A Phaseless Gauss-Newton Inversion Algorithm for Imaging and Design

Narendra, Chaitanya; Mojabi, Puyan

doi:10.23919/eucap48036.2020.9135396

Cited by 2 publications

(12 citation statements)

References 29 publications

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“…1. 1 The surface electromagnetic equivalence principle. The original problem (left) where a true source (can include more than one radiator) is bounded by an arbitrary surface S and is radiating the true electromagnetic field ( E 0 and H 0 ) can be replaced with an equivalent problem (right) where the same field ( E 0 and H 0 ) is being radiated outside S but the field inside S ( E 1 and H 1 ) can be arbitrary.…”

Section: List Of Figuresmentioning

confidence: 99%

Section: List Of Figuresmentioning

confidence: 99%

“…Antennas 2 energy use and storage, which is useful for cases where the antenna needs to be seen as a lumped element in a larger circuit/network. 1 However, in this work we are interested in characterizing and designing radiators with respect to their spatial properties.…”

Section: Antennasmentioning

confidence: 99%

“…According to (2.5), if one knows the incident, reflected, and desired transmitted fields on the metasurface boundaries, we can use the GSTCs to calculate the surface susceptibility profile that is required to implement the metasurface. 1 However, the desired transmitted field is not always known on the output boundary of the metasurface. For example, in many applications such as mobile communication, the far-field radiation pattern of the antenna is most important.…”

Section: Metasurface Design Using Inverse Sourcementioning

confidence: 99%

“…As was previously shown in [2], it is often beneficial to be able to make use of a variety of electromagnetic data to solve for the property of interest. To this end, in [82] we briefly explored using the phaseless Gauss-Newton inversion algorithm that was developed for Chapter 4 for dielectric lens design. However, to further increase the variety of electromagnetic data that is available for use in the inversion process and to increase the capability of the dielectric lens/antenna designer, in Chapter 5 we present a novel combined inverse source and scattering technique to design dielectric lens antennas.…”

Section: Dielectric Lens/antenna Design: Design By Volumetric Currentsmentioning

confidence: 99%

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Multi-Plane Magnetic Near-Field Data Inversion Using the Source Reconstruction Method

Narendra

Brown

Bayat

et al. 2018

2018 18th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM)

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In this work, we use the electromagnetic inversion (EI) framework to develop/improve algorithms for the purpose of antenna design and characterization. Broadly speaking, antennas are any device, object, or system that can transform energy in the form of guided waves to energy in the form of radiated waves in space. In our increasingly wireless technology landscape, many different types of antennas are being analyzed and developed for a variety of applications. Therefore a flexible design/characterization methodology is required to support our future wireless engineering needs.To this end, we employ an EI methodology that allows the flexibility to develop novel antenna characterization and design algorithms in a variety of applications. In general, electromagnetic inversion enables the determination of an electromagnetic property of interest (e.g., relative permittivity or equivalent current distribution) in an investigation domain by processing some type of electromagnetic data (e.g., complex electric field, phaseless data, or far-field performance criteria) on a separate measurement/desired data domain wherein the investigation and data domains can be arbitrarily shaped; our methodology allows for this flexibility to be utilized. Through the use of this methodology and the electromagnetic surface and volume equivalence principles we develop EI algorithms to contribute to the areas of metasurface design, microwave imaging, and dielectric lens/antenna design. Specifically, (i) we develop and demonstrate a gradient-based EI algorithm that can directly design the circuit admittance profiles of metasurfaces from desired complex or phaseless (magnitude-only) magnetic field data on an external data domain, (ii) we develop and verify inverse scattering algorithms to reconstruct dielectric profiles from phaseless synthetic and experimentally measured data, and finally (iii) we introduce a combined inverse source and scattering technique to tailor electromagnetic fields by designing passive, lossless, and reflectionless dielectric profiles to transform an existing electromagnetic field distribution from a known feed to one that satisfies desired far-field performance criteria such as main beam directions, null locations, and half-power beamwidth. First, I would like thank my advisor and friend Dr. Puyan Mojabi for his guidance throughout my academic journey and for inspiring me to begin the journey in the first place all those years ago in his antennas course at the end of my B.Sc. Thanks also to my friends and colleagues Dr. Trevor Brown, Chen Niu, and Dr. Nozhan Bayat for making my time at the University of Manitoba an absolute joy. I would like to express my gratitude to my Ph.D. internal committee members Dr. Ian Jeffrey, Dr. Jason Fiege, and my external committee member Dr. Andrea Massa for taking the time to help me improve my thesis. Lastly, I'd like to thank the

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Section: List Of Figuresmentioning

confidence: 99%

Section: List Of Figuresmentioning

confidence: 99%

Section: Antennasmentioning

confidence: 99%

Section: Metasurface Design Using Inverse Sourcementioning

confidence: 99%

Section: Dielectric Lens/antenna Design: Design By Volumetric Currentsmentioning

confidence: 99%

See 3 more Smart Citations