Dual-frequency shared-aperture radiation unit and antenna

A dual-frequency shared-aperture radiation unit, comprising:

• a feed base, comprising a metal base and a feed balun, wherein the feed balun is embedded in the metal base and the feed balun is connected to an external unit;
• a first-frequency-band radiator, disposed at the metal base, wherein the first-frequency-band radiator comprises at least one polarization composed of a symmetrical dipole binary array;
• a first-frequency-band feed group, comprising multiple first feed members, wherein an end of one first feed member is connected to one first-frequency-band dipole, and ends of two first feed members of the same polarization not connected to the first-frequency-band dipole are combined to the feed balun to feed the first-frequency-band radiator;
• a second-frequency-band radiator, embedded in the first-frequency-band radiator and disposed at the metal base, wherein the second-frequency-band radiator comprises at least one polarization composed of a symmetrical dipole binary array;
• and
• a second-frequency-band feed group, comprising at least one second feed member, wherein one second feed member is disposed corresponding to a second-frequency-band binary array of one polarization to feed the second-frequency-band radiator.