WorksheetsANTENNA ARRAYS
Total questions: 10
Worksheet time: 5mins
In order to draw field pattern, directions of maxima can be calculated using the formula
E=0
E=1
E=1/2
none of thee above
In order to draw field pattern, directions of HPPD can be calculated using the formula
(a)
In array of point sources with equal amplitude and opposite phase the difference in phase is _______ degree
0
90
180
270
In array of point sources with unequal amplitude and any phase the assumption is made by taking any one source as (a) with respect to far field region.
Array pattern is defined as the factor by which the array _______ the field strength over that of a single element radiating the _____ total power
increase & same
decrease & same
increase & different
decrease & different
Beam Width can be calculated by
angle between first nulls
2* angle between first nulls
A & B correct
A & B incorrect
Disadvantage of uniform linear array is
when array length decreases, side lobes will appear
when array length increases, side lobes will disappear
when array length decreases, side lobes will disappear
when array length increases, side lobes will appear
In binomial array, when antennas 2 & 3 collide at the centre, they be replaced by a single element carrying _______ current compared to other elements
same
Triple
double
half
Uniform linear array will be fed with current of
equal magnitude and same phase shift
unequal magnitude and same phase shift
equal magnitude and different phase shift
unequal magnitude and different phase shift
In order to draw field pattern, if the directions of HPPD can be calculated using current or voltage, the amplitude will be
half
twice
square root of half
none of the above
