An antenna assembly, comprising: an excitation source, configured to generate an excitation signal; an antenna radiator, comprising a first end and an opposing second end, a first end face away from the second end, a second end face away from the first end, and a side surface connected between the first end face and the second end face, wherein the antenna radiator is configured to generate an electromagnetic signal according to the excitation signal; the antenna assembly comprising: a reference ground, disposed corresponding to the antenna radiator and adjacent to the first end and the side surface, wherein the reference ground comprises a first surface adjacent to the first end and an opposing second surface adjacent to the second end, the reference ground and the antenna radiator define a gap configured to be at least part of a clearance zone; a circuit board stacked on the second surface of the reference ground; a support body, arranged on the circuit board and extending along a direction from the first end to the second end; and a conductive sheet, coupled to the second end of the antenna radiator and the excitation source and configured to transmit the excitation signal from the excitation source to the antenna radiator, wherein the conductive sheet is arranged on the support body such that the conductive sheet is adjacent to the second end of the antenna radiator and wherein the support body extends from an end of the circuit board adjacent to the antenna radiator. an excitation source, configured to generate an excitation signal; an antenna radiator, comprising a first end and an opposing second end, a first end face away from the second end, a second end face away from the first end, and a side surface connected between the first end face and the second end face, wherein the antenna radiator is configured to generate an electromagnetic signal according to the excitation signal; the antenna assembly comprising: a reference ground, disposed corresponding to the antenna radiator and adjacent to the first end and the side surface, wherein the reference ground comprises a first surface adjacent to the first end and an opposing second surface adjacent to the second end, the reference ground and the antenna radiator define a gap configured to be at least part of a clearance zone; a circuit board stacked on the second surface of the reference ground; a support body, arranged on the circuit board and extending along a direction from the first end to the second end; and a conductive sheet, coupled to the second end of the antenna radiator and the excitation source and configured to transmit the excitation signal from the excitation source to the antenna radiator, wherein the conductive sheet is arranged on the support body such that the conductive sheet is adjacent to the second end of the antenna radiator and wherein the support body extends from an end of the circuit board adjacent to the antenna radiator. a reference ground, disposed corresponding to the antenna radiator and adjacent to the first end and the side surface, wherein the reference ground comprises a first surface adjacent to the first end and an opposing second surface adjacent to the second end, the reference ground and the antenna radiator define a gap configured to be at least part of a clearance zone; a circuit board stacked on the second surface of the reference ground; a support body, arranged on the circuit board and extending along a direction from the first end to the second end; and a conductive sheet, coupled to the second end of the antenna radiator and the excitation source and configured to transmit the excitation signal from the excitation source to the antenna radiator, wherein the conductive sheet is arranged on the support body such that the conductive sheet is adjacent to the second end of the antenna radiator and wherein the support body extends from an end of the circuit board adjacent to the antenna radiator.