5.8-GHz circularly polarized dual-rhombic-loop traveling-wave rectifying antenna for low power-density wireless power transmission applications

Strassner, B.; Chang, Kai

doi:10.1109/tmtt.2003.810137

Cited by 92 publications

(37 citation statements)

References 9 publications

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“…5, reflection coefficients of the proposed antenna, truncated antenna and square antenna were −3.8 dB, −17.3 dB and −17.5 dB respectively, showing clear rejection of the second harmonic at 11.6 GHz by the proposed antenna. The axial ratio characteristics of the proposed antenna indicates circular polarization in a symmetric fashion for a much wider angular aperture of 120 0 over those of previous reports [10,11], generating circular polarization not only in the broadside direction, but also over a broad angular range of beam as shown in Fig. 6.…”

Section: Fig 1 Proposed Antennasupporting

confidence: 48%

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

Barrera

Lee

Quyet

et al. 2013

IEICE Electron. Express

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Abstract:A dual-feed circularly polarized antenna with built-in harmonic-rejection capabilities is presented for the first time. The square patch antenna has been designed at 5.8 GHz and incorporates both circular polarization and harmonic-rejection in a single design, thus eliminating the need of a low-pass filter. A comparison among the proposed antenna, a simple square patch antenna, and a truncated square patch antenna is performed to evaluate the capabilities of the proposed design. The realized antenna exhibits a reflection coefficient of −1.92 dB at the second harmonic frequency of 11.6 GHz, and circular polarization for elevation angles in the range of −60 0 to 60 0 , well suited for a rectenna in wireless power transfer applications.

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Section: Fig 1 Proposed Antennasupporting

confidence: 48%

“…Moreover, the axial ratio is kept below 2 dB within the half-power beamwidth of 80 0 . These radiation characteristics are desired for wireless power transfer applications [11]. …”

Section: Fig 1 Proposed Antennamentioning

confidence: 99%

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

Barrera

Lee

Quyet

et al. 2013

IEICE Electron. Express

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“…Researchers have come up with new solutions to improve the amount of energy being harvested from RF sources. In particular, circular polarized antennas are being implemented in the rectenna design because they avoid the directionality of other antenna designs (Strassner & Chang, 2003;Ali et al, 2005;Ren & Chang, 2006). An array of rectennas is now increasingly being used to improve the power output (Kim et al, 2006).…”

Section: Rf Harvesting Receiver System For Wsn Applicationmentioning

confidence: 99%

Sustainable Forest Management Techniques

Chethan¹,

Srinivasan²,

Kriti³

et al. 2012

Deforestation Around the World

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“…The most important issue in the rectenna design is obtaining high efficiency. Approaches like broadband antennas [23], large antenna arrays [24], and circular polarized antennas [25] have been investigated in the past several years to achieve this goal. Another approach includes the suppression of harmonics generated by the nonlinear characteristics of the diode.…”

Section: ⅳ Conversion Efficiency Of the Rectennamentioning

confidence: 99%

Wireless Power Transfer System

Arai¹

2011

Journal of electromagnetic engineering and science

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This paper presents a survey of recent wireless power transfer systems. The issue of wireless power transfer is to achieve a highly efficient system with small positioning errors of the facilities setting. Several theories have been presented to obtain precise system design. This paper presents a summary of design theory for short range power transfer systems and detailed formulations based on a circuit model and an array of infinitesimal dipoles. In addition to these theories, this paper introduces a coil array scheme for improving the efficiency for off axis coils. In the microwave range, tightly coupled resonators provide a highly efficient power transfer system. This paper present sanoverlay resonator array consisting of half wavelength microstrip line resonators on the substrate with electromagnetically coupled parasitic elements placed above the bottom resonators. The tight couplings between the waveguide and the load resonator give strong power transmission and achieve a highly efficient system, and enables a contact-less power transfer railroad. Its basic theory and a demonstration of a toy vehicle operating with this system are presented. In the last topic of this paper, harmonic suppression from the rectenna is discussed with respect to acircular microstrip antenna with slits and stubs. Ⅰ. IntroductionSeveral solutions have been proposed for wireless power transfer using electromagnetic (EM) waves. For example, Felica utilizes electromagnetically inductive coils [1] over a very short distance. One of the hottest issues is non-radiative mid-range energy transfer [2]. This has weak tolerance for positioning and the coverage area is limited near the coil, however, it is a good candidate for high power transfer for fixed to fixed point applications. After its demonstration by the MIT group, many researchers carried out further studies and presented design methods. This is sometimes referred toas "magnetic field resonance"; however, it is simply understood as the strong coupling between two resonators. Its transfer efficiencydepends heavily on the distance between coils and is around 90 % at 1 m and 40 % at 2 m [2]. Although substantial electric power transmission is expected to charge an electric vehicle, a standard of small power less than 5 W was provided by the consortium [3]. In order to charge mobile devices, the detection of the device position is a key issue. The movement of coupling coils and the coil array are major schemes for free positioning of the device to be charged. Several applications using these methods are already on the market as cell phone chargers.A basic theory for coil coupling is given by circuit theory [2], [4], and is also explained by a filter theory [5] and others. This paper presents a simple circuit theory based one lectromagnetism to find the coupling efficiency between coils. In practical power transfer applications, the efficiency is a very important factor. To improve the transfer efficiency, an parameter optimization of the coil [6] and a coil array approach ha...

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5.8-GHz circularly polarized dual-rhombic-loop traveling-wave rectifying antenna for low power-density wireless power transmission applications

Cited by 92 publications

References 9 publications

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

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

Sustainable Forest Management Techniques

Wireless Power Transfer System

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