- 标题
- 摘要
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- 实验方案
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A Compact Wideband High-Gain Metasurface-Lens-Corrected Conical Horn Antenna
摘要： In this paper, a compact wideband high-gain metasurface-lens-corrected conical horn (meta-horn) antenna is developed. A metasurface lens that has a thickness of less than 0.1λ is developed to provide wideband transmission phase compensation, with high transmission efficiency. The ultra-thin lens is then used to develop a wideband high-gain horn antenna that has a shorter horn length and a large flare angle, resulting in a compact horn structure that is easy to be fabricated and mounted, and at a low cost. Simulations and experiments were conducted to demonstrate the effectiveness of the design. Measured results show that the meta-horn has a peak gain of 24.2 dBi and a 3-dB gain bandwidth of over 26%.
关键词： horn antenna,flare angle,metasurface lens,high-gain
更新于2025-09-19 17:15:36
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Highly Flexible and Voltage Based Wavelength Tunable Biosensor
摘要： A plasmonic absorber as a biosensor based on the highly flexible electro-optic material is numerically investigated. The structure demonstrates multispectral high absorption in visible and unity absorption in the near-infrared range. The resonant wavelengths are extremely sensitive to the applied voltage, variation in geometric parameters, and the refractive index of the background material, resulting in wavelength-tunable absorption that can be used for tunable sensors and filters. The refractive index based sensitivity is calculated on different voltages to adjust the resonances to the desired point in a wide waveband for detecting a large number of different biomaterials. The electro-optic tunability can be used to reduce fabrication errors and use of scaling. In addition, strong field absorption, broad resonant peaks, and wide incident angle absorption versatility are found in the proposed structure which can be applied for energy harvesting, infra-red detection, and surface-enhanced Raman spectroscopy purposes.
关键词： electro-optic,plasmonics,detection,photonics,nanosystems,metasurface
更新于2025-09-19 17:15:36
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[IEEE 2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting - Boston, MA, USA (2018.7.8-2018.7.13)] 2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting - Computational Millimeter-wave Spotlight Imaging using Holographic Metasurface Antennas
摘要： In this paper, a spotlight imaging system integrated with a frequency-diverse aperture is presented for security-screening applications. The spotlight imager consists of holographic metasurface antennas that can dynamically be tuned to radiate spotlight patterns allowing the extraction of high-resolution images from a constrained field-of-view (FOV). The spotlight aperture operates at a single frequency, 75 GHz, within the W-band frequency regime (75 – 110 GHz) and is used for the identification of threat objects while the frequency-diverse aperture operates at K-band frequencies (17.5 – 26.5 GHz) and is used for detection purposes, determining the constrained FOV to be imaged using the spotlight imager at high resolution.
关键词： spotlight,metamaterial,metasurface,millimeter-wave,microwaves,imaging,focusing
更新于2025-09-19 17:15:36
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Synthesis of Spherical Metasurfaces based on Susceptibility Tensor GSTCs
摘要： The bianisotropic susceptibility Generalized Sheet Transition Conditions (GSTCs) synthesis method is extended from planar to spherical metasurfaces. Properties specific to the non-zero intrinsic curvature of the spherical shape are pointed out and different types of spherical transformations are described. Finally, the susceptibility-GSTC method and exotic properties of spherical metasurfaces are validated and illustrated with three examples: illusion transformation, ring focusing and birefringence.
关键词： Spherical metasurface,Generalized Sheet Transition Conditions (GSTCs),electromagnetic transformations,bianisotropic susceptibilities,synthesis
更新于2025-09-19 17:15:36
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[IEEE 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Auckland (2018.8.5-2018.8.8)] 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - A Miniaturized Double-Vivaldi Antenna With Improved Gain Based on a Novel Metasurface
摘要： A miniaturized double-Vivaldi antenna (DVA) with high gain based on metasurface (MS) is proposed. A pair of defected ground slots (DGS) are added to the edges of the antenna to extend the low-end frequency limitation from 2.15 GHz to 1 GHz. Then, the gain of DVA is improved obviously in a wide frequency band by the inclusion of a MS in the aperture. The novel unit cell of the MS in our design is a two-stub-loaded split-ring resonator (TSLSRR), which has compact size, wide frequency band, and low-return loss. Finally, to verify the designed methods, DVA, DVA with DGS (DVA-DGS), DVA with DGS and MS (DVA-DGS-MS) ware successfully designed, and it show an overall size of 80 mm × 150 mm × 1 mm.
关键词： wideband and low-return loss metasurface,Double-Vivaldi antenna,high-gain,defected ground slot
更新于2025-09-19 17:15:36
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[IEEE 2018 Asia-Pacific Microwave Conference (APMC) - Kyoto, Japan (2018.11.6-2018.11.9)] 2018 Asia-Pacific Microwave Conference (APMC) - Reconfigurable Metasurface as Microwave Reflectors and Polarization Converters
摘要： An ultrathin metasurface is made reconfigurable through the use of unit cells incorporating voltage-controlled varactor diodes. The phase characteristics of each unit cell are individually controlled for reconfigurability mechanisms. Two main applications are proposed in the domain of microwave devices and antennas. The planar metasurface is illuminated by a primary source and is firstly used as reconfigurable reflector allowing beam steering performances and frequency agility. A second functionality is also demonstrated, where the metasurface is used as a reconfigurable polarizer. Measurements are performed on a fabricated prototype to validate the concept.
关键词： frequency agility,reconfigurable reflector,polarizer,antennas,planar metasurface
更新于2025-09-19 17:15:36
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Metasurfaces for Advanced Sensing and Diagnostics
摘要： Interest in sensors and their applications is rapidly evolving, mainly driven by the huge demand of technologies whose ultimate purpose is to improve and enhance health and safety. Different electromagnetic technologies have been recently used and achieved good performances. Despite the plethora of literature, limitations are still present: limited response control, narrow bandwidth, and large dimensions. MetaSurfaces, artificial 2D materials with peculiar electromagnetic properties, can help to overcome such issues. In this paper, a generic tool to model, design, and manufacture MetaSurface sensors is developed. First, their properties are evaluated in terms of impedance and constitutive parameters. Then, they are linked to the structure physical dimensions. Finally, the proposed method is applied to realize devices for advanced sensing and medical diagnostic applications: glucose measurements, cancer stage detection, water content recognition, and blood oxygen level analysis. The proposed method paves a new way to realize sensors and control their properties at will. Most importantly, it has great potential to be used for many other practical applications, beyond sensing and diagnostics.
关键词： MetaSurface,sensors,cancer detection,modeling,medical diagnostics,glucose measurements,design
更新于2025-09-19 17:15:36
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High-gain polarization conversion metasurface
摘要： A novel analytical method based on the cavity mode theory to design a metasurface (MS) is proposed in this study. We carefully analyzed the phase and amplitude characteristics of the incident wave and transmitted wave, and successfully designed a circular polarization conversion MS by introducing a cutting structure with wider operation bandwidth and higher radiation direction gain compared with that of the original MS. For the measurements, a microstrip antenna operating at 2.4 GHz was used as the source antenna to verify the designed MS. The simulation and measurement results agree well with each other.
关键词： metasurface,amplitude adjustment,phase adjustment,polarization conversion
更新于2025-09-19 17:15:36
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Gain enhancement and RCS reduction of CP patch antenna using partially reflecting and absorbing metasurface
摘要： This paper presents a novel partially reflecting and absorbing metasurface (PRAM) in order to reduce Radar Cross Section (RCS) and enhance the gain of the circularly polarized patch antenna. The unit cell of PRAM consists of two stacked substrates with metallic patterns, which is used to design absorbing surface (AS) and partial reflecting surface (PRS). The metallic pattern on the top of the two substrates acts as AS and absorbs most of the out of band incoming wave. The bottom surface of the PRAM is used as PRS to construct Fabry-Perot (F-P) resonance cavity with metamaterial ground plane (MGP) for gain enhancement. Simulated and measured results show that the peak gain of the proposed antenna is enhanced by 5.7 dB at 6.6 GHz. The results also show that the impedance bandwidth and 3-dB axial ratio bandwidth of the antenna are also improved by the employment of PRAM. Monostatic RCS of the proposed antenna is significantly reduced in the broad range of 7 to 18 GHz and proposed antenna achieves maximum RCS reduction of 15.6 dB at 14.3 GHz.
关键词： Gain enhancement,circular polarization,partially reflecting and absorbing metasurface (PRAM),radar cross section (RCS)
更新于2025-09-19 17:15:36
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Optimal High Efficiency 3D Plasmonic Metasurface Elements Revealed by Lazy Ants
摘要： Recent transmissive optical metamaterials that leverage a generalized form of Snell’s law to induce anomalous refraction of light have garnered considerable interest in both optical and materials communities. However, most of these designs have primarily centered around parametric studies of planar canonical structures for their low profile and relative ease of manufacturing. In many of these cases, all-dielectric designs are preferred over metallodielectrics due to their low loss characteristics. Moreover, considering modern advances in nanofabrication techniques, these canonical structures represent only a small portion of the design space that is explorable. In this work, we exploit a generalized Multi-Objective Lazy Ant Colony Optimization (MOLACO) algorithm and a modified Pareto locus search mechanism to optimize arbitrary three-dimensional meta-material unit cells in the optical regime based on the Membrane Projection Lithography technique. Our exploration has revealed unintuitive metallodielectric structures for phase-gradient metasurface applications in the mid-wave infrared (MWIR) regime that achieve transmission magnitudes comparable to the highest-performance all-dielectric designs found in the literature. As a proof-of-concept, a beam-steering metasurface is synthesized using these unintuitive unit cell geometries and is shown to achieve over 84% diffraction efficiency which is among the highest performing metallodielectric metasurfaces in the MWIR reported to date.
关键词： Three-Dimensional,Metallo-dielectric,Metasurface,Optimization,Inverse-Design
更新于2025-09-19 17:13:59