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| un:reciprocity-theorem [2024/07/14 21:10] – created asad | un:reciprocity-theorem [2024/07/14 21:10] (current) – asad | ||
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| In many cases in radio astronomy, we do not care about the phase relationship between voltage and current and, hence, the **weak** reciprocity theorem is enough which relates the two interpretations of the [[beam]] of a radio telescope: | In many cases in radio astronomy, we do not care about the phase relationship between voltage and current and, hence, the **weak** reciprocity theorem is enough which relates the two interpretations of the [[beam]] of a radio telescope: | ||
| - | $$ G(\theta, | + | G(θ,ϕ)∝Ae(θ,ϕ) |
| where G is the gain and Ae the collecting area. For a lossless isotropic antenna the average area is simply λ2/(4π) and the average gain is unity. So | where G is the gain and Ae the collecting area. For a lossless isotropic antenna the average area is simply λ2/(4π) and the average gain is unity. So | ||
un/reciprocity-theorem.1721013037.txt.gz · Last modified: 2024/07/14 21:10 by asad