Alright everyone this contest is over and we have a winner! The answer is for this specific problem is: the length of T line 1 is 0.0292*lambda, the impedance of the quarter wavelength line is 35 Ohms. There is actually a universal answer that I'll outline in an upcoming video when we announce the winner. Hint: it's always an 1/8th wavelength line!
@exapod23
Жыл бұрын
I got Smith's charts flashbacks from my uni exams. Help
@Zachariah-Peterson
Жыл бұрын
Since I gave the desired impedance of the transmission line connected to the load, you shouldn't need a Smith chart. FYI, I detest Smith charts....
@dankodnevic3222
Жыл бұрын
Hi Zach, I got 0.0291 lambda :-) Also, it can be solved with single TL of Zo=33.94 (rounded 34) with single length=0.31227 lambda (0.312) 12% longer, but wider BW and less reflection...
@Zachariah-Peterson
Жыл бұрын
Correct! You can also watch the derivation of answers here: kzitem.info/news/bejne/xquCp3iupJx4bG0
@cevdettosun1170
4 ай бұрын
Sir thank you so much for teaching quarter wave transfor. from Turkiye. Best
@AltiumAcademy
Жыл бұрын
Contest is officially closed! We'll announce the answer and winners very shortly!
@Rainbient
Жыл бұрын
My favorite subject. T-lines!
@JKTCGMV13
Жыл бұрын
Well presented
@seanjosef5014
Жыл бұрын
Hey Zach, love your videos! I have a question for you to make a video about it. I've been told by engineers to pour power planes under all the components that references to that plane potential. Meaning, they want the plane to exceed the vias related to the components and surround all of them because of parasitic capacitance that the plane have on the interconnects of that circuit. Can you please make a video explaining about the parasitic capacitance of power planes? thanks!
@eduardshaid1718
Жыл бұрын
My cat (and he always watches Zach with interest) tell me: 35 Om length/4, after 50 Om length/34.
@kirans862
Жыл бұрын
Hi Sir I like the way to present these topics related to RF and I am waiting to learn more. Below are the values I got for the question - L1 = 0.143lambda and Zo2 =28.5043.
@arezuabdi9218
Жыл бұрын
The length=pi/4 (45 degree), the characteristic impedance (Zo2= 50 ohm)
@arezuabdi9218
Жыл бұрын
Or lambda/8 for the length
@masonwilliams7688
Жыл бұрын
Hello Zach, here's my result to your challenge. I found that l1 = 0.029*lambda and Z02 = 35 Ohm. I normalized the load impedance to 0.5 - j*0.14 then used a Smith chart to find that the input impedance becomes purely real with a T-line length of about 0.029*lambda. This normalized input impedance was approximately 0.49, denormalized to 24.5 Ohm. Using Zin = Z0^2 / ZL for a quarter-wave impedance transformer, I obtained Z0 = 35 Ohm. Let me know what you think!
@eduardshaid1718
Жыл бұрын
My cat thinks the same, but you made a terrible mistake referring to the Smith chart. Zach doesn't like the Smith chart so my cat is terrified right now...
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