Microwave Engineering Questions and Answers – Ferrite Phase Shifters

This set of Microwave Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Ferrite Phase Shifters”.

1. ______ is a device that produces a phase shift of a required amount of the input wave.
a) Phase shifter
b) Attenuator
c) Resonator
d) None of the mentioned
View Answer

Answer: a
Explanation: Ferrite phase shifter is a two port component that provides a variable phase shift by changing the bias field of the ferrite. Microwave diodes and FETs can also be used to implement phase shifters.

2. Phase shifters are used in _______ where the antenna beam can be steered in space by electronically controlled phase shifters.
a) Phased array antennas
b) Dipole array antennas
c) Slot antennas
d) Patch antennas
View Answer

Answer: a
Explanation: Phase shifters are used in phased array antennas where the antenna beam can be steered in space by electronically controlled phase shifters. Phase shifters can be of two types, Reciprocal phase shifters and non reciprocal phase shifters. These are chosen as per the application requirement.

3. Reciprocal phase shifters give different phase shift in different direction.
a) True
b) False
View Answer

Answer: b
Explanation: Reciprocal phase shifters are those devices which give the same phase shift in either direction. That is, either if port 1 or port 2 of the phase shifter is used as input port, the phase shifts at the output remains the same.
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4. If a ferrite slab provides a phase shift of 48⁰/ cm, then the length of the ferrite slab required to produce a phase shift of 180⁰ is:
a) 4 cm
b) 3.75 cm
c) 4.5 cm
d) 3.5 cm
View Answer

Answer: b
Explanation: The given ferrite slab provides a phase shift of the 48⁰/ cm. hence the length of the required ferrite slab is 180/45, the required length is 3.75 cm.

5. If a ferrite slab provides a phase shift of 48⁰/ cm, then the length of the ferrite slab required to produce a phase shift of 90⁰ is:
a) 2.44 cm
b) 1.88 cm
c) 4.5 cm
d) 3.5 cm
View Answer

Answer: b
Explanation: The given ferrite slab provides a phase shift of the 48⁰/ cm. hence the length of the required ferrite slab is 90/45, the required length is 1.88 cm.

6. Gyrator is a device that produces a phase shift of ____ between the input and output.
a) 90⁰
b) 180⁰
c) 45⁰
d) None of the mentioned
View Answer

Answer: b
Explanation: Gyrator is a device that produces a phase shift of 180⁰ between the input and output of the gyrator. This is a special case of the ferrite phase shifter which gives a constant phase shift and cannot be changed.

7. The scattering matrix of a gyrator is:
a) Symmetric
b) Skew symmetric
c) Identity matrix
d) Null matrix
View Answer

Answer: b
Explanation: The scattering matrix of a gyrator is Skew symmetric. This is because of the 180⁰ phase shift that occurs in the device.
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8. Ferrite phase shifters have more advantages over FETs and diodes in using them in microwave integrated circuits.
a) True
b) False
View Answer

Answer: a
Explanation: Even though PIN diode and FET circuits offer a less bulky and more integratable alternative to ferrite components, ferrite phase shifters are cost effective; have high power handling capacity and power requirements.

9. A gyrator can be made a passive device by certain design methods so that they do not affect the power levels of the circuit in which they are used.
a) True
b) False
View Answer

Answer: a
Explanation: The gyrator can be implemented as a phase shifter with a 180⁰ phase shift; bias can be provided with a permanent magnet, making the gyrator a passive device.
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10. If a ferrite slab produces a phase shift of 0.836 rad/ cm, then the length of the slab required to produce a phase shift of 135⁰ is:
a) 2.81 cm
b) 3 cm
c) 2 cm
d) 3.4 cm
View Answer

Answer: a
Explanation: Converting the given phase shift from radian scale to degree scale, the produced phase shift is 48⁰/ cm. To produce a phase shift of 135⁰, the required length is 135/45 this is equal to 2.81 cm.

Sanfoundry Global Education & Learning Series – Microwave Engineering.
To practice all areas of Microwave Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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