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WorksheetsAntenna shortcourse
Total questions: 15
Worksheet time: 8mins
The following are several types of wire antennas except
Horn
Dipole
Loop
Monopole
An antenna with dimensions of 0.25λ, working at a frequency of 3GHz, what are the dimensions of the antenna?
A. 2.5 cm
A. 25 cm
A. 10 cm
A. 100 cm
Choose one of the advantages of wireless communication compared to wired communication…
At a very long distances, wireless communication has less free space loss than cable loss
Wireless communication is free from Doppler effect on moving users
Communication Cables experience multipath resulting in signal degradation
Multipath in wireless communication protects signals from intersymbol interference (ISI) compared to wired communication which only uses one path.
The radiation pattern of a good antenna is measured in the region ...
Farfield
Middle Field
Reactive Near Field
Radiative Near Field
The following are some of the things that affect the efficiency of an antenna except
Power of the antenna
Material of the antenna
Dielectric component of antenna
Antenna impedance
The effective aperture will reach its optimum value if the antenna…
In the matching impedance condition
Has losses due to conductive components
Has losses due to dielectric component
Antenna efficiency reach 200%
If a conductor element without feed is near the antenna, what are the possibilities?
The conductor component undergoes scattering aperture principle
An impedance matching is required due to the antenna input impedance has changed
A resonant short circuit that change the antenna radiation pattern will occur
All answer are true
An antenna with an impedance of 50 Ohms, how much is the VSWR value if connected to a 50 Ohms transmission line?
1.46
0
1
unlimited
The following things happen to electromagnetic waves while inside the propagation channel:
Reflection
All answer are true
Diffraction
Scattering
The following is the purpose of doing an array on an antenna except...
Improve antenna gain
Improve antenna matching impedance
Better directed radiation pattern
Improve the received power on the receiver side
The frequency range that is limited by a certain SWR value is the definition of an antenna parameter called:
Beam width
Beam Area
Bandwidth
Directivity
Antennas that have radiation properties or reception of electromagnetic waves greater in certain directions are:
isotropic antenna
directional antenna
omnidirectional antenna
array antenna
The type of impedance that only appears when there is a conductor near the antenna...
Mutual Impedance
Intrinsic Impedance
Self-Impedance
Conductor Impedance
The following are techniques for matching the antenna to the transmission line, except:
Balun
T-match
Mutual match
Quarter Wavelength transformer
If a transmission line connected to an antenna has an impedance of 50 Ohms, then in order for impedance matching to occur, the antenna as a load must have an impedance of...
0 ohm
10 ohm
20 ohm
50 ohm
