scholarly journals High Frequency Techniques: the Physical Optics Approximation and the Modified Equivalent Current Approximation (MECA)

10.5772/17307 ◽  
2011 ◽  
Author(s):  
Javier Gutierrez-Meana ◽  
Jose A. ◽  
Fernando Las-Heras
Keyword(s):  
High Frequency ◽  
Physical Optics ◽  
Equivalent Current ◽  
Physical Optics Approximation ◽  
Current Approximation

The scaled RCS measurement method for lossy targets via dynamically matching the reflection coefficients in the THz band

2021 ◽  
Author(s):  
Shuang Pang ◽  
Yang Zeng ◽  
Qi Yang ◽  
Bin Deng ◽  
Hong-Qiang Wang
Keyword(s):  
Cross Section ◽  
High Frequency ◽  
Measurement Method ◽  
Dielectric Material ◽  
Frequency Estimation ◽  
Estimation Method ◽  
Physical Optics ◽  
Reflection Coefficients ◽  
Effective Solution ◽  
Terahertz Band

Abstract In the terahertz band, the dispersive characteristic of dielectric material is one of the major problems in the scaled radar cross section (RCS) measurement, which is inconsistent with the electrodynamics similitude deducted according to the Maxwell’s equations. Based on the high-frequency estimation method of physical optics (PO), a scaled RCS measurement method for lossy objects is proposed through dynamically matching the reflection coefficients according to the distribution of the object’s facets. Simulations on the model of SLICY were conducted, the inversed RCS of the lossy prototype was obtained using the proposed method. Via comparing the inversed RCS with the calculated results, the validity of the proposed method is demonstrated. The proposed method provides an effective solution to the scaled RCS measurement for lossy objects in the THz band.

scholarly journals Reflexionseigenschaften von Windenergieanlagen im Funkfeld von Funknavigations- und Radarsystemen

2015 ◽  
Vol 13 ◽  
pp. 9-18 ◽  
Author(s):  
S. Sandmann ◽  
S. Divanbeigi ◽  
H. Garbe
Keyword(s):  
High Frequency ◽  
Physical Optics ◽  
Very High Frequency ◽  
Radio Range ◽  
Multi Level ◽  
Very High

Abstract. Die hier behandelte Untersuchung befasst sich mit den Störungen des elektrischen Feldes einer Doppler Very High Frequency Omnidirectional Radio Range Navigationsanlage (DVOR) in der Gegenwart von Windenergieanlagen (WEA). Hierfür wird die Feldstärke auf 25 konzentrischen Kreisbahnen, sog. Orbit Flights verschiedener Höhen und mit verschiedenen Radien rund um die DVOR-Anlage numerisch simuliert. Insbesondere werden die Einflüsse diverser Parameter der WEA wie deren Anzahl, Position, Rotorwinkel, Turmhöhe und Rotordurchmesser auf die Feldverteilung herausgestellt, sowie die Anwendbarkeit der Simulationsmethode Physical Optics (PO) durch Vergleich der Simulationsergebnisse mit denen der Multi Level Fast Multipol Method (MLFMM) untersucht.

scholarly journals THE MULTILEVEL FAST PHYSICAL OPTICS METHOD FOR CALCULATING HIGH FREQUENCY SCATTERED FIELDS

2020 ◽  
Vol 169 ◽  
pp. 1-15
Author(s):  
Zhiyang Xue ◽  
Yu Mao Wu ◽  
Weng Cho Chew ◽  
Ya-Qiu Jin ◽  
Amir Boag
Keyword(s):  
High Frequency ◽  
Physical Optics ◽  
Scattered Fields

Light scattering by ice crystals of cirrus clouds: From exact numerical methods to physical-optics approximation

2017 ◽  
Vol 195 ◽  
pp. 132-140 ◽  
Author(s):  
Alexander Konoshonkin ◽  
Anatoli Borovoi ◽  
Natalia Kustova ◽  
Hajime Okamoto ◽  
Hiroshi Ishimoto ◽  
...  
Keyword(s):  
Light Scattering ◽  
Numerical Methods ◽  
Cirrus Clouds ◽  
Ice Crystals ◽  
Physical Optics ◽  
Physical Optics Approximation

Shadow Radiation Iterative Physical Optics Method for High-Frequency Scattering

2018 ◽  
Vol 66 (2) ◽  
pp. 871-883 ◽  
Author(s):  
Igor Gershenzon ◽  
Yaniv Brick ◽  
Amir Boag
Keyword(s):  
High Frequency ◽  
Physical Optics
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