A novel high power frequency beam-steering antenna array for long-range wireless power transfer

Eid, Alla M.; Alieldin, Ahmed; El-Akhdar, Abdelrahman M.; El-Agamy, Ahmed F.; Saad, Walid; Salama, Amgad A.

doi:10.1016/j.aej.2021.01.007

Cited by 10 publications

(3 citation statements)

References 27 publications

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“…Therefore, some values of the weight vector may exceed 1 V/m. This can be, practically, accomplished by constructing a feeding network based on a combination of equal and unequal power dividers/combiners with precalculated power-division ratios to keep the SLL at its same value as shown in FIGURE 7 [15]. The main drawback of this configuration is that the antenna array loses its beam reconfigurability as once the feeding network is designed, the weight vector (wdis) is kept permanent and so is the SLL.…”

Section: A Power-loss Efficiency (ηPl)mentioning

confidence: 99%

Aperture Efficiency of Non-Uniform Antenna Arrays With Controlled Sidelobe Level

Alieldin,

Huang

2024

IEEE Open J. Antennas Propag.

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The non-uniform distribution of the weight vector of the elements in an antenna array has attracted much attention in order to obtain such as the desired beam pattern, null locations, and performance objectives. This topic has been of interest for many decades. Several mathematical models and optimization algorithms have been developed to achieve a controllable sidelobe level. However, few researchers have considered the effect of the non-uniform distribution on the aperture efficiency. This paper presents a comprehensive study and proposes accurate mathematical modelling of the aperture efficiency of an antenna array which is divided into two components: power-loss efficiency (which dominates total aperture efficiency) and power-distribution efficiency to gain a better understanding. The paper also shows how the sidelobe level of an antenna array is linked to these efficiencies and how they can be improved. It is proved that the aperture efficiency exponentially decays when lowering the sidelobe level. However, it converges to a certain value when the sidelobes vanish. Moreover, a validation example through simulations is presented to verify the mathematical modelling of the aperture efficiency.

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Section: A Power-loss Efficiency (ηPl)mentioning

confidence: 99%

Aperture Efficiency of Non-Uniform Antenna Arrays With Controlled Sidelobe Level

Alieldin,

Huang

2024

IEEE Open J. Antennas Propag.

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“…4) POWER HANDLING CAPABILITY The maximum handling power is calculated according to the square relationship between power and electric field intensity as [24] - [25]:…”

Section: ) Efficiency and Axial Ratiomentioning

confidence: 99%

A High-Power Sandwiched Omnidirectional Circularly Polarized Antenna for GNSS Systems

2023

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This paper presents a small-size, low-profile antenna for anti-attacking systems that work against unmanned GNSS-guided attacking vehicles to protect a vital area. The proposed antenna has the ability to handle, theoretically, a peak power up to 157.7 kW. It has a cylindrical shape with a diameter of 75.4 mm and a height of 12.8 mm on a low-cost FR-4 substrate. This small size allows the integration of the proposed antenna with any portable system that prevents the attacks of GNSS-guided vehicles. The proposed antenna covers the whole GNSS frequency band with a fractional impedance bandwidth of 32.5% (1.16-1.61) GHz and a fractional axial ratio bandwidth of 37.6% (1.1-1.61) GHz utilizing a sandwiched structure. This broadband performance is realized using capacitive feeding. The proposed design maintains circularly polarized radiation over a wide elevation angle of 132º and a 360º azimuth angle which makes the proposed design suitable for GNSS anti-attacking systems.

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“…Electronically passive beam steering, in contrast, is less expensive, offers a lower profile, and has a simpler design than its active counterpart, eliminating the need for additional electronics. In [20], the main lobe is steered from 60 • to 90 • without additional electronics, using a parallel feeding network to minimize sidelobe levels. The design in [21] features index-modulated tilted-beam microstrip antennas with a 50 • tilt and a 33.8% bandwidth enhancement.…”

Section: Introductionmentioning

confidence: 99%

Design of Series-Fed Circularly Polarized Beam-Tilted Antenna for Microwave Power Transmission in UAV Application

Park,

Kim,

et al. 2024

Applied Sciences

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In response to the increasing deployment of unmanned aerial vehicles (UAVs) across various sectors, the demand for efficient microwave power transmission (MPT) systems for UAVs has become paramount. This study introduces series-fed circularly polarized (CP) and passively beam-tilted patch array antennas designed to enhance MPT in UAV applications, with the intention of addressing the needs related to extending flight times and improving operational efficiency. The radiating element of the proposed antennas employs the conventional model of the patch with truncated corners for CP operation, with transmission line lengths optimized for beam tilt to ensure precise energy transfer. Additionally, an open stub is integrated into the broadside series-fed antenna to improve impedance matching, which is crucial for maintaining signal integrity. The proposed design achieves right-hand circular polarization (RHCP) with an axial ratio (AR) below 3 dB across the operating band, indicative of its effectiveness in diverse UAV operational contexts. Prototypes of each proposed antenna were fabricated and measured according to the beam tilting angle. The measured RHCP realized gains of the proposed antennas are 14.59, 13.09, 13.07, and 10.71 dBic at the tilted angles of 0∘, 15∘, 30∘, and 45∘, respectively, at 5.84 GHz.

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A novel high power frequency beam-steering antenna array for long-range wireless power transfer

Cited by 10 publications

References 27 publications

Aperture Efficiency of Non-Uniform Antenna Arrays With Controlled Sidelobe Level

Aperture Efficiency of Non-Uniform Antenna Arrays With Controlled Sidelobe Level

A High-Power Sandwiched Omnidirectional Circularly Polarized Antenna for GNSS Systems

Design of Series-Fed Circularly Polarized Beam-Tilted Antenna for Microwave Power Transmission in UAV Application

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