# Is the ratio of the power density incident on the

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• cornell2000
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is the ratio of the power density incident on the receiving station at a distance or range R to the equivalent isotropic power density or the average power density radiated in all directions at that range. The receiving antenna intercepts some of the power density incident upon it, producing an output signal with some amount of power. The factor that expresses how much power is its effective area, A eff = P rx ( W ) /P inc ( W/m 2 ) . The effective area has units of area and is sometimes (but not always) related to the physical area of the antenna. This picture is modified somewhat for a radar link, which also involves some kind of target. The transmitter and receiver are also frequently collocated in a radar, as shown in Figure 1.2. Here, the transmitter and receiver share a common antenna connected through a transmit-receive (T/R) switch. P inc ( W/m 2 ) = P tx G tx 4 πR 2 P scat ( W ) = P inc σ radar bracehtipupleft bracehtipdownrightbracehtipdownleft bracehtipupright ( m 2 ) 8

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• Spring '13
• HYSELL
• The Land, power density, Solid angle

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