Electronics and Communication Engineering - Microwave Communication - Discussion
Discussion Forum : Microwave Communication - Section 4 (Q.No. 16)
16.
A 75 ohm line is first short terminated and minima locations are noted. Then the short is replaced by resistive load and minima location are again noted. If minima location are not altered and VSWR is 3, the value of resistive load is
Answer: Option
Explanation:
rv 
and VSWR 
.
Discussion:
2 comments Page 1 of 1.
Jayson said:
7 years ago
Here, it should be; vswr=vmax/vmin or zl/zo.
Nikunj said:
9 months ago
Voltage standing wave ratio: It is the ratio of maximum voltage to minimum voltage.
If the voltage minima occur at load ZL < Z0 then,
If the voltage maxima occur at load ZL > Z0 then,
Analysis:
Z0 = 75 Ω.
When the load is shorted the voltage minima occur at the load, and it does not change even when the short is replaced by RL:
and RL < Z0
VSWR = 3,
RL = 25 Ω.
If the voltage minima occur at load ZL < Z0 then,
If the voltage maxima occur at load ZL > Z0 then,
Analysis:
Z0 = 75 Ω.
When the load is shorted the voltage minima occur at the load, and it does not change even when the short is replaced by RL:
and RL < Z0
VSWR = 3,
RL = 25 Ω.
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