Theoretical analysis of the EAST 4-strap ion cyclotron range of frequency antenna with variational theory

Zhang Jia-Hui^{1, 2}, Zhang Xin-Jun^{1, †,}, Zhao Yan-Ping¹, Qin Cheng-Ming^{1, ‡,}, Chen Zhao^{1, 2}, Yang Lei^{1, 2}, Wang Jian-Hua¹

(a) Antenna impedance versus distance d − c. y₁ = 0.01 m, y₂ = 0.4 m, w = 0.1 m, b₁ = 0.02 m, b₂ − b₁ = 0.1 m, c − b₂ = 0.01 m; (b) Antenna impedance versus distance c − b₂. y₁ = 0.01 m, y₂ = 0.4 m, w = 0.1 m, b₁ = 0.02 m, b₂ − b₁ = 0.1 m, d − c = 0.01 m; (c) Antenna impedance versus distance b₂ − b₁. y₁ = 0.01 m, y₂ = 0.4 m, w = 0.1 m, b₁ = 0.02 m, c − b₂ = 0.01 m, d − c = 0.01 m; (d) antenna impedance versus distance b₁. y₁ = 0.01 m, y₂ = 0.4 m, w = 0.1 m, b₂ − b₁ = 0.1 m, c − b₂ = 0.01 m, d − c = 0.01 m.