Inverted-F Antenna Design Walkthrough - Part One
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- Опубліковано 4 сер 2024
- Tech Consultant Zach Peterson responds to some recent questions he's received on videos relating to RF Design and Patch Antennas. He explores Inverted-F Antennas from both a routing and design perspective.
0:00 Intro
0:34 Understanding the Routing
3:14 Inverted-F Antenna Design Process
6:33 Tuning
8:39 Circuit Mode & Input Impedance
13:24 Inverted-F Vs. Patch Antennas
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👉 Inverted-F Antenna Design For a PCB: resources.altium.com/p/invert...
👉 Do All Antennas Need a Ground Plane?: resources.altium.com/p/do-all...
👉 Microstrip Patch Antenna Calculator for RF Designers: resources.altium.com/p/micros...
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Is there no NEC antenna simulation out there which can help designing the inverted F antenna?
Great
Very interesting! This is a lot smaller compared to the patch antenna. But how do you ensure the antennas do not create EMI issues for the components on the PCB? If the antenna is on the same side as the components, can the EM waves generated from the antenna couple back into the components on the PCB?
There are a few simple things that can be done. First, if you designed the stackup correctly, you will probably have used a 4 layer board with thinner laminate on the outer layer (maybe 5 mil thickness). The other components should all be placed over ground on the outer layers, so make L2 and L3 ground. This will help minimize parasitic capacitance/inductance of those circuits. The other thing you will typically see is a set of grounded via fence along the edge of the board leading to the antenna. The typical guideline is that the via fence should be sized such that the maximum spacing is about 1/8 wavelength of the wave being radiated from the antenna. Finally, if the antenna radiation is so strong that these methods do not work, an external module might be needed, but this is only for very high power systems.
@@Zachariah-Peterson I appreciate the time you take in making your videos and teaching us all everything that you do. Is there a way for us to add a trace antenna onto our pcb board while designing it in altium. I see a lot about patch and chip antennas but I want to just add my own trace onto the pcb board. Sorry if my wording is off, this is all new to me and just trying to learn the best that I can. I appreciate your response. Thank you!!!
@@coreycastro3013 You can do it by drawing the custom antenna using fills in the component footprint, or you route traces to do this. If you route traces you might create a net antenna rule violation, so you will need to suppress that rule on your RF net if you are going to draw out the antenna with traces.
Zach has been spot on. A few other pointers: via stitching on either side of feed line should be 1/20th wavelength apart. Run connections between components on inner layers unless short distance. Use ground fills on all layers if possible. Fill entire board with 1/8 wavelength via stitching. I have used this method for +20dbm transmit with no problems. Antenna tuning place pi or tee matching network in feed line as close to antenna as possible but still in ground plane area (not ground keepout). Antenna tuning is another beast requiring VNA and some more experience understanding how to properly use VNA. I generally use chip antennas for wearables but have used some inverted F for larger boards.
I am pretty new to this antenna design
may i know how antennae ends are connected to PCB ? Is it by soldering or some spring contacts or any other alternate methods available for this?
If you are referring to the antenna image in the thumbnail, it is probably like a press-fit type of mounting with some solder to reinforce the connection. In the example in the video, the antenna will be etched directly on the PCB just like a copper trace, it is not an external component that is then attached in an assembly process.