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

7. Define Radiation Pattern of antenna

The centre of a half-wave dipole is placed at the origin of the standard spherical coordinate system with the wire parallel to the z axis. This centre-fed dipole is in resonance at 0.9 GHz and the total radiated power is 200 W.(a) Calculate the effective height vector in the xy plane (θ = 90°).(b) Find the electric field vector (peak value) radiated by the dipole in the far-field region.(c) A second similar dipole is also placed in the xy plane parallel to the first at a distance of 1500 m. Neglecting losses and assuming the free-space condition, calculate the voltage U (peak value) induced in the dipole, i.e. the voltage in the equivalent receiving circuit.(d) Based on the voltage U, calculate the maximum rms power available at the matched load

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)

eight of the antenna is proportional to __________.*λ/2λ/4λsqrt(3)*λ/4

Given a 10 isotropic element mounted one above another so that the axis of the array is along the z-axis with a separation of 0.6 \lambda\ between the elements. All elements are fed with the same amplitudes and phases.(a)  Write the expressions for the normalized array factor.(b)  Calculate the angle(s) of maximum radiation for the array. What type of radiation is produced by this array?(c)  Calculate the angle(s) of null radiation for the antenna array.(d)  Calculate and sketch the first-null beamwidth and half-power beamwidth for the principal lobe of the array.(e)  Neglecting mutual impedance effects, calculate the directivity of the array.