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瓣宽[Beam Width] [2005-11-15]
iamet 发表在 Ω〖物理〗
The antenna (main) beam solid angle is denoted .
(1)

where is the modified antenna pattern. Using the approximate antenna pattern
(2)


(3)

Now let
(4)

(5)

(6)

and
(7)

Plugging in,

(8)

In terms of full width,
(9)

To find the half power width,
(10)

(11)

(12)

so the full power width is
(13)

To express this in terms of the Gaussian standard deviation , note that
(14)

so
(15)

Using the full Airy pattern instead of the approximate Gaussian,
(16)

where
(17)

(16) has solution , so
(18)
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