نتایج جستجو برای: microwave absorber

تعداد نتایج: 58612  

2017
Dengyang Guo Davide Bartesaghi Haotong Wei Eline M Hutter Jinsong Huang Tom J Savenije

In view of its band gap of 2.2 eV and its stability, methylammonium lead bromide (MAPbBr3) is a possible candidate to serve as a light absorber in a subcell of a multijunction solar cell. Using complementary temperature-dependent time-resolved microwave conductance (TRMC) and photoluminescence (TRPL) measurements, we demonstrate that the exciton yield increases with lower temperature at the exp...

Journal: :Materials research express 2022

Abstract In this paper, an ultra-broadband flexible polarization-insensitive microwave metamaterial absorber is proposed, characterized, and fabricated. To achieve high broadband absorption, a two-layer periodic indium-tin-oxide (ITO) patches array printed on polyethylene terephthalate (PET) dielectric layers used to generate ohmic loss. The simulation results show that the proposed can greater...

Journal: :Basic and Applied Sciences - Scientific Journal of King Faisal University 2021

2004
M. C. Wu Y. K. Chen

Sub-picosecond optical pulses have been successfully generated using a novel monolithic passive colliding pulse mode-locked (CPM)l semiconductor multiple quantum-well (MQW) laser. Transform-limited pulse width of 830 femto-seconds is achieved at a wavelength of 1.5pm and a repetition rate of 80 GHz. The measured timebandwidth product is 0.31. A record high repetition rate of 350 GHz is also dem...

2017
Candice Ellison Murat Sean McKeown Samir Trabelsi Dorin Boldor

Material dielectric properties are important for understanding their response to microwaves. Carbonaceous materials are considered good microwave absorbers and can be mixed with dry biomasses, which are otherwise low-loss materials, to improve the heating efficiency of biomass feedstocks. In this study, dielectric properties of pulverized biomass and biochar mixtures are presented from 0.5 GHz ...

2005
Jia-Sheng Hong Hussein Shaman

An ultra-wideband (UWB) microstrip filter with a fractional bandwidth (FBW) of more than 100% is designed and demonstrated. This UWB microstrip-filter design is based on a circuit model for an optimum short-circuited stub transmission-line filter whose unit Figure 4 Reflection coefficient of the ultra-thin absorber: (a) simulated reflection coefficient; (b) measured reflection coefficient; (c) ...

Journal: :Chinese Journal of Electronics 2023

In this paper, the structure optimization scheme of multi-layer absorber on surface human tissue is designed. The uses graphite, foam and other materials to build a resistance loss layer. Solve electromagnetic parameters graphite through its characteristics, use equivalent transmission line theory calculate reflection coefficient. Establish objective function coefficient, genetic algorithm opti...

Journal: :Journal of visualized experiments : JoVE 2012
James P Grant Iain J H McCrindle David R S Cumming

Metamaterials (MM), artificial materials engineered to have properties that may not be found in nature, have been widely explored since the first theoretical(1) and experimental demonstration(2) of their unique properties. MMs can provide a highly controllable electromagnetic response, and to date have been demonstrated in every technologically relevant spectral range including the optical(3), ...

Journal: :Journal of the Optical Society of America. A, Optics, image science, and vision 2014
Akito Kusaka Edward J Wollack Thomas R Stevenson

High-sensitivity receiver systems with near-ideal polarization sensitivity are highly desirable for development of millimeter and submillimeter radio astronomy. Multimoded bolometers provide a unique solution to achieve such sensitivity, for which hundreds of single-mode sensors would otherwise be required. The primary concern in employing such multimoded sensors for polarimetery is the control...

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