IES COLLEGE OF TECHNOLOGY, BHOPALEC ( 6 th SEM ) MID SEM -1

Antenna & wave propagation (EC-604)

Attempt any five question, each question carry five marks. Q.1 What is Radiation Resistance .Prove that radiation resistance of half wave dipole is 73 ohm. RGPV

2010

Q.2 Explain retarded vector potential for small current element. derive the expression forElectric & magnetic field of small current element.

RGPV 2007/11

Q.3 Calculate power radiated by λ/16 dipole in free space if it carries a uniform current of 100cos ωt amperes. What is its radiation resistance & efficiency .if loss resistance is 5Ώ.

RGPV 2008

Q.4 Explain the following term(any three)1.directivity2.radiation intensity3.relation between far field and near field4.reciprocity theorem

RGPV2008/11/12

Q.5 Find the FNBW and HPBW for broadside linear array and end fire linear array consisting of 40 elements with λ/2 spacing and λ/4 spacing respectively.

RGPV2011

Q.6 Explain the antenna arrays; why we use, give the various forms of it?

(a) broad side array, (b)end fire array (c) binomial array

RGPV2010

IES COLLEGE OF TECHNOLOGY, BHOPALEC ( 6 th SEM ) MID SEM -1

Antenna & wave propagation (EC-604)

Attempt any five question, each question carry five marks. Q.1 What is Radiation Resistance .Prove that radiation resistance of half wave dipole is 73 ohm. RGPV

2010

Q.2 Explain retarded vector potential for small current element. derive the expression forElectric & magnetic field of small current element.

RGPV 2007/11

Q.3 Calculate power radiated by λ/16 dipole in free space if it carries a uniform current of 100cos ωt amperes. What is its radiation resistance & efficiency .if loss resistance is 5Ώ.

RGPV 2008

Q.4 Explain the following term(any three)1.directivity2.radiation intensity3.relation between far field and near field4.reciprocity theorem

RGPV2008/11/12

Q.5 Find the FNBW and HPBW for broadside linear array and end fire linear array consisting of 40 elements with λ/2 spacing and λ/4 spacing respectively.

RGPV2011

Q.6 Explain the antenna arrays; why we use, give the various forms of it?

(a) broad side array, (b)end fire array (c) binomial array

RGPV2010