Jaypee Institute of Information Technology (JIIT) 2008 B.E Electronics
JAYPEE UNIVERSITY OF INFORMATION TECHNOLOGY, WAKNAGHAT
Test-1
B.Tech(ECE), VI Semester
Course Name: Antenna Theory Course Code: EC 302 _
Max Marks: 20 Max Time: 1 hr
Note: Attempt a!! questions.
Q1. Define Directivity of the antenna.
The radiation intensity of an antenna is given by: C/(0,)cos40sin3- The radiation intensity exists only in the upper hemisphere. Find the maximum directivity of the antenna. [4]
Q2. What is the maximum power received at a distance of 0.5 km over a free space PGHz circuit consisting of a transmitting antenna with a 25 dB gain and a receiving antenna with a 20 dB gain? The transmitting antenna input is 150 W. [4]
Q3.With the help of potential functions, derive the expressions for radiated fields of an infinitesimal dipole. ** [6]
Q4. The radiation intensity of an antenna, with omnidirectional amplitude pattern and half power beam width of 90, is expressed by: U = sin"#. Determine the value of n and the maximum directivity of the antenna. [4]
Q5. Find the radiation resistance of an infinitesimal dipole whose overall length is Assume that the dipole antenna is radiating into free space. [2]
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