Antenna and antenna system

An antenna, comprising:

• a feeding network and a plurality of antenna units electrically connected with the feeding network;
• the feeding network comprises n stages of transmission components, and each stage comprises 2n−1 transmission components, where n≥1 and n is an integer;
• each transmission component comprises a first feeding unit, a first transmission line and a second transmission line;
• the first feeding unit comprises a main path portion, a first branch and a second branch, and both the first branch and the second branch are electrically connected with the main path portion;
• the first branch in the transmission component is electrically connected with the first transmission line, and the second branch in the transmission component is electrically connected with the second transmission line;
• in response to that n=1, the first transmission line and the second transmission line of each transmission component are respectively electrically connected with two different antenna units, and the antenna unit connected with the first transmission line is different from the antenna unit connected with the second transmission line;
• in response to that n>1, the first transmission line and the second transmission line of each transmission component in the nth stage are respectively electrically connected with two different antenna units, and the antenna units connected with first transmission lines and second transmission lines are different;
• the first transmission line and the second transmission line of each transmission component in an ith stage are electrically connected with two different main path portions in an (i+1)th stage respectively, and the main path portions connected with the first transmission lines and the second transmission lines are different, wherein 1≤i<n, and i is an integer, and wherein,
• at least part of the transmission components each further comprise a phase shift unit, in the transmission component comprising the phase shift unit, two ends of a first main line of the phase shift unit are respectively electrically connected with the first branch of the first feeding unit and the first transmission line, and two ends of a second main line of the phase shift unit are respectively electrically connected with the second branch of the first feeding unit and the second transmission line.