Antenna Quiz

In a non-isotropic directional antenna, which radiating lobe axis makes an angle of 180° w.r.t. major beam of an antenna?

• Minor lobe

• Side lobe

• Back lobe

• None of the above

Sterdian is a measurement unit of

• Point angle

• Linear angle

• Plane angle

• Solid angle

If an antenna draws 12 A current and radiates 4 kW, then what will be its radiation resistance?

• 22.22 ohm

• 27.77 ohm

• 33.33 ohm

• 39.77 ohm

In broadside array, all the elements in the array should have similar excitation along with similar amplitude excitation for maximum radiation.

• Phase

• Frequency

• Current

• Voltage

Which of the following statement is true for bandwidth of an antenna?

• Inversely proportional to 1 / Q ²

• Directly proportional to Q ²

• Directly proportional to Q

• Inversely proportional to Q

The ratio of radiation intensity in a given direction from antenna to the radiation intensity over all directions is called as ________

• Directivity
  
  

• Radiation power density
  
  

• Gain of antenna
  
  

• Array Factor

Which of the following is false regarding Antenna array?

• Directivity increases
  
  

• Directivity decreases
  
  

• Beam width decreases
  
  

• Gain increases

A uniform linear array contains _____________

• N elements placed at equidistance and fed currents of equal magnitude and progressive phase shift
  
  

• N elements at non-equidistance and fed currents of equal magnitude and progressive phase shift
  
  

• N elements at equidistance and fed currents of unequal magnitude and progressive phase shift

• N elements at equidistance and fed currents of unequal magnitude and equal phase shift
  
  

If the progressive shift in antenna array is equal to zero then it is called _________

• Broad side
  
  

• End-fire
  
  

• Yagi-uda
  
  

• Fishbone antenna
  
  

Pattern multiplication is the multiplication of single array radiation pattern with ___

• Array Factor
  
  

• Beamwidth
  
  

• Total Field
  
  

• Directivity