All Questions
Tagged with input-impedance transmission-line
7 questions
2
votes
1
answer
125
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When should an unmatched antenna be measured with a cable length in even multiples of a half-wavelength?
A few years ago someone told me that if you use a cable which has a length of an even half-wavelength multiple for the frequency being tested, then the impedance measured at the end of that cable will ...
- 2,200
0
votes
1
answer
133
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Lossless quarter wavelength transmission lines
so my lecturer released a past paper with the answers and I have no idea how he got the answer to this question. Please could someone explain it to me? Thanks.
The question is:
A lossless quarter-...
- 15
1
vote
0
answers
52
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Voltage regulation at full load
The voltage regulation is I(Rcosa -Xsina)/Vr
For leading pf
Here %of regulation=(VRcosa-Vxsina)/Vr ×100 %=((4×0.8)-(6×0.6))/100 ×100% =-0.4
Where I am doing wrong?
4
votes
3
answers
3k
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Transmission Line Effects
My question has to do with the rule of thumb we generally use when dealing with transmission lines.
We say that if the length of the line is 10% or less of the wavelength, we could neglect the ...
- 5,784
4
votes
4
answers
19k
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What is the difference between characteristic impedance and input impedance in transmission lines?
What is the difference between characteristic impedance and input impedance in transmission lines? When are these quantities are equal?
- 225
1
vote
1
answer
139
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Input Impedence of Transmission Line Loop
I am practising questions from old tests for an upcoming exam on EM fields and waves. I came across this question which has me confused. I'm not sure where to start.
A lossless TL of length l and ...
- 11
0
votes
1
answer
201
views
what is the Input impedance of transmission line, when source frequency contains two frequency components?
what is the Input impedance of transmission line, when source frequency contains two frequency components?
I know the expression of input impedance of a TL, but it assumes that only a single ...
- 23