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Hans Rosenberg
Netherlands
เข้าร่วมเมื่อ 16 ก.ค. 2024
RF PCB DESIGN: Cheap 20dB coupler you can design and build at home.
RF PCB DESIGN: Cheap 20dB coupler you can design and build at home.
Check out my Electronic Product Development Course
www.hans-rosenberg.com/courses
Get my free Electronics Product Development Checklist
www.hans-rosenberg.com/checklist
Other parts in this series:
th-cam.com/play/PLsWHPs7La-3JXgrFtanSCWEKTd7cE8T_l.html
In this video, I'll show you how to design and build a 20dB coupler using the cheapest available board material. A coupler is an incredibly useful building block in RF electronics. I’ll explain the basic theory behind it and demonstrate how to design and simulate such a circuit. Additionally, I’ll guide you through creating the RF PCB layout and share the measurement results using a NanoVNA. The results are impressive, especially considering that I’m using standard FR4 material and a very simple design process which does not require expensive EM simulators like HFSS or Microwave Studio.
Website: www.hans-rosenberg.com
0:00 intro
0:18 What is an RF coupler?
1:54 Practical use example: RF power amplifier
2:36 Coupler RF parameters
4:10 What does an RF directional coupler look like?
4:51 How to design one: Calculations
6:59 The PCB material used in this video
7:26 RF Coupled microstrip lines in QUCS
8:34 RF simulation in QUCS
9:11 RF measurements setup with NanoVNA Network Analyzer
9:48 RF measurement results
11:10 Simulation VS measurement summary
11:36 Goodbye, see you next time
Check out my Electronic Product Development Course
www.hans-rosenberg.com/courses
Get my free Electronics Product Development Checklist
www.hans-rosenberg.com/checklist
Other parts in this series:
th-cam.com/play/PLsWHPs7La-3JXgrFtanSCWEKTd7cE8T_l.html
In this video, I'll show you how to design and build a 20dB coupler using the cheapest available board material. A coupler is an incredibly useful building block in RF electronics. I’ll explain the basic theory behind it and demonstrate how to design and simulate such a circuit. Additionally, I’ll guide you through creating the RF PCB layout and share the measurement results using a NanoVNA. The results are impressive, especially considering that I’m using standard FR4 material and a very simple design process which does not require expensive EM simulators like HFSS or Microwave Studio.
Website: www.hans-rosenberg.com
0:00 intro
0:18 What is an RF coupler?
1:54 Practical use example: RF power amplifier
2:36 Coupler RF parameters
4:10 What does an RF directional coupler look like?
4:51 How to design one: Calculations
6:59 The PCB material used in this video
7:26 RF Coupled microstrip lines in QUCS
8:34 RF simulation in QUCS
9:11 RF measurements setup with NanoVNA Network Analyzer
9:48 RF measurement results
11:10 Simulation VS measurement summary
11:36 Goodbye, see you next time
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One interesting parameter to check would be return loss with different coupling capacitors. I wonder what you are actually seeing on 1GHz, the lower gain might be caused by worsening RL.
hello sir , is it possible do one video on power amplifier ?
Send me the checklist
Thanks for this great video, please send me the checklist :)
you're welcome, link is in the description. Best regards, Hans
Please send me the checklist!
Link is in the description. Best regards, Hans
I am curious why you didn't use an LDO on the PCB. I would expect a good deal of noise added to the signal when powering from any switching supply, let alone a bench power supply. I don't know of an inexpensive way to measure noise figure (other than luck on eBay), but I wonder if your gain and compression measurements might even change if you repeated them using a lithium battery? Actually, if you have a variable attenuator, you could do a noise comparison (not measurement) by sticking this on a GPS receiver. See how high you can dial the attenuator before the receiver stops acquiring a cold fix. Then repeat, but using a battery as the power source.
I have a very good linear bench supply :-) I'm not sure what the transfer or supply noise to amplifier noise is. The bias resistor does take care of some isolation but some will definitely get through. If you want to supply it from an unspecified supply it would be great to add a low noise ldo. Do you know the LT3045?? That is an amazing device!
I saw you on Robert Feranec's Channel. Incredible good Tutorials and easy to understand for me. Thank you so much! Also please send me the checklist. :-)
Thanks a lot! Link is in the description. Also making a professional course at the moment (not free). Best regards, Hans Rosenberg
Hi! Send me the checklist! I have one, but would love to see yours
Link is in the description. Curious to know what you think about it. Best regards, Hans
Nice theory, but I mostly use HF bands. 2 metre at the highest. At 2m, the tracks would need to twist like snakes to fit on a board.
indeed, 'lf' is not acceptable here, maybe you can do the same with a transformer at these frequencies?
You need a proper vna.
I know, care to donate one ;-) I really would love to have a fieldfox all in one....... a bit expensive unfortunately ;-)
@@HansRosenberg74 The Librevna is ok for many things. The developer is very helpful. There is an ecal for it too, the librecal. The whole setup is reasonably priced, at least when compared to some online electronics courses ;-) There is potential to improve the isolation on the Librevna (although it is ok for many things already), and being open-source, you would be free to do this.
This is so very useful for me. Thanks for posting this Hans. DE N5BOC.
You are welcome!
Hi Hans, I tried to send you an email to your address but it return undeliverable. Did you change address ?
Hi, I did not change it. It is info@hans-rosenberg.com. I had a problem a month ago, my mailbox was full. I configured my mailserver with very low storage space. I just tried to send myself an email and that was ok. I'll try to send an email with attachment, maybe it is full again? I set it to 'unlimited' but maybe it runs into the limit of my subscription?
Just tried it with 5Mb in attachments... no problem. I don't know what is wrong.....
Great video!!
Thanks!!!!
Greetings Mr Hans! I'm wondering if you are reviewing the PCBs of your subscribers? If so I would gladly send you my very second PCB in the hope to give me some advice. And i wanted to note that your videos can't get any better. Thanks for your work!
Unfortunately, I don't have the time for that. You could try the reddit printedcircuitboard thread: r/PrintedCircuitBoard . That thread is specifically for that goal and they have good experts there.
@HansRosenber Totally understandable. Anyways, thanks for the quick response. 😄👍
thanks thanks hans another interesting video ❤
You're welcome :-)
Hello, I am an IT student interested in programming, electronics and all it's aspects. I am sure you hear this often, but this 15-minute video taught me more than any lecture/lesson from a teacher at my high school. I would like to express my gratitude for sharing your knowledge. Since you've linked the checklist in the description, I thought I'd at least leave a comment for the youtube algorithm and to thank you.
Thanks, the reason for making these videos is exactly what you state: You don't learn this stuff in school. Actually, I hardly learned electonics design at school, even though I did an electronics program. It's not very good. I learned most of it because I'm hooked on electronics since I was 8 years old :-)
When calculating S21 and S43, did you also account for the extra losses from the SMA connectors on the PCB? How much are those losses in your setup?
I did not account for those. It could very well be that those extra pieces of pcb track from the coupled lines towards the connectors and the connectors themselves account for the 0.1dB of loss I'm missing.
@@HansRosenberg74 Thank you for the reply! I would be interested to learn more about your footprint. I've struggled to get losses of less than 0.5 dB in a connector when using edge-mounted coaxial connectors. The transition from the connector to a 50-ohm trace is tricky to get just right.
If you want good performance, you have to use specialized connectors and ro4003. Here is an example of such a connector: www.belfuse.com/resources/assemblyinstructions/cinchconnectivitysolutions/johnson/ai-ccs-john-sma-high-frequency-end-launch-connectors-pc-mounting-instructions.pdf
This is not the best document, 10 years ago I worked on a radar system that needed very high specs, I used end launch connectors that were specified up to 26GHz. The layout was exactly outlined in the datasheet that came with the connector, including which type of rogers material to use and the thickness of the dielectric off course. I couldn't find it that easily, but a bit more searching should allow you to find it. These connectors are more expensive though. I think they may go up to 20usd.
Thank you for the tutorial sir✌, can you make a tutorial on how to design wideband coupler?
Thanks, yeah, that would be interesting. I did study the theory for how to do that so it should not be that hard, however, getting a very high directivity at the same time (which I would really like to have) might be pretty challenging. Not much information present on how to do that. I think for a wideband design I'll also need better pcb material like ptfe or rogers.
quick english lesson... it is not coopled... it is cupled. it means to join.. like a couple of people... not a coople of people
it's a Netherland thing. And it's nothing compared to e.g. the way some Germans pronounce "kay-coo-late" instead of "calculate"
Haha, thanks, you're not the first one to mention it, I had no idea :-)
Hans your English is well enough that I didn’t not realize you were not a native speaker on the first 2 or 3 videos I watched.
Thank you.
You're welcome!
Send me the check list please
Link is in the description! Best regards, Hans
Send me the checklist
Link is in the description! Best regards, Hans
Nice "coopler" tutorial. Thanks Hans 😁
Good old Dutch version... but, honestly, the English here is on the transmitted side of the coupler, only about 0.05 dB out the accented port 😺🇨🇦
:-D
I'm getting the feeling I pronounced something wrong..... on more than 1 occasion :-) As long as you guys get it, my engineering mind concludes that the main task of getting information transmitted from A to B was successful and there is no real problem :-D
@@HansRosenberg74Your english is infinitely better than my Dutch and perfectly understandable, compared to, say, some people from the north of the UK ;-). For DC to 10's to possibly the low 100's of MHz a similar device can be built with opamps. Ian Hickman provided the details in his "Analog Circuits Cookbook"
I checked the geometry with the (free online) Sierra Circuits Impedance Calculator which claims to be a 2D Field solver. The numbers are very close. Without solder mask: C=0.0979, Zodd=45.21, Zeven=55.03 S11 to S14: -42.836 ∠ 110.64, -0.287 ∠ -89.07, -20.371 ∠ 1.04, -24.244 ∠ -179.7 With solder mask (parameters guessed): C=0.1000, Zodd=44.46, Zeven=54.34 S11 to S14: -34.881 ∠ 157.36, -0.291 ∠ -90.37, -20.191 ∠ 0.25, -24.58 ∠ -179.64
Nice!
Awesome.
Thanks!
Sadly QUCS development is in such a sorry state. So much potential.
Fortunately there is a well developing fork: Qucs-S
Oh, cool, did not know about that!
what is improved in that version?
@@HansRosenberg74 it adds support for spice based simulation
Thank you Mr Rosenberg
You're welcome! :-)
Send me the checklist please! And thank you
You're welcome. Link is in the description. Best regards, Hans
How is input and output stability accounted for in this design?
That was really hard, those devices are unconditionally stable ;-) I think you may be able to get them to 'yell at you' if you annoy them enough, but you'd really have to do your best to achieve that.
Could you send me the checklist Mr Rosenberg?
Hi, yes, link is in the description. I'm also working on a professional course, this is not free and will be ready in 3 months hopefully. Link to that is in the document. Best regards, Hans.
Hi, I'm a software developer getting into electronics and it's a ton of fun. I'm trying to build a 8 bit computer using sinple IC's for gates and transistors but i start getting strange "mistakes" in the logic and someone informed me that it might be that I need capacitors as I'm using too much power too quickly on certain parts. Can you make a video on nice rules of thumb to keep things powered? Maybe how to segment the sections in a way that keeps it simple. The wiring becomes a lot so any simplicity I gain is a win!
Hi there, sounds like you're breadboarding? This is a real pain for getting good 'signal integrity'. For that you need a ground plane and good decoupling. If you're on a breadboard, use a star shaped supply (supply all ic's from one point) and make sure you have a 100nF cap very close to each ic to keep the supply of that single ic quiet. Best way would be to design a board, but that is not flexible off course.
Send me the checklist
Link is in the description, best regards, Hans
You should say you have to sign up to your community to get your "free" checklist. It might be a fantastic checklist. I don't know. The video was good. Don't like clickbait links which promise something, but then add another step. Can't trust them.
sorry about that. The reason I gather emails is that I need a way to pay for these youtube videos. I intent to do that by selling courses. These courses are not free. In order to reach potential customers I need email adresses. Just to get an idea, I 'burn' 3000 euros a month doing this because of regular costs, so I need to generate some income from this in the future. Very scary, since setting something up like this (with a course) takes around a year. The checklist is really good, I've been sending it out for a few months now and the nicest responses I got were from other very experienced engineers who really liked it. The course I'm making is based on this document, but goes a lot further. It is going to take me 5 months to make I think. I can imagine your hesitation to leave your mail address. I also hate spam. You can always unsubscribe, your mail address will disappear from the platform I use and I don't think I can get that back. Hope this clarifies things a bit. Best regards, Hans
Send me the checklist
Link is in the description. Best regards, Hans
Thanks Hans. I got it
Please send me the checklist. Thanks
Link is in the description. Best regards, Hans
Send me the check list
Link is in the description. Best regards, Hans Rosenberg
Hi, Hans. Really like yours videos. Im working in development field of rf boards (up to 16GHz). So i would really like to take a look at your checklist. Thanks.
Thanks a lot. Link is in the description. Best regards, Hans Rosenberg
kindly Send me the check list
Link is in the description. Best regards, Hans Rosenberg
Send me the checklist
Link is in the description. Best regards, Hans
Hi Hans I have been working with UHF / SHF ( SATELLITE COMMS ) for many years, But this really brings it all together, some of the problems I came across while working with these Frequencies. Please send me the Checklist Thankyou for a great video
Great to hear! Link is in the description. I'm also making a course (not free) loosely based on this document. That course will contain way more details, also going into EMC, ESC etc etc. www.hans-rosenberg.com/product_development_course . Best regards, Hans
I don't know if you saw the other videos in this playlist. If you haven't, you'll learn a lot more from those as they are also covering fundamentals of RF.
Please send me the checklist, Hans. So much appreciated.
Link is in the description. I'm also making a course (not free) loosely based on this document. That course will contain way more details, also going into EMC, ESC etc etc. www.hans-rosenberg.com/product_development_course . Best regards, Hans