Journal ArticleDOI
On the Reflection Characteristics of a Reflectarray Element with Low-Loss and High-Loss Substrates
TLDR
In this article, the authors revisited the loss phenomenon for a microstrip patch in reflectarray mode, and discussed the reflection characteristics (magnitude and phase) for a reflectarray element with low and high-loss substrates.Abstract:Â
This paper revisits the loss phenomenon (particularly, the dielectric loss) for a microstrip patch in reflectarray mode, and discusses the reflection characteristics (magnitude and phase) for a reflectarray element with low- and high-loss substrates. First, the dielectric losses that occur in a lossy slab backed by a perfect electric conductor are both analytically and numerically investigated. Using similar numerical analysis, the reflectarray element (a patch on top of a slab backed by a conductor) is characterized, based on dielectric losses and reflection behavior. It is observed that for low-loss substrates, the dielectric loss decreases with increasing substrate thickness (as previously suggested in the literature). More importantly, for high-loss substrates, the dielectric loss no longer follows the expected trend (decreasing loss with increasing substrate thickness). The dielectric loss becomes a complex phenomenon, involving the dielectric loss tangent and substrate thickness. It is therefore noted that it is important to recognize the well-behaved and misbehaved phase-swing region for high-loss substrates for a reflectarray element. A simple circuit-model representation is provided for the reflectarray element. The anomalous phase behavior observed for high-loss substrates is explained using pole-zero analysis. Waveguide measurements are performed to quantify these reflectarray losses for low- and high-loss substrates. Finally, the loss mechanisms in a patch reflectarray (scattering mode) are compared to a patch antenna (radiation mode), using parameters such as reflection power and radiation efficiency, and similar loss mechanisms for both structures are apparent.read more
Citations
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Journal ArticleDOI
3D Printed Dielectric Reflectarrays: Low-Cost High-Gain Antennas at Sub-Millimeter Waves
Payam Nayeri,Min Liang,Rafael Sabory-Garcia,Mingguang Tuo,Fan Yang,Michael E. Gehm,Hao Xin,Atef Z. Elsherbeni +7 more
TL;DR: In this paper, a low-loss and low-cost solution for high gain terahertz (THz) antennas is proposed, where variable height dielectric elements are used in the reflectarray designs.
Journal ArticleDOI
A Circuit-Based Model for the Interpretation of Perfect Metamaterial Absorbers
TL;DR: In this article, a perfect metamaterial absorbing structure over a thin low-loss grounded substrate is studied by resorting to an efficient transmission line model, which allows the derivation of simple and reliable closed formulas describing the absorption mechanism of the subwavelength structure.
Journal ArticleDOI
Comparison of electromagnetic shielding with polyaniline nanopowders produced in solvent-limited conditions.
TL;DR: This work is the first to demonstrate that limiting solvent and oxidizer enhances electromagnetic interactions for shielding microwaves in polyaniline nanopowders.
Journal ArticleDOI
Closed-Form Analysis of Reflection Losses in Microstrip Reflectarray Antennas
Filippo Costa,Agostino Monorchio +1 more
TL;DR: In this paper, the analytical expressions of the surface impedance offered by a high-impedance surface (HIS) as a function of the imaginary part of the dielectric permittivity of the substrate are derived through well justified approximations.
Journal ArticleDOI
A Review of Wideband Reflectarray Antennas for 5G Communication Systems
TL;DR: The fundamental and advanced topologies of reflectarray design implementations, which are needed particularly for its broadband features, are surveyed.
References
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Journal ArticleDOI
Design of millimeter wave microstrip reflectarrays
TL;DR: In this paper, the theoretical modeling and practical design of millimeter wave reflectarrays using microstrip patch elements of variable size is discussed and a full-wave treatment of plane wave reflection from a uniform infinite array of microstrip patches is described and used to generate the required patch-design data and to calculate the radiation patterns of the reflectarray.
Journal ArticleDOI
RFID Tag and RF Structures on a Paper Substrate Using Inkjet-Printing Technology
TL;DR: In this article, an inkjet-printed UHF and microwave circuits fabricated on paper substrates are investigated for the first time as an approach that aims for a system-level solution for fast and ultra-low-cost mass production.
Journal ArticleDOI
Losses in Microstrip
TL;DR: In this paper, expressions for the conductor loss in microstrip transmission lines are derived for rutile and alumina substrates, taking into account the finite thickness of the strip conductor and apply to the mixed dielectric system.
Journal ArticleDOI
Microstrip lines for microwave integrated circuits
TL;DR: In this article, the authors report the impedance and attenuation measurements performed on microstrips, which are useful for the microwave and millimeter wave hybrid integrated circuits required for solid-state radio systems because of their simplicity and planar structure.
Book
Advances in microstrip and printed antennas
Kai-Fong Lee,Wei Chen +1 more
TL;DR: Lee et al. as discussed by the authors used the Finite Difference Time Domain (FDTD) method to construct a probe-fed multilayer microstrip antenna. But their work focused on the design of the antenna.
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