I found this in my Bluetooth-headset today, the antenna has about 2 lambda.

https://github.com/svenbieg/Clusters/assets/12587394/3c702482-1602-404d-a51e-bf449bd18227

The effective antenna seems to be very short, it is the missing line between the feet on the left. Maybe this is by design because ...

Yes, i mean my last post. In the document of Texas Instruments You have posted, they say their goal was to reach -10dB, so 90% of the energy would be delivered to the antenna.
What makes my result interesting is the resonance in the far field, the signal-strength is 100% higher. This is where the ...

How can You be sure, without giving it a try?
My design has a 100% better result in OpenEMS.
Me 'amateur' could easily turn my home into a laboratory to figure out the performance.
To me it looks like the 'inverted F antenna'-people have found it out without my formula.

The calculation is really simple with my graphical solution:

When transmitting we push electrons into the antenna. These electrons are pushing the neighbours, a wave moves through the antenna at the speed of light. This wave gets reflected at the end of the antenna, because electrons can't be ...

I give up at this point. The people at Texas Instruments already have proofed their calculation in reality, i'm not able to do so.

Maybe i'll post a photo of my smartphone when it is broken, and if i can find the WiFi-antenna.

I've had time and played around a bit. I changed nothing, i just increased the cupper-cells to 256. This calculation took about 3 times longer. Your design now looks like an illusion to me:

https://github.com/svenbieg/Clusters/assets/12587394/65f8efc4-b8fc-4632-a2e6-dead7ad910d9

Your antenna ...

Thank's a lot! I gave it a try, and the result of my antenna looks much the same as Your current design:

https://github.com/svenbieg/Clusters/assets/12587394/542a2e8f-db8a-4584-8190-7fa21662173c

The S11-graph on the left has a positive share, looks like the negative half sinus.
Both graphs on ...

A C++ driver-layer.

I'd like the same pin-layout very much, because i don't like to sell adapters to my customers.

Best regards,

Sven Bieg

Do you have sources for 1. Espressif states there is a 'dma chip' in the memory model, and 2. there's no need for a 'dma chip' in a RISC architecture?


1. I couldn't find a dma-controller in the hardware-diagram. The flash-chip itself would have to access memory directly to have DMA.

2. RISC ...