At a distance of 20 m from a hypothetical isotropic antenna is radiating in free space, the total electric field (Eθ) is measured to be 1.5 V/m. Find the(a)    power density (Wrad) and(b)    power radiated (Prad)

A radiated power of 5 W is produced by a resonant antenna. Its directional radiation intensity represented by: U = B0cos3θ (W/unit solid angle)    0 ≤ θ ≤ π/2;  0 ≤ ϕ ≤ 2πFind the(a)    maximum power density (in W/m2) at a distance of 1500m (assuming far field distance).(b)    Directivity of the antenna (dimensionless and in dB)(c)    Gain of the antenna with an efficiency of 85% (dimensionless and in dB)

A GSM1800 cell tower antenna is transmitting 20W of power in the frequency range of 1840 to 1845MHz. The gain of the antenna is 17dBi. Find the power density at a distance of  50m. Select one:a. 31.8m W/m2b. 41.8m W/m2c. 21.8m W/m2d. 51.8m W/m2

Consider a half-wave dipole that is radiating into free space when the origin is at the centre of the dipole and its axis is aligned with the z axis. The input power fed to the dipole is 300 W. If we assume that the dipole has an efficiency of 75%, calculate the power density at point P(r,θ,φ) of the spherical coordinate system with r = 300 m, θ=75° and φ=45°.

An AM radio station broadcasts isotropically (equally in all directions) with an average power of 3.60 kW. A receiving antenna 75.0 cm long is at a location 4.00 mi from the transmitter. Compute the amplitude of the emf that is induced by this signal between the ends of the receiving antenna. mV How is the emf related to the electric field produced at the antenna?

The figure above shows the radiation pattern of an antenna in linear scale.a). If the main lobe magnitude is 4.1, calculate the magnitude of its half power point. b). If the main lobe magnitude is 7 dB, calculate the magnitude of this new half power