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1. A reconfigurable antenna, comprising: a partial reflection part of which a reflection coefficient is greater than a transmission coefficient; a total reflection part arranged on one side of the partial reflection part, wherein a resonant cavity is formed between the partial reflection part and the total reflection part, and an electromagnetic wave is reflected back and forth in the resonant cavity, during the reflection of the electromagnetic wave back and forth in the resonant cavity and when the electromagnetic wave forms a constructive interference, a phase angle of the electromagnetic wave tends to be consistent for radiation to penetrate the partial reflection part; a partial transmission part of which a transmission coefficient is greater than a reflection coefficient, the partial transmission part being arranged on one side of the partial reflection part facing away from the total reflection part, wherein the electromagnetic wave of which the phase angle tends to be consistent is shaped to radiate into a space; and a radiation part arranged in the resonant cavity, the radiation part radiating the electromagnetic wave; wherein the total reflection part comprises: a first substrate; a first metastructure layer arranged on one side of the first substrate; and a grounded metal surface arranged on one side of the first substrate facing away from the first metastructure layer; wherein the partial reflection part comprises: a second substrate arranged at a position facing the first substrate; a second metastructure layer arranged on one side of the second substrate facing the first substrate; and a third metastructure layer arranged on one side of the second substrate facing away from the first substrate; wherein the second substrate, the second metastructure layer, and the third metastructure layer together form a first metainterface to realize a resonance condition; wherein the partial transmission part comprises: a third substrate arranged at a position facing the second substrate; a fourth metastructure layer arranged on one side of the third substrate facing the second substrate; and a fifth metastructure layer arranged on one side of the third substrate facing away from the second substrate; wherein the third substrate, the fourth metastructure layer, and the fifth metastructure layer together form a second metainterface such that the electromagnetic wave of which the phase angle tends to be consistent passing through the third substrate, the fourth metastructure layer, and the fifth metastructure layer realize to regulate a beam reconstruction condition with same or different time delays.
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