ESP32-C3 SuperMini antenna modification

6 hours ago

ESP32-C3 SuperMini modules have a compact SMD antenna that limits WiFi range, but adding a 31mm silver-plated wire as a quarter-wavelength antenna significantly improves performance.
The modification involves soldering a wire with a 16mm horizontal loop and 15mm vertical section directly to the SMD antenna terminals, bypassing the original antenna.
Testing showed consistent signal strength improvements of 6 dB on average, and over 10 dB at range edges, leading to more stable connections and extended WiFi range.
The original SMD antenna is inefficient due to poor PCB placement near components, causing RF energy reflection and reduced range.
The new wire antenna achieves better omnidirectional radiation by using unshielded horizontal and vertical elements, minimizing null points.
The modification works for both WiFi and Bluetooth, and is effective on various ESP32-C3 SuperMini board designs.

The project tested the maximum range of 2.4 GHz Wi-Fi under ideal conditions, aiming to control a robot via Wi-Fi commands.
Wireless communication power is measured in watts and dBm; antenna gain in dBi; EIRP is transmitter power plus antenna gain.
In Canada and the US, the maximum allowed transmitter output for 2.4 GHz Wi-Fi is 1W (30dBm) with a max EIRP of 4W (36dBi) without a license.

The Uputronics GPS/RTC Raspberry Pi Expansion Board is a timing receiver featuring an u-blox M8 GNSS chip, priced at £41.99.
It provides access to raw GNSS messages and correlator data, enabling sub-nanosecond precision for orbit determination and Doppler measurements.
The board does not include an antenna but works with both high-end and cheap antennas, though better reception comes with a nicer one.

QuadRF is a phased-array radio built with Raspberry Pi 5 and an FPGA, capable of advanced signal processing and beamforming.
It can detect WiFi through walls and track drones, with open-source potential hinting at more advanced government capabilities.
QuadRF includes software for RF streaming/decoding, useful for WiFi analysis, and connects via a browser-based VNC interface.

12Urenloop is an annual 12-hour relay race held at Sint-Pieters square in Ghent, with teams using batons for lap counting.
Zeus WPI evolved from manual to automatic lap counting, first via Bluetooth modules in batons (2011), then a modernized stack (2019-2022).
UltraWideBand (UWB) technology enables centimeter-level localization by measuring signal travel time, similar to GPS but on a smaller scale.

Dragon Labs CR-8 is an 8-channel coherent SDR with 12-bit ADC, tuning 25–1750 MHz, and 8 MHz bandwidth per channel.
Coherent design supports radio direction finding, beamforming, and antenna diversity.
Originally created for a Master's thesis by SDR++ author Alexandre Rouma.

The project tested the maximum range of 2.4 GHz Wi-Fi under ideal conditions, aiming to control a robot via Wi-Fi commands.
Wireless communication power is measured in watts and dBm; antenna gain in dBi; EIRP is transmitter power plus antenna gain.
In Canada and the US, the maximum allowed transmitter output for 2.4 GHz Wi-Fi is 1W (30dBm) with a max EIRP of 4W (36dBi) without a license.

The Uputronics GPS/RTC Raspberry Pi Expansion Board is a timing receiver featuring an u-blox M8 GNSS chip, priced at £41.99.
It provides access to raw GNSS messages and correlator data, enabling sub-nanosecond precision for orbit determination and Doppler measurements.
The board does not include an antenna but works with both high-end and cheap antennas, though better reception comes with a nicer one.

QuadRF is a phased-array radio built with Raspberry Pi 5 and an FPGA, capable of advanced signal processing and beamforming.
It can detect WiFi through walls and track drones, with open-source potential hinting at more advanced government capabilities.
QuadRF includes software for RF streaming/decoding, useful for WiFi analysis, and connects via a browser-based VNC interface.

12Urenloop is an annual 12-hour relay race held at Sint-Pieters square in Ghent, with teams using batons for lap counting.
Zeus WPI evolved from manual to automatic lap counting, first via Bluetooth modules in batons (2011), then a modernized stack (2019-2022).
UltraWideBand (UWB) technology enables centimeter-level localization by measuring signal travel time, similar to GPS but on a smaller scale.

Dragon Labs CR-8 is an 8-channel coherent SDR with 12-bit ADC, tuning 25–1750 MHz, and 8 MHz bandwidth per channel.
Coherent design supports radio direction finding, beamforming, and antenna diversity.
Originally created for a Master's thesis by SDR++ author Alexandre Rouma.

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