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Questions tagged [reflection-coefficient]

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Filter and Antenna S11 measurement

I have this circuit below where a BLE chip is connected to the filter and then to the antenna, I've been requested to find S11 from the chip output (for the filter and antenna) when I use ENA to find ...
Alan Alan's user avatar
1 vote
0 answers
30 views

How to calculate reflection coefficient of a transmission line with discontinuity [duplicate]

I have a question, let's say that we want to calculate the Reflection Coefficient that we see by watching from left to right of the red-line this circuit: Let's say that: ...
Martino Pistis's user avatar
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1 answer
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Matched junction S parameters

This question was asked in a competitive exam in India. Two-port S matrix is assumed here. For matched junction S parameters, which of the following is correct ? (a) S11 not equal to 0 (b) S11 equal ...
MAJID AHMAD's user avatar
3 votes
4 answers
458 views

How can I deal with the traveling waves associated with lumped impedance? [closed]

The answer I want to get is how to find the reflection coefficient. I wanted to know how to find the reflection coefficient and so this is a different question as the question was written to get that. ...
Field Wave's user avatar
-1 votes
2 answers
187 views

Finding the reflection coefficient for a wave incident from the left into the first transmission line?

I am having a hard time dealing with lumped impedance in problems related to traveling waves. How can I handle problems where both characteristic impedance and lumped impedance are present, as in the ...
Field Wave's user avatar
0 votes
2 answers
167 views

Reflection coefficient of a transmission line with discontinuity

I have a question, let's say that we want to calculate the Reflection Coefficient that we see by watching from left to right of the red-line this circuit: Let's say that: Za= Equivalent Impedence of ...
Martino Pistis's user avatar
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0 answers
53 views

Transmission line max power transfer

I'm studying transmission lines and came up with the question why (voltage) reflection coefficient being zero is not equal to maximum power transfer (conjugate matching). I did some search and found ...
jleng's user avatar
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4 votes
3 answers
351 views

Time domain reflectometer transmission line

I'm quite new to transmission line theory, so I decided to follow an introduction course online. I am struggling with understanding the solution to this question. Here is what the course is giving as ...
DRF's user avatar
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5 votes
3 answers
750 views

Will the reflection from the load end of a transmission line affect the behaviour of an ideal voltage source?

Consider a transmission line with characteristic impedance of Z₀ and electrical length of λ/4. One end of the transmission line is terminated in a load of impedance (lets assume) 2Z₀. The other end is ...
athul.shaji's user avatar
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0 answers
266 views

Output reflection coefficient of a power amplifier

I'm struggling to understand the implication of a poor large signal reflection coefficient at the output of a power amplifier. I designed a power amplifier and checked the large signal S22 (for the ...
Vysakh K's user avatar
3 votes
2 answers
722 views

Can VSWR be complex-valued or is it always real?

This question is related to this one, but about VSWR instead of return loss: Can VSWR be complex since it is based on a complex-valued \$\Gamma\$? If VSWR is complex then it is worth noting that: \$\...
KJ7LNW's user avatar
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What is the difference of meaning between the phase angle of S11 and the phase angle of Γ (Gamma)?

I realized recently that the Touchstone "DB" S-parameter format (.s1p, etc) uses the phase angle of \$\angle \Gamma\$ instead of \$\angle S_{11}\$ and wondered why it didn't use the phase ...
KJ7LNW's user avatar
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1 answer
324 views

Can \$\Gamma\$ remain complex while calculating return loss?

I'm working on adding .s1p touchstone export support to the xnec2c NEC2 antenna simulator for Linux. I would like the S11 dB values in the .s1p to have both real and imaginary values. NEC2 calculates ...
KJ7LNW's user avatar
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1 vote
2 answers
229 views

What are the reasons to use SWR instead of the reflection coefficient?

It seems that using SWR is a tradition (historical legacy). But even in the history of electronics I can't find why SWR was considered more useful compared with the reflection coefficient. What are/...
Arseniy's user avatar
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322 views

Calculate phase of impedance

I've seen this question and thought I understood the basic concepts. When I attempt to solve for phase given \$Z = 60 + j10\$ I end up with 9.46. However, my professor has given the answer as 39.81. I ...
amitchone's user avatar
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1 vote
1 answer
160 views

Protect PCB from RF reflection

I am designing a system on megahertz frequency bands (~ 400-1000MHz.) This device is connected to a variable antenna which does not necessarily stay in match with the circuit so there will be some ...
Anonymous's user avatar
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1 answer
726 views

How to interpret VNA data?

I'm looking at the raw data from a VNA (HP 8720A) and I want to understand how to interpret it, and how to do after-the-fact calibration (ie: read raw data, then apply to it whatever corrections a ...
Alex I's user avatar
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Can reflection take place at the source in transmission lines?

I have read about the reflection of voltage and current, when passed through a transmission line through a load if the load is mismatched with the characteristic impedance. According to my ...
Shanmukh Akunuri's user avatar
1 vote
1 answer
58 views

Opposite of reflection coefficient

The reflection coefficient (in circuits, for example) is generally given the symbol Gamma (\$\Gamma\$). What is the symbol given for the pass or transmission coefficient \$1-\Gamma\$? I've usually ...
nate's user avatar
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