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天线功率波瓣[Antenna Power Pattern] [2005-11-7]
iamet 发表在 Ω〖物理〗
| Also called the beam pattern, pattern function, or weighting function. It can be defined from the observed flux density equation
 (1)
where  is the antenna pattern normalized such that
 (2)
The factor of  is sometimes absorbed into the definition of  , so that
 (3)
More rigorously, the antenna pattern is defined by the antenna's response to a point source at  . Let  be the measured (complex) electric field,
 (4)
Therefore, is also a function of polarization. The diffraction pattern for a circular aperture (or antenna) is
 (5)
for small  . Let
 (6)
For small x, use
 (7)
so
  
 (8)
so
  
 (9)
Now,
  
(10)
So, for small x,
 (11)
The beam width is
 (12)
so
 (13) |
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