the millimeter wave transceiving module, so as to obtain scanned data of the object;
• and
• obtaining a millimeter wave holographic image of the object based on the scanned data,
• wherein the millimeter wave transceiving antenna array comprises a column of millimeter wave transmitting antennas and a column of millimeter wave receiving antennas, the two columns being arranged in parallel.