Page 1 of 1
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-V EXAMINATION WINTER 2018
Subject Code:X51101 Date: 30/11/2018
Subject Name: Antenna Wave Propagation
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1

Define HPBW, BWFN and Effective Aperture Area.
03

Define Antenna field zones. Differentiate Far and Near field. field.Differentiate Far field and Near field Differentiate Far field and Near field Differentiate Far field and Near fieldDifferentiate Far field and Near field.
04

For two element array consisting identical radiators carrying equal currents in phase. Obtain positions of maxima and minima of the radiation pattern if the distance of separation d λ.
07
Q.2

Explain: Directivity, Antenna efficiency, Radiation resistance.
03

Explain principle of Pattern multiplication.
04

Derive Radiation Resistance of Loop Antenna.
07
OR

Explain the construction of Helical Antenna.
07
Q.3

Explain different types of Reflector Antennas.
07

With neat sketches briefly explain reflector lens antennas. Write its applications.
07
OR
Q.3

Explain Yagi-Uda Array-Function and its design.
07

Enlist applications of reciprocity theorems to antennas. Briefly explain any two applications
07
Q.4

State and explain babinet's principal with example
07

Explain different types of Horn Antenna.
07
OR
Q.4

Derive Friss transmission formula in a radio communication link with Transmitting Antenna and a Receiving Antenna.
07

Explain Micro strip Patch Antenna.
07
Q.5

Explain detailed structure of Ionosphere.
07

Explain MUF and Virtual height. Derive the expression.
07
OR
Q.5

Explain different types of wave propagation.
07

Write short notes on Fading, Tropospheric scattering and critical frequency.
07