RF and Microwave PCB Design - Part 5: Couplers
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- Опубликовано: 6 авг 2024
- In this RF and Microwave PCB Design Series episode, Ben Jordan walks through the essential design steps for microstrip couplers most commonly found on microwave PCBs: The 90-degree Hybrid, the Rat-Race, and the Backward (directional) coupler.
References:
Microwaves 101 pages on Branchline Couplers: www.microwaves101.com/encyclo...
Microwaves 101 pages on Coupled Line Couplers: www.microwaves101.com/encyclo...
Previous episode, “Part 4 - Power Dividers”: • RF and Microwave PCB D...
Chapters:
00:00 Introduction to Hybrid Couplers.
08:16 Port 4 Isolation - how that works.
11:45 Applications of the 90-degree Hybrid.
16:28 Extending for broader bandwidth.
21:08 The Rat Race coupler.
28:18 Directional Coupler (Coupled-Line Coupler) Introduction
30:19 Coupling principles - Odd and Even mode impedance.
33:15 Directional Coupler Geometric Structure.
36:07 Directional Coupler Applications.
38:08 Example design walk-through at -6dB coupling.
50:30 Practical Limits of Coupler Dimensions on FR-4
51:24 Second example design at -12dB coupling.
59:19 Frequency Response of the Examples.
You can calculate impedance and dimensions using various free tools, or use the Layer Stack Manager in Altium Designer:
- QUCS (qucs.sf.net)
- AppCAD (www.broadcom.com/appcad)
- Saturn PCB Toolkit (saturnpcb.com/pcb_toolkit/)
Learn more at my.altium.com/learning/gettin...
Design PCBs with a Free Trial of Altium Designer Here: www.altium.com/yt/altium-acad...
Download CircuitMaker Here: www.altium.com/circuitmaker/d...
The Altium Academy is an online experience created to bring modern education to PCB Designers and Engineers all across the world. Here you can access a vast library of free training and educational content covering everything from basic design to advanced principles and step-by-step walkthroughs. Join industry legends as they share their career knowledge, review real-life design projects, or learn how to leverage one of Altium's leading design tools. No matter your level of experience, the Altium Academy can help you become a better Designer and Engineer!
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Very nice, love the practical design examples. Brings light to some of the black magic of RF.
very nice and straight forward lecture I would recommend for any designer even with beginner level
from theory to practical this people what need
keep going :)
Thanks a lot for the lectures Altium!
Most welcome!
Splendid really
Hi Ben!!Thank you so much for the lectures!! Could you make a video explaining the power handling of microstrip structure? How can I design looking for normal specs (frequency, bandwidth,etc) and also power handling?. Thank you a lot!!! Regards from Lima, Peru!
Thank you very much for your lectures, details, straight, easy to understand. Could you make one video tutorial for the Power handling topic? Please help. Thank you gain.
Why doesn't the same cancelling-out effect that occurs on P4 also occur on P2. In both cases, there are 2 paths from P1, one with λ/4 and one with 3λ/4. Is it because the direct route without 90° turns has significantly less energy loss from the cazse with 4 turns? Love the videos!
Note that the lambda/4 lines of the quadrature hybrid have different line impedances. The lines between 1-2 and 3-4 have Z0/sqrt(2) impedance while the lines between 1-4 and 2-3 have Z0 impedance. Thus, P2 and P4 don't look the same seen from P1.
The maths are explained in this video: ruclips.net/video/royPv01p_cI/видео.html&ab_channel=EMPossible
Could you do some videos on lange couplers for balanced load modulated power amplifiers
I have the same question as Anantha Dhruva. I.e., why are you NOT adding the contribution of the 3/4 lambda path (P1 to P4 to P3 to P2) to port 2? - Thanks! - Jim
One very big question, the input from port 1, has 2 options to come to port 4 and it gets isolated because of a 180 degree phase cancellation, the same happens at port 2, there is another path that will give a 180 degree shift that is through the port4 end towards the port3 end and to the port2, that must make port 2 also isolated!, am I thinking correctly, so can someone clarify me on that!??
Yes. I wonder that too.
I think at a time 48:43 there is a typo. W should not be 1.96mm but 0.96mm.
nice video bro
When is episode 6 coming ?
What is the whiteboard setup used in this video?
What is the digital notepad you are using to teach us , that's connected to PC. I'm looking for something like that
Thanks, I really appreciated it. Can you please tell me where I can get this blackboard? and the name of it.
you mean the waccom?
How much directivity did you get?
Hi Sir, I want to join two rf signal in to one.. can you help me with it
HI... DO U KNOW ABOUT UNIT CALLED ' COMBINATOR ' PROBBLY FOR 50 OHM I GESS!! THE FREQUNCY BAND IS THE SECOND MATTER! PUT THESE 2 IN GOOGLE
4:04