Antenna and wave propagation homework problem answer dispute

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Dhruv
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Homework Statement


I have attached the photo of the problem below.

Homework Equations

The Attempt at a Solution


According to me answer should be (a) but book is giving answer as (d).
 
Attachments
  • Photo of a printed multiple-choice question 3.27 on an antenna array of 5 omnidirectional elements with equal in-phase currents, spaced one wavelength apart along the x-axis, with options (a) to (d) about the directivity maximum.
    IMG_0256 (2).JPG
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Discussion

Dhruv said:

Homework Statement


I have attached the photo of the problem below.

Homework Equations

The Attempt at a Solution


According to me answer should be (a) but book is giving answer as (d).

What do they mean by "omnidirectional" here? Like a spherical radiation pattern? Or omnidirectional in the plane that is perpendicular to a dipole antenna?

I also agree that d is a strange answer, but knowing what they mean by omnidirectional may help...
 
L
berkeman said:
What do they mean by "omnidirectional" here? Like a spherical radiation pattern? Or omnidirectional in the plane that is perpendicular to a dipole antenna?

I also agree that d is a strange answer, but knowing what they mean by omnidirectional may help...
Like a spherical radiation pattern.
 
berkeman said:
What do they mean by "omnidirectional" here? Like a spherical radiation pattern? Or omnidirectional in the plane that is perpendicular to a dipole antenna?

I also agree that d is a strange answer, but knowing what they mean by omnidirectional may help...
I should calculate the array factor correct ? And then from there I should calculate angle for maxima ?