Array antenna structure with simplified phase control and antenna product using the same

An array antenna structure, comprising:

• at least one multilayer dielectric substrate provided with a plurality of antenna units and a plurality of low-resolution phase control units, wherein each of the antenna units is configured to radiate at least one first radio-frequency (RF) signal to outside, receive at least one second RF signal from the outside, or radiate the at least one first RF signal to the outside and receive the at least one second RF signal from the outside, and each of the low-resolution phase control units is electrically connected to a corresponding one of the antenna units;
• at least one metal waveguide element having at least one cavity therein, joined to the multilayer dielectric substrate and configured to transmit and guide at least one of the at least one first RF signal and the at least one second RF signal;
• and
• at least one RF front-end module electrically connected to the metal waveguide element and the multilayer dielectric substrate, configured to make the antenna units to form at least one of at least one focused beam for transmitting RF signals and at least one beam mode for receiving external RF signals, and comprising:
• a frequency conversion unit configured to convert between low-frequency signals and high-frequency signals;
• a plurality of function amplification units, wherein each of the low-resolution phase control units is electrically connected to one of the function amplification units;
• and
• an unequal-length transmission line structure having different lengths of transmission paths, electrically connecting the frequency conversion unit to each of the function amplification units and configured to cause a phase delay in RF signals through the different lengths of the transmission paths, wherein at least one of the function amplification units is connected to the frequency conversion unit through a transmission line that has a length different from a length of a transmission line between another one of the function amplification units and the frequency conversion unit.