A transmitting antenna having an effective height of 100 meters has a current at the base 100 A at the frequency 300 kHz. Calculate
of
:
(D
The field strength at a distance of 100 km
(iD
The value of radiation resistance.
(c) How the directivity of an antenna is defined and what is the relation between directivity and gain of an antenna ?
EEC504/DNG-51945
fTurn Over
2.
Attempt any two parts of the following
(a)
:
(5x2:10)
Design a four element broadside array of ),lZ spacing between elements. Consider unit element as )"/2length antenna. Dlaw its radiation pattern and calculate its IIPBW.
(b) What is end-fire
aruay ? Deduce an expression
for the
radiation pattem of an end-fire array with n vertical dipoles.
(c)
What is meant by Dolph-Chebyshev distribution for a linear anay ? Show that such a distribution gives a minimum side
lobe level for a given beam-width of major lobe.
3.
Attempt any two parts of the following
(a)
:
(5x2:10)
A loop aerial for use at 500 kHz is of height 0.5 meter, width 0.5 meter and 25 turns, when directed to receive maximum signal the emf induced in the loop
is I50
What is the field strength of the signal picked up
(b) What is a rhombic
a
pv.
?
antenna ? Describe its construction and
properties with special reference to directivity and bandwidth.
(c)
Design Log-periodic Antenna of your own defined parameter. Describe microstrip antenna" What are its advantage and disadvanatge ? Describe any one feed method.
EEC504/DNG-51945
4.
Attempt any two parts of the following
(a)
(5x2=10)
:
Explain the important features of the Horn Antenna and the principle of its working. Describe Helical Antenna is
Normal rqode of operation.
(b)
Describe the parabolic antenna used at rnicrowave frequencies. Describe the methods offeeding aparaboloid
reflector in which the primary antenna is located at the focal point.
(c)
Describe the method of Radiation pattern measurement in the lab.
5.
Attempt any two parts of the following:
(a)
(5x2=10)
Find the skip distance for waves of frequency 4.6xl}6 Hz at a time when the
a value
of ix l0r'
maximum ionization in the E-region has e/m3 at a height
of
110 km.
(b) Define maximum usable frequency and derive an expression for the same in the case of a thin ionospheric layer over a plane earth"
(c)
Discuss the phenomenon of ground wave propagation at long and medium waves.
UPTU B.Tech Antenna and Wave Propagation EEC-501 Sem ...
(b) What is a rhombic antenna ? Describe its construction and. properties with special reference to directivity and. bandwidth. (c) Design Log-periodic Antenna of ...
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@y2. + 2jk. @fz. @z. = 0. (7.6). If we are given fz1(x; y), the solution of this partial di erential equation will give the amplitude distribution at z = z2. ... If we put back the full dependence on z and t we nd that in the paraxial approximation,
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Page 1 of 2. (Following Paper ID and Roll No. to be filled in your Answer Book). Printed Pages : 2. EIT5O5. B. Tech. (SEMESTER-V) TI{EORY EXAMTNATTOI\, 2012-13. INFORMATION SECTJRITY AND CYBER LAWS. Time:2Hoursl I Total Marks : 50. Section - A. l. At