AI Article Synopsis
- The paper introduces a tunable rasorber designed to reduce radar cross-section (RCS) and infrared emissions, making it effective for stealth applications.
- It utilizes varactor diodes and frequency-selective surfaces to continuously adjust the transmission frequency from 1.8 to 4.5 GHz while also achieving over 10 dB RCS reduction in a broader range from 5.4 to 14.1 GHz.
- An additional layer made from ITO film provides low infrared emissivity, achieving an average value of 0.33, and the findings support its potential use in secure communication and multi-spectrum stealth technologies.
Article Abstract
In this paper, an actively tunable rasorber with broadband RCS reduction and low infrared emissivity is proposed. The rasorber can achieve flexible control of the peak of the transmission frequency and make the platform invisible in multiple spectrum. Based on the combination of varactor diodes and bandpass frequency-selective surface (FSS), the transmission window can be continuously tuned from 1.8 to 4.5 GHz. The designed rasorber has more than 10 dB RCS reduction from 5.4 to 14.1 GHz. Furthermore, an infrared low emissivity layer based on ITO resistance film is added above the rasorber, and the average infrared emissivity of the measured surface is 0.33. The experimental and simulation results are in good agreement. This work is expected to be applied to frequency hopping secure communication and ultra-wideband, multi-spectrum stealth.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OE.494952 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Correlation between dietary calcium intake and eczema in American adult population.
Sci Rep
December 2024
Department of Dermatology, Affiliated Hospital of Jiangnan University, 1000 Hefeng Road, Binhu District, WuxiCity, 214122, China.
Eczema is a common chronic skin condition. Previous studies indicated the dietary factors, such as calcium intake, might influence the onset and progression of eczema in the population of gravidas and infants. However, there was no studies on the correlation between dietary calcium and the adult population.
View Article and Find Full Text PDFMulti-angle acquisition and 3D composite reconstruction for organ-targeted PET using planar detectors.
Med Phys
December 2024
Department of Physics, Lakehead University, Thunder Bay, Ontario, Canada.
Background: This study investigates a multi-angle acquisition method aimed at improving image quality in organ-targeted PET detectors with planar detector heads. Organ-targeted PET technologies have emerged to address limitations of conventional whole-body PET/CT systems, such as restricted axial field-of-view (AFOV), limited spatial resolution, and high radiation exposure associated with PET procedures. The AFOV in organ-targeted PET can be adjusted to the organ of interest, minimizing unwanted signals from other parts of the body, thus improving signal collection efficiency and reducing the dose of administered radiotracer.
View Article and Find Full Text PDFAssociation of cardiovascular-kidney-metabolic index with all-cause mortality during hospitalization in critically ill patients: a retrospective cohort study from MIMIC IV2.2.
Front Cardiovasc Med
December 2024
Department of Cardiology, Renji Hospital Ningbo Branch, Shanghai Jiao Tong University School of Medicine, Ningbo, China.
Background: The cardiovascular-kidney-metabolic index (CKMI), a novel functional indicator proposed in this study, aims to accurately reflect the functional status of the heart, kidneys, and metabolism. However, its ability to predict mortality risk in critically ill patients during their stay in the intensive care unit (ICU) remains uncertain. Therefore, this study aims to validate the correlation between the CKMI during hospitalization and all-cause mortality.
View Article and Find Full Text PDFGuided and Space Waves Multiplexed Metasurface for Advanced Electromagnetic Functionalities in Microwave Region.
Adv Mater
December 2024
Advanced Microscopy and Instrumentation Research Center, Harbin Institute of Technology, Harbin, 150080, P. R. China.
Nowadays, metasurfaces have attracted considerable attention due to their promising and advanced control of electromagnetic (EM) waves. However, it is still challenging to shape guided waves into desired free-space mode, while simultaneously manipulating spatial incident waves using a single metasurface. Herein, a class of metasurfaces capable of multiplexing guided and space waves is proposed to achieve advanced EM functionalities in microwave regions, which can find great application potentials in radar systems, wireless communications, and wireless power transfer (WPT).
View Article and Find Full Text PDFNon-linear dose-response relationship between the visceral adiposity index and diabetes in adults with normoglycemia: a cohort study.
Front Endocrinol (Lausanne)
December 2024
Department of Nephrology, Shenzhen Second People's Hospital, Shenzhen, Guangdong, China.
Objective: Previous studies have identified a positive link between the visceral adiposity index (VAI) and diabetes in specific populations. Our investigation focused on examining this association in normoglycemic adults in Japan.
Methods: A cohort study of NAGALA (NAfld in the Gifu Area Longitudinal Analysis) was undertaken from 2004 to 2015 in Japan.
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!