+ Visit NASA.gov + Contact NASA   + Home Select Search Field * All Report - Patent Number Abstract *Accession Number *NASA Center *Author NameDocument IDKeywordsPublication Date *Title * Find Results With All of the words At least one of the words Enter Search Term  within returned results    Search Tips: Use only the fields with * to search NIX collection. Enclose terms in double quotation marks (") to search for exact phrases, ie: "space shuttle". NOTE: Commas and dashes are removed from search term by search engine. Select Reset Search button to start a new search. See Help for more tips. + Publication Year + Subject + Availability Options – Item/Media Type  + Journal Article  + NACA Report  + NASA Report  + Technical Report  + Conference Paper  + NASA Tech Brief Selected Navigations: Author > Hoppe, Daniel J. [x] Sort results by: NASA Center | Date Added to NTRS | Publication Year There are a total of 17 record(s) matching your query. Sorted by: Date Added To NTRS in Descending order 1 2 Next  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 1 2 Next  + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007