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Compact Rectennas for Ultra-Low-Power Wireless Transmission Applications

Abstract : This paper addresses the design and characterization of compact rectennas for wireless power transmission application in the industrial, scientific, and medical 868-MHz/915-MHz band. These rectennas are designed for supplying power to a dc-to-dc boost converter. The proposed low-profile rectenna exhibits a good tradeoff between compactness (0.06λ² at 900 MHz) and RF-to-dc conversion efficiency, which is higher than 25% for RF power densities of at least 0.25 μW/cm² and 37% for 2.1 μW/cm². It is shown that this rectenna can activate the standard Bq25504 dc-to-dc boost converter for an RF power density higher than 0.6 μW/cm². Moreover, through using a storage capacitor of 220 μF, a light emitting diode (LED) can be turned on for a duration of 60 ms with power consumption of 9.45 mW and a dc voltage of 3 V. The LED allows emulating the dc consumption of the QN908x ultra-lower-power Bluetooth 5 module which operates in the transmission mode with -4 dBm of output power.
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https://hal.laas.fr/hal-02083185
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Submitted on : Thursday, March 28, 2019 - 6:04:11 PM
Last modification on : Friday, January 10, 2020 - 9:10:13 PM

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Abderrahim Okba, Alexandru Takacs, Hervé Aubert. Compact Rectennas for Ultra-Low-Power Wireless Transmission Applications. IEEE Transactions on Microwave Theory and Techniques, Institute of Electrical and Electronics Engineers, 2019, 67 (5), pp.1697-1707. ⟨10.1109/TMTT.2019.2902552⟩. ⟨hal-02083185⟩

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