- #1
Sze Wen
- 3
- 2
- Homework Statement
- (1)A hypothetical isotropic antenna is radiating in free-space. At a distance of 100m from the antenna, the total electric field in the theta direction is measured to be 5V/m. Find the distance 150m for
(a) Power density
(b) Power radiation
- Relevant Equations
- Wrad = 0.5(Ex H*)
Prad = close integral of Wrad dS
At 100m:
(a) 0.03315 W/m
(b)4166 W
Since E is inversely proportional to 1/r^2, then E at 150m is 2.22 V/m.
(a) 2.22/377= 0.00654 W/m
(b) 4*pi*r^2*Wrad= 1665 W
Is this reasoning correct?
(a) 0.03315 W/m
(b)4166 W
Since E is inversely proportional to 1/r^2, then E at 150m is 2.22 V/m.
(a) 2.22/377= 0.00654 W/m
(b) 4*pi*r^2*Wrad= 1665 W
Is this reasoning correct?
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