Вставка
- Опубліковано 26 січ 2018
- Building upon the lessons in videos #274 and #275, this video describes how to design a 2-element L-Network to create an impedance match to the desired system impedance using series and shunt (parallel) inductors and capacitors. The design process is described, and then actual matching results are measured using a Smith Chart on a VNA. PDF of the show notes:
www.qsl.net/w2aew/youtube/Smit...
Previous Smith Chart videos:
#274: Basics of Smith Chart - Impedance and Admittance:
• #274: Smith Chart Basi...
#275: VSWR and Transmission Line Effects:
• #275: Smith Chart: Z, ... - Наука та технологія
![Gain block RF Amplifiers - Theory and Design [1/2]](/img/n.gif)
I took a Microwave Electronics Technician Class for 9 months at Microwave Training Institute taught by Alan Scott who owned the school in Mt. View, SILICON Valley, California, way back in 1985, and we had PhD's and practicing employed Electrical engineers as was our INSTRUCTORS from companies in the Silicon Valley designing MICROWAVE microstrip amplifiers and learned the use of the Smith Chart, Vector Network Analyzers, antennas, klystrons, magnetrons, etc... etc.. and many other unique subjects about the history and current state of the art of Microwave Engineering. I am now retired and watching this VIDEO made me have great admiration and RESPECT that this SHORT video less than 12 minutes has given be QUICK REFRESHER COURSE of the the applied knowledge and practical computational skills that can be applied in the REAL WORLD of Design. THANK YOU for a WELL THOUGHT OUT Presentation, SIR!, You deserve a MILLION SUBSCRIBERS FOR THIS! ~ Retired Engineering Technician.
There are instructors and there are teachers. You Alan are a gifted teacher, and you make the world a better place. Your ability to convey knowledge and understanding is truly a gift. Please keep it up.
Very gifted man !
I agree.
I just designed an L match network using a Smith chart. Seeing the impedance move to the center seemed like magic. This is such a powerful tool. Your video is excellent. Can't thank you enough.
Ohm my goodness...
I think I am starting to understand Smith charts a lot more, giving me a lot more insight when it comes to impedance matching.
You've rescued my semester with your videos. I am forever grateful to you. Thank you so so much
You're welcome! Please share my videos/channel with your classmates and professors. Do you mind telling me what school you're attending?
Very impressive. I wish I had seen this about 10 years during an antenna design and testing project. I did all you did but much more trial and error. At least I had a VNA and a good supply of passive components. One thing I learned is: RF system design is all about impedance matching!
Thank you a thousand times! The light has clicked on and I finally get it. Now to sit down with my VNA and do some hands-on to really sink the lesson in . . .
Brilliant series on practical applications of the Smith chart. Better than university.
As a Radio Amateur (in more than one sense) this is the first time I've seen such a straightforward and practical explanation of impedance matching using a Smith Chart. No doubt these days there are ways of computing the values of components required but this method is just so satisfying and helps gain an understanding of what is actually involved in the process.
This is EXACTLY what I wanted to know, and now I know it. And in under 11 minutes. That was wonderfully clear. Thank you.
I am amazed. Someone got the whole thing right in less than 20 minutes. Thank you.
Really well and clearly explained. You have a great gift for teaching. Your calm way of talking the student through, works really well for me. Thank-you!
Thank you for putting this series together! You have clarified working with the smith chart, a subject I never really understood completely. It is really helpful to watch you work through an example. You are an Elmer to many...
I study mechanical engineering, so you can imagine I am starting from scratch when it comes to RF circuitry. Yours is the first video out of SOOOOOOOOOOOOOOOOOOOOOOO many that I have watched about impedance matching that actually helped me understand the a practical approach to designing matching networks without getting bogged down with a textbook's worth of electrical engineering terms that a mech such as myself has no schooling in. Thank you so much for your hard work, and looking forward to watching more of your stuff :)
Thank you. I've been looking for this information for days.
Enjoy? Sir, you a rock star! I'm afraid I'll have to watch all you videos ;-). Thank you and good luck.
Thank you!
Hey there, I know this is an older video but your teaching methodology is brilliant. Clear, encouraging, patient, deliberate, etc. You ever thought about writing an RF textbook?
I've thought about it, and have even been asked about writing several times (RF, basic electronics, etc.), but just don't have the time.
Wow, as a german electrical engineering student I enjoy your perfect practical-orientated Videos. Would be great to have a Video about RF-Oscillator design, especially good quality VCOs with low harmonics for QRP projects.
I really enjoy this presentation. I come back and watch it ever so often just to refresh. Such an eloquent job. Thank you so much for all the fine work that you do.
The best instructional video I’ve seen on the Smith chart-thanks!
Wow, that was great. the RF and Smith Charts are new to me and I've had a major problem understanding them. while I won't say things are crystal clear this certainly moved me in that direction. Love your teaching style very much.
I spent a considerable amount of time poring through Caron's Impedance Matching book, but never quite understood it as well as I did after watching this short video. Seeing the initial problem with a complex load impedance, the calculations, the Smith chart plots, and the immediate results on the VNA made all the difference in the world. There is enough information in these videos to work through any matching problem. This Smith Chart series is invaluable. So glad you were willing to devote time to making the videos. I imagine the prep time to create these was very substantial. Thank you once again, Alan.
I"m glad that this series of videos helped to shed some light on the subject for you!
This stuff is captivating to me. The graphical representation makes it so much easier to stay 'pointed in the right direction' when you are solving problems related to this.
Beautifully done! Love the presentation with actual hardware being used for me to get a feel of what's going on. Thumbs up, up , up.
Thank you for a very clear and concise explanation and example.
Great Smithchart video series. I will invariably play through them often
Your capacity in delivering such well-structured and detailed tutorials, covering both the theoretical and experimental aspects is truly amazing. We are really grateful. Would you consider making a video on demonstrating and measuring the characteristic impedance of a transmission line and/or coax cable and its dependence on frequency?
As always Alan very nice presentation. Thanks for doing these tutorials.
Your videos are great to follow! And the touch you give with the practical approach really helps along the way. Nice!
Thanks again for a brilliant video! Using your video on the RF bridge and this I successfully tune my RandomWire antenna. Thanks!
De verdad disfruto aprender con tus vídeos
Haces que temas aparentemente complicados luzcan tal cual son
Muchas gracias y saludos desde México 🇲🇽
I'll probably sound like a parrot, but your videos always keeps me amazed! Deep into RF now, and I'm actually thinking of getting a HAM license thanks to you. I find that I go back to your videos as reference again and again. If you're ever in Sweden, I'll buy you a beer.
Thank you for explaining with such clarity !
Fantastic channel, really enjoy your clear and instructive style of presentations. I do have an electrical engineering exam, but boy I wished my teachers have been as good as you!
Outstanding! I've needed this series for years. Smith Chart sales probably spiked when you released this video :o)
Absolutely great demonstration, Alan.
Very informative and comprehensive video on impedance matching of a network. Thanks a million!
Your videos are a fantastic supplement material for transmission lines courses!
It is indeed magical how wonderful theory works. Thanks Alan
Excelente video como siempre! Gracias.
Outstanding video. All this stuff is very obvious -- once its explained.
GREAT video. Thanks for taking the time to make and share these videos
I've only just found this channel, Alan, and I'm very glad I did. I was looking for some videos to refresh my 40+ EE education on Smith Charts and came across it.
As others have said on here, learning about Smith Charts at university or to pass Ham exams tends to be mainly theoretical, though I did design a couple of fixtures for early ham antennas, but your approach has the benefits of being theoretically sound and very engaging.
I will be looking for others and have subscribed.
I didn't know about L circuit before i watch this video
But now, thanks to ur explanation, i understood
thanks for helping me :)
From south korea
Really great practical explanation of the topic. Wish I had more videos like this when I started grad school. Thanks for sharing the knowledge!
Great series. Thank you for all your hard work.
Awesome videos!!! keep making them. Very clear, concise and to the point!
Great video! Helped me understand these concepts I’m learning in school! Thanks!
The video says a lot about impedance matching. Excellent!
Nice explanation and thanks for the mnemonics!
Thank you for this. Greatly appreciated.
you are wonderful man. you found the truth in this world, you helped many people. may you find the truth in the afterworld, thats the least advice/help i can give to you in return...
you are a magician, you are a magician. you saved me in midterm.
your videos are always helpful. thanks a bunch
Wow! Awesome! I NOW understand Smith Charts a bit better! Thanks.
greetings from Finland. i am very grateful for your teachings. i am a big fan and i hope you will never stop with your videos. 73 de oh8xat.
thank you * 1000. best video out there. this really helps me during my fields and waves class at college
Nice, i can finally understand and user Smith Chart. Thanks you.
I appreciate your good explanation.
Great video! Very informative!!!
Excellent lecture.Thank you so so much.
Alan you outdid yourself yet again, talk to you soon!
Great explanation. You should be an instructor.
Thanks.
AEW's video tutorials keep the knot's off your head. This one helps put the L/C icing on the cake. "Crazy Good" Circa 1939" Wow !
Really helpful videos to understand practical implementation.. Thanks..!!
Excellent tutorial thanks.
Big fan. Keep them coming.
Excellent... he simply does a 'copy paste' to your mind..!
Great video! 👍
Thank you for making this video
Excellent video Alan, always wondered what these charts were called and what they represented
Really well done!
Thank you Sir.Great work.
Nice!
Excellent!
you are a bloody legend
Thank you, I am in your debt!!
That was awesome! I could never find any information on how to build a matching network. Haha now I know why no one knows... It's math!! This was very informative and really something I've searched for many times. Thank you for the time you put into these videos. I'm a fan and new subscriber! 73, ke0eyh
Hi Alan,
Great demonstration. Deserves more than a thumbs up. :-) 73 WB3BJU
This is fabtantsitic given me the confidence to do some expirembtation
Thanks, Alan.
YOU ARE WONDERFUL
Thanks very much. I love this.
I wish you were my teacher. i would have been at some good places designing some crazy stuff by now
This is awesome thanks!
Alan, very nice. I just purchased a NanoVNA. They are only $80.00 at Amazon and look pretty accurate for ham use. Check them out. Every ham can afford a VNA now. Amazing!
very nice video ! Thank you !
Fantastic series of crystal clear Smith chart videos (I’m binge watching). So now all of the power of the transmitter goes into the nicely matched line, but I suppose there is no miracle, it still does not all go to your mismatched load after the L adapter at the end. Is this correct? The extra power not going into the load is then dissipated by the matching network components I suppose? Being returned to ground by the inductor?
power can only be dissipated by resistance (line resistance, antenna/structure resistance, resistance in the tuner components, and radiation resistance). Thus, the bulk of it is indeed going to the radiation resistance (thus being radiated).
incredible video. two things that would be great to elaborate on, you mentioned you CAN do it with two caps or two inductors but you say you dont want to, i dont think you ever mentioned why you wouldn't want to if you could. also, it would be nice to know what specific component and spec for those components would be key to look out for, when searching for inductors i see many notes on the components Q value and q frequency, self resonant frequency and dc resistance, all of which im scratching my head at. incredible video once again helped so much
Thanks for the awesome video! I was wondering will you ever do a video on wide band matching?
Great job Alan! It would be nice to see how to match over a bandwidth rather than a single frequency.
Maybe in future videos. That's one of the downsides of an L-network. The Q of the tuned circuit is pre-determined by the Z0 and load impedance. Other tuned circuit types (PI and T, and others) allow you to adjust for Q (bandwidth) somewhat.
Great information
Love It!!!! Awesome .........
Thank you for your videos. Now that they are widely available, you might consider using one of the nanovnas to complement the paper chart. Ken W8ASA
I might pick one of them up at some point. I do have access to a nice Tektronix TTF506A VNA, so it might be interesting to compare them.
great work
thanks
Very nice. I prefer clockwise/counter-clockwise for adding reactances.
you are a legend!
Wish I could hit like button more than once!
thank you, very interesting
nice and detailed video! wonder what's the cons and pros of LC vs LL in this case?