ELECTRICAL ENGINEERING DEPARTMENT
EP603 : MICROWAVE DEVICE
Tutorial 2
ANSWER ALL
MICROWAVE FUNDAMENTALS
1.
Explain with an illustration types of propagation mode:
a. Transverse Electromagnetic (TEM)
b. Transverse Electric (TE)
c. Transverse Magnetic(TM)
2.
Relate the propagation of electromagnetic wave in terms of:
a. Poynting vector
b. Boundary condition
c. Spherical and plane wave
3.
Define waveguide.
4.
Draw types of microwave transmission line:
a. Rectangular waveguide
b. Circular waveguide
c. Ridge waveguide
d. Coaxial line
e. Strip line
f. Microstrip
g. Flexible waveguide
5.
Define
a. Critical(cut-off) frequency
b. Critical(cut-off) wavelength
6.
Explain the following terminologies:
a. Group velocity
b. Phase velocity
c. Propagation wavelength in the waveguide
d. Waveguide characteristic impedance
7.
Describe with the aid of a diagram the propagation modes:
a. Mode TE m,n
b. Mode TM m,n
8.
Decsribe waveguide components below:
a. Connectors/Joint
b. Attenuators
c. Coupler
d. Basic accessories (bends, corner, tapered, twist)
e. Junction-T and Hybrid-T
PSIS/JKE/EP603/ENBM
9.
Explain the application of waveguide components:
a. Slotted section
b. Isolator
c. Circulator
d. Mixers
10.
A wave is propagate in a parallel plane waveguide. The frequency and the distance between the 2 walls is
11 GHz and 4 cm respectively. Calculate
(i) cut off wavelength for dominant mode (m=2)
(ii) wavelength in a guide
(iii) the corresponding group and phase velocity
(iv) cut off frequency.
11.
It is necessary to propagate a 15 GHz signal in a waveguide whose wall separation ‘a’ is 2 cm. What is the
greatest no. of half wavelength electric intensity which it will be possible to establish between the 2 walls.
(i.e what is the largest value of m). Calculate (a) guide wavelength for this mode of propagation (b) State its
propagation mode.
Determine
(i)
cut off wavelength
(ii)
wavelength in the guide
(iii)
group velocity
(iv)
phase velocity
(v)
cut off frequency for all the propagation mode.
12.
A rectangular waveguide 6 x 4 cm internally with m = 3 has a 13 GHz signal propagated in it.
Calculate : (i) λp
(ii) λo
(iii) Vg
(iv) Vp
(v) f0
13.
.For
a)
b)
c)
d)
e)
f)
a rectangular waveguide with a width of 3 cm and a desired frequency of operation of 6 GHz (for
dominant mode), determine:
Cut-off frequency
Cut-off wavelength
Group velocity
Phase velocity
Propagation wavelength in the waveguide
Characteristic impedance
14. Repeat question 13 for a rectangular waveguide with width of 7 cm and a desired frequency of operation of
11 GHz
15. For a circular waveguide with a radius of 1 cm and a desired frequency of operation of 10 GHz (for dominant
mode), determine:
a) Cut-off frequency
b) Cut-off wavelength
c) Group velocity
d) Phase velocity
e) Propagation wavelength in the waveguide
f) Characteristic impedance
PSIS/JKE/EP603/ENBM
16. Repeat question 14 for a circular waveguide with a radius of 2.5 cm and a desired frequency of operation of
7 GHz
17. A rectangular waveguide 1.78 x 0.993 cm externally with wall thickness, t - 0.102 cm, TE 10 mode.
Calculate :- (i) cutoff frequency (ii) cutoff wavelength (iii) cutoff frequency for TE21. TE21 mode.
18. Given circular guide, mode - TE11; propagation frequency – 10 GHz, internal diameter – 4 cm.
Calculate :(i) Λ 0 (ii) Λ p (iii) Z 0TE
(iv) Vg
(vi) Vp
19. Given a circular guide with internal diameter; 5 cm.
Calculate f0 for modes : TE 11, TM 01 and TE01. Λ p and characterics wave impedance for the modes stated.
20. Repeat question 19 with circular guide with internal diameter; 13 cm..
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