Question: Consider an antenna with a (sin x / x) pattern. Let (x=(pi r sin theta) / lambda), where (r) is the antenna radius, (lambda) is

Consider an antenna with a \(\sin x / x\) pattern. Let \(x=(\pi r \sin \theta) / \lambda\), where \(r\) is the antenna radius, \(\lambda\) is the wavelength, and \(\theta\) is the off-boresight angle. Derive Eq. (3.92). Assume small \(x\), and expand \(\sin x / x\) as an infinite series.

Equation (3.92)

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