3D Antenna Characterization for WPT Applications

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.

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

Mathematical Problems in Engineering ◽

10.1155/2016/7426429 ◽

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.

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Spherical Helices for Resonant Wireless Power Transfer

International Journal of Antennas and Propagation ◽

10.1155/2013/426574 ◽

2013 ◽

Vol 2013 ◽

pp. 1-12 ◽

Cited By ~ 5

Author(s):

Maja Škiljo ◽

Zoran Blažević

Keyword(s):

Radiation Resistance ◽

Power Transmission ◽

Wireless Power Transfer ◽

Antenna Design ◽

Impedance Match ◽

Wireless Power ◽

Radiation Characteristics ◽

Antenna Size ◽

Helical Antennas ◽

Theoretical Considerations

The capabilities of electrically small spherical helical antennas for wireless power transmission at small and moderate distances are analyzed. Influence of design on antenna radiation resistance, efficiency, and mode ratio is examined. These are the factors that, according to the theoretical considerations depicted herein, govern the maximum transfer performances. Various designs and configurations are considered for the purpose, with accent on small-size receivers suitable for implementation in powering common-sized gadgets. It is shown that spherical helix design is easily manipulated to achieve a reduced antenna size. Good radiation characteristics and impedance match are maintained by multiple-arm folded antenna design and by adjusting the separation between the arms.

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