<i>Electromagnetics</i>, 2nd ed.

Kraus, John; Carver, K.; Burns, Stephen H.

doi:10.1119/1.10886

Cited by 31 publications

(45 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A traditional antenna metric that particularly succinctly captures these constraints is the frequency dependence of the standing-wave ratio (SWR, see, e.g., Chapter 10-6 of Kraus & Carver 1973). The amplitude of spectral features in the SWR for the antenna signal path must be kept sufficiently small such that, when the antenna response multiplies the power density of correlated foreground emission between two antennas, the leakage into delay modes of interest is much smaller than the expected 21 cm reionization signal.…”

Section: Mapping Foregrounds To K-spacementioning

confidence: 99%

A PER-BASELINE, DELAY-SPECTRUM TECHNIQUE FOR ACCESSING THE 21 cm COSMIC REIONIZATION SIGNATURE

Parsons

Pober

Aguirre

et al. 2012

ApJ

303

458

View full text Add to dashboard Cite

A critical challenge in measuring the power spectrum of 21 cm emission from cosmic reionization is compensating for the frequency dependence of an interferometer's sampling pattern, which can cause smooth-spectrum foregrounds to appear unsmooth and degrade the separation between foregrounds and the target signal. In this paper, we present an approach to foreground removal that explicitly accounts for this frequency dependence. We apply the delay transformation introduced in Parsons & Backer to each baseline of an interferometer to concentrate smooth-spectrum foregrounds within the bounds of the maximum geometric delays physically realizable on that baseline. By focusing on delay modes that correspond to image-domain regions beyond the horizon, we show that it is possible to avoid the bulk of smooth-spectrum foregrounds. We map the point-spread function of delay modes to k-space, showing that delay modes that are uncorrupted by foregrounds also represent samples of the three-dimensional power spectrum, and can be used to constrain cosmic reionization. Because it uses only spectral smoothness to differentiate foregrounds from the targeted 21 cm signature, this per-baseline analysis approach relies on spectrally and spatially smooth instrumental responses for foreground removal. For sufficient levels of instrumental smoothness relative to the brightness of interfering foregrounds, this technique substantially reduces the level of calibration previously thought necessary to detect 21 cm reionization. As a result, this approach places fewer constraints on antenna configuration within an array, and in particular, facilitates the adoption of configurations that are optimized for power-spectrum sensitivity. Under these assumptions, we demonstrate the potential for the Precision Array for Probing the Epoch of Reionization (PAPER) to detect 21 cm reionization at an amplitude of 10 mK 2 near k ∼ 0.2 h Mpc −1 with 132 dipoles in 7 months of observing.

show abstract

Section: Mapping Foregrounds To K-spacementioning

confidence: 99%

A PER-BASELINE, DELAY-SPECTRUM TECHNIQUE FOR ACCESSING THE 21 cm COSMIC REIONIZATION SIGNATURE

Parsons

Pober

Aguirre

et al. 2012

ApJ

303

458

View full text Add to dashboard Cite

show abstract

“…From classical theory, the transmission of light through a circular aperture decays exponential with material thickness and is well described using a cylindrical model for d ≤ 0.586λ [22]. For example, an aperture with a diameter of d = 200 µm, which represents one of our fabricated devices, has an attenuation constant of α = 17.09 mm −1 at λ = 922 µm.…”

Section: Transmission Through the Aperturementioning

confidence: 99%

Enhanced Terahertz Transmission Through Bullseye Plasmonics Lenses Fabricated Using Micromilling Techniques

et al. 2016

View full text Add to dashboard Cite

Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Enhanced terahertz transmission through bullseye plasmonics lenses fabricated using micromilling techniques Heggie, Tanner J.; Naylor, David A.; Gom, Brad G.; Bordatchev, Evgueni; Trimboli, M. Grace http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=fr L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21277263&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21277263&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1007/s11468-015-0152-7 Abstract Imaging applications at terahertz frequencies are, in general, limited to relatively low spatial resolution due to the effects of diffraction. By using a subwavelength aperture in the near-field, however, it is possible to achieve subwavelength resolution, although low transmission through the aperture limits the sensitivity of this approach. Plasmonic lenses in the form of bullseye structures, which consist of a circular subwavelength aperture surrounded by concentric periodic corrugations, have demonstrated enhanced transmission, thereby increasing the utility of near-field imaging configurations. In this paper, the design, fabrication, and experimental performance of plasmonic lenses optimized for 300 GHz are discussed. While nanofabrication techniques are required for optical applications, microfabrication techniques are sufficient for terahertz applications. The process flow for fabricating a double-sided bullseye structure using a precision micromilling technique is described. Transmission and beam profile measurements using a customized t...

show abstract

“…Faraday's law basically states that if a wire or solenoid is being moved across the lines of magnetic field then electromotive force will be induced in it [1,5]. This law has been proved to be true.…”

Section: Simple Experiments Proving Faraday's Law Of Inductionmentioning

confidence: 99%

“…1 (a), then the flux density through the alternative channels should be inversely proportional to the ratio of the sum of the surface areas of both channels towards the surface area of the magnet. This statement means that if for example a magnet has a magnetic flux Ф M (3), flux density B M and cross sectional area S M and if its stationary magnetic flux is divided to flow trough two different high permeability pathways with summary surface area 2A E four times larger than that of the magnet (4), then the flux density B C in any one of the two pathways should be four times lower (5).…”

Section: Core Magnetic Flux Density Measurementsmentioning

confidence: 99%

Ways of Switching of Static Magnetic Field and Its Influence Over the Work Parameters of Magnetic Circuits

Keseev¹

2014

IJRET

View full text Add to dashboard Cite

show abstract

Electromagnetics, 2nd ed.

Cited by 31 publications

References 0 publications

A PER-BASELINE, DELAY-SPECTRUM TECHNIQUE FOR ACCESSING THE 21 cm COSMIC REIONIZATION SIGNATURE

A PER-BASELINE, DELAY-SPECTRUM TECHNIQUE FOR ACCESSING THE 21 cm COSMIC REIONIZATION SIGNATURE

Enhanced Terahertz Transmission Through Bullseye Plasmonics Lenses Fabricated Using Micromilling Techniques

Ways of Switching of Static Magnetic Field and Its Influence Over the Work Parameters of Magnetic Circuits

Contact Info

Product

Resources

About