A Fast Approach to Magnetic Equivalent Source Processing Using an Adaptive Quadtree Mesh Discretization

2007 ◽  
Vol 2007 (1) ◽  
pp. 1-4
Author(s):  
Kristofer Davis ◽  
Yaoguo Li
Keyword(s):  
Equivalent Source ◽  
Fast Approach ◽  
Quadtree Mesh

Backscattering Analysis of Cylinder Shaped Scatterer in Vegetation Medium: Comparison Between Theories

2020 ◽  
Vol 2 (1) ◽  
pp. 15-18
Author(s):  
Syabeela Syahali ◽  
Ewe Hong Tat ◽  
Gobi Vetharatnam ◽  
Li-Jun Jiang ◽  
Hamsalekha A Kumaresan
Keyword(s):  
Numerical Solution ◽  
Cross Section ◽  
Traditional Method ◽  
Microwave Remote Sensing ◽  
Solution Model ◽  
Complex Nature ◽  
Good Match ◽  
Equivalent Source ◽  
Backscattering Cross Section ◽  
Method Model

This paper analyses the backscattering cross section of a cylinder both using traditional method model and a new numerical solution model, namely Relaxed Hierarchical Equivalent Source Algorithm (RHESA). The purpose of this study is to investigate the prospect of incorporating numerical solution model into volume scattering calculation, to be applied into microwave remote sensing in vegetation area. Results show a good match, suggesting that RHESA may be suitable to be used to model the more complex nature of vegetation medium.

An efficient hybrid method for analyzing the coupling response of microstrip antenna system

2021 ◽  
pp. 1-14
Author(s):  
Xiao Hu ◽  
Yang Qiu ◽  
Qing-Lin Xu ◽  
Jin Tian
Keyword(s):  
Hybrid Method ◽  
Microstrip Antenna ◽  
Fdtd Method ◽  
Antenna System ◽  
Reciprocity Theorem ◽  
Thin Wire ◽  
Equivalent Source ◽  
Impedance Model ◽  
Antenna Coupling ◽  
Lorentz Reciprocity Theorem

This paper presents an efficient hybrid method consisting of Lorentz reciprocity theorem, finite-difference-time-domain (FDTD) method, thin wire model, transmission line (TL) equations and transfer impedance model, which can be utilized to analyze the system-level transient responses of the microstrip antenna system with antenna, metallic enclosures, braided shielded cable, and lumped element, when illuminated by an external electromagnetic pulse (EMP). In order to avoid over-fine mesh generation and repeated modeling of the antenna in multiple simulations, Lorentz reciprocity theorem is employed to extract an equivalent source model of antenna coupling, thereby improving the computational efficiency. Then, the transfer impedance model and thin wire model are incorporated into the FDTD-TL method efficiently to deal with the back-door coupling through the shielding layer of feeding coaxial cable. Finally, the hybrid FDTD method combined with the extracted equivalent source of antenna coupling is utilized to solve the coupling responses of the whole antenna system. The results of numerical simulation are verified by comparing with the simulation results of CST CS. Then, considering the influence of different incident conditions of external EMP, the characteristics of the coupling response of the system are analyzed. The obtained coupling response information demonstrate that the proposed method is available for further designing electromagnetic protection of the inner circuits of the microstrip antenna system against the impact of external EMP.

A Fast Approach to Best Scanline Search of Airborne Linear Pushbroom Images

2009 ◽  
Vol 75 (9) ◽  
pp. 1059-1067 ◽  
Author(s):  
Mi Wang ◽  
Fen Hu ◽  
Jonathan Li ◽  
Jun Pan
Keyword(s):  
Fast Approach
Sign in / Sign up

Export Citation Format

Share Document