Re: Extend range of ESP module
Posted: Sat Jul 15, 2017 12:22 pm
You can't just tack on an additional antenna. The input/output of the module is expecting to see a matched circuit at the operational frequency. If you use a different antenna then the original circuit (antenna) must be removed, and you need to ensure that the new antenna is suitably matched.
If you just tacked on something to the existing board then it is no surprise that you didn't see any improvement. An antenna has resistance, inductance, and capacitance. It is a complex circuit. It may look simple but it is not.
The ESP-07 has an on board antenna and a connector for an external antenna. To use the external antenna you should be removing the connection to the internal antenna. The shorting 0 Ohm resistor next to the connector is what needs to be removed.
If you just tacked on something to the existing board then it is no surprise that you didn't see any improvement. An antenna has resistance, inductance, and capacitance. It is a complex circuit. It may look simple but it is not.
The ESP-07 has an on board antenna and a connector for an external antenna. To use the external antenna you should be removing the connection to the internal antenna. The shorting 0 Ohm resistor next to the connector is what needs to be removed.