Results 41 to 50 of about 1,054 (130)

DISEÑO Y SIMULACIÓN DE UNA ANTENA PIFA PARA IOT

Telemática, 2021
Esta investigación presenta el diseño de una antena plana en forma de “F” invertida (PIFA) para Internet de las Cosas (IoT), con una frecuencia principal de resonancia fr = 2.45 GHz, pero pudiendo ser utilizada también como antena multibanda.
Jesús Calixto Méndez, Benigno Rodríguez Díaz, Javier Schandy Wood, Mauricio González Nappa   +3 more
doaj  

Multiband Split-Ring Resonator Based Planar Inverted-F Antenna for 5G Applications

International Journal of Antennas and Propagation, 2017
5G, the fifth generation of wireless communications, is focusing on multiple frequency bands, such as 6 GHz, 10 GHz, 15 GHz, 28 GHz, and 38 GHz, to achieve high data rates up to 10 Gbps or more.
Muhammad Kamran Ishfaq, Tharek Abd Rahman, Hassan Tariq Chattha, Masood Ur Rehman   +3 more
doaj   +1 more source

A Modular Chemoenzymatic Cascade Simplifies Divergent Synthesis of Natural and Unnatural Benzylisoquinoline Alkaloids

Advanced Science, Volume 13, Issue 1, 5 January 2026.
A simplified chemoenzymatic platform is designed to integrate an enzyme cascade with subsequent chemical steps, enabling the divergent production of diverse benzylisoquinoline alkaloids (BIAs). Demonstrating remarkable versatility and enantioselectivity, four distinct classes of BIAs are efficiently generated, in which the natural medicine papaverine ...
Huiling Liu, Zhenbo Yuan, Yue Gao, Fei Li, Zhiwei Deng, Yan Zhang, Zhengshan Luo, Changmei Liu, Yijian Rao   +8 more
wiley   +1 more source

A Low Profile Two‐Sided Anti‐Metal UHF RFID Tag Antenna Based on Square–Ring Embedded Coupling Structure

IET Microwaves, Antennas &Propagation, Volume 20, Issue 1, January/December 2026.
A compact ultra‐high frequency (UHF) radio frequency identification (RFID) tag antenna for two‐sided anti‐metal performance is proposed. ABSTRACT A compact ultra‐high frequency (UHF) radio frequency identification (RFID) tag antenna for two‐sided anti‐metal performance is proposed.
Wangfu Lai, Huayun Lan, Jiade Yuan
wiley   +1 more source

Ultra‐Wideband Coupled‐Fed Loop Antenna Pair for 5G Mobile Terminals

IET Microwaves, Antennas &Propagation, Volume 20, Issue 1, January/December 2026.
This paper presents an ultra‐wideband (UWB) antenna pair for 5G mobile terminals. The UWB antenna pair is composed of two coupled‐fed loop antennas with a common shorted branch, which achieves a compact size. The experimental results show that the MIMO array covers 3.3–7.8 GHz with a relative bandwidth of 81.08%, and the isolation between ports is ...
Aidi Ren, Wenyi Song, Zhanhao Zhang, Ying Liu, Lixia Yang, Yingsong Li, Zhixiang Huang   +6 more
wiley   +1 more source

SAR Reduction Using Integration of PIFA and AMC Structure for Pentaband Mobile Terminals

International Journal of Antennas and Propagation, 2017
In this paper, a capacitive grating artificial magnetic conductor (AMC) is presented to reduce the specific absorption rate (SAR) in pentaband mobile terminals. The AMC structure is implemented using a dielectric film with the printed arrays of the metal
Jae-Gon Lee, Jeong-Hae Lee
doaj   +1 more source

A Dual‐Band Patch Antenna for Skin Implant Applications: Design, Optimization, and Performance Evaluation

International Journal of RF and Microwave Computer-Aided Engineering, Volume 2026, Issue 1, 2026.
This work presents a compact dual‐band patch antenna designed for skin implant applications. The antenna features a robot‐shaped patch structure on FR‐4 substrate and resonates at dual bands of 915 and 2430 MHz. Three techniques are employed to miniaturize the antenna: a shorting pin between the patch and ground, defected ground structure (DGS), and ...
Emtiaz Ahmed Mainul, Md Faruque Hossain, Bhaskar Gupta   +2 more
wiley   +1 more source

Total synthesis of (±)-decursivine via BINOL-phosphoric acid catalyzed tandem oxidative cyclization

Scientific Reports, 2021
The synthesis of tetracyclic indole alkaloid (±)-decursivine was accomplished using BINOL-phosphoric acid catalyzed tandem oxidative cyclization as a key step with (bis(trifluoroacetoxy)iodo)benzene (PIFA) as an oxidizing agent.
Prakash T. Parvatkar, Eugene S. Smotkin, Roman Manetsch   +2 more
doaj   +1 more source

Synthesis of Novel BINOL Analogs: 3,3′‐Dicarbonyl‐1,1′‐binaphthyl‐4,4′‐diols as Precursors to the Uncharted 5,5′‐Binaphtho[2,1‐d]isoxazole

European Journal of Organic Chemistry, Volume 28, Issue 45, December 10, 2025.
The parent 5,5′‐binaphtho[2,1‐d]isoxazole and its 3,3′‐dimethyl and 3,3′‐diphenyl derivatives are synthesized via condensation of the respective dicarbonyl compounds with hydroxylamine, followed by cyclodehydration of the resulting dioximes. The dicarbonyl precursors are obtained through 4‐ or 6‐step sequences from 1‐naphthol or 1‐naphthaldehyde ...
Marek Surowiec, Ioannis E. Gerontitis, Petros G. Tsoungas, Panteleimon G. Takis, Panagiotis Stathopoulos, Erietta Pouliou, George Varvounis   +6 more
wiley   +1 more source

Synthesis of 6-Methoxy-1-oxaspiro[4,5]deca-6,9-diene-8-one

Molecules, 2002
The synthesis of a new spirolactone is described. The title compound is obtained as a white solid in 46% yield from 3-(4-hydroxy-2-methoxyphenyl)propanoic acid using [Bis(trifluoroacetoxy)iodo]benzene (PIFA) as the oxidant.
Benjamin B. Fisher, Guy L. Plourde
doaj   +1 more source