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K.-M. Huang
College of Electronics and Information Engineering, Sichuan University, Chengdu, 610064, China

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Research article
Published: 07 May 2021 in Microwave and Optical Technology Letters
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In this article, a novel lens antenna with wide beamwidth using three‐dimensional printing is proposed. The proposed antenna is comprised of a concave lens by using three‐dimensional printing, a lantern shaped patch with a parasitic ring, and eight loaded monopoles around the center. The antenna operating frequency is 5.8 GHz, and the prototype is implemented. The measured half power beamwidth are 142° and 130° at the xoz and the yoz planes, respectively. Besides, the antenna is low cost, easy to fabricated, and very low cross polarization. Measured results agree well with the simulation results.

ACS Style

Tao Wang; Kama Huang; Bing Zhang; Wenbo Liu; Zhuoyue Zhang; Jing Hou; Nouman Rasool. A novel lens antenna with wide beamwidth using three dimensional printing. Microwave and Optical Technology Letters 2021, 63, 2192 -2198.

AMA Style

Tao Wang, Kama Huang, Bing Zhang, Wenbo Liu, Zhuoyue Zhang, Jing Hou, Nouman Rasool. A novel lens antenna with wide beamwidth using three dimensional printing. Microwave and Optical Technology Letters. 2021; 63 (8):2192-2198.

Chicago/Turabian Style

Tao Wang; Kama Huang; Bing Zhang; Wenbo Liu; Zhuoyue Zhang; Jing Hou; Nouman Rasool. 2021. "A novel lens antenna with wide beamwidth using three dimensional printing." Microwave and Optical Technology Letters 63, no. 8: 2192-2198.

Journal article
Published: 06 May 2021 in Journal of Environmental Management
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Plasma technology is increasingly being used for the degradation of residual antibiotics in aquatic environments. However, the electrodes in conventional plasma generators are subject to erosion, which can pollute the reaction system and shorten its lifetime. To overcome these drawbacks, we developed an electrodeless high-flow atmospheric microwave plasma jet (MPJ) for fast and efficient degradation of residual norfloxacin (NOR), a typical fluoroquinolone antibiotic that is frequently detected in the aquatic environment owing to its widespread use in the treatment of various infectious diseases. Stable plasma was generated through a low-cost magnetron with the assistance of injection-locking technology. The degradation efficiency of NOR (20 mg/L) reached 98.27 ± 1.03% at 6 min and the mineralisation efficiency reached 68.67 ± 3.21% at 15 min. The fast degradation process of the NOR solution contributes to the large cross-section (approximately 153 mm2) of the plasma in direct contact with the solution. Hydroxyl radical (•OH) scavengers were used to identify the generated oxidising species, which indicated that their non-selective oxidation plays a major role in NOR degradation. Three main possible degradation pathways and mechanisms were proposed, namely the attack of •OH on the piperazine ring, quinolone ring, and benzene ring. The NOR solution was not toxic to Escherichia coli after 20 min of degradation. Thus, the high-flow atmospheric MPJ is an effective technology for the degradation of antibiotics in aqueous solutions.

ACS Style

Li Xue; Chaoxia Zhao; Qi Mo; Yanping Zhou; Kama Huang. An electrodeless atmospheric microwave plasma jet for efficient degradation of antibiotic norfloxacin. Journal of Environmental Management 2021, 291, 112729 .

AMA Style

Li Xue, Chaoxia Zhao, Qi Mo, Yanping Zhou, Kama Huang. An electrodeless atmospheric microwave plasma jet for efficient degradation of antibiotic norfloxacin. Journal of Environmental Management. 2021; 291 ():112729.

Chicago/Turabian Style

Li Xue; Chaoxia Zhao; Qi Mo; Yanping Zhou; Kama Huang. 2021. "An electrodeless atmospheric microwave plasma jet for efficient degradation of antibiotic norfloxacin." Journal of Environmental Management 291, no. : 112729.

Journal article
Published: 18 March 2021 in Chemical Physics Letters
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To improve microwave heating efficiency, a combined experimental and simulated investigation of incoherent microwaves heating of water was carried out. The experiment was conducted with Separated Field Reconstructed equipment, which can provide incoherent microwaves generated from two independent sources. Both the experimental and simulated results indicated that, with same total powers, the heating rate of water under the irradiation of two incoherent microwaves was increased than that of one microwave. The enhancement can be understood qualitatively that the more discrepant electric field directions of incoherent microwaves would stimulate more molecular collisions, which would result in a higher heating rate.

ACS Style

Hongxiao Shi; Kama Huang; Yi Zhang; Ying Liu; Dezhi Gou. Incoherent microwaves heating of water: A combined experimental and simulated investigation. Chemical Physics Letters 2021, 771, 138528 .

AMA Style

Hongxiao Shi, Kama Huang, Yi Zhang, Ying Liu, Dezhi Gou. Incoherent microwaves heating of water: A combined experimental and simulated investigation. Chemical Physics Letters. 2021; 771 ():138528.

Chicago/Turabian Style

Hongxiao Shi; Kama Huang; Yi Zhang; Ying Liu; Dezhi Gou. 2021. "Incoherent microwaves heating of water: A combined experimental and simulated investigation." Chemical Physics Letters 771, no. : 138528.

Research article
Published: 04 March 2021 in International Journal of RF and Microwave Computer-Aided Engineering
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Lens is an effective antenna solution, the radiation pattern of the antenna can be enhanced through the dielectric lens, the lens antennas tend to be directive rather than omnidirectional that is. However, in this article, a monopole antenna integrated within a three dimensional printing mushroom shape lens and pasted the copper foil on the part of the surface of lens is proposed for wireless electromagnetic energy harvesting system at 5.8 GHz to the realization of a wide beam antenna. The bandwidth is from 5.33 to 6.07 GHz with the reflection coefficient below −10 dB. The half power beamwidth is 197° in x‐z plane and 175° in y‐z plane, respectively. And the peak gain is 2.47 dBi. Simulation results agree well with measured results.

ACS Style

Tao Wang; Kama Huang; Wenbo Liu; Zhuoyue Zhang; Jing Hou. A novel mushroom lens antenna with wide beam using three dimensional printing. International Journal of RF and Microwave Computer-Aided Engineering 2021, 31, e22609 .

AMA Style

Tao Wang, Kama Huang, Wenbo Liu, Zhuoyue Zhang, Jing Hou. A novel mushroom lens antenna with wide beam using three dimensional printing. International Journal of RF and Microwave Computer-Aided Engineering. 2021; 31 (5):e22609.

Chicago/Turabian Style

Tao Wang; Kama Huang; Wenbo Liu; Zhuoyue Zhang; Jing Hou. 2021. "A novel mushroom lens antenna with wide beam using three dimensional printing." International Journal of RF and Microwave Computer-Aided Engineering 31, no. 5: e22609.

Journal article
Published: 08 February 2021 in IEEE Transactions on Microwave Theory and Techniques
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Microwave wireless power transmission (MWPT) via radio waves has been an important research topic of the WPT systems, where the overall power transfer and conversion efficiency is a key factor to evaluate the system performance. The state-of-the-art work on MWPT has only taken the end-to-end power transfer efficiency in free space or the power conversion efficiency of the receiver (rectenna) into consideration separately when optimizing the power transfer efficiency of the overall system. To comprehensively consider the system-level matching of the entire MWPT system, a novel space matching concept, including aperture field matching, power matching, and impedance matching, is proposed for optimizing the overall power transfer efficiency. By using the space matching method in this work, the optimal designs of the subsystem components such as the transmitting antenna, receiving antenna, and rectifying circuit can be separately obtained to avoid the complex systematic optimization of the large-scale and complicated MWPT system, therefore, significantly improving the overall power transfer efficiency by 19.4% compared with the traditional methods, and reducing the complexity in large-scale system-level design. This work will have valuable implications in the system design of MWPT applications.

ACS Style

Ping Lu; Kama Huang; Yang Yang; Bing Zhang; Fei Cheng; Chaoyun Song. Space Matching for Highly Efficient Microwave Wireless Power Transmission Systems: Theory, Prototype, and Experiments. IEEE Transactions on Microwave Theory and Techniques 2021, 69, 1985 -1998.

AMA Style

Ping Lu, Kama Huang, Yang Yang, Bing Zhang, Fei Cheng, Chaoyun Song. Space Matching for Highly Efficient Microwave Wireless Power Transmission Systems: Theory, Prototype, and Experiments. IEEE Transactions on Microwave Theory and Techniques. 2021; 69 (3):1985-1998.

Chicago/Turabian Style

Ping Lu; Kama Huang; Yang Yang; Bing Zhang; Fei Cheng; Chaoyun Song. 2021. "Space Matching for Highly Efficient Microwave Wireless Power Transmission Systems: Theory, Prototype, and Experiments." IEEE Transactions on Microwave Theory and Techniques 69, no. 3: 1985-1998.

Journal article
Published: 04 February 2021 in Chemical Physics
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The slight electrical conductivity variations of sodium chloride aqueous solutions under the microwave field have been found in experiment, but the mechanism is still unclear. By applying molecular dynamics simulations, the number of water molecules in the hydration shells of sodium are examined quantitatively, we demonstrate that the outer water molecules of shell are stripped away due to the oscillations and collisions among water molecules under the microwave field, this is a microwave desolvation effect. By further study on calculating diffusion coefficient of ions, the electrical conductivity of solutions has been estimated. The result showed that as the diffusion coefficient increased by the desolvation effect, the electrical conductivity of solutions slightly enhanced. The electrical conductivity of solutions at different temperatures and concentrations agree with the measured results in the experiment.

ACS Style

Ying Liu; Kama Huang; Dezhi Gou; Hongxiao Shi. Electrical conductivity variations of aqueous NaCl solutions with microwave field: A molecular dynamics study. Chemical Physics 2021, 545, 111134 .

AMA Style

Ying Liu, Kama Huang, Dezhi Gou, Hongxiao Shi. Electrical conductivity variations of aqueous NaCl solutions with microwave field: A molecular dynamics study. Chemical Physics. 2021; 545 ():111134.

Chicago/Turabian Style

Ying Liu; Kama Huang; Dezhi Gou; Hongxiao Shi. 2021. "Electrical conductivity variations of aqueous NaCl solutions with microwave field: A molecular dynamics study." Chemical Physics 545, no. : 111134.

Journal article
Published: 04 November 2020 in Journal of Hazardous Materials
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Plasma technology has received intensive research interest in pollutants degradation. However, conventional plasma generator suffers from erosion of electrodes and consequent short life time and pollution. In this work, an electrodeless high-flow microwave atmospheric plasma jet is developed for fast degradation of p-nitrophenol. With the assistance of injection locking technology, stable plasma is managed to be generated by low-cost magnetron. 100% removal of 100 mg/L PNP is achieved after 12 min, with a TOC removal efficiency of 57.6%. The fast degradation is probably due to the high cross section (around 153 mm2) of plasma gas. Change in the removal efficiency are less than 4% and 5% as the pH of the solution changes from 2.02 to 12.07 and conductivity varies between 5.38 × 10−2 and 43.6 mS/cm, respectively. Moreover, optical emission spectroscopy spectra of the microwave plasma and a hydroxyl radical scavenger (t-butanol) are employed to identify the generated oxidizing species, which indicates that •OH is the key factor during the degradation process. The hydroxylated intermediates and organic acid transformed from PNP were revealed. Based on the examined intermediate products, the possible degradation mechanism and pathway are analyzed.

ACS Style

Chaoxia Zhao; Li Xue; Yanping Zhou; Yi Zhang; Kama Huang. A microwave atmospheric plasma strategy for fast and efficient degradation of aqueous p-nitrophenol. Journal of Hazardous Materials 2020, 409, 124473 .

AMA Style

Chaoxia Zhao, Li Xue, Yanping Zhou, Yi Zhang, Kama Huang. A microwave atmospheric plasma strategy for fast and efficient degradation of aqueous p-nitrophenol. Journal of Hazardous Materials. 2020; 409 ():124473.

Chicago/Turabian Style

Chaoxia Zhao; Li Xue; Yanping Zhou; Yi Zhang; Kama Huang. 2020. "A microwave atmospheric plasma strategy for fast and efficient degradation of aqueous p-nitrophenol." Journal of Hazardous Materials 409, no. : 124473.

Journal article
Published: 23 October 2020 in IEEE Transactions on Microwave Theory and Techniques
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The nonreciprocal bandpass filter has been achieved by utilizing the nonreciprocity characteristics of the magnetostatic surface wave (MSSW) in planar ferrite slabs. In this article, the dispersion relation, impedance, and attenuation of MSSW between the pure and metallized ferrite slabs have been analyzed and compared. Theoretical analysis indicates that the ferrite slab metallized by a thin conductive layer would introduce significant attenuation on the metallized interface, which is MSSW propagating on the isolated direction, while MSSW on the other surface is barely affected. Therefore, nonreciprocal bandpass filter with enhanced isolation can be achieved with metallized ferrite slab. Simulated S-parameters show that a notch in the isolating direction can be obtained at the passing band of the transmitting direction. Experimental results show that the nonreciprocal filter with metallized yttrium iron garnet (YIG) slab (by depositing 100-nm copper film) exhibits more than 10-dB higher isolation than that with pure YIG slab, while the center frequency, insertion loss, and 3-dB bandwidth maintain almost the same. The center frequency of the filter with metallized YIG slab can be tuned from 7.26 to 8.38 GHz with insertion loss of less than 3 dB, and in-band isolation of more than 30 dB as the dc bias magnetic field is increased from 1.8 to 2.3 kOe. Besides, the nonreciprocal filter has ultra-wide out-band suppression since it utilizes the narrow frequency band of MSSW. The -10-dB out-band rejection exceeds 36 GHz in the upper band and 1 MHz in the lower band.

ACS Style

Yi Zhang; Danli Cai; Chaoxia Zhao; Mingmin Zhu; Yuan Gao; Yunpeng Chen; Xianfeng Liang; Huaihao Chen; Jiawei Wang; Yuyi Wei; Yifan He; Cunzheng Dong; Neville Sun; Mohsen Zaeimbashi; Yang Yang; Huacheng Zhu; Bing Zhang; Kama Huang; Nian X. Sun. Nonreciprocal Isolating Bandpass Filter With Enhanced Isolation Using Metallized Ferrite. IEEE Transactions on Microwave Theory and Techniques 2020, 68, 5307 -5316.

AMA Style

Yi Zhang, Danli Cai, Chaoxia Zhao, Mingmin Zhu, Yuan Gao, Yunpeng Chen, Xianfeng Liang, Huaihao Chen, Jiawei Wang, Yuyi Wei, Yifan He, Cunzheng Dong, Neville Sun, Mohsen Zaeimbashi, Yang Yang, Huacheng Zhu, Bing Zhang, Kama Huang, Nian X. Sun. Nonreciprocal Isolating Bandpass Filter With Enhanced Isolation Using Metallized Ferrite. IEEE Transactions on Microwave Theory and Techniques. 2020; 68 (12):5307-5316.

Chicago/Turabian Style

Yi Zhang; Danli Cai; Chaoxia Zhao; Mingmin Zhu; Yuan Gao; Yunpeng Chen; Xianfeng Liang; Huaihao Chen; Jiawei Wang; Yuyi Wei; Yifan He; Cunzheng Dong; Neville Sun; Mohsen Zaeimbashi; Yang Yang; Huacheng Zhu; Bing Zhang; Kama Huang; Nian X. Sun. 2020. "Nonreciprocal Isolating Bandpass Filter With Enhanced Isolation Using Metallized Ferrite." IEEE Transactions on Microwave Theory and Techniques 68, no. 12: 5307-5316.

Journal article
Published: 16 October 2020 in IEEE Microwave and Wireless Components Letters
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In this letter, a compact broadband high-efficiency RF rectifier is presented for ambient RF energy harvesting (EH). A novel impedance matching network with an additional quarter-wavelength short-circuited stub was designed to achieve broadband impedance matching. After the branch was added, the parallel resonance point on track S₁₁ did not move, and the remaining points were compressed. The measurement results show that the proposed topology could realize a broadband high-efficiency rectifier for ambient RF EH, and the measured results were basically consistent with the simulation results. The measured efficiency is as high as 71.5% for an input power level of 8 dBm. A 1-2.4 GHz wide frequency band with an efficiency above 50% is achieved for an input power level of 5 dBm with a terminal load of 1.6 kΩ . Moreover, the circuit had wide dynamic input power characteristics, whose measured values remained above 50% with an input power of 3-14 dBm.

ACS Style

Wenbo Liu; Kama Huang; Tao Wang; Zhuoyue Zhang; Jing Hou. A Broadband High-Efficiency RF Rectifier for Ambient RF Energy Harvesting. IEEE Microwave and Wireless Components Letters 2020, 30, 1185 -1188.

AMA Style

Wenbo Liu, Kama Huang, Tao Wang, Zhuoyue Zhang, Jing Hou. A Broadband High-Efficiency RF Rectifier for Ambient RF Energy Harvesting. IEEE Microwave and Wireless Components Letters. 2020; 30 (12):1185-1188.

Chicago/Turabian Style

Wenbo Liu; Kama Huang; Tao Wang; Zhuoyue Zhang; Jing Hou. 2020. "A Broadband High-Efficiency RF Rectifier for Ambient RF Energy Harvesting." IEEE Microwave and Wireless Components Letters 30, no. 12: 1185-1188.

Journal article
Published: 01 October 2020 in IEEE Transactions on Antennas and Propagation
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A multi-polarization rectenna, consisting of a twoport antenna fed by an orthogonal hybrid coupler and a medium power rectifying circuit, is proposed. The orthogonal hybrid coupler has realized good isolation (S12 or S21 < -15 dB) between the two ports, which can be respectively connected to rectifying circuit and/or communication device for simultaneous wireless information and power transfer (SWIPT). Due to the symmetry of the coupler, the proposed rectenna can work at multipolarization modes, i.e. the circular polarization for the singleport operation and the linear polarization for the dual-port operation. Besides, a medium-power rectifying circuit is proposed, where its maximum radio-frequency (RF)-to-direct current (DC) power conversion efficiencies is 53.6% (simulated) and 51.1% (experimental) at the input power of 0 dBm and 0.5 dBm, respectively. By using the coupler, the conversion efficiency and impedance matching of the rectenna can be significantly improved. In addition, the power division between the two ports is considered at different modes. Compared to other rectennas, the proposed multi-functional rectenna has merits of multiple polarizations and multi-mode, which can therefore be used for the incoming waves in arbitrary polarization for SWIPT and cope with the uncertainty in realworld communication environments.

ACS Style

Ping Lu; Chaoyun Song; Ka Ma Huang. A Two-Port Multipolarization Rectenna With Orthogonal Hybrid Coupler for Simultaneous Wireless Information and Power Transfer (SWIPT). IEEE Transactions on Antennas and Propagation 2020, 68, 6893 -6905.

AMA Style

Ping Lu, Chaoyun Song, Ka Ma Huang. A Two-Port Multipolarization Rectenna With Orthogonal Hybrid Coupler for Simultaneous Wireless Information and Power Transfer (SWIPT). IEEE Transactions on Antennas and Propagation. 2020; 68 (10):6893-6905.

Chicago/Turabian Style

Ping Lu; Chaoyun Song; Ka Ma Huang. 2020. "A Two-Port Multipolarization Rectenna With Orthogonal Hybrid Coupler for Simultaneous Wireless Information and Power Transfer (SWIPT)." IEEE Transactions on Antennas and Propagation 68, no. 10: 6893-6905.

Journal article
Published: 01 October 2020 in IEEE Microwave and Wireless Components Letters
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This letter presents a high isolation substrate integrated waveguide (SIW) diplexer using dual-mode resonators. Each dual-mode SIW resonator can generate one transmission pole (TP) and one transmission zero (TZ) for the channel filter. The frequencies of the TZs can be easily controlled by the perturbation vias. One channel filter's two TZs' frequencies are designed to cover the other channel filter's passband. Thus, high isolation performance is achieved. The proposed diplexer is designed and fabricated with lower and upper channels centered at 8.04 and 9.07 GHz, respectively. Simulated and measured results are in good agreement for the two channels with better than 49/53-dB channel isolation.

ACS Style

Fei Cheng; Chao Gu; Bing Zhang; Yang Yang; Kama Huang. High Isolation Substrate Integrated Waveguide Diplexer With Flexible Transmission Zeros. IEEE Microwave and Wireless Components Letters 2020, 30, 1029 -1032.

AMA Style

Fei Cheng, Chao Gu, Bing Zhang, Yang Yang, Kama Huang. High Isolation Substrate Integrated Waveguide Diplexer With Flexible Transmission Zeros. IEEE Microwave and Wireless Components Letters. 2020; 30 (11):1029-1032.

Chicago/Turabian Style

Fei Cheng; Chao Gu; Bing Zhang; Yang Yang; Kama Huang. 2020. "High Isolation Substrate Integrated Waveguide Diplexer With Flexible Transmission Zeros." IEEE Microwave and Wireless Components Letters 30, no. 11: 1029-1032.

Article
Published: 08 September 2020 in Physical Review E
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This Rapid Communication reports on the observation of an interesting phenomenon: the shape, especially the length, of a microwave plasma jet (MPJ) can be clearly influenced by simply placing a conductor near the plasma source, particularly when the nearby conductor is in contact with the external conductor of the coaxial microwave plasma generator, accompanied by a significant change in microwave reflection power from the terminal. To further investigate this discovery, the relationships between the length of the plume and some important factors, such as the conductivity and length of the nearby conductor, microwave input power, and gas flow velocity, are analyzed, and we find nonlinear rules of influence of these factors on the jet. Measurements of the electric potential around the jet reveal the nonuniform and non-neutral charge distribution inside the visible plasma plume, which plays a vital role in uncovering the mechanism underlying this phenomenon. The results are helpful for providing a deeper understanding of microwave plasma jet characteristics. More importantly, it provides guidelines to control the MPJ using simple structures.

ACS Style

Yutian Yu; Kama Huang; Li Wu. Influence of a nearby conductor on shape and length of a microwave plasma jet. Physical Review E 2020, 102, 031201 .

AMA Style

Yutian Yu, Kama Huang, Li Wu. Influence of a nearby conductor on shape and length of a microwave plasma jet. Physical Review E. 2020; 102 (3):031201.

Chicago/Turabian Style

Yutian Yu; Kama Huang; Li Wu. 2020. "Influence of a nearby conductor on shape and length of a microwave plasma jet." Physical Review E 102, no. 3: 031201.

Journal article
Published: 04 September 2020 in Chemical Physics
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The microwave non-thermal effect is still a controversial issue. Here, the influence of weak microwaves on the spatial collision and energy distribution of water molecules is studied by the molecular dynamics simulation. The results show that the polarization of microwaves makes the change of spatial collision and energy distribution. The spatial collision probability of water molecules increases obviously in the direction of electric field and the proportion of high energy molecules decreases while the proportion of intermediate energy molecules increases. This shows the constrains of microwave fields on the water molecules, and these consequences would be helpful to understanding the microwave non-thermal effect and the mechanism of microwaves accelerating chemical reactions.

ACS Style

Dezhi Gou; Kama Huang; Ying Liu; Hongxiao Shi. Influence of weak microwaves on spatial collision and energy distribution of water molecules. Chemical Physics 2020, 540, 110977 .

AMA Style

Dezhi Gou, Kama Huang, Ying Liu, Hongxiao Shi. Influence of weak microwaves on spatial collision and energy distribution of water molecules. Chemical Physics. 2020; 540 ():110977.

Chicago/Turabian Style

Dezhi Gou; Kama Huang; Ying Liu; Hongxiao Shi. 2020. "Influence of weak microwaves on spatial collision and energy distribution of water molecules." Chemical Physics 540, no. : 110977.

Journal article
Published: 01 July 2020 in IEEE Microwave and Wireless Components Letters
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ACS Style

Lei Shi; Nouman Rasool; Huacheng Zhu; Kama Huang; Yang Yang. Design and Experiment of a Reconfigurable Magnetic Resonance Coupling Wireless Power Transmission System. IEEE Microwave and Wireless Components Letters 2020, 30, 705 -708.

AMA Style

Lei Shi, Nouman Rasool, Huacheng Zhu, Kama Huang, Yang Yang. Design and Experiment of a Reconfigurable Magnetic Resonance Coupling Wireless Power Transmission System. IEEE Microwave and Wireless Components Letters. 2020; 30 (7):705-708.

Chicago/Turabian Style

Lei Shi; Nouman Rasool; Huacheng Zhu; Kama Huang; Yang Yang. 2020. "Design and Experiment of a Reconfigurable Magnetic Resonance Coupling Wireless Power Transmission System." IEEE Microwave and Wireless Components Letters 30, no. 7: 705-708.

Journal article
Published: 24 June 2020 in IEEE Transactions on Microwave Theory and Techniques
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Microwave selective/localized heating has been widely used in special areas, e.g., medical treatment and food processing, but the control of selective/localized heating in restricted space, e.g., microwave ovens, is difficult to accomplish. In this article, a Giuseppe Peano fractal phased-array antenna is designed, and the phase of each radiator is derived to achieve the arbitrary spatial division of the electromagnetic field in a cavity based on the superposition principle of waves. Then, a multiphysics model of microwave heating is established by coupling the electromagnetic field and heat transfer to simulate the directional control of microwave heating in a cavity. An experimental system is built, and the heating results are measured using an infrared thermal imager to verify the temperature distribution in different spatial regions. Finally, the feasibility of the model for different heating targets is discussed.

ACS Style

Yang Yang; Zhipeng Fan; Tao Hong; Maoshun Chen; Xiangwei Tang; Jianbo He; Xing Chen; Changjun Liu; Huacheng Zhu; Kama Huang. Design of Microwave Directional Heating System Based on Phased-Array Antenna. IEEE Transactions on Microwave Theory and Techniques 2020, 68, 4896 -4904.

AMA Style

Yang Yang, Zhipeng Fan, Tao Hong, Maoshun Chen, Xiangwei Tang, Jianbo He, Xing Chen, Changjun Liu, Huacheng Zhu, Kama Huang. Design of Microwave Directional Heating System Based on Phased-Array Antenna. IEEE Transactions on Microwave Theory and Techniques. 2020; 68 (11):4896-4904.

Chicago/Turabian Style

Yang Yang; Zhipeng Fan; Tao Hong; Maoshun Chen; Xiangwei Tang; Jianbo He; Xing Chen; Changjun Liu; Huacheng Zhu; Kama Huang. 2020. "Design of Microwave Directional Heating System Based on Phased-Array Antenna." IEEE Transactions on Microwave Theory and Techniques 68, no. 11: 4896-4904.

Editorial
Published: 23 April 2020 in Processes
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Microwave heating has been widely used in the chemical industry because of its advantages, such as fast heating rate, selective and controllable heating, increasing reaction rate and reducing by-products in chemical reactions. The Special Issue contains research on microwave applications in chemical engineering.

ACS Style

Huacheng Zhu; Kama Huang; Junwu Tao. Special Issue on “Microwave Applications in Chemical Engineering”. Processes 2020, 8, 491 .

AMA Style

Huacheng Zhu, Kama Huang, Junwu Tao. Special Issue on “Microwave Applications in Chemical Engineering”. Processes. 2020; 8 (4):491.

Chicago/Turabian Style

Huacheng Zhu; Kama Huang; Junwu Tao. 2020. "Special Issue on “Microwave Applications in Chemical Engineering”." Processes 8, no. 4: 491.

Journal article
Published: 18 March 2020 in Physics of Plasmas
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A high efficiency of power coupling from the incident microwave to the discharge is a general demand for large-scale and high-power applications of microwave plasma torches. This paper aims to experimentally explore the possibility of improving the power coupling efficiency by choosing a proper glass tube in a microwave plasma torch with a metallic enclosure, rather than using additional tuning measures such as a movable short-circuited ending plunger or a three-stub tuner. The power coupling efficiencies for the glass tubes with different wall thicknesses were experimentally measured under different incident microwave powers and different pressures. The results showed that the power coupling efficiency was improved with the increase in the glass tube wall thickness in a wide range of operating conditions for the microwave plasma torch with specific dimensions. An efficiency higher than 85% can be achieved once the wall thickness of the glass tube is in a particular range. This indicates that external tuning measures can be reduced for the microwave plasma torch with a proper glass tube, which helps to save the cost of tuning devices and enhance the flexibility in different working environments.A high efficiency of power coupling from the incident microwave to the discharge is a general demand for large-scale and high-power applications of microwave plasma torches. This paper aims to experimentally explore the possibility of improving the power coupling efficiency by choosing a proper glass tube in a microwave plasma torch with a metallic enclosure, rather than using additional tuning measures such as a movable short-circuited ending plunger or a three-stub tuner. The power coupling efficiencies for the glass tubes with different wall thicknesses were experimentally measured under different incident microwave powers and different pressures. The results showed that the power coupling efficiency was improved with the increase in the glass tube wall thickness in a wide range of operating conditions for the microwave plasma torch with specific dimensions. An efficiency higher than 85% can be achieved once the wall thickness of the glass tube is in a particular range. This indicates that external tun...

ACS Style

Wencong Zhang; Li Wu; Zhuang Liu; Junwu Tao; Kama Huang. Experimental investigation on improving the efficiency of power coupling from the incident microwave to the discharge in a plasma torch. Physics of Plasmas 2020, 27, 033510 .

AMA Style

Wencong Zhang, Li Wu, Zhuang Liu, Junwu Tao, Kama Huang. Experimental investigation on improving the efficiency of power coupling from the incident microwave to the discharge in a plasma torch. Physics of Plasmas. 2020; 27 (3):033510.

Chicago/Turabian Style

Wencong Zhang; Li Wu; Zhuang Liu; Junwu Tao; Kama Huang. 2020. "Experimental investigation on improving the efficiency of power coupling from the incident microwave to the discharge in a plasma torch." Physics of Plasmas 27, no. 3: 033510.

Journal article
Published: 22 January 2020 in IEEE Transactions on Power Electronics
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A self-biased adaptive reconfigurable rectenna, consisting of a microstrip patch antenna and a self-biased reconfigurable rectifying circuit, is proposed. To eliminate the need of bias networks, a DC power routing structure is introduced to link the reconfigurable matching stub and the load. Hence the output DC current obtained by the rectifier can be divided/split, thereby letting a part of the DC current flow back to the matching stub for providing a bias voltage. According to the input power level, the states of the PIN switch can be automatically changed in order to connect/disconnect the matching stub to the rectifying circuit for achieving improved matching performance at different power levels. Simulated and measured results show that the proposed rectenna reaches more than 50% conversion efficiency over a broadened input power range from 0~20 dBm with the peak efficiency of 68% at 9 dBm. It is evident that the proposed self-biased reconfigurable matching scheme is a promising and effective solution to facilitate the less-complicated reconfigurable rectenna integration and realize high efficiency at higher operating frequency bands (e.g. > 5 GHz).

ACS Style

Ping Lu; Chaoyun Song; Fei Cheng; Bing Zhang; Ka Ma Huang. A Self-Biased Adaptive Reconfigurable Rectenna for Microwave Power Transmission. IEEE Transactions on Power Electronics 2020, 35, 7749 -7754.

AMA Style

Ping Lu, Chaoyun Song, Fei Cheng, Bing Zhang, Ka Ma Huang. A Self-Biased Adaptive Reconfigurable Rectenna for Microwave Power Transmission. IEEE Transactions on Power Electronics. 2020; 35 (8):7749-7754.

Chicago/Turabian Style

Ping Lu; Chaoyun Song; Fei Cheng; Bing Zhang; Ka Ma Huang. 2020. "A Self-Biased Adaptive Reconfigurable Rectenna for Microwave Power Transmission." IEEE Transactions on Power Electronics 35, no. 8: 7749-7754.

Journal article
Published: 01 January 2020 in IEEE Transactions on Power Electronics
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A compact rectenna with a wide input power range is proposed for wireless power transfer (WPT). Two different diodes, having distinct operating powers, i.e. high-input-power diode and low-input-power diode, are introduced to the rectenna design for extending the operating input power range. A mid-inductor is placed in the rectifying circuit to isolate the radio frequency (RF) signal from DC power, thereby delivering the rectified DC power to the load. Also, with the aid of mid-inductor, the fundamental RF signal and harmonic signals could flow back to the two rectifying diodes for achieving higher conversion efficiency via the means of harmonic signal re-rectification. Owing to the mid-inductor, the sub-rectifier circuit can be avoided, and a compact structure can therefore be realized. Over 50% measured conversion efficiency ${\eta_{c}}$ can be achieved in a very wide input power range of 35 dB (-10 to 25 dBm). The proposed rectenna can be widely used in WPT systems with unpredictable and variable RF energy levels.

ACS Style

Ping Lu; Chaoyun Song; Ka Ma Huang. A Compact Rectenna Design With Wide Input Power Range for Wireless Power Transfer. IEEE Transactions on Power Electronics 2020, 35, 6705 -6710.

AMA Style

Ping Lu, Chaoyun Song, Ka Ma Huang. A Compact Rectenna Design With Wide Input Power Range for Wireless Power Transfer. IEEE Transactions on Power Electronics. 2020; 35 (7):6705-6710.

Chicago/Turabian Style

Ping Lu; Chaoyun Song; Ka Ma Huang. 2020. "A Compact Rectenna Design With Wide Input Power Range for Wireless Power Transfer." IEEE Transactions on Power Electronics 35, no. 7: 6705-6710.

Journal article
Published: 29 October 2019 in IEEE Antennas and Wireless Propagation Letters
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ACS Style

Bing Zhang; Li Wu; Yanping Zhou; Yang Yang; Huacheng Zhu; Fei Cheng; Qian Chen; Kama Huang. A K-Band 3-D Printed Focal-Shifted Two-Dimensional Beam-Scanning Lens Antenna With Nonuniform Feed. IEEE Antennas and Wireless Propagation Letters 2019, 18, 2721 -2725.

AMA Style

Bing Zhang, Li Wu, Yanping Zhou, Yang Yang, Huacheng Zhu, Fei Cheng, Qian Chen, Kama Huang. A K-Band 3-D Printed Focal-Shifted Two-Dimensional Beam-Scanning Lens Antenna With Nonuniform Feed. IEEE Antennas and Wireless Propagation Letters. 2019; 18 (12):2721-2725.

Chicago/Turabian Style

Bing Zhang; Li Wu; Yanping Zhou; Yang Yang; Huacheng Zhu; Fei Cheng; Qian Chen; Kama Huang. 2019. "A K-Band 3-D Printed Focal-Shifted Two-Dimensional Beam-Scanning Lens Antenna With Nonuniform Feed." IEEE Antennas and Wireless Propagation Letters 18, no. 12: 2721-2725.