Question 1

Total resultant field obtained by the antenna array is given by which of following?

Accepted Answer

A) vector superposition of individual field from the element 
B) maximum field from individual sources in the array 
C) minimum field from individual sources in the array 
D) field from the individual source

Question 2

The free electron concentration in N-type GaAs is controlled by:

Accepted Answer

A) effective doping 
B) bias voltage 
C) drive current 
D) none of the mentioned

Question 3

What is the progressive phase shift of the end-fire array?

Accepted Answer

A) 0 
B) 90 
C) 180 
D) 60

Question 4

GaAs is used in the fabrication of GUNN diodes because:

Accepted Answer

A) gaas is cost effective 
B) it less temperature sensitive 
C) it has low conduction band electrons 
D) less forbidden energy gap

Exam 4: Antenna Arrays, Power Amplifiers, and Gunn Diodes

Total resultant field obtained by the antenna array is given by which of following?

The free electron concentration in N-type GaAs is controlled by:

What is the progressive phase shift of the end-fire array?

GaAs is used in the fabrication of GUNN diodes because: