Direction Finding Using Multiple Sum and Difference Patterns in 4D Antenna Arrays

Figure 10

Measured normalized active element amplitude patterns of subarray 1 [denoted as 𝑃(𝑘,𝜃)].

(a) Element 1, 𝑃(1,𝜃)

(b) Element 2, 𝑃(2,𝜃)

(c) Element 3, 𝑃(3,𝜃)

(d) Element 4, 𝑃(4,𝜃)