Article
Engineering, Electrical & Electronic
Nathan Strachen, Elham Mohammadi, John Booske, Nader Behdad
Summary: This study presents the design and experimental demonstration of an active electrically small antenna capable of transmission over the entire HF band. The antenna consists of a 2-m long dipole integrated with a class-AB push-pull amplifier. Experimental results show stable, ultra-wideband operation and total efficiency improvements of over 15 dB compared to passive matching scenarios.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Alexander J. Angilella, Nichole K. Davis, Ian T. McMichael
Summary: This study explores the use of piezocomposite materials for impedance matching in electrically small strain antennas and proposes a methodology for achieving impedance matching without the need for an external network. The study also reveals that the radiation resistance of piezoelectric strain antennas is much smaller than that of similarly sized electric dipole antennas.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Ming-Chun Tang, Piao Guo, Dajiang Li, Kun-Zhi Hu, Mei Li, Richard W. Ziolkowski
Summary: This paper presents the design of vertically polarized, omnidirectional- and endfire-radiating, bandwidth-enhanced, high-efficiency electrically small monopole filtennas. The performance of the filtennas is achieved by combining a coax-fed top-hat loaded monopole with two hybrid quarter-wavelength open-end stubs and a shorting post. The measured results confirm the efficacy of both filtenna designs.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Edward Slevin, Morris B. Cohen, Nathan Opalinski, Lee Thompson, Mark Golkowski
Summary: This article introduces a new approach to transmitting broadband signals from electrically small antennas, overcoming the limitations of traditional antennas. The proposed technique allows for a wider operational bandwidth and is particularly useful for generating very-low-frequency/low-frequency waves, suitable for long-range and underwater communication.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Marwan Jadid, Christophe Delaveaud, Serge Bories, Anthony Bellion
Summary: This letter presents a small antenna radiation efficiency measurement method based on the antenna quality factor. It modifies the original Q factor method by considering the loss Q factor of the antenna instead of the radiation Q factor. The method is verified for two types of antennas operating at different frequencies, and it shows high accuracy compared to the conventional Wheeler cap method.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Xiaoming Chen, Ming-Chun Tang, Dajiang Li, Mei Li
Summary: This paper presents the design and optimization of a flexible, bandwidth-enhanced, electrically small, electric near-field resonant parasitic (NFRP) filtering antenna. By adjusting the relative position of the NFRP element and the driven dipole, the antenna achieves excellent bandpass-filtering response and enhanced bandwidth. Experimental results confirm the stable performance of the antenna under different bending conditions.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Zhentian Wu, Ming-Chun Tang, Richard W. Ziolkowski
Summary: This article investigates an electrically small, planar, frequency-agile, beam-switchable Huygens dipole antenna, which utilizes varactor diodes to tune its operating frequency and switch its main beam direction for two independent endfire radiating states. The antenna demonstrates a 5% frequency-agile fractional impedance bandwidth in both states, with high radiation efficiency, peak realized gain, front-to-back ratio, and stable radiation patterns over the frequency-agile range.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Ming-Chun Tang, Qingli Lin, Mei Li, Richard W. Ziolkowski
Summary: The presented antenna is a specially designed system that can switch between four different polarization states, exhibiting very stable radiation performance.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Wei Gu, Kevin Luong, Zhi Yao, Han Cui, Yuanxun Ethan Wang
Summary: Utilizing ferromagnetic resonance of thin-film ferrites can improve the radiation efficiency and input impedance matching of electrically small antennas simultaneously. Experimental results of a prototype with a thin-film yttrium-iron-garnet (YIG) core match well with simulation results, demonstrating the efficacy and significance of this concept. Broadband equivalent circuit models are effective in predicting the input impedance and radiation efficiency of FMR-enhanced ESAs at a precision comparable with full-wave simulations.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
B. L. G. Jonsson, Fabien Ferrero, Shuai Shi, Lei Wang
Summary: This research focuses on a small embedded planar antenna in a 25 cm(2) square-shaped terminal, aiming to demonstrate how the Q-factor bounds can be utilized to predict the antenna's performance, to determine the optimal bandwidth and efficiency variations, and to inspire antenna design by considering the impact of shape and position on both bandwidth and efficiency.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Ben A. P. Nel, Anja K. Skrivervik, Mats Gustafsson
Summary: Antenna bounds are useful for assessing antenna design feasibility and performance. This article presents tight lower bounds on microstrip patch antennas with infinite dielectric substrate, which are significantly tighter than the Chu limit and introduce a new scaling rule. The bounds consider all possible geometries and show that well-known patch antennas have near-optimal bandwidth. The computation of the bounds is done using a method of moments (MoM) formulation, and an approximation using commonly available simulation tools is provided.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Ruiyang Li, Gao Wei
Summary: A unidirectional planar electrically small antenna shape synthesis method is proposed using characteristic mode concepts, allowing for easy selection of antenna feed on the synthesized conductor and potentially achieving high-directivity designs.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Computer Science, Information Systems
Ayman A. Althuwayb, Mohammad Alibakhshikenari, Bal S. Virdee, Francisco Falcone, Ernesto Limiti
Summary: The paper presents a method to improve the bandwidth, radiation gain, and efficiency of an electrically small antenna using a negative impedance converter. By replacing the inductive load, significant enhancements in performance were achieved for the H-shaped antenna.
Article
Physics, Applied
Yuan Li, He Ma, Yu Wang, Jun Ding, Limei Qi, Yulan Fu, Ran Ning, Lu Rong, Dayong Wang, Xinping Zhang
Summary: With the growing need for broadband wireless communication, high-resolution radar, security inspection, and biological analysis, terahertz (THz) technology has made significant progress in recent years. This progress has been possible due to the development of various THz functional devices, with metasurface being widely applied in these devices. However, constructing flexible THz metasurface devices remains a challenge due to the lack of flexibility in traditional semiconductor and metal materials. In this study, a two-dimensional material called MXene was used to create flexible metasurfaces with frequency filtering and polarization functions. These metasurfaces, combined with vanadium dioxide, showed excellent amplitude modulation performance under electrical stimulation. The flexibility and high integration of this active metasurface make it useful in THz imaging and sensing systems.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Analytical
Di Shi, Taimur Aftab, Gunnar Gidion, Fatma Sayed, Leonhard M. Reindl
Summary: This work proposes an electrically small patch antenna with a low-cost high-permittivity ceramic substrate material for use in a ground-penetrating radar. The antenna is optimized to operate around 1.3 GHz with continuous 3 dB bandwidth, improving the -3 and -6 dB fractional bandwidth by 1.8 times and 4 times, respectively. It is designed to be installed on an unmanned aerial vehicle (UAV) for quick search for survivors after earthquakes or gas explosions.
Article
Multidisciplinary Sciences
Liujun Xu, Jinrong Liu, Peng Jin, Guoqiang Xu, Jiaxin Li, Xiaoping Ouyang, Ying Li, Cheng-Wei Qiu, Jiping Huang
Summary: The curved space-time produced by black holes leads to the intriguing trapping effect. So far, metadevices have enabled analogous black holes to trap light or sound in laboratory spacetime. However, trapping heat in a conductive environment is still challenging because diffusive behaviors are directionless.
NATIONAL SCIENCE REVIEW
(2023)
Article
Thermodynamics
Binzhen Zhou, Jianjian Hu, Peng Jin, Ke Sun, Ye Li, Dezhi Ning
Summary: By studying a hybrid system consisting of a semi-submersible platform and heaving point absorber wave energy converters (WECs), this research has found that a new prominent power peak occurs in the so-called synchronized mode regardless of the layout of the WECs. In this mode, the power of a single WEC can increase by up to 41.4% and the total power by up to 26.7%, but the heave motion of the platform increases. The WECs have a small impact on the surge motion and pitch motion of the platform except for near the synchronized mode frequency, where they reduce the resonant heave motion at the natural frequency. This study provides valuable insights into the dynamic and power performance of wind-wave hybrid systems, offering detailed configurations and potential guidance for practical design and application.
Article
Engineering, Electrical & Electronic
David A. A. Katzmarek, Yang Yang, Mohammad B. B. Ghasemian, Kourosh Kalantar-Zadeh, Richard W. W. Ziolkowski, Francesca Iacopi
Summary: The properties of epitaxial graphene for radio frequency (RF) applications are investigated. Metal coplanar waveguides (CPWs) are fabricated to evaluate the frequency-dependent behavior of the graphene's sheet resistance. The quality of the metal contact with graphene and the influence of small-scale discontinuities are important factors in the RF spectrum.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Wei Lin, Richard W. Ziolkowski
Summary: This paper presents an A-band Huygens antenna array with high aperture efficiency and low sidelobe levels, suitable for 5G millimeter-wave applications. The array consists of innovative Huygens subarrays formed by open rectangular waveguides. The full broadside-radiating array achieves an aperture efficiency up to 97.5% and sidelobe and backlobe levels less than -20 dB, with an impedance bandwidth of 26.7-29.65 GHz and a peak realized aperture efficiency of 82%. A prototype of the array was fabricated and tested, showing good agreement with simulation results.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Multidisciplinary Sciences
Peng Jin, Jinrong Liu, Liujun Xu, Jun Wang, Xiaoping Ouyang, Jian-Hua Jiang, Jiping Huang
Summary: Thermal metamaterials provide rich control of heat transport by breaking the Onsager reciprocity and introducing thermal convection, leading to a regime beyond effective heat conduction. A continuous switch from thermal cloaking to thermal concentration is demonstrated in a liquid-solid hybrid thermal metamaterial with external tuning. This switch is achieved by tuning the liquid flow, resulting in a topology transition in the virtual space of the thermotic transformation. These findings illustrate the extraordinary heat transport in complex multicomponent thermal metamaterials and pave the way toward an unprecedented regime of heat manipulation.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Engineering, Electrical & Electronic
Qingli Lin, Ming-Chun Tang, Mei Li, Richard W. Ziolkowski
Summary: This article reports the design of a wideband, circularly polarized electrically small antenna with two axial ratio poles. The design includes a specially engineered driven dipole, a resonant parasitic crossed Egyptian axe dipole, and an inductive grid-array metasurface. The measured results agree well with simulated ones, achieving a wide axial ratio bandwidth by pressing the two poles close together.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Chemical
Daoguang Teng, Peng Jin, Shiqiao Yang, Wenhuan Guo, Zhuang Zhao, Guoli Zhou, Peng Li, Yijun Cao
Summary: Cost-effective polycyclic aromatic hydrocarbons (PAHs) were used to fabricate hyper-cross-linked polymers (HCLPs) via an external cross-linker knitting method (ECLKM) followed by N-source impregnation modification. The resulting materials exhibited high thermal stability, large specific surface areas, narrow pore distributions, and high pore volumes. The effects of porosities and N-doping modification on the CO2 capture capacities of HCLPs were fully studied, and it was found that porosities played a dominant role in the CO2 uptake process compared to N-doping modification. This study provides a simple strategy for constructing HCLPs with excellent CO2 capture performances using PAHs.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Mechanics
Bin-zhen Zhou, Zhi Zheng, Yu Wang, Peng Jin, Lin Cui, Liang Cheng
Summary: An optimization method is proposed to determine the dimensions of a hybrid system consisting of a spar-type floating offshore wind turbine and a heaving annular wave energy converter (WEC). The synchronized mode, where the natural frequency of the system matches the peak wave frequency, is found to be the most effective in terms of wave energy production.
JOURNAL OF HYDRODYNAMICS
(2023)
Article
Physics, Applied
Fubao Yang, Peng Jin, Min Lei, Gaole Dai, Jun Wang, Jiping Huang
Summary: The proposed space-time-coding electromagnetic metasurface introduces the temporal dimension into artificial structure design, expanding its digital application in information processing. However, the absence of temporal dimension in thermal digital metamaterial limits the synergetic modulation of thermal signal in time and space. This study introduces temporal modulation into existing spatially variable thermal coding structures and proposes a space-time thermal binary coding scheme, demonstrating a practical strategy for thermal binary coding and providing a prototype for spatiotemporal regulation of thermal signal.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Multidisciplinary
Kai Wang, Feng Wan, Ling Luo, Pengyu Cao, Lei Han, Peng Jin
Summary: This paper investigates the buckling enhancement of the negative Poisson's ratio (NPR) effect on a laminated plate under uniaxial compression with an in-plane translational restraint. By studying the buckling equation and lamination parameters, it is found that the critical buckling load of an NPR-laminated composite can be increased due to the induced tension force on the unloaded direction under compression. The Poisson's ratio contours and buckling load enhancement are analyzed, and the inverse problem of deciding the laminate configuration is solved using the particle swarm optimization (PSO) algorithm.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Peng Jin, Liujun Xu, Guoqiang Xu, Jiaxin Li, Cheng-Wei Qiu, Jiping Huang
Summary: Heat-enhanced thermal diffusion metamaterials powered by deep learning enable automatic temperature sensing and adjustment with high tunability and stable thermal performance.
ADVANCED MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Richard W. Ziolkowski
Summary: There is a demand for highly directive antenna systems for space-limited Internet-of-Things devices and NextG applications. Compact high-frequency high-directivity alternatives to phased arrays are desired. This study presents the simulated performance characteristics of compact unidirectional mixed-multipole antennas (UMMAs) based on dipole and quadrupole mixtures, showing their high directivities and attractive radiation efficiencies.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Marine
Binzhen Zhou, Qi Zhang, Jianjian Hu, Peng Jin, Hengming Zhang, Siming Zheng
Summary: The wave power absorption of a heaving-body wave energy converter can be improved by deploying it near a coastal wall, harbour pier, or breakwater and making it highly asymmetric. This research proposes a semi-analytical model to analyze the coupling between the geometric asymmetry of the converter and the partial reflecting boundaries of the walls. Results show that the wall increases the power performance by increasing the reflection rate.
Article
Chemistry, Inorganic & Nuclear
Wangqiang Shen, Lei Lou, Yiao Wei, Lipiao Bao, Guangqing Xu, Peng Jin, Jun Lv, Xing Lu
Summary: In this study, a dysprosium-containing mono-EMF with a C-84 cage, possessing rare D-2(21) symmetry, was successfully synthesized. Theoretical calculations revealed that the encapsulation of a trivalent Dy ion in the carbon cage is energetically more favorable than other C-84-based mono-EMFs. This work not only expands the trivalent mono-EMF family but also provides insights into the unique structures and stabilities of such novel EMFs.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Review
Medicine, General & Internal
Peng Jin, Li-Li Sun, Bin-Xin Li, Mei Li, Wei Tian
Summary: This study explored the effect of high-quality nursing care (HQNC) on psychological disorders in patients with ovarian cancer (OC) during the perioperative period. The results showed that HQNC had a more promising effect on anxiety relief and depression decrease compared to routine nursing care.
