2-D Van Atta Array of Wideband, Wideangle Slots for Radiative Wireless Power Transfer Systems

Ettorre, Mauro; Alomar, Waleed A.; Grbic, Anthony

doi:10.1109/tap.2018.2851197

Cited by 37 publications

(11 citation statements)

References 26 publications

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“…Utility for beam steering in both the elevation and azimuth is reported, and, thanks to the achieved isolation between the input and output ports, a DCP retrodirective antenna array (RDA) is measured as an application example as well as sum and difference patterns. In this respect, similar investigations have been reported in [3]- [7] and [21], [22], respectively, but with different antenna designs. The key element of our proposed isolation approach in this paper consists of the integration of a hybrid feed system for the radiating patches in conjunction with additional slots enabling cancellation of the relevant currents, both at the patch aperture level and within the feed system itself.…”

Section: And 3)supporting

confidence: 79%

“…with the advent of advanced applications based on massive multiple input multiple output (MIMO) and indoor retrodirective wireless power transfer systems (see, e.g., [2]- [7]), the utilization of a two-port antenna for both transmission (Tx) and reception (Rx), can bring significant real estate advantages, especially when considering the bulkiness and possible compactness of the antenna system. For such applications, the need of self-interference (SI) remains a very critical and challenging constraint.…”

Section: Introductionmentioning

confidence: 99%

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Dual-Polarized Aperture-Coupled Patch Antennas With Application to Retrodirective and Monopulse Arrays

et al. 2020

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An isolation technique, which does not require conventional circulators, is proposed for the realization of a simple and low-cost aperture-coupled circularly polarized antenna for application to fullduplex devices. The approach is based on the use of slotlines loops to provide surface current cancellation in specific regions of the antenna structure, leading to improved axial ratio and isolation between the ports in excess of 50 dB. Circular polarization is achieved by introducing a double-box hybrid coupler, which is optimized to obtain good matching and isolation of the quadrature signals. On this basis, both right-and lefthand circularly polarized beams are achieved by interchanging the transmitting and receiving antenna ports, enabling full-duplex operation and reconfigurability. While the antenna structure is designed for 2.45 GHz operation, one can take advantage of the proposed approach to tune the frequency of maximum isolation. Both single-element prototypes as well as a 2×2 array are fabricated and measured, showing good agreement with the simulations and validating the proposed isolation approach. The beam steering capabilities as well as the application to a Van Atta retrodirective antenna array and the possibilities of achieving delta and sum patterns for monopulse operation are also reported. The proposed full-duplex antenna can also represent an excellent solution for narrowband wireless power transmission systems.

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Section: And 3)supporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Dual-Polarized Aperture-Coupled Patch Antennas With Application to Retrodirective and Monopulse Arrays

et al. 2020

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“…A summary of the cut-off frequencies of different modes is presented for both conventional PPW and LCPPW in Table II. Additionally, the slots can be fed using coaxial probes or crossed dipoles placed in the very proximity of the aperture [27]- [29]. The latter solution helps in mitigating the different dispersive behaviour of TEM and TE 1 modes.…”

Section: B Feeding Systemmentioning

confidence: 99%

Analysis of Circularly Polarized CTS Arrays

Mastro

Manzillo

González‐Ovejero

et al. 2020

IEEE Trans. Antennas Propagat.

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This paper presents an efficient analysis method for a novel continuous transverse stub (CTS) antenna. As opposed to state-of-the-art CTS antenna designs, the proposed architecture achieves circular polarization using a single CTS array and without any polarization converter. The structure consists of long radiating slots/stubs fed by over-moded parallel-plate waveguides. More precisely, the transverse electromagnetic (TEM) mode and the first transverse electric (TE1) mode of the feeding waveguides are used to generate a circularly-polarized field. The array is analyzed using a spectral mode-matching method. First, the active reflection coefficient of the infinite array is derived in closed form. A windowing approach is then adopted to compute the radiation patterns of finite-size arrays. Numerical results obtained with this method are in excellent agreement with fullwave simulations, carried out with a commercial software. The performance of this class of CTS antennas has been investigated using the developed model. It is theoretically demonstrated that the proposed array can be designed to attain an axial-ratio (AR) lower than 3 dB over a 52.9% relative bandwidth at broadside. Furthermore, the active input reflection coefficient is lower than-10 dB over a 40.8% relative bandwidth when the array steers its main beam at θ0 = 45 •. This solution is an attractive candidate for next generation satellite communication terminals. Index Terms-Continuous transverse stub array, circular polarization, oversized parallel-plate waveguides.

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“…Other interesting contributions that require less signal processing rely on antenna systems capable of automatically tracking the direction of arrival, such as retro-directive antennas [10], [22]- [25]. They typically consist of simple radiating elements in array configuration connected to a circuit network that conjugates the phase of the incident signal in order to transmit in the same direction.…”

Section: Related Workmentioning

confidence: 99%

Dynamic Wireless Power Transfer for Cost-Effective Wireless Sensor Networks Using Frequency-Scanned Beaming

et al. 2019

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A simple adaptive 1-D frequency-scanning method is proposed for radiative wireless power transfer (WPT) systems in low-power wireless sensor networks (WSNs). As a proof of concept, a directive leaky-wave antenna that scans 1-W output RF power in the angular range from ±10 • at 2.4 GHz to ±37 • at 2.5 GHz, is used to power a WSN covering an area of 1.2 m × 1.2 m. It is shown that, using a frequencyscanned antenna, a wider area than using a non-scanned directive antenna can be powered without additional expensive equipment. The WPT protocol is described, showing that any sensor in the WSN can select the optimum transmission channel in the 2.4-GHz band, based on the received signal strength indicator measurements, as the coordinator performs a scheduled frequency hopping phase. This maximizes the WPT beaming efficiency and the transferred dc power. The optimum channel selection can be performed periodically, which makes the system robust against channel state changes. INDEX TERMS Adaptive beaming, frequency-scanned antennas, radiative wireless power transfer, wireless sensor network.

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2-D Van Atta Array of Wideband, Wideangle Slots for Radiative Wireless Power Transfer Systems

Cited by 37 publications

References 26 publications

Dual-Polarized Aperture-Coupled Patch Antennas With Application to Retrodirective and Monopulse Arrays

Dual-Polarized Aperture-Coupled Patch Antennas With Application to Retrodirective and Monopulse Arrays

Analysis of Circularly Polarized CTS Arrays

Dynamic Wireless Power Transfer for Cost-Effective Wireless Sensor Networks Using Frequency-Scanned Beaming

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