A synthetic uniform circular array, SUCA, method for synthesizing a vortex electromagnetic, EM, wave, the method comprising forming a radially placed uniform circular antenna array, UCA, with N elements, wherein N is an integer greater than 1, and then by rotating the array elements to various spatial locations, modifying their feeding phases, and superimposing the generated fields at various spatial locations, generating the vortex electromagnetic, EM, waves; wherein the method includes the following steps: arranging N antenna elements on a circular ring to form the UCA; feeding the N antenna elements at an initial position to emit EM waves with an initial phase; by rotating the array elements to various spatial locations and modifying their feeding phases, emitting phase-controlled EM waves; superimposing the EM waves emitted in step and step to generate vortex EM waves; wherein said step also includes determining an orbital angular momentum, OAM, mode number α' of the synthesized vortex EM wave, and determining the elements number Ns of a virtual synthesized antenna array; wherein Ns=kN, k>0, and k is an integer; wherein in said step, the phase of the EM wave emitted by the n th element is: α ′ ∗ 2 π n − 1 N, wherein 1 ≤ n ≤ N, and n is an integer; wherein the specific operation method of step is: rotating the antenna array around the central axis of the ring in a set direction, and feeding the N antenna elements for emitting the EM waves from the position after rotation; wherein the antenna array is rotated a total of s times, and the angle of each rotation is 2 π N s; and wherein after the antenna array is rotated for the i th time, the phase of the EM wave emitted by the n th antenna elements is: α ′ ∗ 2 π n − 1 N + α ′ ∗ 2 π N s ∗ i; wherein s= k -1; 1≤i≤s, and the rotation direction is clockwise or counterclockwise; the SUCA method being characterized in that the antenna element are linearly polarized antenna elements, and in that, in step, after each rotation of the antenna array, each antenna element is also rotated 2π/N s around itself in a direction which wherein the method includes the following steps: arranging N antenna elements on a circular ring to form the UCA; feeding the N antenna elements at an initial position to emit EM waves with an initial phase; by rotating the array elements to various spatial locations and modifying their feeding phases, emitting phase-controlled EM waves; superimposing the EM waves emitted in step and step to generate vortex EM waves; arranging N antenna elements on a circular ring to form the UCA; feeding the N antenna elements at an initial position to emit EM waves with an initial phase; by rotating the array elements to various spatial locations and modifying their feeding phases, emitting phase-controlled EM waves; superimposing the EM waves emitted in step and step to generate vortex EM waves; wherein said step also includes determining an orbital angular momentum, OAM, mode number α' of the synthesized vortex EM wave, and determining the elements number Ns of a virtual synthesized antenna array; wherein Ns=kN, k>0, and k is an integer; wherein in said step, the phase of the EM wave emitted by the n th element is: α ′ ∗ 2 π n − 1 N, wherein 1 ≤ n ≤ N, and n is an integer; wherein the specific operation method of step is: rotating the antenna array around the central axis of the ring in a set direction, and feeding the N antenna elements for emitting the EM waves from the position after rotation; wherein the antenna array is rotated a total of s times, and the angle of each rotation is 2 π N s; and wherein after the antenna array is rotated for the i th time, the phase of the EM wave emitted by the n th antenna elements is: α ′ ∗ 2 π n − 1 N + α ′ ∗ 2 π N s ∗ i; wherein s= k -1; 1≤i≤s, and the rotation direction is clockwise or counterclockwise; the SUCA method being characterized in that the antenna element are linearly polarized antenna elements, and in that, in step, after each rotation of the antenna array, each antenna element is also rotated 2π/N s around itself in a direction which