Design and Realization of a Flat-Top Shaped-Beam Antenna Array

Zhou, Haijin; Huang, You-Huo; Sun, B. H.; Liu, and Qi-Zhong

doi:10.2528/pierl08111911

Cited by 23 publications

(9 citation statements)

References 6 publications

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“…number, and HPBW respectively stand for polarization, element number, and half-power beamwidth of an array antenna. In [25] and [26], they formed the feeding network with the microstrip-line dividers based on parallel feed. Parallel feed is very useful in terms of isolation between ports.…”

Section: Introductionmentioning

confidence: 99%

Large-Scale Sequentially-Fed Array Antenna Radiating Flat-Top Beam for Microwave Power Transmission to Drones

et al. 2022

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Power beaming is one of the core technologies for microwave power transmission (MPT) systems. Effective plane-to-plane power beaming requires not only high point-to-point efficiency but also appropriately-shaped beam to extract the best performance of receivers (rectennas). Flat-top beam plays an important role in plane-to-plane power beaming for drones where the output dc power from rectennas should be maximized to drive motors. It is challenging to develop a large-scale flat-top-beam array with appropriate distribution circuits. Sequential array is also required to suppress axial ratio on the receiving plane. In this paper, we proposed a simplified but effective way to create a large-scale sequential array for flat-top beam at C-band. The series feed and block-oriented sequential array were adopted to keep the circuit design and fabrication simple while obtaining a sufficient point-to-point efficiency and good axial ratio on the receiving plane. A 196-element phased array with microstrip antennas was developed by subdividing the whole array into four 49-element blocks for simplicity of the circuit design and implementation of block-oriented sequential array. The efficiency between the transmitting ports and the receiving ports was 50.6 % in simulations and 32.0 % in measurements. In the measured flat-top beam, the transmitted power was uniformly concentrated within the receiving plane and the axial ratio of the beam was successfully suppressed to less than 3 dB on most of the receiving area. A flight test of a microwave-powered drone was conducted where a micro-drone successfully flew for seven minutes only with wireless power.INDEX TERMS Drone, flat-top beam, large-scale array, microwave power transmission, sequential array.

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Section: Introductionmentioning

confidence: 99%

Large-Scale Sequentially-Fed Array Antenna Radiating Flat-Top Beam for Microwave Power Transmission to Drones

et al. 2022

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“…Hence, the antennas with a flat pattern have been used in modern communication systems to serve uniform signal strength within the desired coverage area. Adaptive phased array antennas can provide flat-top radiation patterns by controlling the amplitude and phase of the individual antenna elements [1][2][3][4]. The amplitude and phases of the antenna elements are synthesized using various optimization algorithms.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Dual-Band Flat-Top Pattern Using Polarization Dependent Metasurface

Kumar¹,

Ghosh²

2021

PIER Letters

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A simple and novel polarization-dependent phase gradient metasurface (PGMS) is proposed to synthesize a flat-top radiation pattern by dividing the metasurface (MTS) into multiple regions. Each sub-region generates a beam in a particular direction, and multiple beams with different directions form a flat-top pattern in the far-field. A flat-top pattern in a single and 3D plane is realized by dividing the MTS into two and four regions, respectively. The proposed MTS consists of a multi-layered elliptical geometry encircled by a square loop. The elliptical shape of the unitcell offers polarization-dependent behavior and produces dual-band characteristics for different incident wave polarizations at 10 and 12 GHz. Two microstrip patch antennas operating at 10 GHz and 12 GHz are placed at the focal point of the MTS. The simulated flat-top beamwidths in a single plane with a 1 dB ripple are 36 • and 34 • at 10 and 11.8 GHz, respectively. Similarly, in 3D space, the beamwidths are 33 • and 31 • at 10 and 11.8 GHz, respectively. Both simulated and measured results are presented for 3D flat-top patterns.

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“…Moreover, compact antennas for minimizing the environment impact, made with low‐cost materials and ease of implementation and matching have been desired. However, sectored antennas are usually designed with the help of the reflectors [13–17]. One common technique of sectored antenna is to place a flat conducting reflector at a fixed distance away from antenna [18, 19].…”

Section: Introductionmentioning

confidence: 99%

Wideband constant beamwidth coplanar waveguide-fed slot antennas using metallic strip loadings and a widened tuning stub with shaped reflectors

Chaimool

Akkaraekthalin

Krairiksh

2011

Int J RF and Microwave Comp Aid Eng

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Sectored antennas with wideband operation for wireless communication systems are presented. The proposed configurations are based on a coplanar waveguide fed slot antenna using metallic strip loadings and a widened tuning stub above various reflector shapes. By shaping the reflector, noticeable enhancements in both unidirectional radiation pattern and beamwidth can be achieved while maintaining the simple fabrication and installation. Based on the results obtained, three sector antennas covering 72 , 90 , and 120 beamwidths suitable for five, four, and three sectors, respectively, have been proposed and designed. The simple structural configurations, low cost, and ease of half power beamwidth control of the proposed antennas make the design very attractive for practical implementation.

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Design and Realization of a Flat-Top Shaped-Beam Antenna Array

Cited by 23 publications

References 6 publications

Large-Scale Sequentially-Fed Array Antenna Radiating Flat-Top Beam for Microwave Power Transmission to Drones

Large-Scale Sequentially-Fed Array Antenna Radiating Flat-Top Beam for Microwave Power Transmission to Drones

Synthesis of a Dual-Band Flat-Top Pattern Using Polarization Dependent Metasurface

Wideband constant beamwidth coplanar waveguide-fed slot antennas using metallic strip loadings and a widened tuning stub with shaped reflectors

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