How Does Antenna Spacing Affect Signal Intensity at a Distance?

In summary, the question asks for the distance d to be adjusted in order to maximize the intensity of radiation received at position B. This can be achieved by adjusting the phase of each antenna, which can result in constructive interference at position B. Therefore, the distance d should be adjusted such that the path length from each antenna to B is equal, leading to constructive interference and maximum intensity at B.
  • #1
nahanksh
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Homework Statement


The four antennas are arranged in a square with side length d and each of the antennas has an adjustable phase of the radiation emitted. The intensity of radiation emitted by each antenna is I1 with wavelength λ. A receiver is placed at locations A (at the center of the antenna array), B (much farther from the array than d, due east), and C (much farther from the array than d, due south-east). http://online.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?courses/phys214/oldexams/exam1/sp08/fig5.gif

How should the distance d be adjusted so that the maximum possible intensity is received at position B? (Assume φ1 = φ2 = φ3 = φ4 and remember that B is far away.)

Homework Equations




The Attempt at a Solution



I am not even getting close to the question..

Could anyone give me a hint or help approach to this question..?
 
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  • #2
Think constructive and destructive interference.
 

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