A5016080913- Antenna Design and Analysis
- Advanced Antenna and Metasurface Technologies
- Metamaterials and Metasurfaces Applications
- Antenna Design and Optimization
- Microwave Engineering and Waveguides
- Energy Harvesting in Wireless Networks
- Plasmonic and Surface Plasmon Research
- RFID technology advancements
- Photonic and Optical Devices
- Millimeter-Wave Propagation and Modeling
- Semiconductor Lasers and Optical Devices
- Microwave and Dielectric Measurement Techniques
- Photonic Crystals and Applications
- Wireless Body Area Networks
- Optical Network Technologies
- Electromagnetic Compatibility and Noise Suppression
- Full-Duplex Wireless Communications
- Electromagnetic Compatibility and Measurements
- Indoor and Outdoor Localization Technologies
- Acoustic Wave Resonator Technologies
- Microwave Imaging and Scattering Analysis
- Advanced Photonic Communication Systems
- Wireless Power Transfer Systems
- Ultrasound and Hyperthermia Applications
- Radio Wave Propagation Studies
University of Alberta
2016-2025
BAE Systems (United States)
2023-2024
Gorgias Press (United States)
2022-2024
The Ohio State University
2023-2024
National Technical University of Athens
2022-2024
Marvell (United States)
2023-2024
Colorado State University
2023-2024
Technology Innovation Institute
2024
The University of Queensland
2024
University of Siena
2022-2023
Recent demonstrations of negative refraction utilize three-dimensional collections discrete periodic scatterers to synthesize artificial dielectrics with simultaneously permittivity and permeability. In this paper, we propose an alternate perspective on the design function such materials that exploits well-known L-C distributed network representation homogeneous dielectrics. conventional low-pass topology, quantities L C represent a positive equivalent permeability permittivity,...
Limited sensitivity and sensing range are arguably the greatest challenges in microwave sensor design. Recent attempts to improve these properties have relied on metamaterial (MTM)-inspired open-loop resonators coupled transmission lines (TLs). Although strongly resonant of resonator sensitively reflect small changes environment through a shift its resonance frequency, resulting sensitivities remain ultimately limited by level coupling between TL. This paper introduces novel solution this...
Recent demonstrations of negative refraction utilize three-dimensional collections discrete periodic scatterers to synthesize artificial dielectrics with simultaneously permittivity and permeability. In this paper, it is shown that planar, two-dimensional L-C transmission line networks in a high pass configuration can demonstrate as consequence the fact such media support propagating backward waves. Simulations illustrating focusing at 2 GHz are subsequently presented.
Recently, three-dimensional composite periodic media comprising split-ring resonators (SRR) and thin wires have been shown to exhibit a negative refractive index in the frequency range around SRR resonance. In this letter, we propose transmission line models for studying interpreting electromagnetic propagation behavior of such materials. Based on these equivalent models, show that by periodically loading network lines with series capacitors shunt inductors, medium can be synthesized without...
The trajectory of technological progress is ultimately guided by constraints at the physical level. In building a better device or system, we are bound 1) properties materials available to us and 2) our understanding phenomena. laws universe, immutable as they are, lead naturally question whether may be able "engineer" raw allow achieve, control, manipulate natural phenomena for useful purposes. order do this, must first define what mean term "material." perception that material appear...
This paper presents a novel dual-band microstrip patch antenna that employs metamaterial-based electromagnetic bandgap (MTM-EBG) integrated into its radiating edges to support two distinct operating frequencies. The resulting is compact, uniplanar, completely printable, and via-free. Dispersion engineering of the MTM-EBG unit cell through rigorous multiconductor transmission-line analysis allows simple, systematic design for or more arbitrary Additionally, approach taken employ same...
We have previously shown that a new class of Negative Refractive Index (NRI) metamaterials can be constructed by periodically loading host transmission line medium with inductors and capacitors in dual (high-pass) configuration. A small planar NRI lens interfaced Positive (PRI) parallel-plate waveguide recently succeeded demonstrating focusing cylindrical waves. In this paper, we present theoretical experimental data describing the dispersion characteristics significantly improved device...
Focusing using conventional lenses relies on the collection and interference of propagating waves, but discounts evanescent waves that decay rapidly from source.Since these contain finest details source, image suffers a loss resolution is referred to as 'diffraction-limited'.Superlensing ability create an with fine features beyond diffraction limit, can be achieved 'Veselago-Pendry' lens made metamaterial.Such Veselago-Pendry superlens for imaging in free space must stringently designed...
This paper investigates the propagation characteristics of circular waveguides whose interior surface is coated with a thin metamaterial liner possessing dispersive, negative, and near-zero permittivity. A field analysis this system produces dispersion complex modes, reveals in detail intriguing phenomena such as backward-wave below unlined waveguide's fundamental-mode cutoff, resonant tunneling power, collimation, miniaturization. It shown how waveguide geometry parameters may be selected...
A volumetric free-space negative-refractive-index (NRI) transmission-line (TL) metamaterial lens is described that employs fully printed interdigitated capacitors and meandered inductors designed to exhibit NRI properties at X-band (8-12 GHz). The topology realized in a layer-by-layer fashion without any vias, which facilitates easy rapid fabrication. fabricated was tested for its transmission dispersion using measurement system consisting of an Agilent network analyzer, standard gain horn...
The suppression of parallel-plate modes is difficult to control over electrically short lengths. use electromagnetic bandgap (EBG) technology allows for a large with controllable bandwidth, but traditional EBGs are often too be used in practice. Moreover, some forms they require several metallization layers and/or interconnecting vias. We introduce metamaterial-based EBG that miniaturized, uniplanar, and fully printable the signals carried by mode. also present corresponding multiconductor...
In this article, a novel batteryless wireless sensor design is proposed and demonstrated. The passive node integrates ultrahigh-frequency (UHF) radio-frequency identification (RFID) chip, filter, reactive to enable the reading of environmental conditions wirelessly, without increasing complexity typical RFID chip substantial loss read range. changes phase reflected signal based on sensed parameter; whereas, filter helps in resolving any ambiguity that may arise due placement at different...
A design procedure for minimum- <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</i> spherical wire antennas of arbitrarily small electrical size is derived. Special cases circularly polarized and self-tuned designs are investigated, where the latter elliptically provides lowest any configuration radiated waves in electrically regime. The tested simulation to find that polarizations agree with theoretical predictions. basis these predictions...
We examine a new class of volumetric metamaterials based on two-dimensional (2D) transmission-line layers that exhibit negative refractive index (NRI). The dispersion characteristics single 2D layer are revealed through periodic analysis, and the effective-medium response layered topology is predicted by an intuitive equivalent circuit model. Dispersion transmission also obtained for various designs using full-wave finite-element method (FEM) simulations, including one design meeting...
A volumetric metamaterial lens exhibiting a negative refractive index (NRI) at C-band is designed and its free-space focusing properties are experimentally verified. The employs multilayer geometry unit cells loaded using metal-insulator-metal (MIM) capacitors dual-arm spiral inductors in biplanar configuration. These elements, although fully printed without vias, provide strong reactive loading that enables cell size of λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
This work presents experimental verification of free-space subdiffraction imaging using a Veselago-Pendry superlens [Sov. Phys. Usp. 10, 509 (1968); Rev. Lett. 85, 3966 (2000)] based on the negative-refractive-index transmission-line approach. The is able to resolve two sources λ0∕3 apart not only at design frequency 2.40GHz, where metamaterial possesses μ and ϵ equal −μ0 −ϵ0, respectively, but also 2.08GHz, experiences resonance in μ.
A novel low-cost 3-D-printed reflectarray is proposed based on a spatial phase-shifting technique. It consists of layer patches and underlayer covered by copper tape that acts as ground plane. As part this study, fabrication technique used to design for 5G millimeter-wave frequencies. At 35 GHz, far-field patterns various radiation angles have been observed, alongside the achievement reflection magnitude phase characteristics spanning frequency range from 20 42 GHz. good agreement observed...