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.

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

A wearable textile antenna for wireless power transfer by magnetic resonance

2017 ◽  
Vol 88 (8) ◽  
pp. 913-921 ◽  
Author(s):  
Eunah Heo ◽  
Keun-Yeong Choi ◽  
Jooyong Kim ◽  
Jong-Hu Park ◽  
Hojin Lee
Keyword(s):  
Magnetic Resonance ◽  
Resonance Frequency ◽  
Power Transmission ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power ◽  
Human Body Model ◽  
Spiral Coil ◽  
Textile Antenna ◽  
Bending Radius

The paper presents a wearable textile antenna embroidered on a fabric for wireless power transfer systems. A planar spiral coil was generated with the conductive thread on a cotton substrate, and was connected to a rectifier circuit fabricated on flexible polyethylene terephthalate film to constitute a bendable receiver by the magnetic resonance. At a resonance frequency of 6.78 MHz, the proposed system could achieve −5.51 dB transfer efficiency and 12.75 mW power transmission at a distance of 15 cm. It was also demonstrated that the resonance frequency and transmitted power of the proposed system could be maintained as the same even when the system was bent conformingly to the surface curvature of the human body model for a bending radius up to 50 mm or larger.

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.

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