Search found 39 matches

by svenbieg
Sat Aug 05, 2023 8:06 pm
Forum: General Discussion
Topic: Antenna design
Replies: 29
Views: 21293

Re: Antenna design

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 it ...
by svenbieg
Wed Aug 02, 2023 2:31 pm
Forum: General Discussion
Topic: Antenna design
Replies: 29
Views: 21293

Re: Antenna design

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 co...
by svenbieg
Wed Aug 02, 2023 4:40 am
Forum: General Discussion
Topic: Antenna design
Replies: 29
Views: 21293

Re: Antenna design

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.
by svenbieg
Mon Jul 31, 2023 1:44 am
Forum: General Discussion
Topic: Antenna design
Replies: 29
Views: 21293

Re: Antenna design

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 pushed...
by svenbieg
Thu Jul 27, 2023 12:22 pm
Forum: General Discussion
Topic: Antenna design
Replies: 29
Views: 21293

Re: Antenna design

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.
by svenbieg
Wed Jul 26, 2023 8:22 pm
Forum: General Discussion
Topic: Antenna design
Replies: 29
Views: 21293

Re: Antenna design

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 doesn't...
by svenbieg
Sun Jul 23, 2023 4:42 pm
Forum: General Discussion
Topic: Antenna design
Replies: 29
Views: 21293

Re: Antenna design

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 the ri...
by svenbieg
Mon Mar 20, 2023 1:50 am
Forum: General Discussion
Topic: What would you like to see in The Next Chip?
Replies: 443
Views: 930647

Re: What would you like to see in The Next Chip?

A C++ driver-layer.
by svenbieg
Mon Oct 24, 2022 5:36 pm
Forum: General Discussion
Topic: What would you like to see in The Next Chip?
Replies: 443
Views: 930647

Re: What would you like to see in The Next Chip?

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

Best regards,

Sven Bieg
by svenbieg
Sat Aug 20, 2022 5:28 am
Forum: General Discussion
Topic: SPI DMA in ESP32-S2-WROOM
Replies: 8
Views: 15520

Re: SPI DMA in ESP32-S2-WROOM

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 means R...