SRM University 2001 B.Tech Electronics and Communications Engineering Ec0305- antenna and wave propagation - Question Paper
This is the university ques. paper for antenna and wave propagation ,November 2011,5th semester.
BlTcfe. WEGRi'JE EXAMI.N VTION. NOVEMBER 2811 Fifth Semester
ECUS* ANTENNA AND WAVS PROPAGATION
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,-taswer AU Questions
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Wta k a beqaeacy jftJrpendwt jsmenna'?
Define Polarization.
Define: Gam of an Antenna
Find the iaree of Los svstem when the receive and cmsxnit rtnra heights arc 10m and 100m respectively. Define; Maximum L'saWe Frequency (MUFl
PART - B (5 x 16 - 80 Marks)
.. Derive the total power radiated bv a half wave dipole.
(10 Marks)
ii- Skew that the radiation resistance of half wave dipole is
fftr' j - *r*< (6Mis)
\ *
(OR)
State and prove [evipnjcKv mnmg uu itn > .
appHcarions
Derive the expression for the far field peUtetn of an am of 2-isotropic point stnirces.
(t> Equal amplitude aod phase (6 Mari:
t> Equal ampiinade and opposite phase <6 Mark; (&) Uratqual Mnpfetuje arai ae$ phase (4 Mark
(OH* ' 9 Pxrfain dr &>@cwHg:
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*8*CTS.
Wh .nett diagram explain she construction i of Ysc--ad* anienru.
Describe the methods form measuring the g] antenna.
(OR)
Write notes on:
(i) Phase movement (6%l
(ii) Directivity measurement (
(iii) Antenna efficiency measurement (4 \Ia
..
Kxplain briefly the various modes of propagatkw.||H
Discuss in detail about ionospheric abnormalities.
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