E_{φ} = \sum_{n = 1}^{N} E_{n φ} = E_{0} \frac{\sin u}{u} \exp (i ω t) \sum_{n = 1}^{N} \exp [- i k (n - 1) d \sin φ]

${E_\varphi= \sum_{n=1}^N E_{n\varphi} = E_0 \frac{\sin u}{u} \exp(i \omega t) \sum_{n=1}^N \exp[-ik(n-1)d \sin \varphi]}$

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