Hi,
In the ESP32-Pico-D4 datasheet, the reference schematic shows a matching network after antenna.
But the values are all TBD.
I notice that on the many development boards made by Microwavemont the LNA_IN pin is directly connected to the PCB antenna.
Currently I have some "W3008C" https://www.digikey.com/product-detail/ ... ND/2543332 ceramic antenna (50ohm impedance). Can I also omit the matching network?
Thanks
Baoshi
Antenna matching network on ESP32-PICO-D4
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Re: Antenna matching network on ESP32-PICO-D4
Antenna matching is very dependant on your specific board and board design, hence the TBD values.
(edit: i realise this paragraph relates to the normal esp32 chip and not the pico-d4)
A 50ohm antenna is not a perfect match for what the ESP32 outputs, i belive is it something like 30+ j??.
However it is a relatively close match and to a 50ohm antenna would only experience about 0.6dB of insertion loss from the antenna mis-match.
If you want the best range possible, you would need to manually tune the antenna using either a spectrum analyser or a vector network analyser to ensure a perfect antenna match.
(edit: i realise this paragraph relates to the normal esp32 chip and not the pico-d4)
A 50ohm antenna is not a perfect match for what the ESP32 outputs, i belive is it something like 30+ j??.
However it is a relatively close match and to a 50ohm antenna would only experience about 0.6dB of insertion loss from the antenna mis-match.
If you want the best range possible, you would need to manually tune the antenna using either a spectrum analyser or a vector network analyser to ensure a perfect antenna match.
Last edited by Lucas.Hutchinson on Wed Oct 18, 2017 9:19 pm, edited 1 time in total.
Re: Antenna matching network on ESP32-PICO-D4
So it should be 50ohm matched already. Additional external matching or filtering elements may or may not be needed depending on antenna and layout. Sometimes you will see a 0ohm resistor used and the caps unpopulated but they are designed in to give the option for tuning.ESP32-PICO-D4 integrates all peripheral components seamlessly, including a crystal oscillator, flash, filter capacitors and RF matching links in one single package.
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