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.