Iterative physical-optics formulation for analyzing large waveguides with lossy walls

Obelleiro, F.; Arajo, M. G.; Rodrguez, J. L.

doi:10.1002/1098-2760(20010105)28:1<21::aid-mop6>3.0.co;2-4

Cited by 26 publications

(8 citation statements)

References 10 publications

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“…An e −jωt dependence is assumed and suppressed. The IPO formulation is given for a cavity with inner walls coated with dielectric materials [13,14]. In such case Leontovitch condition [9] is applied to compute the magnetic current as a function of the electric current such as:…”

Section: Description Of the Ipo Methodsmentioning

confidence: 99%

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Computation of Em Field Scattered by an Open-Ended Cavity and by a Cavity Under Radome Using the Iterative Physical Optics

HÃ©mon¹,

Pouliguen²,

He³

et al. 2008

PIER

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Abstract-It is always a challenge to predict Radar Cross Section (RCS) of a full scale military platform with a good accuracy. Most of the time antennas and cavities are the main contributors of aircrafts RCS. Several methods have been developed to compute the RCS of cavities such as analytical methods (modal methods) and asymptotic methods (geometrical optics (GO) methods and physical optics (PO) methods). This article presents the Iterative Physical Optics (IPO) method which consists in an iterative resolution of the Magnetic Field Integral Equation (MFIE) to compute the currents on the inner walls of the cavity. This method allows computing arbitrarily shaped cavity with a good accuracy even for cavity with a depth inferior to the wavelength. Comparisons of IPO results with Rays and Finite element methods show a better accuracy of IPO than Rays especially for cross polarization. But computation time represents one of the main limitations of the IPO method. We present here a new formulation of the Segmented IPO method which coupled with the generalized reciprocity theorem decreases significantly the complexity of the method and consequently the computation time. The S-IPO method has been validated by comparisons with Modal method and measurements. We have observed that the repartition of the electric currents density on the inner walls of the cavity is quite the same with IPO and S-IPO computations. Lastly we propose an evolution of the IPO method we have developed to compute the RCS of cavities under radome. This method has been validated by comparison with finite element results.

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Section: Description Of the Ipo Methodsmentioning

confidence: 99%

“…In other way asymptotical methods like Ray methods [5,7,8] or Physical Optics methods [11,12] allow to compute RCS of relatively arbitrarily shaped cavities. The method presented here, the Iterative Physical Optics method [12][13][14], is one of these asymptotical methods. The first part recalls the IPO method.…”

Section: Introductionmentioning

confidence: 99%

Computation of Em Field Scattered by an Open-Ended Cavity and by a Cavity Under Radome Using the Iterative Physical Optics

HÃ©mon¹,

Pouliguen²,

He³

et al. 2008

PIER

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“…IPO [24]- [29] is an asymptotic method which consists of an iterative resolution of the Magnetic Field Integral Equation (MFIE). This method is used here to compute the currents over the metallic structure hosting the antenna.…”

Section: Ipo Simulationmentioning

confidence: 99%

“…Hence, we propose here a new hybrid method combining a time-domain AFWM, DG-FDTD [9], and a frequency-domain AM, IPO [24]- [29]. DG-FDTD is a multi-scale time domain method based on FDTD which enables efficient and rigorous wide-band simulations of antennas and their complex vicinity [30].…”

Section: Introductionmentioning

confidence: 99%

A New Hybrid Method for the Analysis of Surrounded Antennas Mounted on Large Platforms

Lepvrier¹,

Loison²,

Gillard³

et al. 2014

IEEE Trans. Antennas Propagat.

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An efficient technique to provide fast and accurate analysis of wide-band surrounded antennas mounted on electrically large platforms is presented and validated in this paper. The hybrid method combines Dual-Grid FDTD (DG-FDTD) with Iterative Physical Optics (IPO) to analyze on-platform antenna radiation. In section IV of this paper, DG-FDTD/IPO is applied to the analysis of a wide-band antenna mounted on a vehicle. The ability to address the problem of antenna placement is also demonstrated.

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“…This is done using the exact dyadic Greens function. Considering the interaction of two facets, the field induced on surface 2 due to the first order currents on surface 1 is calculated using [16] …”

Section: Po/ipo Modelmentioning

confidence: 99%

Millimeter-Wave Doppler Spectrum and Polarimetric Response of Walking Bodies

Vahidpour

Sarabandi

2012

IEEE Trans. Geosci. Remote Sensing

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In this paper, the Doppler spectra of the radar backscatter response of human body and a quadruped are presented at W-band frequencies. This study is motivated by the desire to utilize millimeter-wave radars to detect pedestrians against other targets in the radar scene. The approach is based on dissecting the radar backscatter to isolate the radar returns from different body parts. The forward model is based on an iterative physical optics approach. The complex motion of different parts of walking bodies and their amplitude and range of motion is directly reflected in their radar cross section (RCS) and Doppler spectrum bandwidth. It is shown that the Doppler spectra and RCS differences are sufficient to distinguish a walking human from stationary and other moving objects. Radar polarimetry in conjunction with time-frequency analysis is examined as a method for detecting concealed carried objects. The overall backscatter is decomposed into components associated with the limbs and torso which are then utilized to enhance target detection.Index Terms-Doppler effect, radar cross section (RCS), radar polarimetry.

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Iterative physical-optics formulation for analyzing large waveguides with lossy walls

Cited by 26 publications

References 10 publications

Computation of Em Field Scattered by an Open-Ended Cavity and by a Cavity Under Radome Using the Iterative Physical Optics

Computation of Em Field Scattered by an Open-Ended Cavity and by a Cavity Under Radome Using the Iterative Physical Optics

A New Hybrid Method for the Analysis of Surrounded Antennas Mounted on Large Platforms

Millimeter-Wave Doppler Spectrum and Polarimetric Response of Walking Bodies

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