7/23/2019 Antenna and Ce MID SEM PAPER

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  IES COLLEGE OF TECHNOLOGY, BHOPAL

EC( 6th  SEM ) MID SEM -1

Antenna & wave propagation (EC-604)Attempt all qe!tion

Q.1 (a)What is antenna array explain its importance . (RGPV 2008)

(b)explain radiation phenomenon.( (RGPV 2009)(c)defne isotropic radiator fnd the re!"ired expression o# electric feld #or

it. (RGPV 2008)

(d) Pro$e that radiation resistance o# hal# %a$e dipole is &' ohm. (RGPV

200809')

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Q.2 (a) *xplain radiation pattern #or small c"rrent element. (RGPV 2008)

(b) *xplain reciprocity thorem #or antenna. (RGPV 20)

(c)+eri$e the re!"ired expression o# retarded $ector potential #or hert,ian

dipole.

(d)+eri$e the expression #or *lectric - manetic feld o# small c"rrent

element. (RGPV 200)

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Q.3 (a) *xplain the #ollo%in term (RGPV 2008090')

.directi$ity 2.radiation intensity '.radiation density /.hal# po%er

beam%idth

(b)alc"late po%er radiated by 1 dipole in #ree space i# it carries a

"ni#orm c"rrent o# 00cos 3t amperes. What is its radiation

resistance - e##iciency .i# loss resistance is 45. (RGPV 202)

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  IES COLLEGE OF TECHNOLOGY, BHOPAL

EC( 6th  SEM ) MID SEM -1

Commni"ation engineering (E#-601)Attempt all qe!tion

Q.1 (a)*xplain enery and po%er sinal . (RGPV 2008)

(b)*xplain mod"lation %hy its need.( (RGPV 2009)

(c)fnd #o"rierr trans#orm o# G67* #"nction o# %idth 27 - amplit"de "nity.

(RGPV 2008)

(d)%rite all properties o# o"rier trans#orm - pro$e time scalin property.

(RGPV 200809')

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Q.2 (a) %hat is random $ariable. (RGPV 2008)

(b) *xplain !"adrat"re n"ll eect. (RGPV 20)

(c)explain s!"are la% mod"lator #or eneration o# 6: sinal. (RGPV 200)

(d)Write the demod"lation methods o# +;<=; *xplain anyone method.

(RGPV 20)

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Q.3 (a) compare +;<=; ;;< - 6:.( (RGPV 202))

(b)*xplain time domain e!"ation #or 6:+;<=;;;< :od"lation %ith its

#re!"ency spectr"m

6nd defne mod"laton e>ciency (RGPV 20)

(c) ind the o"rier trans#orm o# (i) 2 e=bt"(t) (ii) 4 ;n (t)

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7/23/2019 Antenna and Ce MID SEM PAPER

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(iii) / ;in2 ?#t