ECE Board
Exam November 1999
Which of the
following is taken as the standard reference antenna for directive gain?
Isotropic
ECE Board
Exam April 1998
Best description
of a collinear and broadside antenna radiation pattern
Bidirectional
ECE Board
Exam November 1997
Theoretical gain
of a Herztian dipole
1.76 dB
ECE Board
Exam March 1996 it is a measure of the microwave power radiated from an antenna
as a function of angular direction from the antenna axis
Beamwidth
ECE Board
Exam November 2000
What would
you employ or use to determine the performance of an aerial antenna, such as
determination of propagation strength and direction?
Radiation pattern
ECE Board
Exam April 2000
Find the
approximate width of a pyramidal horn antenna that will operate at 10,000 MHz
intended to have a beamwidth of 10 degrees.
ECE Board
Exam April 1998
What is the
driven element of an antenna?
The element fed by the transmission line
ECE Board
Exam November 1997
The reflector
and director of an antenna array are considered as
Parasitic elements
ECE Board
Exam March 1996
What is the
gain of four identically polarized antennas stacked one above the other and fed
in phase?
6 dB over the gain of one antenna
ECE Board
Exam April 1998
What do you
mean by the outward flow of an energy from any source in the form of radio
waves.
Radiation
ECE Board
Exam November 1997
The product
of the power supplied to the antenna and its gain relative to a half-wave
dipole in a given direction.
ERP
ECE Board
Exam March 1996
Gain of an
isotropic antenna
0 dB
ECE Board
Exam April 1997
The frequency
of operation of a dipole antenna cut to length of 3.4 m.
ECE Board
Exam November 2000
What is the
term for a numerical ratio which relates the performance of one antenna to that
of another real or theoretical antenna?
Antenna gain
ECE Board
Exam April 2000
Which of the
following microwave antenna is normally used when obtaining an omni-directional
radiation requirement?
Bicone
ECE Board
Exam April 1998
Antenna which
is not properly terminated.
Resonant
ECE Board
Exam November 1997
Width measured
in degrees of a major lobe between ends of the lobe at which the relative power
is one half (-3dB) its value from the peak of the lobe.
Beamwidth
ECE Board
Exam April 1998
At the ends
of a half-wave antenna, what values of current and voltage exist compared to
the remainder of the antenna?
Maximum voltage and minimum current
ECE Board
Exam November 1997
Harmonic suppressor
connected to an antenna.
Low pass filter
ECE Board
Exam November 1997
Radio wave concentration
in the direction of the signal emitted by a directional antenna
Major lobe radiation
ECE Board
Exam November 2000
What is the
approximate length of a half wave dipole antenna radiating at 6450 kHz?
ECE Board
Exam April 2000
How does the
length of the director element of a parasitic element beam antenna compare with
that of the driven element?
It is about 5% shorter
ECE Board
Exam April 1998
Refers to a
type of beam antenna which uses two or more straight elements arranged in line
with each other?
Yagi antenna
ECE Board
Exam November 2000
One of the
following can be best attained by a trap antenna in radio communication
Multi frequency band operation
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