This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Rectangular Waveguide Cavity Resonators”.

1. There is no energy stored inside a rectangular waveguide cavity resonator.

a) True

b) False

2. A rectangular cavity supports:

a) TEM mode of resonance

b) TM mode of resonance

c) TE mode of resonance

d) TE, TM modes of resonance

3. Microwave resonators can be constructed from open sections of waveguide.

a) True

b) False

4. A waveguide is open circuited at both the ends to use it as a waveguide resonator.

a) True

b) False

5. Given the dimension of the waveguide as b<a<d, no resonant mode exists for this specification of dimensions.

a) True

b) False

6. Find the wave number of a rectangular cavity resonator filled with a dielectric of 2.25 and designed to operate at a frequency of 5 GHz.

a) 157.08

b) 145.2

c) 345.1

d) 415.08

7. In order to obtain the resonant frequency of a rectangular waveguide, the closed cavity has to satisfy:

a) Gaussian equation

b) Helmholtz equation

c) Ampere’s law

d) None of the mentioned

8. Unloaded Q of a rectangular waveguide cavity resonator:

a) Does not exist

b) Defined as the ratio of length of the waveguide to breadth of the waveguide

c) Defined as the ratio of stored energy to the power dissipated in the walls

d) None of the mentioned

9. The required length of the cavity resonator for l=1 mode (m=1, n=0) given that the wave number of the cavity resonator is 157.01 and the broader dimension of the waveguide is 4.755 cm:

a) 1.10 cm

b) 2.20 cm

c) 2.8 cm

d) 1.8 cm

10. If the loss tangent of a rectangular waveguide is 0.0004, then Q due to dielectric loss is:

a) 1250

b) 2450

c) 2500

d) 1800