Quadrature hybrids are those couplers which are:

1.	Quadrature hybrids are those couplers which are:
A.	3 dB couplers
B.	Directional couplers
C.	They have a 90<sup>0</sup> phase difference between signals in through and coupled arms.
D.	All of the mentioned
Answer» E.

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If the branch-line impedance of a coupler designed to operate at 1 GHz is 70.70 Ω, then the characteristic impedance of the material of the arms of the branch-line coupler is:
S12 and S13 curves for branch-line couplers are almost a straight line parallel to X –axis. Both the curves are similar and follow same path.
The curve of S14 for a branch-line coupler is similar to that of the S11 curve of the branch-line coupler.
A 50 Ω branch-line Quadrature hybrid has to be designed to operate over a range of frequencies. The branch-line impedance of this coupler so designed is:
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The curve of S14 for a branch-line coupler is similar to that of the S11 curve of the branch-line coupler?
The plot S11 v/s frequency for a branch-line coupler has a straight line characteristic for a wide range of frequency around the designed frequency range.
A 50 ‚âà√≠¬¨¬© branch-line Quadrature hybrid has to be designed to operate over a range of frequencies. The branch-line impedance of this coupler so designed is:$

Quadrature hybrids are those couplers which are:

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