1：Experimental Design and Method Selection:

The paper reviews and compares three antenna designs for generating OAM beams: circular patch array, Vivaldi connecting array, and microstrip ring antenna. Theoretical models such as the array factor for uniform circular arrays and mode excitation in microstrip rings are employed.

2：Sample Selection and Data Sources:

Fabricated prototypes of the antenna arrays and microstrip ring antennas are used, with designs based on prior research.

3：List of Experimental Equipment and Materials:

Antenna elements (e.g., patch antennas, Vivaldi antennas), substrates (e.g., FR4 board), feeding networks, and measurement setups for observing field distributions.

4：Experimental Procedures and Operational Workflow:

Antennas are designed and fabricated; field distributions are observed at specific axial distances (e.g.,

5：8λ for arrays, 5λ for microstrip rings) to visualize OAM states. Data Analysis Methods:

Analysis involves comparing transversal electric field distributions for different OAM states, using theoretical equations and visual inspection of helical beam patterns.