An antenna, comprising: a main body, wherein the main body comprises a top board and a bottom board that are disposed in parallel, wherein multiple radiation structures used for signal leakage are provided on the top board, and a feed structure used for signal excitation is provided on the bottom board, to generate, between the top board and the bottom board, a TE wave and a TM wave that are transmittable; and characterised in that it comprises multiple lines of gain compensation structures, for partitioning the main body into at least two radiation areas, wherein each radiation area comprises a portion of said multiple radiation structures and each line of gain compensation structure comprises multiple gain compensation units and a shielding structure extending at both sides of the gain compensation units and located between the top board and the bottom board to isolate the at least two radiation areas, and each gain compensation unit comprises: a first coupling structure, wherein the first coupling structure is located on a side of the shielding structure that is nearer to the feed structure, and at least a portion of the first coupling structure is located between the top board and the bottom board; a second coupling structure, wherein the second coupling structure is located on a side of the shielding structure that is farther from the feed structure, and at least a portion of the second coupling structure is located between the top board and the bottom board; and a first single stage traveling wave amplifying unit, wherein when the first single stage traveling wave amplifying unit is working, an input end of the first single stage traveling wave amplifying unit is connected to the first coupling structure and an output end of the first single stage traveling wave amplifying unit is connected to the second coupling structure. a main body, wherein the main body comprises a top board and a bottom board that are disposed in parallel, wherein multiple radiation structures used for signal leakage are provided on the top board, and a feed structure used for signal excitation is provided on the bottom board, to generate, between the top board and the bottom board, a TE wave and a TM wave that are transmittable; and characterised in that it comprises multiple lines of gain compensation structures, for partitioning the main body into at least two radiation areas, wherein each radiation area comprises a portion of said multiple radiation structures and each line of gain compensation structure comprises multiple gain compensation units and a shielding structure extending at both sides of the gain compensation units and located between the top board and the bottom board to isolate the at least two radiation areas, and each gain compensation unit comprises: a first coupling structure, wherein the first coupling structure is located on a side of the shielding structure that is nearer to the feed structure, and at least a portion of the first coupling structure is located between the top board and the bottom board; a second coupling structure, wherein the second coupling structure is located on a side of the shielding structure that is farther from the feed structure, and at least a portion of the second coupling structure is located between the top board and the bottom board; and a first single stage traveling wave amplifying unit, wherein when the first single stage traveling wave amplifying unit is working, an input end of the first single stage traveling wave amplifying unit is connected to the first coupling structure and an output end of the first single stage traveling wave amplifying unit is connected to the second coupling structure. a first coupling structure, wherein the first coupling structure is located on a side of the shielding structure that is nearer to the feed structure, and at least a portion of the first coupling structure is located between the top board and the bottom board; a second coupling structure, wherein the second coupling structure is located on a side of the shielding structure that is farther from the feed structure, and at least a portion of the second coupling structure is located between the top board and the bottom board; and a first single stage traveling wave amplifying unit, wherein when the first single stage traveling wave amplifying unit is working, an input end of the first single stage traveling wave amplifying unit is connected to the first coupling structure and an output end of the first single stage traveling wave amplifying unit is connected to the second coupling structure.