To couple a coaxial line to a parallel wire line, it is best to use a:...

To couple a coaxial line to a parallel wire line, it is best to use a: 

(1) A slotted line (2) Balun (3) Directional coupler (4) Quarter wave line transformer
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Answer :

To couple a coaxial line to a parallel wire line, it is best to use a: Balun.

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