Quadrature hybrid MCQ’s

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This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Quadrature hybrid”.

1. Branch-line couplers are also popular as Quadrature hybrids.
a) True
b) False

2. The S matrix of a Quadrature hybrid is of size 4×4 and the diagonal elements of a matched coupler are all:
a) 1
b) 0
c) Cannot be determined
d) None of the mentioned

3. Quadrature hybrids are those couplers which are:
a) 3 dB couplers
b) Directional couplers
c) They have a 900 phase difference between signals in through and coupled arms.
d) All of the mentioned

4. A branch-line coupler is an asymmetric coupler.
a) True
b) False

5. 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:
a) 70.7 Ω
b) 35.4 Ω
c) 50 Ω
d) 100 Ω

6. The curve of S14 for a branch-line coupler is similar to that of the S11 curve of the branch-line coupler.
a) True
b) False

7. Branch-line couplers are preferably made using waveguides so as to obtain high gain and simple construction.
a) True
b) False

8. 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) True
b) False

9. 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.
a) True
b) False

10. 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:
a) 70.7 Ω
b) 50 Ω
c) 100 Ω
d) None of the mentioned

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