scholarly journals A Novel Three-Dimensional Beamforming Antenna Array for Wireless Power Focusing

2016 ◽  
Vol 2016 ◽  
pp. 1-8
Author(s):  
Mohammad A. Safar ◽  
Ayman S. Al-Zayed
Keyword(s):  
Antenna Array ◽  
Power Transmission ◽  
Three Dimensional ◽  
Wireless Power ◽  
Dipole Antennas ◽  
Multiple Points ◽  
Additional Degree ◽  
Points Of Interest ◽  
Power Transfer Efficiency ◽  
Array Structure

An antenna array capable of focusing the power transmitted to a specified point in space is modeled and simulated. This array will serve best for wireless power transmission applications where one of the goals is to maximize the power transfer efficiency. The array consists of 100 dipole antennas with each antenna transmitting a sum of 50 signals where each signal has a different frequency. This difference in frequency gives an additional degree of freedom that allows the overall beam pattern to be focused to a point in space instead of just a direction. The same array structure is also capable of transmitting power to multiple points in space which is promising when it comes to powering multiple points of interest.

scholarly journals 3D Antenna Characterization for WPT Applications

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4461
Author(s):  
Marina Jordão ◽  
Diogo Pires ◽  
Daniel Belo ◽  
Pedro Pinho ◽  
Nuno Borges Carvalho
Keyword(s):  
Antenna Array ◽  
Antenna Arrays ◽  
Power Transmission ◽  
3D Structure ◽  
Three Dimensional ◽  
Experimental Results ◽  
Antenna Design ◽  
Wireless Power ◽  
Characterization Technique ◽  
Specific Direction

The main goal of this paper is to present a three-dimensional (3D) antenna array to improve the performance of wireless power transmission (WPT) systems, as well as its characterization with over-the-air (OTA) multi-sine techniques. The 3D antenna consists of 15 antenna elements attached to an alternative 3D structure, allowing energy to be transmitted to all azimuth directions at different elevation angles without moving. The OTA multi-sine characterization technique was first utilized to identify issues in antenna arrays. However, in this work, the technique is used to identify which elements of the 3D antenna should operate to transmit the energy in a specific direction. Besides, the 3D antenna design description and its characterization are performed to authenticate its operation. Since 3D antennas are an advantage in WPT applications, the antenna is evaluated in a real WPT scenario to power an RF–DC converter, and experimental results are presented.

Efficient Rectenna Circuit for Wireless Power Transmission

2020 ◽  
pp. 57-65
Author(s):  
Anurag Saxena ◽  
Paras Raizada ◽  
Lok Prakash Gautam ◽  
Bharat Bhushan Khare
Keyword(s):  
Resonant Frequency ◽  
Power Transmission ◽  
Numerical Data ◽  
Electrical Energy ◽  
Single Band ◽  
Impedance Bandwidth ◽  
Power Transfer ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Power Transfer Efficiency

Wireless power transmission is the transmission of electrical energy without using any conductor or wire. It is useful to transfer electrical energy to those places where it is hard to transmit energy using conventional wires. In this chapter, the authors designed and implemented a wireless power transfer system using the basics of radio frequency energy harvesting. Numerical data are presented for power transfer efficiency of rectenna. From the simulated results, it is clear that the anticipated antenna has single band having resonant frequency 2.1 GHz. The anticipated antenna has impedance bandwidth of 62.29% for single band. The rectenna has maximum efficiency of 60% at 2.1 GHz. The maximum voltage obtained by DC-DC converter is 4V at resonant frequency.

scholarly journals Circularly Polarized Retrodirective Antenna Array for Wireless Power Transmission

2020 ◽  
Vol 68 (4) ◽  
pp. 2743-2752 ◽  
Author(s):  
Pascual D. Hilario Re ◽  
Symon K. Podilchak ◽  
Samuel A. Rotenberg ◽  
G. Goussetis ◽  
Jaesup Lee
Keyword(s):  
Antenna Array ◽  
Power Transmission ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Circularly Polarized

scholarly journals Wireless Power Hanger Pad for Portable Wireless Audio Device Power Charger Application

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 419
Author(s):  
Win-Jet Luo ◽  
C. Bambang Dwi Kuncoro ◽  
Yean-Der Kuan
Keyword(s):  
Power Transmission ◽  
Evaluation Criteria ◽  
Wireless Power ◽  
Transmission Distance ◽  
Coil Diameter ◽  
Battery Capacity ◽  
Power Transfer Efficiency ◽  
Commercial Off The Shelf ◽  
Flat Spiral ◽  
Audio Device

Since the portability feature has been introduced in headphone development, this device now uses a battery as the main built-in power. However, the battery has limited power capacity and a short lifetime. Battery substitution and a conventional battery charger method is an ineffective, inflexible inconvenience for enhancing the user experience. This paper presents an innovative portable audio device battery built-in charger method based on wireless power technology. The developed charging device is composed of a headphone hanger pad for the wireless headphone and a charging pad for the portable wireless audio device battery charging. Circular flat spiral air-core coil was designed and evaluated using a numerical method to obtain optimal vertical magnetic field distribution based on the proposed evaluation criteria. A coil has inner coil diameter of 25 mm, outer coil diameter of 47.8 mm, wire diameter of 0.643 mm, the pitch of 0.03 mm and a number of turns of 17 was chosen to be implemented on the transmitter coil. A magnetic induction technique was adopted in the proposed wireless power transmission module which was implemented using commercial off-the-shelf components. For experimental and validation purposes, a developed receiver module applied to the commercial wireless headphone and portable audio speaker have a built-in battery capacity at 3.7 V 300 mAh. The experimental results show that the wireless power hanger pad prototype can transfer a 5 V induction voltage at a maximum current of 1000 mA, and the power transfer efficiency is around 70%. It works at 110 kHz of operation frequency with a maximum transmission distance of about 10 mm and takes 1 h to charge fully one 3.7 V 300 mAh polymer lithium battery.

scholarly journals Wireless Power Transfer Approaches for Medical Implants: A Review

Signals ◽  
2020 ◽  
Vol 1 (2) ◽  
pp. 209-229
Author(s):  
Mohammad Haerinia ◽  
Reem Shadid
Keyword(s):  
Power Transmission ◽  
Ultrasonic Method ◽  
Inductive Coupling ◽  
Operating Frequency ◽  
Power Transfer ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Implantable Medical Devices ◽  
Design Elements ◽  
Power Transfer Efficiency

Wireless power transmission (WPT) is a critical technology that provides an alternative for wireless power and communication with implantable medical devices (IMDs). This article provides a study concentrating on popular WPT techniques for IMDs including inductive coupling, microwave, ultrasound, and hybrid wireless power transmission (HWPT) systems. Moreover, an overview of the major works is analyzed with a comparison of the symmetric and asymmetric design elements, operating frequency, distance, efficiency, and harvested power. In general, with respect to the operating frequency, it is concluded that the ultrasound-based and inductive-based WPTs have a low operating frequency of less than 50 MHz, whereas the microwave-based WPT works at a higher frequency. Moreover, it can be seen that most of the implanted receiver’s dimension is less than 30 mm for all the WPT-based methods. Furthermore, the HWPT system has a larger receiver size compared to the other methods used. In terms of efficiency, the maximum power transfer efficiency is conducted via inductive-based WPT at 95%, compared to the achievable frequencies of 78%, 50%, and 17% for microwave-based, ultrasound-based, and hybrid WPT, respectively. In general, the inductive coupling tactic is mostly employed for transmission of energy to neuro-stimulators, and the ultrasonic method is used for deep-seated implants.

scholarly journals Reconfigurable Wireless Power Transmission in Fully-Enclosed Space Using Antenna Array

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 173098-173110 ◽  
Author(s):  
Xin Wang ◽  
Xueqi Wang ◽  
Mengying Li ◽  
Mingyu Lu
Keyword(s):  
Antenna Array ◽  
Power Transmission ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Enclosed Space
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