Dome-Shaped Ellipsoidal Reflector Antenna for UHF-RFID Readers With Confined Near-Field Detection Region

Chou, Hsi‐Tseng; Cheng, Hsiang-Ting; Chou, Sheng-Ju; Kuo, Li-Ruei; Buffi, Alice; Nepa, Paolo

doi:10.1109/lawp.2017.2727077

Cited by 4 publications

(2 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, an elliptic reflector antenna is considered due to its dual-focus nature, which allows for the fields radiated by a focus feed is illuminated to the reflector and then the equal-phase scattering fields is produced at the other focus [107]. In addition to the elliptic reflector antenna, the prolate-spheroidal reflector antennas [109] and the dome-shaped ellipsoidal antennas [110] were designed based on the dual-focus feature of the geometry itself in the near-field region. Since the feed is located at either side of the two foci can create a focused beam around the other foci, an axial energy focusing is formed, where the energy is not only confined in a limited area (near-field beam focusing), also the interference effect is minimized beyond the targeted area.…”

Section: E Focused Beammentioning

confidence: 99%

A Comprehensive Survey on Transmitting Antenna Systems With Synthesized Beams for Microwave Wireless Power Transmission

Wagih

Goussetis

et al. 2023

IEEE J. Microw.

View full text Add to dashboard Cite

In recent years, microwave wireless power transmission (MWPT) has emerged as a promising technology for supplying energy by receiving radiative power without wires and converting it into DC power. A high transmission efficiency is crucial for improving the performance of MWPT systems. To address the challenge of propagation loss, beam synthesis using transmitting antennas has gained significant attention, resulting in several synthesis methods becoming available, including whisper beams, flat-top beams, nondiffractive beams, supergain/superdirective beams, focused beams and adaptive beamforming technique such as time reversal methods. This comprehensive review covers these advanced beam synthesis techniques for MWPT transmitters and provides a detailed comparison of different synthesized beams. The article includes an in-depth discussion on current designs and existing technological challenges, as well as suggestions for future research directions. Although beam synthesis can substantially improve the transmission efficiency, the overall power transfer efficiency of the entire MWPT system still requires improvement as the performance, including impedance matching, is currently only considered at a component level and not at a system level. Furthermore, when using advanced beam synthesis techniques, the engineering and implementation challenges of high power (≥kW) and long-distance (≥km) MWPT become significant issues due to the high cost and large size involved. The review concludes that existing technologies for synthesized beams still require significant long-term efforts to meet the realistic engineering requirements for achieving highly efficient MWPT systems. The joint utilization of beam synthesis techniques and comprehensive system matching/optimization is identified as a research direction with the potential to realize highly efficient MWPT systems, offering foreseeable impacts in both terrestrial and space-based MWPT applications. This review serves as a solid foundation for the design of transmitter antennas in long-distance, high-power MWPT systems, and furthermore provides novel insights for future designs of highly efficient MWPT systems.INDEX TERMS Beam synthesis technology, rectennas, wireless power transfer, flattop beam, non-diffractive beam, supergain/superdirective beam, focused beam, time reversal, adaptive beamforming technique.

show abstract

Section: E Focused Beammentioning

confidence: 99%

A Comprehensive Survey on Transmitting Antenna Systems With Synthesized Beams for Microwave Wireless Power Transmission

Wagih

Goussetis

et al. 2023

IEEE J. Microw.

View full text Add to dashboard Cite

show abstract

“…To design a narrow-beam antenna, two typical methods have been employed. One method is to employ a single antenna element, such as lens antennas, [6][7][8] reflector antennas [9][10][11][12] , and leaky-wave antenna. 13 The other method is to use an antenna array.…”

Section: Introductionmentioning

confidence: 99%

Dual‐wideband dual‐polarized rhombic antenna array for base‐station applications

et al. 2022

Micro & Optical Tech Letters

View full text Add to dashboard Cite

A compact dual‐wideband dual‐polarized antenna array with a narrow beam and low side‐lobe level for indoor base‐station applications is presented. Four higher‐band dipole elements are inserted inside four lower‐band rhombic‐arranged dipole elements. Dipole elements for each band are excited by two 1‐to‐4 power dividers with equal magnitude and phase. By using this scheme, stable narrow radiation patterns with low side‐lobe levels both in the horizontal and vertical planes are obtained over the dual‐frequency bands. For verification, a dual‐wideband rhombic antenna array with bandwidths of 49.3% (0.64–1.06 GHz) and 52.3% (1.61–2.75 GHz) for VSWR < 1.5 is designed. It has a stable radiation pattern with 3‐dB beamwidths of around 33° and low side‐lobe levels of less than −22 dB both in the horizontal and vertical planes.

show abstract

Design and implementation of an S‐band near‐field focused array with high E‐field strength

Li,

Tian,

Cheng

et al. 2024

IET Microwaves Antenna & Prop

View full text Add to dashboard Cite

An S‐band near‐field focused array is designed and implemented. Consisting of 4 × 4 metallic Vivaldi elements, the array is designed for focusing the E‐field of several kilovolts per metre within its near‐field region. To minimise the power loss and enhance the synthesis effectiveness, elements are arranged on a sphere surface and oriented towards the sphere centre. When exciting the elements, the waves will be focused to a specific area on the observation plane. By adjusting the excitation phase, the focus position can be tuned. A systematic analysis has been carried out to illustrate the focus scanning process across the entire observation plane. Near‐field two‐dimensional scanning is performed to measure the E‐field distribution of the array. While scanning the focus, the diameter of 3 dB focal area is about 0.3 m, and the maximum field strength in the focus ranges from 1184 to 2129 V/m, which can be used for the radiated susceptibility testing.

show abstract

Dome-Shaped Ellipsoidal Reflector Antenna for UHF-RFID Readers With Confined Near-Field Detection Region

Cited by 4 publications

References 6 publications

A Comprehensive Survey on Transmitting Antenna Systems With Synthesized Beams for Microwave Wireless Power Transmission

A Comprehensive Survey on Transmitting Antenna Systems With Synthesized Beams for Microwave Wireless Power Transmission

Dual‐wideband dual‐polarized rhombic antenna array for base‐station applications

Design and implementation of an S‐band near‐field focused array with high E‐field strength

Contact Info

Product

Resources

About