- 标题
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- 实验方案
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Tunable Wide-Bandwidth Resonators Based on Layered Gallium Sulfide
摘要： Wide-bandwidth and high-frequency operation are the two desired properties from resonators in a wide range of applications, such as communication devices, energy harvesters, inertial sensors, and electronic components. However, achieving both of these prerequisites along with detectable vibration amplitudes is very challenging. Herein, nano-electromechanical resonators based on layered gallium sulfide (GaS) are demonstrated. These resonators show resonance frequencies in the range of 10–25 MHz under ambient conditions and a bandwidth of hundreds of kilohertz, which can be simply tuned by predetermining the dimensions of the devices. Therefore, this study emphasizes that, in addition to excellent performances in electronic and optoelectronic applications, GaS can also be implemented as a high performance core element in nanoresonator applications.
关键词： electromechanical properties,wide-bandwidth resonators,gallium sulfide,2D materials
更新于2025-09-23 15:23:52
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Design of a Circularly Polarized Dielectric Resonator Antenna with Wide Bandwidth and Low Axial Ratio Values
摘要： A circularly polarized (CP) dielectric resonator antenna (DRA) with wide bandwidth and low axial ratio (AR) values is presented in this communication. The antenna consists of a stacked DRA, and it is fed by a substrate integrated waveguide (SIW) coupling slot from the bottom. The stacked DRA structure, with high permittivity dielectric strips layered on low permittivity substrate, is adopted for bandwidth and gain benefits. Here, a pair of dielectric strips rather than a single one is placed above the coupling slot with 45° inclination for generating good CP radiation, and it is elaborately designed to provide three closely coupled CP modes, constituting a wide operating bandwidth. To facilitate the application in antenna array, a cavity-backed antenna design along with a 2×2 sub-array are further presented. To verify the design, a sub-array prototype is developed and tested at Ku-band for satellite applications, showing an impedance bandwidth of 25.1%, a wide 1-dB AR bandwidth of 15.6%, and a peak gain of 15.1dBi.
关键词： substrate integrated waveguide,low axial ratio values,wide bandwidth,Dielectric resonator antenna
更新于2025-09-23 15:22:29
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A Wideband Dual-Slot Coupled Multiple Dense Dielectric Patch Antenna
摘要： A dual-slot coupled multiple dense dielectric (DD) patch antenna is proposed to achieve wide bandwidth. The multiple DD patches operating at quasi-TM11 mode and quasi-TM21 mode, which is excited by the dual-slot. In addition, the dual-slot also functions as an effective radiator as with DD patches. Thus, five modes including two modes of DD patches and three modes of the dual slots can be obtained to support wide bandwidth. Compared with the reported DD patch antennas, the proposed design exhibits wide bandwidth and relatively high gain with a finite ground size. For demonstration, one prototype operating at 8.98 GHz is fabricated with the ground size of 0.63 λ0 ×0.78 λ0 (λ0 is the wavelength in the free space at the center frequency), the 10-dB impedance matching bandwidth of 81.9% and the peak gain of 9.27 dBi.
关键词： multiple dense dielectric patch,Dual-slot coupled,wide bandwidth
更新于2025-09-23 15:21:01
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An ultra-wide range (0.01–240 Gbps) transmitter with latched AC-coupled driver and dummy data transient generator
摘要： This paper proposes an ultra-wide range transmitter with a latched AC-coupled driver (LACD) and a dummy data transient generator (DDTG). The LACD expands the low-frequency range by preventing the capacitor discharge issue of the high-speed AC-coupled driver and the DDTG enhances the high-frequency range by generating a dummy transient pattern to stabilize the power node ?uctuation induced by the dense and sparse pattern dependency in the case of coding-less application. A 24-channel test chip designed with 40-nm CMOS technology achieved an ultra-wide frequency range (0.01–10 Gbps/channel) and ultra-wide bandwidth from 0.01 Gbps (0.01 Gbps × 1 channel) to 240 Gbps (10 Gbs × 24 channels) and a high area e?ciency (0.0027 mm2/Gbps/channel). At the data rates of 5 and 10 Gbps, the jitters with DDTG were 50% lower than attained without DDTG.
关键词： ultra-wide frequency-range,ultra-wide bandwidth,latched AC-coupled driver,dummy data transient generator,transmitter,display interface
更新于2025-09-16 10:30:52
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Technical Specifications of the Submarine Fiber Optic Channel Bandwidth/Capacity in Optical Fiber Transmission Systems
摘要： This work outlines technical specifications of the undersea fiber optic communication channel bandwidth, capacity with taken into account the maximum and minimum extended fiber cost in the presence of amplifiers stations. The number of amplifiers in the amplification stage are addressed based on the amplifier distance to strength the light signal in water depth after 5 km distance. The fiber channel capacity is estimated at different water depth and at the surface of the water. Minimum input signal power and required detectable received power are adjusted to ensure the high data rates in submarine cable systems under the best and worst conditions of the seawater pressure. The study emphasizes the high data rates
关键词： wide bandwidth,technical specifications,water pressure,water depth
更新于2025-09-16 10:30:52
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Developer Design of Hybrid Plasmonic Nano Patch Antenna with Metal Insulator Metal Multilayer Construction
摘要： Hybrid plasmonic nanopatch antenna with metal-insulator-metal (HMIM) multilayer has been investigated for operation at the frequency of 125–250 THz using the finite element method (FEM) implemented in Ansoft High Frequency Structure Simulator (HFSS). The proposed antenna exhibits a wide bandwidth of 49.5 THz (151.5 THz–201 THz) for the slots thicknesses Wg = 50 nm and Ws = 100 nm and dual bandwidth for Ws = 20 nm. The obtained results show the input impedance of 50.3 Ω input resistance (real part) and 2.3 Ω reactance (imaginary part) occurring at (near) the operation frequency. The maximum gain of 23.98 dB has been observed for resonant frequencies of 176 THz, and the maximum directivity remains above 6.73 dB and 7.46 dB at resonant frequencies of 170 THz and 190 THz, respectively. Our proposed antenna performance is compared to previously reported designs. The copolar and cross-polar radiation patterns are simulated at different resonant frequencies of 160 THz and 197 THz for planes Φ = 90° and Φ = 0° . The arrays of a proposed antenna are designed in one and two dimensions in order to appropriate high-gain applications.
关键词： Ansoft High Frequency Structure Simulator,wide bandwidth,hybrid plasmonic nanopatch antenna,high-gain applications,metal-insulator-metal,finite element method
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall) - Honolulu, HI, USA (2019.9.22-2019.9.25)] 2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall) - Parasitic Slot Elements for Bandwidth Enhancement of Slotted Waveguide Antennas
摘要： The use of extra slots in a slotted waveguide array for improving the impedance bandwidth is investigated. This has not widely studied previously, probably because the directive pattern is a primary parameter for the waveguide array and extra elements are prone to spoiling the control of the pattern. However, the pattern is not a primary design parameter for most mobile terminals, and here we seek a wide bandwidth for a smaller antenna than the traditional waveguide array, which is suitable for a mobile terminal. The extra slots can be viewed as parasitic elements, analogously to free-space thin wire parasitic, but the designs are not interchangeable with wire antennas. This is because the waveguide - both the internal and external structure - constrains the excitation of the slot elements in a different way to that of the wire antenna analogies. Simple-to-build designs are sought where the slot elements are on only one of the waveguide broad walls. The approach is experimental (simulation) which allows rapid and accurate evaluation of different con?gurations. We do not optimize a con?guration because any optimal design will depend on the speci?c structure of the mobile terminal supporting the antenna. For the basic stand-alone waveguide, a -6dB impedance bandwidth of ～ 30% is demonstrated using four slot elements in a short waveguide.
关键词： wide bandwidth,Parasitic slot element,slotted waveguide antenna
更新于2025-09-12 10:27:22
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Tellurene Photodetector with High Gain and Wide Bandwidth
摘要： Two-dimensional (2D) semiconductors have been extensively explored as a new class of materials with great potential. In particular, black phosphorus (BP) has been considered to be a strong candidate for applications such as high-performance infrared photodetectors. However, the scalability of BP thin film is still a challenge, and its poor stability in the air has hampered the progress of the commercialization of BP devices. Herein, we report the use of hydrothermal-synthesized and air-stable 2D tellurene nanoflakes for broadband and ultrasensitive photodetection. The tellurene nanoflakes show high hole mobilities up to 458 cm2/V·s at ambient conditions, and the tellurene photodetector presents peak extrinsic responsivity of 383 A/W, 19.2 mA/W, and 18.9 mA/W at 520 nm, 1.55 μm, and 3.39 μm light wavelength, respectively. Due to the photogating effect, high gains up to 1.9 ×103 and 3.15×104 are obtained at 520 nm and 3.39 μm wavelength, respectively. At the communication wavelength of 1.55μm, the tellurene photodetector exhibits an exceptionally high anisotropic behavior, and a large bandwidth of 37 MHz is obtained. The photodetection performance at different wavelength is further supported by the corresponding quantum molecular dynamics (QMD) simulations. Our approach has demonstrated the air-stable tellurene photodetectors that fully cover the short-wave infrared band with ultrafast photoresponse.
关键词： air-stable,two-dimensional (2D),wide bandwidth,tellurene,photodetector,high gain
更新于2025-09-12 10:27:22
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[IEEE 2018 IEEE International Conference on Consumer Electronics - Asia (ICCE-Asia) - Jeju (2018.6.24-2018.6.26)] 2018 IEEE International Conference on Consumer Electronics - Asia (ICCE-Asia) - Wideband Aperture-Coupled Stack-Patch Antenna Design with Characteristic Mode Analysis
摘要： These days’ RF communication frequencies, and technology is advancing towards a higher frequency spectrum with wide bandwidth for higher data rate, miniaturization and portability. For high frequency and wide bandwidth a low loss, efficient and compact wideband microstrip antenna development with convenient analysis is crucial. In this paper, we developed a wide band highly efficient stack patch antenna for Ku-band and analyze the model with characteristics mode analysis. The developed antenna has -10dB impedance bandwidth from 13.1-15.2GHz and -30dB bandwidth from 14-14.5GHz. Higher impedance matching leads to higher efficiency and high gain for the target center frequency of 14.25GHz.
关键词： characteristic mode analysis,high efficiency antenna,Stack patch antenna,wide bandwidth,low loss antenna
更新于2025-09-11 14:15:04
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[ASME ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems - San Antonio, Texas, USA (Monday 10 September 2018)] Volume 2: Mechanics and Behavior of Active Materials; Structural Health Monitoring; Bioinspired Smart Materials and Systems; Energy Harvesting; Emerging Technologies - Experimental Studies on a Compressive-Mode Piezoelectric Transducer for Low-Frequency and Wide-Band Energy Harvesting
摘要： In this paper, we report a low-frequency and wide-bandwidth piezoelectric energy transducer. The transducer is designed based on a piezoelectric plate, a truss mechanism, a spring-mass system and a stopper. The spring-mass system receives kinetic energy from excitation and induces forces, which are transmitted, amplified by truss mechanism and applied onto the piezoelectric plate. The stopper is added to truncate the amplitude of the mass. The mass and the stopper interact through impacts. The impact force triggers dynamic bifurcation in the transducer. By taking advantage of the superharmonic resonances and nonlinearity born from the bifurcation, the transducer is able to work efficiently with a wide bandwidth. Through experiment studies on a fabricated prototype, the lowest resonant frequency is around 3.2Hz with the peak-peak voltage output up to 55V. The bandwidth of the transducer is approximately 4.5Hz out of our targeted frequency domain [2.5Hz, 10Hz], broadened by up to 20 times compared to that of the linear system without the stopper.
关键词： superharmonic resonances,wide-bandwidth,low-frequency,piezoelectric energy transducer,nonlinearity
更新于2025-09-10 09:29:36