Results 21 to 30 of about 3,874,774 (303)

Design of 230 GHz fixed attenuator based on LCT telescope receiver

open access: yes上海师范大学学报. 自然科学版, 2023
In this paper, based on the principle of absorption attenuators, circular and Lance-shaped fixed attenuators are designed and simulated respectively. They can achieve 10dB and 20dB attenuation in the frequency range of 200-260 GHz, and their attenuation ...
YUAN Zhongyu   +4 more
doaj   +1 more source

Optimization of a T-Shaped MIMO Antenna for Reduction of EMI

open access: yesApplied Sciences, 2020
In this paper, optimization of a miniaturized multiple-inputs multiple-outputs (MIMO) antenna was performed. This antenna was composed of a T-shape radiating element with stub and reduced ground plane and a compact size of 25 mm × 25 mm × 1.6 mm.
Dipesh Kapoor   +4 more
doaj   +1 more source

Manganese and Zinc Spinel Ferrites Blended with Multi-Walled Carbon Nanotubes as Microwave Absorbing Materials

open access: yesAerospace, 2017
Magnetic and dielectric materials can be blended to enhance absorption properties at microwave frequencies, although the materials may have relatively weak attenuation capabilities by themselves.
Ahmet Teber   +7 more
doaj   +1 more source

A Novel Evaluation Method For Particle Deposition Measurement

open access: yesOpen Physics, 2019
Normal operation of gas turbines will be affected by deposition on turbine blades from particles mixed in fuels. This research shows that it is difficult to monitor the mass of the particles deposition on the wall surface in real time.
Song Tao   +4 more
doaj   +1 more source

Corrosion Detection of Transmission and Transformation Reinforced Concrete Based on Microwave Reflection Method

open access: yesZhejiang dianli, 2022
In view of the corrosion of reinforced concrete structure for power transmission and transformation, a corrosion detection method based on microwave reflection method is proposed.
WANG Xujie   +5 more
doaj   +1 more source

Benefattori dall’aldilà: i lasciti per i lavori edilizi di pubblica utilità a Bologna (secoli XIII e XIV)

open access: yes, 2021
La trattazione riguarda i benefattori, i donatori che hanno deciso a Bologna di contribuire al bene comune non tramite le tradizionali istituzioni caritatevoli, quali ospedali, conventi e monasteri, ma anche attraverso l’investimento dei loro beni nel ...
Edward Loss
core   +1 more source

Design, Fabrication and Measurement of Radio Frequency Micro-Electro-Mechanical Systems

open access: yesIEEE Open Journal of Nanotechnology, 2023
This article describes the fabrication and experimental results of a novel step structure Radio Frequency Microelectromechanical system (RF MEMS) switch integrated with a circular patch antenna.
Girija Sravani Kondavitee   +5 more
doaj   +1 more source

Desain dan Implementasi Antena Quadrifilar Helix untuk Komunikasi Antarpulau pada Pita UHF

open access: yesJurnal Rekayasa Elektrika, 2020
Riau Islands, which consists of thousands of islands and is located in the border area of Indonesia, has its own challenges. Based on this strategic geographical location, there are threats and opportunities to develop inter-island information systems ...
Heru Wijanarko   +3 more
doaj   +1 more source

Broadband Three-Section Branch-Line Coupler Realized by Ridge Gap Waveguide Technology From 12 to 20 GHz

open access: yesIEEE Access, 2023
The novel ridge-gap waveguide (RGW) technology which uses an entire metal structure has various advantages at high frequencies, such as broad bandwidth, low loss, low sensitivity to manufacturing errors, and uncomplicated integration with passive and ...
Parisa Mahdavi   +2 more
doaj   +1 more source

Introduzione. Donatori, istituzioni e comunità

open access: yes, 2021
Il saggio esamina criticamente il tema oggetto del volume collettaneo: i benefattori, le motivazioni e le strategie del dare fra Medioevo e prima Età contemporanea.
Edward, Loss, Mauro, Carboni
core   +1 more source

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