Planar ESPAR Array Design with Nonsymmetrical Pattern by Means of Finite-Element Method, Domain Decomposition, and Spherical Wave Expansion

Figure 5

(a) 3D Polar normalized power pattern (values 20 dB below maximum are not represented) and (b) 3D Directivity pattern by means of CST MWS (absolute value in dB), respectively, for an array with prescribed maximum at ϕ = 0 and θ = 30° and a attenuated value 7 dB below the maximum at ϕ = 180 and θ = 30°. Loading reactances: 𝑗𝑋₁=9.52𝑗Ω, 𝑗𝑋₂=−42.55𝑗Ω, 𝑗𝑋₃=84.39𝑗Ω, 𝑗𝑋₄=242.69𝑗Ω, 𝑋₅=66.39𝑗Ω, and 𝑋₆=−45.83𝑗Ω. Both cases have been compared with the results obtained by CST Microwave Studio.

(a)

(b)