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Antenna Assignment 1
1. The power radiated by a lossless antenna is 10 watts. The radiation intensity is given by
. Find
a. Maximum power density at a distance of 1000m.
b. Directivity of the antenna
c. Gain of the antenna.
2. For a given antenna, the radiation intensity is given by
( ) {
( )
for 0 ≤ Ø≤ 360
Find directivity using exact formula.
3. The normalized radiation intensity of a given antenna is given by,
a.
b.
The intensity exists only in the
a. Find the exact directivity
b. Azimuthal and elevation plane HPBW.
4. A linearly polarized wave travelling in the negetive z direction has a tilt angle of 450
It is incident upon an antenna whose polarization characteristics are given by
√ Find the polarization loss factor.
5. A
dipole with a total resistance of 1 ohm is connected to a generator whose internal
impedance is 50 + j25 ohms. Assuming that the peak voltage of the generator is 2V and
impedance of the dipole excluding the loss resitance, is 73 + j42.5 Ohms, find the power
a. Supplied by the source (real)
b. Radiated by the antenna
c. Dissipated by the antena.
6. An incoming wave with a uniform power density equal to is incident normally upon
a lossless horn antenna whose directivity is 20dB. At a frequency of 10GHz determine the
maximum possible power that can be expected to be delivered to a load connected to the horn
antenna. Assume no losses between the antenna and the load.