Results 21 to 30 of about 127,201 (278)

An ultra-thin absorber in microwave range: 50 GHz band-width, absorption over 80 %

Memories - Materials, Devices, Circuits and Systems, 2023
An ultra-thin microwave absorber with a 34 GHz bandwidth more than 90% absorption in the frequency range of 33.5 GHz - 67.5 GHz, and 50 GHz bandwidth, more than 80 % absorption is proposed. The functionality of the device was analyzed using an equivalent
Ilghar Rezaei, Behnaz Rashidi, Amir Ali Mohammad Khani, Toktam Aghaee   +3 more
doaj   +1 more source

Parametrical synthesis of dynamic links for variants of their inclusion between a nonlinear part and loading of automatic systems of radio management with the general feedback

Физика волновых процессов и радиотехнические системы, 2022
Introduction: the analysis of the known literature shows that the use of various types of matching quadripoles (reactive, resistive, complex, mixed) and the feedback circuit covering the non-linear element makes it possible to increase the area of ...
Alexander A. Golovkov, Vladimir A. Golovkov   +1 more
doaj   +1 more source

Parametrical synthesis of the complex two-port networks for variants of their inclusion between a source of a signal and a nonlinear part by criterion of maintenance of the set characteristics amplifiers with the general feedback

Физика волновых процессов и радиотехнические системы, 2022
Introduction: the analysis of known literature shows that the use of various types of matching quadripoles (reactive, resistive, complex, mixed) and a feedback circuit covering a non-linear element makes it possible to increase the area of physical ...
Alexander A. Golovkov, Vladimir A. Golovkov   +1 more
doaj   +1 more source

The Design Method of the Active Negative Group Delay Circuits Based on a Microwave Amplifier and an RL-Series Network

IEEE Access, 2018
This paper addresses a circuit theory regarding the negative group delay (NGD) principle. The methodology for characterizing this unfamiliar NGD function is described.
Fayu Wan, Ningdong Li, Blaise Ravelo, Qizheng Ji, Binhong Li, Junxiang Ge   +5 more
doaj   +1 more source

S-Parameter Model of Three Parallel Interconnect Lines Generating Negative Group-Delay Effect

IEEE Access, 2018
This paper develops a negative group-delay (NGD) microwave circuit theory regarding topology consists of three parallel interconnect lines (3-PILs). The NGD topology under study is built using completely distributed microstrip lines. The 3-PIL NGD theory
Fayu Wan, Ningdong Li, Blaise Ravelo, Qizheng Ji, Junxiang Ge   +4 more
doaj   +1 more source

Polarization-independent symmetrical digital metasurface absorber

Results in Physics, 2021
A metasurface absorber developed using binary-coded unit cells and with the combination of coded unit cells resulted in excellent polarization insensitiveness, symmetrical characteristics, and tunable characteristics. As for binary patterns using the ‘0’
Ahmed Mahfuz Tamim, Md Mehedi Hasan, Mohammad Rashed Iqbal Faruque, Mohammad Tariqul Islam, Jamel Nebhen   +4 more
doaj   +1 more source

Quantum electrodynamics with magnetic textures

New Journal of Physics, 2019
Coherent exchange between photons and different matter excitations (like qubits, acoustic surface waves or spins) allows for the entanglement of light and matter and provides a toolbox for performing fundamental quantum physics.
María José Martínez-Pérez, David Zueco   +1 more
doaj   +1 more source

Design of GaN-based input harmonic control RF power amplifier

Dianzi Jishu Yingyong, 2021
The influence of input harmonic control theory on the performance of power amplifier efficiency is qualitatively analyzed. At the same time, the 0.25 ?滋m GaN HEMT device from Nanjing Institute of Electronic Devices was selected, and the load pull test ...
Shao Yuwei, Tao Hongqi
doaj   +1 more source

An ultra-broadband flexible polarization-insensitive microwave metamaterial absorber

Materials Research Express, 2022
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 ...
Huihui Jing, Junping Duan, Yiqing Wei, Jingxian Hao, Zeng Qu, Jiayun Wang, Binzhen Zhang   +6 more
doaj   +1 more source

Attenuation of microwave transmission in a diameter-variable drill string bore

Petroleum Exploration and Development, 2018
: With the drill string hole being regarded as an ultra-long irregular lossy cylindrical waveguide, the optimal frequency point for microwave transmission was calculated according to the electromagnetic wave coupling theory, the attenuation law and ...
Wenhe XIA, Yingfeng MENG, Bo TANG, Wenting GUAN   +3 more
doaj   +1 more source