In this contribution we present an exact forward solver for a two-dimensional (2D) inhomogeneous dielectric object embedded in a homogeneous background medium. The object is illuminated with a given three-dimensional (3D) time-harmonic incident field. The 3D scattered field is computed in a number of points surrounding the object. The size of the scattering objects can be very large with respect to the wavelength, leading to an extremely high number of unknowns. Therefore a 2.5D configuration is adopted, since it reduces the computational cost while it maintains the capability of accurately studying the system performance. The vector fields are calculated by discretizing a contrast source integral equation with the Method of Moments. The resulting linear system is solved iteratively with a stabilized biconjugate gradient Fast Fourier Transform (BiCGS-FFT) method [1][2]. Simulation and validation results for a number of test objects are shown. Simulation results for test objects will be compared to measurements performed at the VUB, where a free-space active mm-wave imaging system is being developed. The system presently consists of a mm-wave vector network analyzer [3] operating in the 75 to 300 GHz range. It measures the S-parameters in amplitude and phase with a dynamic range of more than 80 dB. At the transmitting side, a horn antenna emits an incident Gaussian beam, which is focused by a lens at the object location. At the receiving side the scattered field is focused by a lens for image formation at a receiving horn antenna. The total distance between transmitting and receiving sides is typically 75 cm.
Van Den Bulcke, S, Franchois, A, Zhang, L & Stiens, J 2006, Modeling a mm-Wave Imaging System with a 2.5D BiCGS-FFT Volume Integral Equation technique. in H Lacoste & L Ouwehand (eds), The European Conference on Antennas and Propagation:. CD-ROM session Diffraction, RCS, Diffraction Inverse, Optimization, Synthesis, ESA Publications Division, Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, Stockholm, Sweden, 21/09/09.
Van Den Bulcke, S., Franchois, A., Zhang, L., & Stiens, J. (2006). Modeling a mm-Wave Imaging System with a 2.5D BiCGS-FFT Volume Integral Equation technique. In H. Lacoste, & L. Ouwehand (Eds.), The European Conference on Antennas and Propagation: (CD-ROM session Diffraction, RCS, Diffraction Inverse, Optimization, Synthesis). ESA Publications Division.
@inproceedings{d940be84ef8a42a28cbd3ba06a42799e,
title = "Modeling a mm-Wave Imaging System with a 2.5D BiCGS-FFT Volume Integral Equation technique",
abstract = "In this contribution we present an exact forward solver for a two-dimensional (2D) inhomogeneous dielectric object embedded in a homogeneous background medium. The object is illuminated with a given three-dimensional (3D) time-harmonic incident field. The 3D scattered field is computed in a number of points surrounding the object. The size of the scattering objects can be very large with respect to the wavelength, leading to an extremely high number of unknowns. Therefore a 2.5D configuration is adopted, since it reduces the computational cost while it maintains the capability of accurately studying the system performance. The vector fields are calculated by discretizing a contrast source integral equation with the Method of Moments. The resulting linear system is solved iteratively with a stabilized biconjugate gradient Fast Fourier Transform (BiCGS-FFT) method [1][2]. Simulation and validation results for a number of test objects are shown. Simulation results for test objects will be compared to measurements performed at the VUB, where a free-space active mm-wave imaging system is being developed. The system presently consists of a mm-wave vector network analyzer [3] operating in the 75 to 300 GHz range. It measures the S-parameters in amplitude and phase with a dynamic range of more than 80 dB. At the transmitting side, a horn antenna emits an incident Gaussian beam, which is focused by a lens at the object location. At the receiving side the scattered field is focused by a lens for image formation at a receiving horn antenna. The total distance between transmitting and receiving sides is typically 75 cm.",
keywords = "Volume Integral, millimmeter wave imaging, BiCGS-FFT, exact forward solver",
author = "{Van Den Bulcke}, Sarah and Ann Franchois and Lixiao Zhang and Johan Stiens",
note = "H. Lacoste & L. Ouwehand; Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet ; Conference date: 21-09-2009 Through 25-09-2009",
year = "2006",
month = nov,
day = "10",
language = "English",
isbn = "92-9092-937-5",
series = "CD-ROM session Diffraction, RCS, Diffraction Inverse, Optimization, Synthesis",
publisher = "ESA Publications Division",
editor = "H. Lacoste and L. Ouwehand",
booktitle = "The European Conference on Antennas and Propagation:",
}