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There are a total of 17 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Occulting focal plane masks for Terrestrial Planet Finder Coronagraph: design, fabrication, simulations and test results
Author(s): Balasubramanian, Kunjithapatham; Hoppe, Daniel J.; Halverson, Peter G.; Wilson, Daniel W.; Echternach, Pierre M.; Shi, Fang; Lowman, Andrew E.; Niessner, Albert F.; Trauger, John T.; Shaklan, Stuart B.
Abstract: Occulting focal plane masks for the Terrestrial Planet Finder Coronagraph (TPF-C) could be designed with continuous gray scale profile of the occulting pattern such as 1-sinc2 on a suitable material or with micron-scale ...
NASA Center: Jet Propulsion Laboratory Publication Year: 2005
Added to NTRS: 2006-12-25
Document ID: 20060043670
Polarization compensating protective coatings for TPF-Coronagraph optics to control contrast degrading cross polarization leakage
Author(s): Balasubramanian, Kunjithapatham; Hoppe, Daniel J.; Mouroulis, Pantazis Z.; Marchen, Luis F.; Shaklan, Stuart B.
Abstract: We describe here the design approaches and performance analysis of the OTA in the wavelength band of interest. Coronagraph performance at 600nm wavelength based on a particular coating and occulting focal plane mask is ...
NASA Center: Jet Propulsion Laboratory Publication Year: 2005
Added to NTRS: 2006-12-25
Document ID: 20060042853
Full-wave effects in coronagraph masks
Author(s): Hoppe, Daniel J.; Cwik, Thomas
Abstract: No Abstract Available
NASA Center: Jet Propulsion Laboratory Publication Year: 2003
Added to NTRS: 2006-12-25
Document ID: 20060043313
Coronagraph mask tolerances for exo-Earth detection
Author(s): Lay, Oliver P.; Green, Joseph J.; Hoppe, Daniel J.; Shaklan, Stuart B.
Abstract: We present the results of analysis of random errors and simulate the effects of systematic errors using specific mask designs.
NASA Center: Jet Propulsion Laboratory Publication Year: 2005
Added to NTRS: 2006-12-25
Document ID: 20060042695
Computing Scattering Matrices For Circular Waveguides
Author(s): Hoppe, Daniel J.
Abstract: Scattering Matrix Program for Circular Waveguide Junctions computes scattering matrix for series of circular waveguide sections. Sections must have same axis, but radius and length of each section completely arbitrary. ...
NASA Center: Jet Propulsion Laboratory Publication Year: 1990
Added to NTRS: 2005-09-30
Accession Number: 90B10464; Document ID: 19900000464; Report Number: NPO-17245
Computing Radiation From Axisymmetric Waveguide Feed Horns
Author(s): Chinn, Gilbert C.; Epp, Larry W.; Hoppe, Daniel J.
Abstract: Hybrid finite-element method developed for computing radiation patterns and reflection coefficients of axisymmetric waveguide feed horns that include dielectric bodies like rods and radomes. Dielectric inhomogeneities ...
NASA Center: Jet Propulsion Laboratory Publication Year: 1996
Added to NTRS: 2005-09-30
Accession Number: 96B10262; Document ID: 19960024406; Report Number: NPO-19558
Broadband Venetian-Blind Polarizer With Dual Vanes
Author(s): Conroy, Bruce L.; Hoppe, Daniel J.
Abstract: Improved venetian-blind polarizer features optimized tandem, two-layer vane configuration reducing undesired reflections and deformation of radiation pattern below those of prior single-layer vane configuration. Consists of ...
NASA Center: Jet Propulsion Laboratory Publication Year: 1995
Added to NTRS: 2005-09-30
Accession Number: 95B10011; Document ID: 19950065170; Report Number: NPO-19084
Megawatt Square Microwave Feed Horn
Author(s): Hoppe, Daniel J.
Abstract: Prototype multiflare square horn antenna designed to combine phased 8.51-GHz outputs of four 250-kW amplifiers into single 1-MW continuous-wave beam. Main lobe and side lobes reasonably below main lobe obtained by choosing ...
NASA Center: Jet Propulsion Laboratory Publication Year: 1991
Added to NTRS: 2005-09-30
Accession Number: 91B10236; Document ID: 19910000236; Report Number: NPO-18025
Computing Scattering Characteristics Of Waveguide Junctions
Author(s): Hoppe, Daniel J.; Manshadi, Farzin
Abstract: Rectangular WaveGuide Junction SCATtering RWGSCAT computer program solves scattering properties of waveguide device. Modeled as assembly of rectangular waveguides of different cross sections. RWGSCAT written in FORTRAN 77.
NASA Center: Jet Propulsion Laboratory Publication Year: 1994
Added to NTRS: 2005-09-30
Accession Number: 94B10488; Document ID: 19940000488; Report Number: NPO-19091
Designing A Mode Converter For Use With A Gyrotron
Author(s): Hoppe, Daniel J.
Abstract: Report describes process of designing corrugated, circular-cross-section length of waveguide converting input electromagnetic radiation at frequency of 34.5 GHz in TM(11) mode to output radiation in HE(11) mode. TM(11)-mode ...
NASA Center: Jet Propulsion Laboratory Publication Year: 1995
Added to NTRS: 2005-09-30
Accession Number: 95B10358; Document ID: 19950065517; Report Number: NPO-19352
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