WorksheetsUnderstanding Antennas
Total questions: 10
Worksheet time: 5mins
What are the main types of antennas used in communication?
Coaxial, Fiber, Optical
Directional, Isotropic, Reflector
Yagi, Helical, Fractal
Dipole, Monopole, Loop, Patch, Parabolic
Describe the different radiation patterns of antennas.
Static, dynamic, and fluctuating patterns
Unidirectional, circular, and linear patterns
The different radiation patterns of antennas include omnidirectional, directional, bidirectional, isotropic, and sectoral.
Reflective, absorptive, and transmissive patterns
What is the difference between antenna gain and directivity?
Antenna gain includes efficiency and losses, while directivity only measures the focus of the radiation pattern.
Directivity measures the total power radiated by the antenna.
Antenna gain and directivity are the same concept.
Antenna gain is only concerned with the physical size of the antenna.
List some common applications of antennas in modern technology.
Electric vehicle charging stations
Common applications of antennas include mobile phones, Wi-Fi networks, satellite communications, GPS systems, and television broadcasting.
Home appliances like microwaves
Radio frequency identification (RFID) tags
How does the design of an antenna affect its performance?
The design of an antenna directly impacts its gain, directivity, bandwidth, and radiation pattern, affecting overall performance.
The performance of an antenna is solely determined by its location.
Antenna design only influences its physical appearance.
The design of an antenna has no effect on its performance.
What is the directivity of half-wave dipole?
1.44
1.43
1.5
1.64
Which of the following expression is correct for radiation efficiency?
ηr=Rl/Rr+Rl
ηr=Rr/Rr+Rl
ηr=Rr/Rr−Rl
ηr=Rr/Rl
Radiation resistance of a half-wave dipole is ______
73Ω
72Ω
71Ω
70Ω
The graphical representation of the radiation properties of the antenna as a function of space coordinates is called.
Radiation pattern
Radiation Intensity
Directivity
Resolution
Advantages of Micro-strip Patch antennas are
Linear and circular polarization
Small size and weight
Ease of installation and fabrication
All the above
