Advanced Helicopter Electromagnetics: industry, government and university

Balanis, C.A.; Sun, Weimin; Tirkas, P.A.; Barber, G. C.

doi:10.1109/milcom.1994.473848

Cited by 91 publications

(158 citation statements)

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“…We do so because the PO approximation is commonly used in Fourier and statistical optics to predict the scattering (or diffraction patterns) from apertures in opaque screens [34,38]. It is well known that the PO approximation returns inaccurate results for wavelength-scale apertures [29][30][31]. Later, we show that it also returns inaccurate results for spatially incoherent incident fields, regardless of aperture size.…”

Section: Po Solutionsmentioning

confidence: 92%

“…Returning briefly to figure 1, by applying Love's equivalence theorem and image theory [29][30][31], we transform the aperture geometry into an equivalent one, in which a magnetic current  radiates in unbounded space. This current is unknown, and we derive an equation for  in terms of the incident field by enforcing the continuity of the transverse magnetic field in the slit, namely,…”

Section: Mfiesmentioning

confidence: 99%

“…The remaining symbols in equation (2) are H inc , which is the incident magnetic field, and F , which is the electric vector potential [29,30]. F contains  and is given by the integral expression…”

Section: Mfiesmentioning

confidence: 99%

“…Here, we briefly present the PO solutions [29][30][31]38] to the aperture problem depicted in figure 1. We do so because the PO approximation is commonly used in Fourier and statistical optics to predict the scattering (or diffraction patterns) from apertures in opaque screens [34,38].…”

Section: Po Solutionsmentioning

confidence: 99%

“…In this paper, we derive the transverse magnetic (TM) and transverse electric (TE) expressions for the crossspectral density (CSD) function [18,28] in the aperture using electromagnetic (EM) theory and the commonly used physical optics(PO) approximation [29][30][31]. In the former case, we apply Love's equivalence theorem and image theory [29][30][31], and enforce the continuity of transverse aperture fields to derive a magnetic field integral equation (MFIE) for the unknown equivalent magnetic current (proportional to the electric field in the aperture). Then, using the Method of Moments(MoM) [30,32,33], we numerically solve for the CSD of this current.…”

Section: Introductionmentioning

confidence: 99%

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Near-field effects on partially coherent light scattered by an aperture

Hyde

Havrilla

2019

J. Phys. Commun.

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We investigate how the near field affects partially coherent light scattered from an aperture in an opaque screen. Prior work on this subject has focused on the role of surface plasmons, and how they affect spatial coherence is well documented. Here, we consider other near-field effects that might impact spatial coherence. We do this by examining the statistics of the near-zone field scattered from an aperture in a perfect electric conductor plane-a structure that does not support surface plasmons. We derive the near-field statistics (in particular, cross-spectral density functions) by applying electromagnetic equivalence theorems and the Method of Moments. We find, even in the absence of surface plasmons, that near-field physics can affect the coherence of the scattered field. The analysis and findings presented herein complement the existing coherence-related surface plasmons literature, and could find use in the design of photonic devices built to engineer spatial coherence.

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Section: Po Solutionsmentioning

confidence: 92%

Section: Mfiesmentioning

confidence: 99%

Section: Mfiesmentioning

confidence: 99%

Section: Po Solutionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Near-field effects on partially coherent light scattered by an aperture

Hyde

Havrilla

2019

J. Phys. Commun.

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Sensitivity of Resonant Axion Haloscopes to Quantum Electromagnetodynamics

et al. 2023

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Recently, interactions between putative axions and magnetic monopoles have been revisited by two of the authors.[1] It is shown that significant modifications to conventional axion electrodynamics arise due to these interactions, so that the axion–photon coupling parameter space is expanded from one parameter to three . Poynting theorem is implemented to determine how to exhibit sensitivity to and using resonant haloscopes, allowing new techniques to search for axions and a possible indirect way to determine if magnetically charged matter exists.

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Dual wideband high‐efficient reflective linear‐to‐dual‐circular dual‐rotational polarization converter with two complementary twin‐split square‐ring resonators

Zaker

2024

Int J Communication

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SummaryA high‐efficient linear‐to‐circular polarization (LP‐to‐CP) converter with dual‐band, dual‐rotational‐direction reflectivity using a single‐layer selective surface (FSS) with a thickness of at 3.5 GHz is designed and investigated. The unit cell, measuring 8 mm × 8 mm ( at 3.5 GHz), consists of two dual‐slotted square rings, with the outer ring providing two nonadjacent CP bands with two reflective resonances in each. The inner ring, with a 90° rotation and the ability to create different polarization and phase behavior, obtains two wide bands with high CP quality. Parametric studies and optimal results show an interesting fact that incident x(y)‐direction LP wave is effectively converted into right‐hand CP, that is, RHCP (left‐hand CP, i.e., LHCP) wave at the former band and into LHCP (RHCP) at the later band. Finally, a practical 10 × 10 optimal array is fabricated which offers excellent axial ratio below 2 dB over two wide bandwidths: 3.46 to 5.96 GHz (53%: S and C bands) and 7.8 to 12.2 GHz (44%: X band). The converter is angularly stable over 45° and 30° in the stated bands, respectively. A good agreement between simulation and measurement and essential comparisons with literature are also proposed. The results demonstrate significant potential for different dual‐band CP applications with simultaneous isolated uplink and downlink.

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Advanced Helicopter Electromagnetics: industry, government and university

Cited by 91 publications

References 0 publications

Near-field effects on partially coherent light scattered by an aperture

Near-field effects on partially coherent light scattered by an aperture

Sensitivity of Resonant Axion Haloscopes to Quantum Electromagnetodynamics

Dual wideband high‐efficient reflective linear‐to‐dual‐circular dual‐rotational polarization converter with two complementary twin‐split square‐ring resonators

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