Qinteq’s RF energy harvesting technology provides high efficiency solutions for wireless powering of energy autonomous sensors


What is the maximum working distance?

The maximum working distance for power transmission depends on the power level emitted, the Tx and Rx antennas being used, the electrical consumption of the sensor and the communications mode (continuous or pulsed). By using the AST-01 family sensor tags the typical working distance in continuous mode is 2 to 5 meters and in pulsed mode, up to 100 meters.

How much power is available at the sensor level?

Available power at the sensor side is typically in the low milliwatt and microwatt range. It depends on transmission distance, antenna performance, embedded capacitor size and sensor operating voltage.

Which types of sensors can be connected?

A tag model offers two analogue interfaces with a voltage range of 0 to 10 Volts, one digital SPI interface and 1 digital I2C interface. There are also tag models with integrated sensors (temperature, pressure, humidity, acceleration, light and magnetic field) or those designed for specific sensors (potentiometer, strain gauges, incremental encoder, proximity sensor…).

Which frequencies are supported?

The power transmitter PWT-04 emits a continuous wave in the ISM band, at a frequency of 2.45 GHz. The power harvesting tags are designed for a frequency range of 2.4 to 2.5 GHz. The bidirectional communications module operates at a frequency of 868MHz.

Can I harvest energy from Wi-Fi?

Ambient energy from Wi-Fi routers etc. is typically not strong enough to power QINTEQ’s tags at a useful distance. The use of a dedicated power source, such as the PWT-04 transmitter, is required.

Can I use other energy sources?

QINTEQ’s tags can be powered by any RF (microwave) source, emitting sufficient power in the 2.4 to 2.5 GHz spectrum. QINTEQ, however, recommends AST tags to be used with the PWT-04 transmitters, to ensure reliable performance.

Which antennas can be used?

PWT-04 transmitters and AST tags are designed to work with standard 50 Ohm antennas. Antennas need to be matched to the frequency range being used.

Can the products be configured?

The PWT-04 transmitter’s embedded software can be used to adjust the output power across the range of 1 to 4W. The AST tags can be configured remotely, including sensor output voltages, continuous or pulsed mode. AST tags can also be configured, by QINTEQ, to your specific needs for multiple digital sensors using SPI and I2C protocols.

Can I use QINTEQ technology in any country?

QINTEQ products are currently certified for Europe.

Is there interference with other devices?

Any device generating radiofrequency signals can interfere with other such devices. The interference potential depends on field strength, frequency band and the ability of the receiver to discriminate noise. QINTEQ has performed empirical testing with mobile phones and Wi-Fi devices using Direct Sequence Spread Spectrum (DSSS) and found no degradation in device performance at practical distances. Interference within the Wi-Fi band is further reduced by automatic channel picking of Wi-Fi devices and the use of directional antennas.

Is the technology proprietary?

QINTEQ technology is protected by international patents. Please contact us for any licensing needs.

Is the technology safe?

QINTEQ technology uses radio frequency transmissions, already used by household appliances such as mobile phones, alarms, Wi-Fi routers etc. Exposure levels to radiation from a QINTEQ transmitter are significantly lower than from a handheld cell phone. All QINTEQ products are CE marked and approved for use in Europe.

Which regulatory standards do apply?

All QINTEQ products are CE marked and compatible with following International and European standards: CISPR11, EN301489, EN60950, EN62311, EN62479, EN300220.