Abstract
The use of printed spiral coils (PSCs) as inductors in the construction of Wireless Power Transmission (WPT) circuits can save space and be integrated with other circuit boards. The challenges and issues of PSCs present for WPT mainly relate to maintaining an inductive characteristic at frequencies in Ultra High Frequency (UHF) band and to maximising the power transfer efficiency (PTE) between primary and secondary circuits. A new technique is proposed to increase the Q-factor relative to that offered by the PSC, which is shown to enhance WPT performance. This paper provides four-turn planar split-ring loops with high Q-factor for wireless power transmission at UHF bands. This design enhances the power transfer efficiency more than 12 times and allows for a greater transfer distance from 5 mm to 20 mm, compared with a conventional planar rectangular spiral coil.
Highlights
With the continuous progress in science and technology, a myriad of implantable medical devices (IMDs) have been invented and aimed at improving public health and wellbeing [1,2,3]
Wireless Power Transmission (WPT) technology represents an option that would allow a patient to avoid the need for additional surgeries to replace batteries, and avoid the obvious associated health risks, economic burden and patient inconvenience [4]
Far-field WPT can be sorted into directive radio frequency (RF) power beamforming and non-directive RF power beamforming [5,6]
Summary
With the continuous progress in science and technology, a myriad of implantable medical devices (IMDs) have been invented and aimed at improving public health and wellbeing [1,2,3]. Wireless Power Transmission (WPT) technology represents an option that would allow a patient to avoid the need for additional surgeries to replace batteries, and avoid the obvious associated health risks, economic burden and patient inconvenience [4]. Far-field WPT can be sorted into directive radio frequency (RF) power beamforming and non-directive RF power beamforming [5,6]. Near-field WPT can be classified into a further three approaches, namely, inductive coupling [7], magnetic resonance coupling [8] and capacitive coupling [9].
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