Please check this below topic. Seems similar to your case. https://www.esp32.com/viewtopic.php?f=12&t=41564 If we assume your antenna has a 50 ohm impedance, then your matching network can be wrong. I think the transmission line isn't exactly 50 ohms. It should be very thick for a 2-layer board. Nev...

So, you are planning to use the I2C bus over a cable. There is a possibility that clock line effects the data line. When you drive the clock line to ground strongly, it causes glitches on the data line via capacitive coupling while data is at high level through the pull up resistor. You may want to ...

Generally, if you don't have a specific purpose, you can connect both analog and digital grounds to the same ground plane. The noise is coupled through a common impedance. The purpose here is to reduce the impedance and so the noise. Impedance is mainly resistive for low frequency and mainly inducti...

Previous location of C35 was better. You are matching the chip to the transmission line. C35 and L6 should be between these two. Chip -> C36, L6 and C35 together -> transmission line -> antenna. But you don't need to update the PCB. You can just replace the matching components to check the wifi issue.

I used Saturn PCB toolkit and calculated coplanar waveguide impedance. I've found 57.2 ohms with your width of 0.294mm and spacing of 0.2mm for JLC04161H-7628 (er 4.4) process. The other calculation you made says differential pair so it is not correct. I recommend you to use 15 mil track width and 8...

I believe ESP32-S3-FN8 has an RF impedance of 35+j0. W3008 antenna has 50 ohms. When I place the conjugate (35-j0) to a smith chart software (i.e. SimNEC) and try to match to 50 ohms, it calculates a series 1.5nH inductor and a parallel 0.9pF capacitor (closer to the antenna). Additionally, 0 ohms r...

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PCB layers and antenna simulation.

Hello All, I want to share a recent project of mine with you. This is a design based on ESP32 chip. It is compatible with open source esp-at project. One can easily develop a custom firmware on it as well. Schematics, layout, PCB antenna design and simulations, pin out diagram, part list and much mo...