8/13/2019 ant-qbank

1/5

EC2353- ANTENNA AND WAVE PROPAGATION

QUESTION BANK

UN I T I - RAD I A TI O N F IE L DS O F W I R E A N T E NN A S

PART-A

1.A.1 . What is an elementary dipole antenna and how does it differs from infinitesimalDipole. (M-13)

1.A.2 . What is the effective area of a half wave dipole operating at 1 !"# (M-13)1.A.3 . What is the effective length of linear antenna#1.A.$ . %f the radiation resistance of an antenna is &' ohms and loss resistance is 1

ohms find its efficiency# ( *-12)

1.A.' . Define !alf +ower ,eam width. ( *-12)1.A.& . Define monopole.(M-12)1.A. . An antenna has the field pattern given y /(0) cos2 0 for 0 . 4ind

!+,W.1.A.5 . Define Directivity and effective apert6re of an antenna.1.A. . Define gain and directivity of an antenna.1.A.1 What is the significance of radiation resistance of an antenna#

PART-B

1.,.1 /7plain the principle of 8eciprocity as applied to an antenna. (M-13)

1.,.2 Derive the wave e96ation and o tain its sol6tion. (M-13) (M-1 1.,.3 Derive the e7pression for the radiated fields of a center fed half wave dipole

antenna. :;etch the radiation pattern. (M-13) 1.,.$ Derive the /lectric and Magnetic field components of !ert"ian dipole. (*-12)

1.,.' Define and e7plain in detail the terms

8/13/2019 ant-qbank

2/5

8/13/2019 ant-qbank

3/5

2.,.5 Derive the e7pression for field pattern of roadside array of n point so6rces.

2.,. Derive the field 96antities and radiation resistance of a half wavelength dipole.

UNIT-III APERTURE ANTENNAS

PART-A3.A.1 :tate !6ygens principle.3.A.2 What are the feat6res of pyramidal horn antenna#

3.A.3 :tate the ,a inets principle.

3.A.$ What are the limitations of lens antenna#

3.A.' :tate Eni96eness theorem.3.A.& What are the field "ones#

3.A. What are the feat6res of slot antenna#

3.A.5 :tate the ,a inets principle and how it gives rise to the concept of complementary

Antenna.3.A. ?he apert6re si"e of pyramidal horn are 127& cm and operating at a fre96ency of

1 !". 4ind the eam width and Directivity.3.A.1 @ompare flat reflector and corner reflector.

PART-B

3.,.1 /7plain the radiation mechanisms of slot antenna with diagram.

3.,.2 /7plain the special feat6res of 8eflector antenna and disc6ss on different types offeed 6sed with neat diagram.

3.,.3 /7plain the radiation mechanisms of Microwave !orn antenna with diagram.3.,.$ With field e96ivalence principle e7plain 8adiation mechanism

3.,.' Descri e the wor;ing of slot antenna. What is the terminal impedance of slot

antenna#

3.,.& What is reflector antenna# With necessary diagrams e7plain para olic reflectorantenna and its different types of feeding system# !ow is apert6re loc;age in

reflector antenna avoided#

3.,. /7plain the principle of rectang6lar horn antenna with a neat s;etch. Draw vario6s

types of horn str6ct6re.

3.,.5 /7plain how a para oloidal antenna gives a highly directional pattern.3.,. /7plain in detail a o6t the feeding str6ct6re of para olic reflector antenna.3.,.1 Write short notes on i) slot antenna ii) lens antenna.

8/13/2019 ant-qbank

4/5

8/13/2019 ant-qbank

5/5