Convert gain to effective aperture
A = gain2aperture(G,lambda)
the effective aperture in square meters corresponding to a gain of
A = gain2aperture(
for an incident electromagnetic wave with wavelength
be a scalar or vector. If
G is a vector,
a vector of the same size as
G. The elements
A represent the effective apertures for the
corresponding elements of
be a scalar.
Antenna gain in decibels.
Wavelength of the incident electromagnetic wave. The wavelength
of an electromagnetic wave is the ratio of the wave propagation speed
to the frequency. For a fixed effective aperture, the antenna gain
is inversely proportional to the square of the wavelength.
Antenna effective aperture in square meters. The effective aperture
describes how much energy is captured from an incident electromagnetic
plane wave. The argument describes the functional area of the antenna
and is not equivalent to the actual physical area. For a fixed wavelength,
the antenna gain is proportional to the effective aperture.
Compute Effective Aperture
An antenna has a gain of 3 dB. Calculate the antenna's effective aperture when used to capture an electromagnetic wave with a wavelength of 10 cm.
a = gain2aperture(3,0.1)
a = 0.0016
Gain and Effective Aperture
The relationship between the gain, G, in decibels of an antenna and the antenna’s effective aperture is:
where λ is the wavelength of the incident electromagnetic wave.
 Skolnik, M. Introduction to Radar Systems, 3rd Ed. New York: McGraw-Hill, 2001.
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