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Antenna & Wave Propagation Antenna Arrays

If adjacent array elements are separated by lambda/2, the corresponding free-space phase change caused solely by path difference of one element spacing along the array axis is?

A45 degrees
B90 degrees
C180 degrees
D360 degrees

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Correct Answer: C. 180 degrees

Explanation: Phase change beta d=(2pi/lambda)(lambda/2)=pi radians=180 degrees.

Reference: Standard antenna and wave propagation: antenna arrays

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