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How to add an external antenna to an ESP board

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Aug 2019

1 / 55

Aug 2019

Sep 15

tom_l

Aug '19

If you’ve purchased an ESP board without a connector for an external antenna and find you are pushing the limits of reception - all is not lost.

Also this is slightly easier than moving the 0603 sized resistor required to use the external antenna socket on some boards.

These parts can be found for a couple of dollars on ebay or Aliexpress:

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Then do this:

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Good to go:

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ESP32 Development Board with external antenna518

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There are 54 replies with an estimated read time of 6 minutes.

Show top replies

exxamalte

Aug '19

Just wanted to add one more:

I found a TYWE3S module in a Tuya plug and replaced the PCB antenna with an external one. The approach is basically the same as in @tom_l’s original post, but the PCB antenna is mirrored on the TYWE3S.

TYWE3S-external-antenna1500×2110 1.26 MB

I don’t have a before-after comparison. In my case the plug is used behind the pool where there is absolutely no Wifi signal, but with the above modification I could install an external antenna about 1 metre above the pool water level and ESPHome now reports around -72 dB signal strength.

1

27 days later

LavasIlkka Lavas

Sep '19

Thank you! Works well!

2 months later

tom_l

1

Nov '19

Proof of performance boost. Exact same location in my lawn boosted this mi-flora BLE sensor from -90 to -65dBm. It’s not a little antenna though.

IMG_4204s768×1024 139 KB

Also worth pointing out that this is kind of illegal. Now that the device’s effective radiated power has changed the FCC certification is no longer valid.

In this case it’s probably ok as it is a long way from my property boundary and the signal drops off to the noise floor before it gets there.

3

BLE connectivity19

High sensitivity Bluetooth antenna?2

12 months later

JBS

Nov '20

Does anyone have experience with adding an external antenna to a Wemos D1 Mini (non-Pro)?

1 month later

FredTheFrogKeith

Dec '20

Scratch away some of the insulation from the on-board antenna. Connect the signal/core of your coax to this point using solder, and be very short/neat about the connection. Connect the shield/ground of the coax to GND on your board. There ya go!

3 months later

nicktheguitarNick Jones

Apr '21

A nodeMCU wasn’t connecting at all in my shed so I tried attaching an aerial from an old router I had laying around.

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image4032×3024 1.94 MB

Baseline as stock, upstairs.

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With aerial, upstairs.

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With aerial in the shed. Sorted!

image750×970 95.3 KB

1

26 days later

cap60552John Wohlers

May '21

I modded a MagicHome RGB LED strip controller tonight and embedded it inside the metal case of a cheap RGB led floodlight.

Rather than cut the antenna cable, I scraped away the solder mask on the antenna trace, and the ground plane and added a surface mount UFL connector.

MAgicHome - SMD Antenna hack640×1403 135 KB

2 Replies

3

Troon

May '21

Wow. That’s fiddly work.

After I (succesfully, mind you) modded a standard D1 Mini with an antenna flylead, I now use D1 Mini Pros when I need an external antenna, as that already has the socket in place. Still need to move a super-tiny 0603-size zero ohm resistor from one set of pads to another though.

1 Reply

1

laca75tnMy Home

1
cap60552
May '21

Did you measure the signal before and after the mod? What kind of results did you get?

I have been doing more research on this and on the board you have both traces are connected. So, ‘the experts’ are claiming that you need to connect one wire of the external antenna to ground on the board and the other wire of the external antenna to the antenna trace on the board. Do you have any comments about that?

Thanks for your posting

1 Reply

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