Results 1 to 10 of about 178,445 (221)

Parabolic Equation Modeling of Electromagnetic Wave Propagation over Rough Sea Surfaces [PDF]

Sensors, 2019
The parabolic equation is an efficient numerical solution for electromagnetic wave propagation. In order to address the difficulties in predicting electromagnetic wave propagation in the maritime environment caused by atmospheric dust and rough sea ...
Ying Gao, Qun Shao, Binzhou Yan, Qifan Li, Shuxia Guo   +4 more
doaj   +2 more sources

Balanced‐to‐unbalanced and balanced‐to‐balanced filtering rat‐race couplers using multilayer substate integrated waveguide cavities

IET Microwaves, Antennas & Propagation, 2021
This study reports a class of balanced‐to‐unbalanced (BTU) and balanced‐to‐balanced (BTB) filtering rat‐race couplers (FRCs) based on multilayer substrate integrated waveguide (SIW) cavities.
Xian Wang, Dongfang Zhou, Dewei Zhang, Yue Wang, Dalong Lv, Yi Zhang   +5 more
doaj   +1 more source

Design of a polarization selective surface for co‐channel interference suppression

Electronics Letters, 2022
In this paper, a novel design of polarization selective surface (PSS) is proposed for co‐channel interference (CCI) suppression. By establishing a switchable doublet topology, two types of second‐order filtering responses with two transmission zeros are ...
Xian Wang, Yue Wang, Qikun Liu, Dongfang Zhou, Dalong Lv   +4 more
doaj   +1 more source

Incoherent scatter radar (ISR) observations of high-frequency enhanced ion and plasma lines induced by X/O mode pumping around the critical altitude

Earth and Planetary Physics, 2022
Analysis of Incoherent Scatter Radar (ISR) data collected during an experiment involving alternating O/X mode pumping reveals that the high-frequency enhanced ion line (HFIL) and plasma line (HFPL) did not appear immediately after the onset of pumping ...
Jun Wu, Jian Wu, I. Haggstrom, Tong Xu, ZhengWen Xu, YanLi Hu   +5 more
doaj   +1 more source

Single‐ and triple‐band bandpass filters using novel perturbed isosceles right‐angled triangular SIW cavities

IET Microwaves, Antennas & Propagation, 2021
Herein, a rigorous derivation of an isosceles right‐angled triangular (IRT) metallic cavity is analysed. Then, the transverse field components in the IRT substrate‐integrated waveguide (SIW) cavity are derived, and the expression of the resonant ...
Junjie Zhang, Qing Liu, Dongfang Zhou, Dewei Zhang   +3 more
doaj   +1 more source

Research and application of high-resolution micro-cylindrically focused logging tool

Frontiers in Earth Science, 2023
The unknown nature and complexity of non-uniform formations cause new difficulties and challenges to the accurate detection of electrical instruments in shallow formations.
Jigen Xia, Jigen Xia, Zhiqiang Li, Zhiqiang Li, Yongli Ji, Yongli Ji, Hengrong Zhang, Fangong Li, Fangong Li, Junyi Li, Junyi Li, Xingmeng Dong, Xingmeng Dong   +12 more
doaj   +1 more source

Design of high roll‐off frequency selective surface based on single‐layer SIW cavity with fully canonical filtering responses

Electronics Letters, 2022
In this paper, a novel design of high roll‐off frequency selective surface (FSS) is proposed based on a single‐layer substrate integrated waveguide (SIW) cavity.
Xian Wang, Dongfang Zhou, Yue Wang, Qikun Liu, Na An   +4 more
doaj   +1 more source

High Selectivity Single Wideband and Quad-Band HTS Filters Using Novel Quad-Mode Resonators With Self-Coupled Structure

IEEE Access, 2021
This paper presents improved quad-mode resonators based on the open/short-end load of the center stub, which introduces the self-coupled structure. Compared with the traditional stub-loaded stepped impedance resonator (SLSIR), the proposed quad-mode ...
Junjie Zhang, Qing Liu, De-Wei Zhang, Ying Qu   +3 more
doaj   +1 more source

Application of Semi-Airborne Frequency Domain Electromagnetic Data Based on Improved Ant-Colony-Optimized Wavelet Threshold Denoising Method

IEEE Access, 2022
The semi-airborne frequency domain electromagnetic detection method is a popular electromagnetic detection method in which the transmission system is excited on the ground and the reception system coil is in the air to measure the vertical magnetic field
Jigen Xia, Ximei Qiao, Zhiqiang Li, Jian Wu, Xingmeng Dong, Yuwen Zhai   +5 more
doaj   +1 more source

Dielectric permittivity of dusty plasma in the Earth's mesosphere

Earth and Planetary Physics, 2021
This paper deals with the dielectric permittivity of dusty plasma in the earth’s mesosphere. We give expressions for the complex dielectric permittivity of dusty plasma, taking into account the effects of the dust charging process and magnetic field.
Hui Li, Jian Wu
doaj   +1 more source