A broadband metasurface flat lens is proposed as a polarization-independent wideband superstrate for wave focusing and gain enhancement at Ka-band. The proposed metasurface structure consists of four metal layers and is designed with diagonally symmetric unit cells to accommodate both the vertical and horizontal polarizations. The focusing ability of the proposed metasurface flat lens is validated via simulation and measurement, where normally incident plane waves are shown to be enhanced by up to 11 dB as a result of wave focusing. Also, the radiation gain enhancement due to the proposed metasurface flat lens is demonstrated via simulation and measurement, where a gain enhancement of up to 10.5 dB is achieved. The results show that the proposed structure maintains the wave focusing and gain enhancement characteristics over a bandwidth of 28-32 GHz. Furthermore, to demonstrate the utility of the proposed metasurface for circular polarization (CP), the gain enhancement of a CP patch antenna as a result of implementing the proposed metasurface as a superstrate is demonstrated via simulation and measurement. It is shown that the proposed metasurface superstrate provides a CP gain enhancement of nearly 10 dB.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9283457 | PMC |
| http://dx.doi.org/10.1038/s41598-022-16037-1 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Perspectives on Swedish Regulations for Online Record Access Among Adolescents With Serious Health Issues and Their Parents: Mixed Methods Study.
JMIR Pediatr Parent
January 2025
Participatory eHealth and Health Data Research Group, Department of Women's and Children's Health, Uppsala University, Uppsala, Sweden.
Background: With the increasing implementation of patient online record access (ORA), various approaches to access to minors' electronic health records have been adopted globally. In Sweden, the current regulatory framework restricts ORA for minors and their guardians when the minor is aged between 13 and 15 years. Families of adolescents with complex health care needs often desire health information to manage their child's care and involve them in their care.
View Article and Find Full Text PDFInsight into Charge Transport Behaviors in Hematite Photoanodes via Potential-Dependent Impedance Spectroscopy and Machine Learning.
ACS Appl Mater Interfaces
January 2025
Department of Applied Chemistry, Chuo University, Tokyo 112-8551, Japan.
We employed machine learning (ML) techniques combined with potential-dependent photoelectrochemical impedance spectroscopy (pot-PEIS) to gain deeper insights into the charge transport mechanisms of hematite (α-FeO) photoanodes. By the Shapley Additive exPlanations (SHAP) analysis from the ML model constructed from a small data set (dozens of samples) of electrical parameters obtained from pot-PEIS and the PEC performance, we identified the dominant factors influencing the electron transport to the back contact in the bulk and hole transfer to a solution at the hematite/electrolyte interface. The results revealed that shallow defect states significantly enhance electron transport, while deep defect states impede it, and also one of the surface states enhances the hole transfer to the electrolyte solution.
View Article and Find Full Text PDFRecovery and Degradation Drive Changes in the Dispersal Capacity of Stream Macroinvertebrate Communities.
Glob Chang Biol
January 2025
Department of River Ecology and Conservation, Senckenberg Research Institute and Natural History Museum Frankfurt, Gelnhausen, Germany.
Freshwater ecosystems face significant threats, including pollution, habitat loss, invasive species, and climate change. To address these challenges, management strategies and restoration efforts have been broadly implemented. Across Europe, such efforts have resulted in overall improvements in freshwater biodiversity, but recovery has stalled or failed to occur in many localities, which may be partly caused by the limited dispersal capacity of many species.
View Article and Find Full Text PDFWhy do most people on dialysis not accept psychological care to increase perceptions of control in life?
Br J Health Psychol
February 2025
Department of Health Psychology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
Objectives: People with chronic kidney failure (CKF) on dialysis who perceive little control in life are at risk for a reduced well-being. We developed and tested an intervention aiming to enhance their perceptions of control. To gain insight into patients' care needs and acceptance of the intervention, we examined the prevalence of patients perceiving low control, their characteristics, and their reasons for (not) accepting the intervention.
View Article and Find Full Text PDFA BiO-Optimizing Site Targeted (BOOST) Approach to Periodontal Regeneration Through Local Doxycycline Prior to Surgery: A Randomized Clinical Trial.
J Periodontal Res
January 2025
Department of Surgical Sciences, C.I.R. Dental School, University of Turin, Turin, Italy.
Aim: To test a BiO-Optimizing Site Targeted (BOOST) approach to periodontal regeneration by the adjunctive use of locally delivered doxycycline (DOX) 2 weeks prior to minimally invasive surgery in terms of clinical and radiographic outcomes at 1 year.
Methods: For this randomized clinical trial, stage III/IV periodontitis patients presenting sites with intrabony defects and bleeding on probing (BoP+) after steps 1-2 of periodontal treatment were included. Sites were treated via subgingival instrumentation with or without a BOOST approach by local DOX.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!