"' EIRP "'is differentiated from effective ( or equivalent ) radiated power ( ERP ) by use of absolute antenna gain in the calculation instead of relative antenna gain.
32.
When resistive losses are taken into account, particularly with small antennas, the antenna gain might be substantially less than the directivity, and the effective area is less by the same factor.
33.
Since electromagnetic radiation is dipole radiation, it is not possible to build an antenna that radiates coherently equally in all directions, although such a hypothetical isotropic antenna is used as a reference to calculate antenna gain.
34.
The ratio compares the antenna gain in a specified direction, " i . e . ", azimuth, usually that of maximum gain, to the gain in a direction 180?from the specified azimuth.
35.
Reflective array antennas usually have a number of identical driven elements, fed in phase, in front of a flat, electrically large unidirectional beam of radio waves, increasing antenna gain and reducing radiation in unwanted directions.
36.
In this case, rather than quoting the antenna gain, one would be more concerned with the " directive gain " which does " not " include the effect of antenna ( in ) efficiency.
37.
Deployment links of up to 5 miles ( 8 km ) from the base station are possible in some circumstances such as in point-to-point systems that can reach slightly farther distances due to increased antenna gain.
38.
Use of arrays for increasing antenna gain are an alternative to so-called " aperture antennas ", in which the gain is achieved using a single geometric structure, more akin to an optical focusing device.
39.
Where G _ t and G _ r are the antenna gains ( with respect to an isotropic radiator ) of the transmitting and receiving antennas respectively, \ lambda is the wavelength, and R is the distance between the antennas.
40.
"' P e "'is the Equivalent isotropically radiated power ( also known as EIRP ) in dBW . It depends on the output of the transponders of the satellite and the antenna gain of the transmitting antenna.
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