Article
Engineering, Electrical & Electronic
Zhentian Wu, Ming-Chun Tang, Ting Shi, Richard W. Ziolkowski
Summary: The antenna features a dual-circularly polarized design with a multilayer stacked layout, radiating left-hand or right-hand CP fields at 1.5 GHz, and exhibits electrical smallness and low profile characteristics, with high port isolation.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
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
Wei Lin, Richard W. Ziolkowski
Summary: The rectenna system integrates an efficient rectifier circuit and an ultra-thin electrically small antenna on the same substrate, with large electromagnetic wave capturing capability and high dc conversion efficiency. The system is low-cost, easy to fabricate, and suitable for ultra-compact far-field wireless power transfer applications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
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
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
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
Muhammad Saqib Rabbani, James Churm, Alexandros P. Feresidis
Summary: A novel antenna beam-steering technology for emerging millimeter-wave (mm-wave), broadband mobile technologies was proposed in this study. The test results of a high-gain (23 dBi) antenna with 30 degrees beam steering at the 38 GHz band demonstrated low loss, fast and continuous beam steering. The use of Fabry-Perot type leaky-wave antenna (LWA) and tunable high-impedance surface (HIS) showed great potential for future mm-wave communication systems.
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
Mohammad Hossein Gandomi, Davoud Zarifi
Summary: This article discusses the design and development of supershaped monocone and rotationally symmetric monopole antennas, utilizing supercurves and superformula to optimize parameters for bandwidth and radiation pattern requirements. The proposed designs exhibit excellent performance in ultra-wideband antennas and the use of supercurves simplifies computational complexity.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Computer Science, Information Systems
Kang Ding, Yanjie Wu, Kun-Hua Wen, Duo-Long Wu, Jian-Feng Li
Summary: This paper investigates a stacked circular polarization (CP) patch antenna design with broad impedance bandwidth, axial-ratio (AR) bandwidth, and flat gains. By introducing a new structure, the design achieves advantages of wide bandwidth, compact size, and flat gain compared to other similar CP stacked patch antennas.
Article
Engineering, Electrical & Electronic
Zhentian Wu, Ming-Chun Tang, Richard W. Ziolkowski
Summary: This article presents an electrically small, low-profile Huygens dipole filtenna that operates near 1.28 GHz. The design incorporates magnetic and electric near-field resonant parasitic elements for enhanced out-of-band rejection. Experimental results demonstrate good agreement with simulation and validate the performance of the proposed filtenna.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Lauryn P. Smith, James C. Howell, Sungkyun Lim
Summary: In this study, a size-reduced 15-element Yagi antenna implemented in a planar shape with T-shaped top loadings achieved a 45% reduction in element lengths compared to a traditional lambda/2 full-sized Yagi antenna. The proposed antenna showed a similar bandwidth and realized gain compared to the full-sized Yagi antenna. Additionally, a minor difference in realized gain was observed when more than two parasitic elements were added, with approximately 0.2 dB contribution per added element. The measurements and simulations were in good agreement.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
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
Engineering, Electrical & Electronic
Rasmus Luomaniemi, Pasi Yla-Oijala, Anu Lehtovuori, Ville Viikari
Summary: This article studies the use of quality factor Q for designing multiport antenna structures with matching networks and presents approximative formulas for computing the Q-factor. The research shows that the achievable performance level of multiport antennas can be reliably estimated based on the Q-factor without the need for computationally heavy matching network optimization, providing an efficient tool to accelerate the design process.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Cagatay Tokgoz, Babajide A. Salau, Manthan A. Shah
Summary: In this study, the authors propose a method to predict the radiation of a monopole antenna array on an electrically large conducting convex surface using the uniform geometrical theory of diffraction (UTD) solution. Results show that this method can effectively predict radiation characteristics when the source point is on or slightly off the surface, and the results are consistent with those of other methods.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Ting Shi, Ruolei Chai, Xiaoming Chen, Mei Li, Tao Zhang, Ming-Chun Tang
Summary: A low-profile circularly polarized metasurface-based antenna with enhanced axial-ratio bandwidth and stable high gain is developed in this study. The antenna consists of a stacked layout with a metasurface containing 3 x 3 patch lattices placed above a custom-designed driven element. The driven element, composed of a patch with an etched slot and a parasitic ring strip with shorting pins, excites the metasurface to generate multiple resonances and three axial ratio minimum points, resulting in enhanced axial-ratio bandwidth and stable high gain. Experimental and simulated results show that the antenna achieves a low profile and achieves a 20.48% fractional bandwidth and 10.2% axial-ratio bandwidth.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Yaqing Yu, Dingmou Hong, Ming-Chun Tang, Da Yi, Mei Li
Summary: A compact near-field resonant parasitic (NFRP) slot helix antenna with wide axial ratio bandwidth is developed. The antenna consists of a hemispherical-metallic surface (HMC) with dual curved helical slots and a driven helical monopole. The dual-slot NFRP helix antenna has a wider working bandwidth and is suitable for aerospace and mobile communication systems.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
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
Yaqing Yu, Zhiyang Qi, Da Yi, Ming-Chun Tang, Richard W. Ziolkowski
Summary: We developed an electrically small, epidermal RFID tag that can monitor human body temperature reliably at a distance. This tag is based on Huygens dipole antenna technology, which offers unidirectional radiation and circular polarization for enhanced read distance and reduced polarization loss. The CP HDA is seamlessly integrated with a commercial temperature sensor to minimize insertion loss and overall size. Simulation results show that the antenna has a ka value of 0.52 and a gain of 2.32 dBic at 915 MHz. A complete RFID system was assembled to validate the tag's performance, which achieved stable body temperature monitoring with a resolution of 0.25 degrees C and a maximum read distance of 170 cm, surpassing commercial dipole-based products by over 14 times.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Shaode Huang, Chao-Fu Wang, Ming-Chun Tang
Summary: Characteristic mode analysis (CMA) is a popular tool for analyzing radiation and scattering problems, but conventional full-structure characteristic modes (CMs) have limitations in identifying desired modal solutions for certain antenna problems. To address this drawback and expand the application of CMA, a generalized surface integral equation (SIE)-based sub-structure CM formulation is proposed for composite objects with arbitrary metallic-dielectric combinations. The sub-structure CMs accurately capture resonant modes belonging to the main radiator in the presence of passive loading, providing flexible and useful modal solutions for antenna problems with desired resonant modes confined to designated regions.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Kun-Zhi Hu, Bao-Cang Guo, Shuai-Yu Pan, Dong Yan, Ming-Chun Tang, Ping Wang
Summary: This brief presents a low-profile single-layer half-mode substrate integrated waveguide (HMSIW) filtering antenna with compact circuit size. The antenna features a simple structure, including a half-mode substrate integrated waveguide cavity (HMSIWC), a shorted parasitic patch, and a folded defected ground structure (DGS) etched into the metallized ground plane. The proposed antenna demonstrates good performance in terms of impedance bandwidth, gain response, and radiation nulls. The measured and simulated results are in good agreement, validating the effectiveness of the design.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Engineering, Aerospace
Jianing Yang, Yanting Zhang, Ming-Chun Tang, Zhehao Zhang, Meijun Qu
Summary: This paper presents a method to achieve a compact broadband low-RCS ReflectArray (RA) antenna using a Frequency Selective Surface (FSS) absorber and a reflective metasurface. The FSS absorber consists of a resistance-loaded lossy layer and an FSS layer to achieve absorption-transmission response. The bottom reflective metasurface acts as a phased array, transforming the quasi-spherical wave into a quasi-planar wave. Simulated and measured results of the low-RCS RA antenna show an aperture efficiency of 42.7%, a gain of 25.4 dBi in the X band, and a 10 dB RCS reduction for orthogonal polarizations at the S and C bands with a fractal bandwidth of 120%. The use of a patch-feeding antenna makes the RA antenna more compact and the design is cost-effective and easy to fabricate.
CHINESE JOURNAL OF AERONAUTICS
(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, Electrical & Electronic
Kun-Zhi Hu, Hao-Yang Huang, Ming-Chun Tang, Zhiyuan Chen, Dong Yan, Ping Wang
Summary: This paper proposes a single-layer, wideband, differential-fed filtering antenna with high selectivity. The antenna consists of a square patch, a square substrate integrated waveguide (SIW) cavity, a pair of symbiotic stepped impedance resonators (SSIRs), and a pair of complementary split ring resonators (CSRRs). By merging the TM10 mode of the square patch with the TE210 mode in the SIW cavity through differential excitation, the impedance bandwidth can be broadened. The SSIRs and CSRRs further improve the frequency selectivity and rejection levels. A prototype has been fabricated and tested, showing good performance with a large fractional impedance bandwidth, peak realized gain, and high selectivity.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Yunlu Duan, Ming-Chun Tang, Zhentian Wu, Zhehao Zhang, Da Yi, Mei Li
Summary: This paper presents an omnidirectional, vertically polarized, wideband, electrically small near-field resonant parasitic filtenna. By developing a specially engineered tridimensional inverted-F structure as the driven element, a new NFRP VP antenna with a smaller size and wider fractional bandwidth (FBW), as well as a radiation null in the low frequency band edge, is formed. The FBW is further expanded and a radiation null in the upper frequency band edge is introduced by etching a pair of C-shaped slots on the NFRP element. The collaboration of the upper and lower radiation nulls enables the antenna to have excellent band-pass filtering property.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Physics, Applied
Jianing Yang, Yanting Zhang, Ming-Chun Tang, Yijia Huang, Xin Xie
Summary: A broadband reconfigurable metasurface with perpendicular metallic gratings and a PIN diode-driven split circular ring has been demonstrated for polarization and propagation modes control. The designed metasurface possesses tunable properties in two propagation modes. It can convert incident linear-polarized waves into transmitted cross-polarized waves with full transmission in the OFF state and reflect incident linear-polarized waves into co-polarized waves with full reflection in the ON state. The proposed reconfigurable metasurface shows tunable transmission, reflection, and polarization properties from 4.9 to 7 GHz.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Mei Li, Chun-Li Zhang, Ming-Chun Tang, Lei Zhu
Summary: This paper presents and analyzes a compact, single-layer, dual-frequency patch antenna with large beamwidth diversity, providing broad beamwidth in the lower frequency and high-gain radiation in the higher frequency. The antenna consists of a square driven patch and two T-shaped top-loaded monopoles loaded beside the two radiating edges of the driven patch. The analysis shows that even with a frequency ratio as small as 1.02, consistent broad beamwidth and high-gain radiation pattern can be maintained at the lower and higher frequencies. Additionally, the antenna retains the simple geometry and high efficiency of a typical patch antenna. A prototype is fabricated and measured to verify the simulated radiation results.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2023)
Article
Optics
Hai Xin, Jianing Yang, Ming-Chun Tang, Haochen Zhang, Zuojun Zhang, Meijun Qu
Summary: This paper presents a broadband, electrically controlled, reconfigurable, circularly polarized reflective metasurface. The chirality of the metasurface is changed by switching active elements, which is achieved through the tunable current distributions generated by an elaborately designed structure under x-polarized and y-polarized waves. The proposed metasurface unit cell demonstrates a good circular-polarization efficiency in a broad range of 6.82-9.96 GHz (37% fractional bandwidth) with a phase difference of pi between the two states. A simulation and measurement of a reconfigurable circularly polarized metasurface containing 8 x 8 elements was conducted, showing that the proposed metasurface can flexibly control circularly polarized waves and achieve beam splitting, mirror reflection, and other beam manipulations from 7.4 GHz to 9.9 GHz (28.9% fractional bandwidth) by adjusting the loaded active elements. The reconfigurable metasurface proposed in this study holds promise for electromagnetic wave manipulation or communication systems.
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)
