Communication device and millimeter wave holographic antenna

The invention relates to a communication device and a millimeter wave holographic antenna. The millimeter wave holographic antenna comprises a scattering unit, a high dielectric constant material plate and a feed network assembly. When an excitation signal is applied to the excitation port and a preset load is connected to the load port, the feed network assembly can correspondingly generate and output a TEM wave, and when the TEM wave passes through the high dielectric constant material plate, the high dielectric constant is used for increasing the reflectivity of the strip line waveguide and reducing the propagation speed of the TEM wave. Under the effect of TEM waves, each first gap opening on the scattering unit can generate excitation, which is equivalent to a plurality of first unit antennas, and the excitation at the openings of the plurality of first gaps can be mutually superposed, that is, radiation patterns of the plurality of first unit antennas are superposed, so that a specified high-gain patter