scholarly journals Ka-Band Rotman Lens-Based Retrodirective Beamforming System for Wireless Power Transfer

2021 ◽  
Vol 21 (5) ◽  
pp. 391-398
Author(s):  
Hayoung Hong ◽  
Hongsoo Park ◽  
Kanghyeok Lee ◽  
Wonwoo Lee ◽  
Semin Jo ◽  
...  
Keyword(s):  
Time Delay ◽  
Low Cost ◽  
Wireless Power Transfer ◽  
Impedance Bandwidth ◽  
Far Field ◽  
Power Transfer ◽  
Wireless Power ◽  
Ka Band ◽  
True Time Delay ◽  
True Time

A retrodirective beamforming system (BFS) based on a Rotman lens is proposed for far-field wireless power transfer at Ka-band. The true-time-delay property of the Rotman lens allows for a wideband operation covering 28–38 GHz. The designed BFS comprises a Rotman lens with nine beam ports connected to a nine-element linear Vivaldi array. The proposed BFS is implemented using PCB technology for ease of manufacturing and low-cost processing. The simulated and measured results demonstrate that the proposed BFS can generate nine discrete beams over a scan range of ±45° with a wide impedance bandwidth.

scholarly journals Micro air vehicles energy transportation for a wireless power transfer system

2019 ◽  
Vol 11 ◽  
pp. 175682931987005
Author(s):  
Jose Polo ◽  
Lluís Hontecillas ◽  
Ignacio Izquierdo ◽  
Oscar Casas
Keyword(s):  
Temperature Sensor ◽  
Sensor Node ◽  
Low Cost ◽  
Wireless Power Transfer ◽  
Micro Air Vehicles ◽  
Power Transfer ◽  
Wireless Power ◽  
Inductive System ◽  
Energy Transportation ◽  
Air Vehicles

The aim of this work is to demonstrate the feasibility use of an Micro air vehicles (MAV) in order to power wirelessly an electric system, for example, a sensor network, using low-cost and open-source elements. To achieve this objective, an inductive system has been modelled and validated to power wirelessly a sensor node using a Crazyflie 2.0 as MAV. The design of the inductive system must be small and light enough to fulfil the requirements of the Crazyflie. An inductive model based on two resonant coils is presented. Several coils are defined to be tested using the most suitable resonant configuration. Measurements are performed to validate the model and to select the most suitable coil. While attempting to minimize the weight at transmitter’s side, on the receiver side it is intended to efficiently acquire and manage the power obtained from the transmitter. In order to prove its feasibility, a temperature sensor node is used as demonstrator. The experiment results show successfully energy transportation by MAV, and wireless power transfer for the resonant configuration, being able to completely charge the node battery and to power the temperature sensor.

scholarly journals A performance predictor of beamforming versus time-reversal based far-field wireless power transfer from linear array

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hong Soo Park ◽  
Sun K. Hong
Keyword(s):  
Time Reversal ◽  
Power Transmission ◽  
Linear Array ◽  
Wireless Power Transfer ◽  
Far Field ◽  
Power Transfer ◽  
Wireless Power ◽  
Dynamic Propagation ◽  
Received Power ◽  
Indoor Scenarios

AbstractFor far-field wireless power transfer (WPT) in a complex propagation environment, a time-reversal (TR) based WPT that can overcome the drawbacks of conventional beamforming (BF) by taking advantage of multipath has been recently proposed. However, due to the WPT performance of BF and TR depending on the complexity of the propagation environment, the performance prediction between BF versus TR would be required. We present a detailed and generalized analysis of the recently proposed performance metric referred to as the peak received power ratio (PRPR) for linear array-based WPT. Here, the effectiveness of PRPR is verified via measurement for free space and indoor scenarios. The results demonstrate that PRPR is directly related to the complexity of the propagation environment and the corresponding power transmission capability of BF and TR. That is, the higher the complexity, the greater the value of PRPR and TR outperforms BF with higher peak power given the same average transmit power and vice versa. The mode decision between BF and TR based on PRPR potentially promises efficient far-field WPT even in a dynamic propagation environment.

scholarly journals Output Voltage and Resistance Assessment of Load-Independent-Voltage-Output Frequency Operating Inductive Wireless Power Transfer Link Utilizing Input DC-Side Measurements Only

Electronics ◽  
2021 ◽  
Vol 10 (17) ◽  
pp. 2109
Author(s):  
Or Trachtenberg ◽  
Alon Kuperman
Keyword(s):  
Output Voltage ◽  
Low Cost ◽  
Wireless Power Transfer ◽  
Equivalent Model ◽  
Estimation Accuracy ◽  
Static System ◽  
Power Transfer ◽  
Wireless Power ◽  
Voltage Output ◽  
Conduction Mode

The paper puts forward a method for predicting output voltage and resistance of a series-series (SS) compensated inductive wireless power transfer (IWPT) link operating at load-independent-voltage-output (LIVO) frequency. The link is a part of the static system (reported by the authors in earlier works), wirelessly delivering power into an enclosed compartment without any secondary-to-primary feedback. The proposed algorithm employs input DC-side quantities (which are slow-varying and nearly noise-free, thus measured utilizing low-cost, low-bandwidth sensors) only to monitor output DC-side quantities, required for protection and/or control. It is shown that high estimation accuracy is retained as long as system parameter values are known and the phasor-domain equivalent circuit is valid (i.e., upon continuous-conduction mode (CCM) of the diode rectifier, where the proposed methodology utilizes the recently revealed modified diode rectifier equivalent model for enhanced accuracy). Under light loading (i.e., in discontinuous conduction mode (DCM)), a nonlinear correction is combined with the proposed technique to retain accuracy. The proposed methodology is well-verified by application to a 400 V to 400 V, 1 kW static IWPT link by simulations and experiments.

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