scholarly journals A Complete System of Wireless Power Transfer Using a Circularly Polarized Retrodirective Array

2020 ◽  
Vol 20 (2) ◽  
pp. 139-144 ◽  
Author(s):  
Mohammad Fairouz ◽  
Mohammad A. Saed
Keyword(s):  
Surface Waves ◽  
Complete System ◽  
Wireless Power Transfer ◽  
Detection Sensitivity ◽  
Antenna Element ◽  
Power Transfer ◽  
Wireless Power ◽  
Zero Bias ◽  
Circularly Polarized ◽  
Retrodirective Array

A complete system of wireless power transfer using a circularly polarized retrodirective array is presented. A dual frequency, active retrodirective array is proposed for a transmitter system. The antenna array uses circularly polarized microstrip patch antenna subarrays with sequential rotation and surface wave suppression. The designed antenna element eliminates undesired coupling between array elements due to surface waves present in conventional microstrip antenna arrays in order to improve array performance. A sequential rotation technique was implemented to improve impedance matching and circular polarization bandwidths. The proposed retrodirective array was designed to operate at about 2.4 GHz for the interrogating signal and about 5.8 GHz for the retransmitted signal. The beam scanning inherent in retrodirective arrays ensures a uniform power level available to the receiving devices, regardless of their location within the angular sector over which retrodirectivity is achieved. A rectenna was designed as a receiver in order to have a complete system the wireless power transfer. A zero bias Schottky diode with high detection sensitivity was used as the rectifying device. The shorting pins used in the antennas to suppress surface waves also act as return paths for the DC current, eliminating the need for an RF chock in the rectifier circuit. The design procedure, simulation results, and experimental measurements are presented.

A circularly polarized wideband high gain patch antenna for wireless power transfer

2018 ◽  
Vol 60 (3) ◽  
pp. 620-625 ◽  
Author(s):  
C. A. Di Carlo ◽  
L. Di Donato ◽  
G. S. Mauro ◽  
R. La Rosa ◽  
P. Livreri ◽  
...  
Keyword(s):  
Patch Antenna ◽  
Wireless Power Transfer ◽  
High Gain ◽  
Power Transfer ◽  
Wireless Power ◽  
Circularly Polarized

scholarly journals A Circularly Polarized Implantable Rectenna for Microwave Wireless Power Transfer

Micromachines ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 121
Author(s):  
Chao Xu ◽  
Yi Fan ◽  
Xiongying Liu
Keyword(s):  
Wireless Power Transfer ◽  
Axial Ratio ◽  
Input Power ◽  
Impedance Bandwidth ◽  
Power Transfer ◽  
Wireless Power ◽  
Circularly Polarized ◽  
Rectangular Slot ◽  
Dc Power ◽  
Implantable Antenna

A circularly polarized implantable antenna integrated with a voltage-doubled rectifier (abbr., rectenna) is investigated for microwave wireless power transfer in the industrial, scientific, and medical (ISM) band of 2.4–2.48 GHz. The proposed antenna is miniaturized with the dimensions of 7.5 mm × 7.5 mm × 1.27 mm by etching four C-shaped open slots on the patch. A rectangular slot truncated diagonally is cut to improve the circular polarization performance of the antenna. The simulated impedance bandwidth in a three-layer phantom is 30.4% (1.9–2.58 GHz) with |S11| below −10 dB, and the 3-dB axial-ratio bandwidth is 16.9% (2.17–2.57 GHz). Furthermore, a voltage-doubled rectifier circuit that converts RF power to DC power is designed on the back of the antenna. The simulated RF-to-DC conversion efficiency can be up to 45% at the input power of 0 dBm. The proposed rectenna was fabricated and measured in fresh pork to verify the simulated results and evaluate the performance of wireless power transfer.

scholarly journals Compact zeroth-order resonator (ZOR) antennas

2019 ◽  
Vol 6 ◽  
pp. 6
Author(s):  
Jae-Gon Lee ◽  
Jeong-Hae Lee
Keyword(s):  
Resonance Frequency ◽  
Transmission Lines ◽  
Wireless Power Transfer ◽  
Double Negative ◽  
Power Transfer ◽  
Wireless Power ◽  
Zeroth Order ◽  
Circularly Polarized ◽  
Order Resonance ◽  
Physical Length

In this paper, we introduce and review the zeroth-order resonator (ZOR) antennas with outstanding characteristics including various applications that have been researched so far. Since the zeroth-order resonance frequency is independent of a physical length of antenna, the ZOR antenna can theoretically be designed quite small and have a possibility to apply to considerably lots of applications. First, we have presented the ZOR antennas implemented by double-negative (DNG), epsilon-negative (ENG), and mu-negative (MNG) transmission lines. Then, the research related on extremely small, wide beamwidth, wideband, and circularly polarized (CP) ZOR antennas have been continuously carried out. Based on a series of these studies, the ZOR antennas were utilized for various applications such as a wireless power transfer (WPT), a compact controlled reception pattern antenna (CRPA), a penta-band mobile antenna, and a wide steering array antenna.

scholarly journals A circularly polarized harmonic-rejecting antenna for wireless power transfer applications

2013 ◽  
Vol 10 (19) ◽  
pp. 20130665-20130665 ◽  
Author(s):  
Omar A. Barrera ◽  
Dong Hyun Lee ◽  
Nguyen Manh Quyet ◽  
Viet Hoang-The ◽  
Hyun Chang Park
Keyword(s):  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Circularly Polarized

scholarly journals Broadband Circularly Polarized Rectenna With Wide Dynamic-Power-Range for Efficient Wireless Power Transfer

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 80561-80571
Author(s):  
Zhi-Xia Du ◽  
Shao Fei Bo ◽  
Yun Fei Cao ◽  
Jun-Hui Ou ◽  
Xiu Yin Zhang
Keyword(s):  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Circularly Polarized ◽  
Dynamic Power
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