F.Y. M.Tech. (Electronics and Telecommunication Engg.)
(Semester (New CBCS) Examination, 2018
antena design and applications
Day and Date Thursday, 6-12-2018 Total Marks 70
Time 10.00 a.m. to 1.00 p.m.
Instructions All questions are compulsory.
Figures to the right indicate full marks.
Assume suitable data if required.
section i
1. Attempt any two questions.
State the importance of pattern multiplication. Explain with an example.
Explain effect of dielectric constant of material on efficiency and bandwidth
of microstrip antenna in detail.
S tate advantages of Antenna array. Explain different types of arrays in
detail.
2. Attempt any one question.
E xplain the parameters related to antenna array.
Directivity
Beamwidth and null directions
Array factor.
Derive the expression for Electric field intensity at a point due to two Non
isotropic sources vertically placed and having equal amplitude and out of
phase to each other.
Set P
3. Attempt any three questions.
S tate the parameters are to be considered at the time of designing rectangular
microstrip antenna. Explain the design procedure of antenna.
Derive the expression for electric field intensity due to n elements of isotropic
sources.
Find the null to null beamwidth and directivity of Broadside and End-fire
array for length L 10 λ and number of elements N 20.
Explain Cavity model for the analysis of microstrip antenna.
section iI
4. Attempt any two questions.
Write a note on composite material substrate used for microstrip antenna
fabrication.
State the parameters affected on bandwidth of antenna and explain how
selection of shape of patch is affected on antenna bandwidth.
State and explain antenna design considerations for Global Positioning
System application.
5. Attempt any one question.
State the techniques used for broadbanding of antenna. Explain in detail
coplanar parasitic element broadbanding technique.
S tate the different feeding excitation techniques are used for antenna.
Explain any one in detail.
6. Attempt any three questions.
Explain in brief Antenna design considerations for terrestrial mobile
communication system.
Explain transmission line modeling for aperture coupled microstrip
antenna.
Explain about substrate characteristics for Microstrip antenna.
S tate and explain the design considerations for Satellite Communication
Antenna.