Phase shifter and antenna

A phase shifter, which is divided into a first feeding region, a second feeding region and a phase-shift region, wherein the phase shifter comprises a first substrate and a second substrate arranged opposite to each other, and a dielectric layer between the first substrate and the second substrate;

• the first substrate comprises a first base substrate, and a signal line and a reference electrode provided on a side of the first base substrate close to the dielectric layer;
• and the signal line and the reference electrode are located in the phase-shift region;
• the signal line comprises a main structure and at least one branch structure connected to the main structure, and the at least one branch structure extends along an extending direction of the main structure;
• the second substrate comprises a second base substrate, and at least one patch electrode provided on a side of the second base substrate close to the dielectric layer and located in the phase-shift region;
• the at least one patch electrode is provided corresponding to the at least one branch structure to form at least one variable capacitor;
• and an orthographic projection of the at least one patch electrode on the first base substrate at least partially overlaps with an orthographic projection of the at least one branch structure on the first base substrate;
• wherein the phase shifter further comprises:
• a first feeding structure and a second feeding structure, the first feeding structure being electrically coupled to one end of the signal line, and the second feeding structure being electrically coupled to the other end of the signal line;
• the first feeding structure being located in the first feeding region;
• and the second feeding structure being located in the second feeding region;
• and
• at least one recess formed in the first base substrate and/or in the second base substrate;
• the at least one recess located at an edge of the first feeding region and/or at an edge of the second feeding region, and each of the at least one recess being filled with a conductive structure.