Results 21 to 30 of about 2,199 (214)

Technologies for Near-Field Focused Microwave Antennas

International Journal of Antennas and Propagation, 2017
This paper provides a review spanning different technologies used to implement near-field focused antennas at the microwave frequency band up to a few tens of GHz: arrays of microstrip patches and printed dipoles, arrays of dielectric resonator antennas,
Paolo Nepa, Alice Buffi, Andrea Michel, Giuliano Manara   +3 more
doaj   +1 more source

Size-Reduction of a Dual-Band Circularly Polarized Dielectric Resonator Antennas

IEEE Access, 2021
In this paper, the size reduction of a dual-band circularly polarized (CP) Y-shaped dielectric resonator antenna (YDRA) is performed. Unlike the conventional CP DRAs, the circular polarization in the YDRA is achieved by the combination of linearly ...
Amir Altaf, Munkyo Seo
doaj   +1 more source

Wideband and UWB Antennas for Wireless Applications: A Comprehensive Review

International Journal of Antennas and Propagation, 2017
A comprehensive review concerning the geometry, the manufacturing technologies, the materials, and the numerical techniques, adopted for the analysis and design of wideband and ultrawideband (UWB) antennas for wireless applications, is presented. Planar,
Renato Cicchetti, Emanuela Miozzi, Orlandino Testa   +2 more
doaj   +1 more source

Additive Manufacturing of Linear Continuous Permittivity Profiles and Their Application to Cylindrical Dielectric Resonator Antennas

IEEE Open Journal of Antennas and Propagation, 2023
The utilization of additive manufacturing (AM) to engineer the permittivity profile of dielectric resonator antennas (DRAs) is considered. For the first time, the capabilities of AM are exploited to create continuously swept permittivity profiles and ...
Simon P. Hehenberger, Stefano Caizzone, Alexander G. Yarovoy   +2 more
doaj   +1 more source

Wearable Smart Patches on Sustainable Chitosan With Reversible Microbial Growth‐Inhibitory Properties

Advanced Functional Materials, EarlyView.
ABSTRACT Chitosan, a polysaccharide upcycled from biowaste, has long promised sustainable, biocompatible, and antimicrobial films and devices, an appeal reinforced by its recent regulatory recognition, with several chitosan‐based antibacterial dressings gaining clearance through the Food and Drug Administration's 510(k) pathway.
Jacopo Nicoletti, Kubra Kocak, Andrea Michel, Enrico Cavarzerani, Ali Raza, Petr Rohzin, Nouha Loudhaief, Saimir Frroku, Nicolò Baldovin, Hazrat Bilal, Alvise Perosa, Maurizio Selva, Flavio Rizzolio, Luca Sbuelz, Sabrina Tamburini, Domenico De Fazio, Giovanni Antonio Salvatore   +16 more
wiley   +1 more source

Electrode and Microstructure Dependence of Oxygen Diffusion in Ferroelectric Hafnium Zirconium Oxide Thin Films

Advanced Functional Materials, EarlyView.
Significant nanoscale oxygen diffusion coefficient variations are measured in ferroelectric hafnium zirconium oxide films with grain boundaries and electrode interfaces exhibiting values 104 times larger than the grain cores. Overall coefficients are 10X larger for films prepared with metal nitride electrodes compared to refractory metals. New insights
Liron Shvilberg, Thomas W. Pfeifer, Chuanzhen Zhou, Yong Kyu Choi, Duk‐Hyun Choe, Patrick E. Hopkins, Jon F. Ihlefeld   +6 more
wiley   +1 more source

Low-profile miniaturized dielectric resonator array antenna design for frequency division duplex based on sequential rotation method

Frontiers in Physics
IntroductionThe antenna must adhere to more stringent requirements, including multi-band operation, high performance, and compact design, since it is the primary component of satellite communication systems.
Mohd Aliff Afira Sani, Nor Samsiah Sani, Michal Prauzek, Jaromir Konecny, Hung Tran-Huy, Trang Hoang-Thu, Iyas Qaddara, Heba G. Mohamed, Darius Andriukaitis   +8 more
doaj   +1 more source

Broadbeam Cylindrical Dielectric Resonator Antenna

IEEE Access, 2019
A novel widebeam aperture-coupled cylindrical dielectric resonator antenna is proposed, which consists of multi-layered cylindrical ceramic disks joined together to achieve the required height.
Syeda H. H. Mashhadi, Yong-Chang Jiao, Jingdong Chen   +2 more
doaj   +1 more source

Horn antenna based on a foreign rectangular waveguide with partial dielectric filling and coupling loop

Технічна інженерія, 2020
The characteristics of the horn antenna based on the foreign rectangular waveguide with partial dielectric filling (PDF) and the communication loop are considered.
N.M. Каrashchuk, V.P. Маnoilov, Т.M. Nikitchuk, V.V. Chukhov, P.P. Martynchuk   +4 more
doaj   +1 more source

Semiconducting Polymers Post‐Functionalized With Ureido‐Pyrimidinone for Robust Stretchable Transistors

Advanced Functional Materials, EarlyView.
The design of intrinsically robust stretchable semiconducting polymers was achieved through OTBS‐mediated post‐functionalization of PDPP2T side chains with UPy units, generating dual hydrogen‐bonding motifs comprising weaker urethane linkages and strong quadruple UPy interactions along the long alkyl side chain, which is crucial for achieving desirable
Dinda Bazliah, Livy Laysandra, Kosuke Terayama, Xingyu Yang, Atsushi Isobe, Tai‐Chin Chiang, Tsuyoshi Michinobu, Yu‐Cheng Chiu   +7 more
wiley   +1 more source