Method to reduce distance-sensitivity within an operating range in HF-RFID WPT links

Synthesis between the printed spiral coil and the planar interdigital capacitor for near-field wireless energy transfer (WET) is proposed. The proposed amalgamated design is intentionally positioned under several displacements, namely, planar offsets at the z-axis as well as lateral offsets at both the x-and y-axes to investigate tolerance capability. This is particularly crucial in practical circumstances, whereby a perfect alignment between primary and secondary resonators is not usually achieved unless with the integration of magnet plates to aid seamless position latching, otherwise complex adaptive matching circuits are needed to compensate for displacements. At a fixed axial transfer distance of 25 mm, the corresponding maximum simulated and measured transfer efficiency is 73.01% and 71.84%, respectively, under perfect alignment. Sustainable power transfer efficiency (PTE) is demonstrated during a 360 • planar clockwise rotation with the step size of 45 • and the measured variation ratio is 0.02 while the feasibility of preserving PTE until 0.6 quotients of lateral displacement and axial distance is validated when up to 15-mm lateral offsets occur either from x or y reference planes. It can thus be concluded that the printed spiral resonator proposed appears to be a good candidate to rectify planar and lateral displacements featuring simplicity and space-saving robust structure that necessitates only a minimized footprint, thus paving the way for adaptation in WET applications, such as consumer electronics and implanted medical devices.

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“…15 illustrates the combined PTE peak under planar displacement. In order to gauge the link performance, variation ratio, VR is computed as [51]…”

Section: Resultsmentioning

confidence: 99%

Printed Spiral Resonator for Displacement-Tolerant Near-Field Wireless Energy Transfer

et al. 2019

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“…Table 5 summarizes displacement-tolerant performance of proposed design. Variation ratio, VR is used to assess the extent of PTE sustainability and computed as [32]:…”

Section: B Experimental Resultsmentioning

confidence: 99%

Displacement-Tolerant Printed Spiral Resonator With Capacitive Compensated-Plates for Non-Radiative Wireless Energy Transfer

Pon¹,

Rahim²,

Leow³

et al. 2019

IEEE Access

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A printed spiral resonator without external lumped elements is proposed. Instead of employing surface-mount device capacitors, the series-parallel capacitive plates are designed and etched on the same substrate to achieve simultaneous conjugate matching between a pair of symmetrical near-field coupled resonators. Simulations are conducted with the aid of CST Microwave Studio. The proposed design displayed satisfactory tolerance toward planar displacement at z-axis plane, lateral displacement at x-and y-axis planes, as well as concurrent planar and lateral displacement. Positioned at perfect alignment with a transfer distance of 15 mm, the simulated and measured maximum power transfer efficiency achieved are 79.54% and 74.96%, respectively. The variation ratio for planar displacement acquired is 0.29% when receiving resonator is rotated from −180 • till 180 • with a step size of 15 •. Under rotational angle from 0 • till 180 • , the measured average variation ratio for lateral displacement at x-and y-axis up to 15 mm is 20.14%. The feasibility of sustaining power transfer efficiency under various offsets depicts the possibility of integrating the proposed simple design for low power wireless energy transfer applications, such as wireless charging for handheld devices in consumer electronics and implanted biomedical devices.

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Method to reduce distance-sensitivity within an operating range in HF-RFID WPT links

Cited by 2 publications

References 11 publications

Printed Spiral Resonator for Displacement-Tolerant Near-Field Wireless Energy Transfer

Printed Spiral Resonator for Displacement-Tolerant Near-Field Wireless Energy Transfer

Displacement-Tolerant Printed Spiral Resonator With Capacitive Compensated-Plates for Non-Radiative Wireless Energy Transfer

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