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[IEEE 2018 International Semiconductor Conference (CAS) - Sinaia (2018.10.10-2018.10.12)] 2018 International Semiconductor Conference (CAS) - Metal-Insulator Transition in Monolayer M<inf>o</inf>S<inf>2</inf> for Tunable and Reconfigurable Devices
摘要： In this paper, we show the electromagnetic design of a small patch antenna based on a molybdenum disulphide (MoS2) monolayer, with an area of only 22mm2, that exhibits high radiation efficiency and large tunability in microwaves at 10GHz thanks to a metal-insulator transition (MIT) induced by electrostatic gating. Furthermore, the MIT in MoS2 is used to reconfigure a tunable carbon nanotube-based filter, conferring it different functionalities: low-pass, high-pass and band-pass around 2GHz, while its carbon nanotube varactors allow tuning the cutoff frequency or central frequency.
关键词： tunable filters,carbon nanotubes,Microstrip antennas,molybdenum compounds
更新于2025-09-23 15:22:29
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - A Technique to Suppress Mutual Coupling in Densely Packed Antenna Arrays Using Metamaterial Supersubstrate
摘要： A simple and practical technique for reducing the mutual coupling between neighbouring antennas is presented for application in densely packed antenna arrays. This is achieved by locating between the radiation elements a smaller patch with metamaterial decoupling structure (MTM-DS). In this case the radiating elements are circular patches and the MTM-DS is constructed from a hexagonal slit resonator. The consequence of implementing the MTM-DS patch is significant reduction in mutual coupling between adjacent radiating patches by 60%, improvement in impedance match by 200% and substantial increase in the antenna’s fractional bandwidth by 369%. Since the ground plane is unaltered the front-to-back ratio is unaffected too. The proposed technique is easily realizable and can be used effectively in beam scanning applications.
关键词： phased antenna arrays,metamaterial,Mutual coupling,microstrip antennas,beam scanning
更新于2025-09-23 15:22:29
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Fast and accurate model for a coax-fed rectangular patch antenna with varying aspect ratio, feed location and substrate electrical parameters
摘要： An improved closed-form model based on cavity model and single resonant parallel R-L-C circuit analysis is proposed to predict the resonant frequency, quality factor, bandwidth, gain and input impedance of a coax-fed rectangular patch antenna as a function of aspect ratio, feed location and substrate electrical parameters. The computed values employing the present model are compared with our experimental results and experimental results available in open literature. We have also employed electromagnetic high-frequency structure simulator (HFSS) software to validate the model. The present model shows very close agreements with the experimental and simulation results compared to the other models. This model is very simple, fast and accurate. The present model can be directly applied to CAD program.
关键词： Improved closed-form model,microstrip antennas,gain,bandwidth,input impedance,resonant frequency,quality factors
更新于2025-09-19 17:15:36
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Recycled polyolefin as dielectric substrate for patch antennas
摘要： High-performance antennas operating at ultra-high frequency (UHF) are typically designed and fabricated using specialized radio frequency (RF) materials with low loss and consistent properties. This paper proposes and investigates the use of recycled polyolefin (high-density polyethylene and polypropylene) which is not specifically manufactured for RF applications and thus with unknown RF properties, as dielectric substrate for high-performance UHF patch antennas. As a demonstrative application, a polarization-reconfigurable patch antenna with dual feeds is designed and fabricated using adhesive copper foil on recycled polyolefin substrate. Depending on the feed’s magnitude and phase, different types of linear and circular polarizations can be achieved. The point of resonance for both ports is centered at 915 MHz with 10 dB return loss and bandwidth of 28 MHz. Port isolation is as low as ?17 dB with peak linear and circular gain of 7.0 dBi, and 7 dBiC, respectively, observed in all polarizations. The resulting antenna not only performs well, but is also lightweight, low moisture absorbent, mechanically sturdy, inexpensive and ecologically friendly arising from its use of recycled materials.
关键词： microstrip antennas,dielectric materials,polarization-reconfigurable,UHF antennas,dielectric measurements,recycled polyolefin
更新于2025-09-12 10:27:22
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[IEEE 2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO) - Mauritius (2018.10.15-2018.10.18)] 2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO) - A Pattern-Reconfigurable Single-Element Microstrip Antenna
摘要： A pattern-recon?gurable antenna based on a simple single-element microstrip antenna is presented. The antenna has a shorting wall near the patch center to introduce two slightly shifted resonances at its two radiating edges. A stub-loaded varactor is mounted at one of the patch radiating edges to obtain pattern recon?gurability, by electronically detuning the frequency of one of the resonances. Preliminary measurements of a prototype demonstrate that the antenna exhibits beam squint up to 39? on one side of the patch at the center frequency of 2.40 GHz, when the bias voltage is tuned from 18 to 3.8 V. Also for a ?xed bias voltage of 6.3 V, the beam can scan from 8? to 43? as a function of frequency within the operation bandwidth from 2.35 to 2.45 GHz. The presented results validate the concept which will be further extended to scan beam on two sides with frequency selectivity.
关键词： Pattern recon?gurable,recon?gurable antennas,stub-loaded microstrip line,varactors,microstrip antennas
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE International Conference on Electro/Information Technology (EIT) - Rochester, MI (2018.5.3-2018.5.5)] 2018 IEEE International Conference on Electro/Information Technology (EIT) - Hybrid Perturbation Technique Applied to Stacked Patches for Circular Polarization
摘要： In this paper, a wideband circularly polarized (CP) stacked microstrip antenna is presented. CP is achieved by using hybrid perturbation technique, where positive perturbations are applied to the driven patch and negative perturbations to the parasitic patch. The axial ratio bandwidth achieved is wider than that from typical CP patch antennas. The antenna is excited by a probe-feed without requiring any complex dual feed network to generate two equal and orthogonal modes necessary for the CP generation. This reduces the system complexity and saves space in the antenna in comparison to those with dual feeds. The antenna exhibits a simulated impedance bandwidth of (for S11 = -10 dB) 10.4%, and axial ratio (AR ~ 3 dB) bandwidth of 2.8%. The antenna demonstrates broad axial ratio beamwidth in both planes which is useful for wide angular coverage.
关键词： hybrid perturbations,axial ratio bandwidth,stacked patch antenna,Circularly polarized (CP) antennas,microstrip antennas
更新于2025-09-04 15:30:14