No. of Pages: 02 VI SEMESTE!l a.
Tech (ECE)
END-SEMESTER E~•·
...:auJN ATION , May 2023 · .
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Course Code- ECECC20/F.. \£.u:. ..,~
<-v course T'tl
1 e- RF and Microwave Eng1nee . 40
Time: 3 Hrs MaXd &Marks.
mentioned in
Attempt all questions. Missing data I infonnation (If any) may be suitably assume -
the answer. Iiwarks I co
Q.
No.
Ql
I Questions
Att~ Pt AnY_ TWO stron Amplifier and 04 co1
I Draw_~e schematic diagram of a rwo_cavity klY
explain. its construction and operation, If Magnetron 1·s
Explain the n-mode of operation of Magnetron. a . fl co1
operating at anode voltage 25kV and current 25A, the magnetic : 04
density is 0.0336T, radius of cathode 5cm, and radius of ano _e
rs
'0 10cm, determine the .cutoff voltage for fixed Bo and cut off magnetic
flux density at fixed Vo . co1
Explain the two valley model theory for negative resistance, what are 04
the three criteria must be satisfied by the band strUcture of a I
C
semiconductor to exhibit negative resistance?
Attempt Any TWO 04 CO2
Q2
Derive the scattering matrix for Directional coupler. 04 CO2
® A 40mW microwave signal is fed· to arm3 of E plane T by a matched
generator. Arm 1 and 2 are terminated respectively, in 40ohm and 60
b ohm loads and the wave impedance of the guide is SOohm. Find the
04 CO2
power delivered to the loads.
Write Short note on
Q Magic T
<o <iil Circulator
Gi}. Isolator
Reentrant Cavity
Q3 I iv. Attempt Any TWO Otl · I CC"~
' k l,Design a sU'gie-section quarter-wa'C matching transfonncr t o match
1
a 25 ohm Joad to a 100 ohm line at Jo = 3 GHz. Determine the percent
bandwidth for which the SWR s; 1.5 . 04 C03
Design a three-section binomial transformer to match a 100 ohm load
I~ to a 200 ohm line and calculate thi bandwidth forf m= 0.05.
04 C03
(s) Design a three-section Chebyshev transformer to match a 200 ohm
load to a 100 ohm line with rm= 0.0 5 .
Q4 . Atte mpt Any TWO C04
04
..
(1)Describe. the filter d esignmg
· · using . image
. parameter method .
a
(11) Describe the conce P t t o d es1gn
. stepped impedance low pass filter.
Prove the kuroda's indentity (n 2 = 1 +1f2!Z1) as shown in Fig.1 04 C04
. ---- Z1
b !! ,,2
,, 1
Fig.1
Design a band-pass filte_r having a 0.5 dB ripple response, with N=3. 04 C04
The center frequency 1s 1GHz, the bandwidth is 10%, and the
impedance is 75 ohm.
Q5 Attempt..A.ny TWO
Explain the measurement of Coupling factor, insertion loss, and 04 cos
a directivity, isolation of microwave components.
How the frequency measurement is done by direct frequency 04 cos
meter(DFM), and also explain with the slotted line section. Explain
the reason why the marking gap (as shown in Fig. 2) in DFM is
decreasing as the frequency increases. i
Fig. 2
Explain the procedure with suitable diagram. for the measurement of 04 cos
@) an unkown impedance.
Given
0.5 tlB Ripple
N Kl K2 g3 g4 g5 K6 g7 gs g9 K10 Ku
I 0.6986 1.0000
2 1.4029 0.7071 1.9841
3 1.5963 1.0967 1.5963 1.0000
4 1.6703 1.1926 2.3661 0.84)9 1.9841
5 1.7058 1.2296 2.5408 1.2296 1.7058 1.0000
6 1.7254 1.2479 2.6064 J.3 I 37 2.4758 0.8696 1.9841 \
2.6381 1.3444 2.6381 1.2583 1.7372 1.0000
7 1.7372 1.2583
2.6564 1.3590 2.6964 1.3389 2.5093 0.8796 l.9841
8 1.7451 1.2647
2.6678 1.3673 2.7239 1.3673 2.6678 l.2690 l.7504 1.0000
9 1.7504 1.2690
2.6754 1.3725 2.7392 1.3806 2.7231 1.1485 2.5239 0.8842 1.9841
10 1.7543 1.2721
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