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Search Results (5)

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Keywords = microwave power transmission (MPT)

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17 pages, 7047 KiB  
Article
Ultra-Wideband High-Power GaN Rectifier with Extended Input Power Range Based on a Terminal Matching Network
by Shudong Huo, Huining Liu, Kui Dang, Yuxuan Cui, Xianghao Min, Zhilin Qiu, Yachao Zhang, Hong Zhou, Jing Ning, Jincheng Zhang and Yue Hao
Electronics 2025, 14(1), 184; https://doi.org/10.3390/electronics14010184 - 4 Jan 2025
Cited by 1 | Viewed by 1184
Abstract
This paper proposes a terminal matching network (TMN) technology, which can realize wideband matching of microwave rectifiers in a wide input power range. At the same time, it is proposed to realize ultra-wideband microwave rectifiers by connecting two TMN branches of different frequencies [...] Read more.
This paper proposes a terminal matching network (TMN) technology, which can realize wideband matching of microwave rectifiers in a wide input power range. At the same time, it is proposed to realize ultra-wideband microwave rectifiers by connecting two TMN branches of different frequencies in parallel. In order to verify this theory, two rectifiers using single TMN and dual TMN branches are designed and realized based on high-power GaN Schottky barrier diodes (SBDs). The single TMN GaN rectifier achieves a peak efficiency of 72.3% and a conversion efficiency of more than 70% in the frequency range of 1.8–2.7 GHz at 1 W of input power, while being more than 50% efficient in the input power range of 16–35 dBm. Benefitting from the power combination of different frequency TMNs, the dual TMNs GaN rectifier achieves 75.8% peak efficiency and over 70% conversion efficiency at 1.1–3.1 GHz frequency and 1 W input power with a relative bandwidth over 95.2% and maintains high efficiency of over 50% in the input power range of 15–35 dBm. The advantages of the ultra-wideband, wide input power range, high power, and high efficiency make the GaN rectifier with TMNs expected to play an important role in microwave power transmission (MPT). Full article
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13 pages, 3026 KiB  
Article
A Novel 10-Watt-Level High-Power Microwave Rectifier with an Inverse Class-F Harmonic Network for Microwave Power Transmission
by Jing Peng, Shouhao Wang, Xiaoning Li and Ke Wang
Electronics 2024, 13(18), 3705; https://doi.org/10.3390/electronics13183705 - 18 Sep 2024
Cited by 2 | Viewed by 1165
Abstract
A novel 10-Watt-Level high-power microwave rectifier with an inverse Class-F harmonic network for microwave power transmission (MPT) is presented in this paper. The high-power microwave rectifier circuit comprises four sub-rectifier circuits, a 1 × 4 power divider, and a parallel-series dc synthesis network. [...] Read more.
A novel 10-Watt-Level high-power microwave rectifier with an inverse Class-F harmonic network for microwave power transmission (MPT) is presented in this paper. The high-power microwave rectifier circuit comprises four sub-rectifier circuits, a 1 × 4 power divider, and a parallel-series dc synthesis network. The simple inverse Class-F harmonic control network serves dual roles: harmonic control and impedance matching. The 1 × 4 power divider increases the RF input power fourfold, reaching 40 dBm (10 W). The parallel-series dc synthesis network enhances the resistance to load variation. The high-power rectifier circuit is simulated, fabricated, and measured. The measurement results demonstrate that the rectifier circuit can reach a maximum RF input power of 10 W at 2.45 GHz, with a maximum rectifier efficiency of 61.1% and an output dc voltage of 23.9 V, which has a large application potential in MPT. Full article
(This article belongs to the Special Issue Advanced RF/Microwave Circuits and System for New Applications)
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17 pages, 2072 KiB  
Article
Design of Series-Fed Circularly Polarized Beam-Tilted Antenna for Microwave Power Transmission in UAV Application
by Mok Yoon Park, Jun Hee Kim, Sang-hwa Yi, Wonseob Lim, Youngoo Yang and Keum Cheol Hwang
Appl. Sci. 2024, 14(8), 3490; https://doi.org/10.3390/app14083490 - 20 Apr 2024
Viewed by 2142
Abstract
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Multi-Band/Broadband Antenna Design, Optimization and Measurement)
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8 pages, 6351 KiB  
Article
A Substrate Integrated Waveguide-Based W-Band Antenna for Microwave Power Transmission
by Liang Liu, Yu Yang, Chuan Yu, Shifeng Li, Hao Wu, Limin Sun and Fanbao Meng
Micromachines 2022, 13(7), 986; https://doi.org/10.3390/mi13070986 - 24 Jun 2022
Cited by 7 | Viewed by 2278
Abstract
A W-band slot array antenna based on a substrate integrated waveguide (SIW) for microwave power transmission (MPT) is proposed in this paper. By size optimization, the transition from the rectifier element to the antenna is limited to a small size. It realizes a [...] Read more.
A W-band slot array antenna based on a substrate integrated waveguide (SIW) for microwave power transmission (MPT) is proposed in this paper. By size optimization, the transition from the rectifier element to the antenna is limited to a small size. It realizes a compact arrangement of the radiating slots, which not only improves the aperture efficiency of the antenna but also makes it easy to integrate into a large-scale array. For antenna testing, a coplanar waveguide–SIW–rectangular waveguide transition structure is added at the end of the antenna, and an antenna with this transition structure is processed by PCB printing technology and measured. The measured reflection coefficient is less than −10 dB at 90–96 GHz, the aperture efficiency is greater than 60% at 93.5–94.5 GHz, the maximum gain is 13.2 dB at 93.5 GHz, and the aperture efficiency is 79%. The test results of the antenna show that the antenna has a good performance and can be applied to the MPT system as a rectenna. Full article
(This article belongs to the Special Issue Microwave Passive Components)
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14 pages, 18571 KiB  
Article
A Study on Automatically Target-Chasing Microwave Power Transfer Systems in Multipath Environments
by Naoki Shinohara and Taichi Sasaki
Energies 2022, 15(7), 2343; https://doi.org/10.3390/en15072343 - 23 Mar 2022
Cited by 3 | Viewed by 2604
Abstract
In this paper, we propose novel retrodirective systems to improve the efficiency and safety of microwave power transmission (MPT) systems in multipath environments. The retrodirective system consists of an array antenna with phased conjugation circuits and it sends back the phase-conjugate signal toward [...] Read more.
In this paper, we propose novel retrodirective systems to improve the efficiency and safety of microwave power transmission (MPT) systems in multipath environments. The retrodirective system consists of an array antenna with phased conjugation circuits and it sends back the phase-conjugate signal toward the pilot signal transmitted from the receiver. It is usually applied for one receiver MPT system, however, Ossia corp. develops the new retrodirective system in multipath environments named ‘Cota’. We simulated the detail of the Cota system, e.g., one receiver in multipath circumstance, one receiver with obstacle in the multipath circumstance, and multi receiver. Furthermore, we revised the retrodirective system with phase information as well as the amplitude information of the pilot signal to improve the MPT efficiency. We also find effect of the MPT efficiency by phase difference between two pilot signal sources. At last, we carried out the experiments of the retrodirective system in multipath circumstance to prove the simulation results. Full article
(This article belongs to the Special Issue Next Generation Wireless Charging System for Mobile Devices)
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