Wireless energy transfer‐based transceiver systems for power and/or high‐data rate transmission through thick metal walls using sheet‐like waveguides

Abstract

The potential use of sheet-like waveguide-based wireless energy transfer systems for a two-way power and/or high-data rate transmissionreception through thick metal walls is investigated. The proposed system utilises the near-field evanescent wave concept to transmit energy and/or data. Compared with wireless energy transfer devices based on magnetic resonance coupling, the transmission efficiency of the investigated method is not affected by the shielding offered by metal sheets. For the investigation, a 150 × 150 mm 2 sheet-like waveguide transmitter and a cylindrical wave-cavity receiver were designed. The receiver achieved a transfer efficiency of −3.76 dB, while transmitting power through galvanised iron sheets. The prime objective of this investigation was to sustain the power and/or data transfer efficiency despite the variation of the obstructing metal wall thicknesses from 1.5 to 22.5 mm. The proposed system was designed to operate at 25 MHz, enabling 50 Mbit/s data transfer using a function generator.

Fringing Effect Analysis of Parallel Plate Capacitors for Capacitive Power Transfer Application

“…Capacitive power transfer (CPT) is one of the wireless power transfer methods that using high frequency electric field as the energy transferring medium. Several advantages have been proved from prior arts regarding this method, including tolerance to metal objects [1], cost effective [2] and low standby power loss [3] [4]. In a CPT application, wireless couplers between the transmitter and receiver are, typically, two or more parallel plate capacitors (PP-Cap), as shown in Fig.1.…”

Hybrid coupler for 6.78 MHz desktop wireless power transfer applications with stable open‐loop gain

“…As will be explained in the next section, the gain curve of both IPT and CPT is determined by Q value of the resonant tank, as shown in formula (12) and (21). The Q value is affected by the ratio of coupling capacitance and its compensation inductance Lc for CPT (coil inductance and its compensation capacitance Cp for IPT).…”

“…After getting the DC gain of IPT and CPT, the gain of HWPT system can be derived. According to (12) and (21), quality factor Q is affected by equivalent load resistance. The higher load resistance means lower Q value and higher gain as shown in Fig.…”

“…Rac_CPT and Rac_IPT are the equivalent resistance seen by IPT and CPT respectively. According to(12) and(21), Profile of current and output voltage when capacitance changes (a) hybrid coupler when capacitance change from 70pF to 480pF, (b) CPT when capacitance change from 70pF to 480pF…”

The Optimization Based Dynamic and Cyclic Working Strategies for Rechargeable Wireless Sensor Networks with Multiple Base Stations and Wireless Energy Transfer Devices

“…Based on this phenomenon, they developed a touch/proximity/hover sensing system using such property of wireless energy transfer [ 35 ]. They also developed a wireless energy transfer system for power and/or high-data rate transmission using sheet-like waveguides [ 36 ]. This system is still capable while transferring energy and/or data through thick metal walls.…”