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Unformatted text preview: Assignment 8 November 5, 2009 1. An Antenna has eld pattern given by E ( θ ) = cos 2 ( θ ) for ≤ θ ≤ 90 . Plot the pattern and nd the beam area of this pattern. 2. A plane wave is incident on a short dipole with its axis along y direction. The wave is assumed to be linearly polarized with E in the y direction. The current on the dipole is assumed to be constant and in the same phase over its entire length, and the terminating resistance R T = R r . The antenna loss is assumed to be zero. What is (a) dipole's maximum e ective aperture area. (b) directivity. 3. A radio link has 15W transmitter connected to an aperture of 2 . 5 m 2 e ective aperture at 5GHz. The receiving antenna has an e ective aperture of . 5 m 2 and is located at a 15-km line of sight distance from the transmitting antenna. Assuming lossless, matched antennas, nd the power delived to the receiver. 4. Field distribution of a loop antenna is given by E = E sin ( θ ) . N such antennas are placed at a distance of d from each....
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This note was uploaded on 09/12/2010 for the course EE EE645 taught by Professor Ujin during the Spring '10 term at YTI Career Institute.
- Spring '10