Zobrazeno 1 - 10
of 3 316
pro vyhledávání: '"Roll-off"'
Publikováno v:
ETRI Journal, Vol 46, Iss 4, Pp 716-726 (2024)
An ultrawide stopband lowpass filter is reported using three stepped impedance resonators with high selectivity. The filter extends the stopband frequency range and attenuation, and two quarter-wave open stubs and three circular ground slots are intr
Externí odkaz:
https://doaj.org/article/235372e0c74e40e2b2c2436004904798
Publikováno v:
Advanced Science, Vol 11, Iss 46, Pp n/a-n/a (2024)
Abstract The application of quantum‐dot light‐emitting diodes (QLEDs) is hindered by efficiency roll‐off at high current densities. Factors contributing to this roll‐off include Auger recombination, electric field‐induced quenching, Joule h
Externí odkaz:
https://doaj.org/article/40e0d53de3914cd3b73e59966b91c98d
Publikováno v:
IEEE Access, Vol 12, Pp 8924-8931 (2024)
This article presents an optimized dual-polarized transmitarray antenna (TA) designed for MIMO applications at the Ka-band, capable of switching beams in two directions. The antenna aperture uses a small unit cell with three layers of Taconic RF-35 d
Externí odkaz:
https://doaj.org/article/6cb798fcfe8f4af699b7372c232466b1
Autor:
David Dunkerley
Publikováno v:
Methods in Ecology and Evolution, Vol 14, Iss 12, Pp 3047-3054 (2023)
Abstract Leaf wettability and drainage characteristics of different taxa are often hypothesised to have emerged as a result of evolutionary selection, perhaps to limit the duration of leaf wetness, or to direct water toward efficiently to the soil an
Externí odkaz:
https://doaj.org/article/f024f91c52644688b39409074f3499d2
Autor:
P. S. Tomar, M. S. Parihar
Publikováno v:
Radioengineering, Vol 32, Iss 3, Pp 408-414 (2023)
In this work, an ultra-wide stopband low pass filter (LPF) with high selectivity is proposed using coupled stepped impedance resonators (SIRs), open shunt stubs and circular slots in the ground plane. The proposed LPF has been modeled using a lumped
Externí odkaz:
https://doaj.org/article/1109d048c97d49e5b9f8c9597555c322
Analysis and Design of a 2-40.5 GHz Low Noise Amplifier With Multiple Bandwidth Expansion Techniques
Publikováno v:
IEEE Access, Vol 11, Pp 13501-13509 (2023)
This paper analyzes the main factors limiting the bandwidth expansion of low-noise amplifiers (LNA) and designs a broadband LNA with a bandwidth of 2-40.5 GHz. The LNA is designed using multiple bandwidth expansion methods, including cascode, resista
Externí odkaz:
https://doaj.org/article/ce2d5bec01044b198f3729989c52d5d7
Autor:
Yu‐Kuan Lin, Chiung‐Han Chen, Yen‐Yu Wang, Ming‐Hsuan Yu, Jing‐Wei Yang, I‐Chih Ni, Bi‐Hsuan Lin, Ivan S. Zhidkov, Ernst Z. Kurmaev, Yu‐Jung Lu, Chu‐Chen Chueh
Publikováno v:
Advanced Science, Vol 10, Iss 26, Pp n/a-n/a (2023)
Abstract Quasi‐2D perovskites have recently flourished in the field of luminescence due to the quantum‐confinement effect and the efficient energy transfer between different n phases resulting in exceptional optical properties. However, owing to
Externí odkaz:
https://doaj.org/article/b1a3dc54fab145568ce0f23c58650bd4
Publikováno v:
Frontiers in Physics, Vol 11 (2023)
Simulations have become increasingly important to understand and design organic optoelectronic devices, such as organic light emitting diodes (OLEDs) and to optimize their performance by selecting appropriate materials and layer arrangements. To achi
Externí odkaz:
https://doaj.org/article/cb38312a322547c3a69106e4e1d87c6f
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