ECE3300 Lecture 13b-8 Impedance Matching stub match parallel

[@HanaShoib]

I've graduated and everything now but when I was studying, I used to watch your videos and they helped me learn SO much. So thank you : ) Inspired me to share knowledge myself. I used to send these to my friends as well xD

[@ninodroid2382]

This video popped up after a year for my graduation, made me smile and remember the days where I watched your videos to learn about electromagnetics. I really appreciate your videos they helped me a lot. Suliman from Palestine ❤️

[@cfurse]

If you are using the chart for Z, the short is on the left. If you are using it as Y, the short is on the right.

[@xristoforivanov2452]

Thank you for the video is help me a lot and I was 15 % of the best students making 15/20 points on Smith Chart .... thanks again !!

[@MrPanthershah]

thanks a lot.. this tutorial is a saviour for me on a night before exam..

[@jebinvthomas5555]

bad luck dude ispe not even one que. asked??????????

[@amd8969]

Thank you so much for your explanation , today I had a microwave lab final exam , and the same idea came in the exam , It was piece of cake ! :)

[@MagicGirlsOnly]

Than you so much for these videos. You explain everything very concisely. CSUN

[@cfurse]

Depends on where you start in the design. IF you start at the front of the stub, you rotate towards the load to either the short or open at the end of the stub. That is counterclockwise. IF you start at the open or short at the end of the stub, you rotate towards the generator, and that is clockwise.

[@turkutatar]

Thats why L should be equal to 0.344-0.25

[@gyrofrequency]

Thanks for the verification about the coax tee being a parallel stub. Have lots more to say about variable stub tuning but am limited by posting space limitations.

[@MrPsverma]

maám , u're a god gifted person . doing such a helpful job so nicely n smoothly!!(n more importantly saving our asses b4 exam lol)

[@rohitkankal2131]

+Paritosh Sahay *god gifted

[@rohitkankal2131]

+Rohit Kankal any video related to double and triple stub???

[@MrPsverma]

+Rohit Kankal this 1 should be helpful , not a video but nice enough xplaination www.amanogawa.com/archive/docs/J-tutorial.pdf

[@louieluis8840]

Would that computation be working on an actual antenna making?

[@Evan-rx6cj]

So what was happening there at the end?... The video ended abruptly.

[@rickysambora8321]

if you asked to design... what? i need this part. where I can find the next videos? 13b-9 seems not the 2nd part

[@cfurse]

@gyrofrequency Yes. You cannot really create a series stub on coax.

[@DeSilva_S]

great explanation. can you please do a video on double stub match as well.

[@19JP87]

Could someone please clarify for me, (from about 1:53) why is YL rotated to the r=1 circle and not the g=1 circle? I thought that because we converted to the admittance chart we'd have to match to the conductance as opposed to the resistance. Perhaps I'm just a little confused. If anyone can help explain it to me, it would be greatly appreciated.

[@kinshukmajee8083]

when using smith charts in case of admittances the r circles becomes the g circle, and x circles become the b circles. only difference is that the real and imaginary axis of the reflection coefficient becomes inverted, i.e the positive real axis becomes towards left side, and positive imaginary axis is downwards! hope it helps... :)

[@krnjc830]

the video cuts off. where's the rest?

[@gyrofrequency]

I assume that, if the transmission line is coax, using a coax tee connector to insert the stub would make it a parallel stub and not a series stub?

[@gyrofrequency]

Also, if the stub is terminated into a variable capacitor, could this create a variable stub matching section that could actually vary the effective inductive or capacitive reactance depending upon the range of normalized -jX that the capacitor would create at a give frequency? Could this create a remotely tunable variable stub to tune out reactance if the lreactance of the load changed?

[@DG1TAL]

1:46 "So here I am, rotating towards the generator ..." - Right, those late nights in the lab. :)

[@dibbstarno]

its cool but just to ask wen dealing with the stud is always to move from Yin towards towards the Y short cct in clockwise direction as seen in most books

[@gcwalinate]

i think you mean a compass

[@younglovenkolonzi9946]

When you converting the load ZL to The admittance YL since you said it's easy that way, why didn't you convert the short circuit stub to an open circuit stub.?

[@Chris_Grossman]

Good video but it was a bit annoying that it was cut short at the end.

[@umair136]

shouldn't the admittance of stub be taken from the load towards generator, as we are actually interested in finding out the total admittance at point A??? please enlighten!!

[@hanspeter2210]

when are you allowed to turn in impedance or admittance chart? because the angle you rotate to cross the circle is different, if you point-mirror before turning.

[@gyrofrequency]

Is there a way to correspond via email to circumvent the posting limitations? Would like your opinion on the viability of variable stub matching. If not, thanks.

[@sivaramaditya4610]

why did u hit the 1+jX circle of the impedance chart..i think it should be the 1+jX circle of the admittance chart

[@soukainamourssi7164]

do you have a tutorial video about double stub matching?

[@usmanimtiaz4550]

Thank you! Very helpful video. You gave the Fish.

[@luckathisgrace9868]

I have a question about how to find the length of the short circuited stub at point X whose admittance is given as 0.02+ 0.04j. Could anybody help me. I can upload the full question here. I really need the answer. Appreciate all of your help.

[@danielleon4051]

Hi Dr Furse, do you have a tutorial video about double stub matching? please let me know and thanks for this one.

[@eya_ounissi]

Thank you for the explanation 😊

[@cirûelapebble]

you're the best!

[@parthmehta8410]

Correct me if i am wrong..but i think the diagram has a small error..for a short circuit parallel stub, the stub needs to be shorted ( closed)...seems that no one has noted

[@SAMoeraiVAES]

Parth Mehta yeah i just noticed it too

[@gregoriocasas3259]

In the video she says that SC stand for short circuit

[@mandinh18]

idk wtf watching but I watched the whole thing

[@shredape]

you should put a Low Pass FIlter on your voice. The T's and S's are really sharp

[@thealexvsc]

Very useful, thanks!

[@VarunKumar-cg6es]

i need explanation about double stub matching network with smith chart

[@dcl07081990]

Super helpful!

[@RafaThomaz]

Thank you for the video.

[@TCGboi28]

THE SHORT CIRCUIT IS ON THE RIGHT OF THE SMITH CHART!!!

[@ahmedakifhekimoglu]

ASMR lectures :)

[@xMrJanuaryx]

Parallel stub match otherwise known as a shunt for anyone who was confused like me!

[@dannyze85]

thank you very much!

[@graffchanel60]

where is end of the video pls, i have exam tomorrow

[@Upgradezz]

Very nice

[@mateusenriconi2706]

If you are asked to design a parallel short circuited stub... ? There is a gap in your lectures

[@awabshamia5715]

thank you very much ..

[@tamyboy1]

thankyou

[@wardharriman8965]

There is some great Smith chart software which runs on your desktop. Check out www.ae6ty.com/Smith_Charts.html or www.youtube/user/ae6ty or check out W0QE's youtube channel

[@johncenakiwi]

Use a pop filter with your mic. The audio is full of "pops".

[@MCSGproject]

christ

[@bryanboudjang4735]

kiss baby

[@Electromag50]

The Smith Chart is a thing of beauty and simplicity, why does this Proff make it so ugly difficult and cumbersome? I use smith charts everyday with 30 years experience in the RF industry, 1 you will never use the smith chart to calculate the magnitude of anything, 2 you will need to know the smith chart like a road map. You never need to know exactly where you are as that is the job of you simulator or your smith chart program. But in the lab, you will need to know what elements to use to travel any transformation. After your initial design from the office, In the lab you will have test equipment or an analyzer to guide your magnitude of everything. Never calculate on a smith chart no more than you will calculate with a slide rule vs a calculator. 90% of the industry will deal with bandwidth where in this woman class you will need to calculate every frequency point, so great in 10 years you might have something. Here is what you need to know, shunts and series C and L, Transmission lines. Q circles are taught wrong, so do put too much into them... know that every thing travels clock wise with frequency going forward. Every play with google map where you drop the little man on the map? Learn to do that on the smith chart, walk back wards keeping your eyes on the transformed source impedance. If you decide to turn around to see where you are going, you are looking at the load and it will be Zs* (*conjugate), If you can do this, you will be light years ahead of the others. Speaking of Loads, know SWR circles. Dont say Generator, as that is the source. Conjugate to the source is the load.