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2. Submillimeter wave frequency selective surface with polarization independent spectral responses

Author

Dickie, Raymond, Cahill, Robert, Gamble, Harold, Fusco, Vincent, Henry, Manju, Oldfield, Matthew, Huggard, Peter, Howard, Philip, Grant, Norman, Munro, Yvonne, and de Maagt, Peter

Subjects
Millimeter waves -- Properties, Electric filters -- Design and construction, Electromagnetic waves -- Polarization, Electromagnetic waves -- Methods, Business, Computers, Electronics, Electronics and electrical industries
Abstract

This paper reports the design, construction and electromagnetic performance of a new freestanding frequency selective surface (FSS) structure which generates coincident spectral responses for dual polarization excitation at oblique angles of incidence. The FSS is required to allow transmission of 316.5-325.5 GHz radiation with a loss [less than or equal to] 0.6 dB and to achieve [greater than or equal to] 30 dB rejection from 349.5-358.5 GHz. It should also exhibit crosspolarization levels below -25 dB, all criteria being satisfied simultaneously for TE and TM polarizations at 45[degrees] incidence. The filter consists of two identical, 30 mm diameter, 12.5 [micro]m thick, optically flat, perforated metal screens separated by 450 [micro]m. Each of the [approximately equal to] 5000 unit cells contains two nested, short circuited, rectangular loop slots and a rectangular dipole slot. The nested elements provide a passband spectral response centered at 320 GHz in the TE and TM planes; the dipole slot increases the filter roll-off above resonance. The FSS was fabricated from silicon-on-insulator wafers using precision micromachining and plating processes including the use of deep reactive ion etching (DRIE) to pattern the individual slots and remove the substrate under the periodic arrays. Quasi-optical transmission measurements in the 250-360 GHz range yielded virtually identical copolarized spectral responses, with the performance meeting or exceeding the above specifications. Experimental resuits are in excellent agreement with numerical predictions. Index Terms--Dichroic filters, freestanding mesh, frequency selective surfaces (FSSs), millimeter and submillimeter waves, quasioptical filters.

Published
2009

3. SEASTAR: A Mission to Study Ocean Submesoscale Dynamics and Small-Scale Atmosphere-Ocean Processes in Coastal, Shelf and Polar Seas

Author

Gommenginger, Christine, Chapron, Bertrand, Hogg, Andy, Buckingham, Christian, Fox-kemper, Baylor, Eriksson, Leif, Soulat, Francois, Ubelmann, Clément, Ocampo-torres, Francisco, Nardelli, Bruno Buongiorno, Griffin, David, Lopez-dekker, Paco, Knudsen, Per, Andersen, Ole, Stenseng, Lars, Stapleton, Neil, Perrie, William, Violante-carvalho, Nelson, Schulz-stellenfleth, Johannes, Woolf, David, Isern-fontanet, Jordi, Ardhuin, Fabrice, Klein, Patrice, Mouche, Alexis, Pascual, Ananda, Capet, Xavier, Hauser, Daniele, Stoffelen, Ad, Morrow, Rosemary, Aouf, Lotfi, Breivik, Øyvind, Fu, Lee-lueng, Johannessen, Johnny A., Aksenov, Yevgeny, Bricheno, Lucy, Hirschi, Joel, Martin, Adrien Ch, Martin, Adiran P, Nurser, George, Polton, Jeff, Wolf, Judith, Johnsen, Harald, Soloviev, Alexander, Jacobs, Gregg A., Collard, Fabrice, Groom, Steve, Kudryavtsev, Vladimir, Wilkin, John, Navarro, Victor, Babanin, Alex, Martin, Matthew, Siddorn, John, Saulter, Andrew, Rippeth, Tom, Emery, Bill, Maximenko, Nikolai, Romeiser, Roland, Graber, Hans, Azcarate, Aida Alvera, Hughes, Chris W., Vandemark, Doug, Silva, Jose Da, Leeuwen, Peter Jan Van, Naveira-garabato, Alberto, Gemmrich, Johannes, Mahadevan, Amala, Marquez, Jose, Munro, Yvonne, Doody, Sam, Burbidge, Geoff, Gommenginger, Christine, Chapron, Bertrand, Hogg, Andy, Buckingham, Christian, Fox-kemper, Baylor, Eriksson, Leif, Soulat, Francois, Ubelmann, Clément, Ocampo-torres, Francisco, Nardelli, Bruno Buongiorno, Griffin, David, Lopez-dekker, Paco, Knudsen, Per, Andersen, Ole, Stenseng, Lars, Stapleton, Neil, Perrie, William, Violante-carvalho, Nelson, Schulz-stellenfleth, Johannes, Woolf, David, Isern-fontanet, Jordi, Ardhuin, Fabrice, Klein, Patrice, Mouche, Alexis, Pascual, Ananda, Capet, Xavier, Hauser, Daniele, Stoffelen, Ad, Morrow, Rosemary, Aouf, Lotfi, Breivik, Øyvind, Fu, Lee-lueng, Johannessen, Johnny A., Aksenov, Yevgeny, Bricheno, Lucy, Hirschi, Joel, Martin, Adrien Ch, Martin, Adiran P, Nurser, George, Polton, Jeff, Wolf, Judith, Johnsen, Harald, Soloviev, Alexander, Jacobs, Gregg A., Collard, Fabrice, Groom, Steve, Kudryavtsev, Vladimir, Wilkin, John, Navarro, Victor, Babanin, Alex, Martin, Matthew, Siddorn, John, Saulter, Andrew, Rippeth, Tom, Emery, Bill, Maximenko, Nikolai, Romeiser, Roland, Graber, Hans, Azcarate, Aida Alvera, Hughes, Chris W., Vandemark, Doug, Silva, Jose Da, Leeuwen, Peter Jan Van, Naveira-garabato, Alberto, Gemmrich, Johannes, Mahadevan, Amala, Marquez, Jose, Munro, Yvonne, Doody, Sam, and Burbidge, Geoff

Abstract

High-resolution satellite images of ocean color and sea surface temperature reveal an abundance of ocean fronts, vortices and filaments at scales below 10 km but measurements of ocean surface dynamics at these scales are rare. There is increasing recognition of the role played by small scale ocean processes in ocean-atmosphere coupling, upper-ocean mixing and ocean vertical transports, with advanced numerical models and in situ observations highlighting fundamental changes in dynamics when scales reach 1 km. Numerous scientific publications highlight the global impact of small oceanic scales on marine ecosystems, operational forecasts and long-term climate projections through strong ageostrophic circulations, large vertical ocean velocities and mixed layer re-stratification. Small-scale processes particularly dominate in coastal, shelf and polar seas where they mediate important exchanges between land, ocean, atmosphere and the cryosphere, e.g., freshwater, pollutants. As numerical models continue to evolve toward finer spatial resolution and increasingly complex coupled atmosphere-wave-ice-ocean systems, modern observing capability lags behind, unable to deliver the high-resolution synoptic measurements of total currents, wind vectors and waves needed to advance understanding, develop better parameterizations and improve model validations, forecasts and projections. SEASTAR is a satellite mission concept that proposes to directly address this critical observational gap with synoptic two-dimensional imaging of total ocean surface current vectors and wind vectors at 1 km resolution and coincident directional wave spectra. Based on major recent advances in squinted along-track Synthetic Aperture Radar interferometry, SEASTAR is an innovative, mature concept with unique demonstrated capabilities, seeking to proceed toward spaceborne implementation within Europe and beyond.

Published
2019
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4. SEASTAR: A Mission to Study Ocean Submesoscale Dynamics and Small-Scale Atmosphere-Ocean Processes in Coastal, Shelf and Polar Seas

Author

Centre for Earth Observation Instrumentation (UK), European Commission, Gommenginger, Christine, Chapron, Bertrand, Hogg, Andy, Buckingham, Christian E., Fox-Kemper, Baylor, Eriksson, Leif, Soulat, François, Ubelmann, Clément, Ocampo-Torres, Francisco, Buongiorno Nardelli, Bruno, Griffin, David, Lopez-Dekker, Paco, Knudsen, Per, Andersen, Ole, Stenseng, Lars, Stapleton, Neil, Perrie, W., Violante-Carvalho, Nelson, Schulz-Stellenfleth, Johannes, Woolf, David K., Isern-Fontanet, Jordi, Ardhuin, Fabrice, Klein, Patrice M., Mouche, Alexis Aurélien, Pascual, Ananda, Capet, Xavier, Hauser, Daniele, Stoffelen, Ad, Morrow, Rosemary Anne, Aouf, Lotfi, Breivik, Øyvind, Fu, Lee-Lueng, Johannessen, Johnny A., Aksenov, Yevgeny, Bricheno, Lucy, Hirschi, Joel, Martin, Adrien C.H., Martin, Adrian P., Nurser, George, Polton, Jeff, Wolf, J., Johnsen, Harald, Soloviev, Alexander, Jacobs, Gregg A., Collard, Fabrice, Groom, S., Kudryavtsev, Vladimir, Wilkin, John, Navarro, Víctor, Babanin, Alex, Martin, Matthew James, Siddorn, John, Saulter, Andrew, Rippeth, Tom, Emery, Bill, Maximenko, Nikolai, Romeiser, Roland, Graber, Hans, Alvera-Azcárate, Aida, Hughes, Chris William, Vandemark, Doug, da Silva, Jose, Van Leeuwen, Peter Jan, Naveira-Garabato, Alberto, Gemmrich, Johannes, Mahadevan, Amala, Marquez, Jose, Munro, Yvonne, Doody, Sam, Burbidge, Geoff, Centre for Earth Observation Instrumentation (UK), European Commission, Gommenginger, Christine, Chapron, Bertrand, Hogg, Andy, Buckingham, Christian E., Fox-Kemper, Baylor, Eriksson, Leif, Soulat, François, Ubelmann, Clément, Ocampo-Torres, Francisco, Buongiorno Nardelli, Bruno, Griffin, David, Lopez-Dekker, Paco, Knudsen, Per, Andersen, Ole, Stenseng, Lars, Stapleton, Neil, Perrie, W., Violante-Carvalho, Nelson, Schulz-Stellenfleth, Johannes, Woolf, David K., Isern-Fontanet, Jordi, Ardhuin, Fabrice, Klein, Patrice M., Mouche, Alexis Aurélien, Pascual, Ananda, Capet, Xavier, Hauser, Daniele, Stoffelen, Ad, Morrow, Rosemary Anne, Aouf, Lotfi, Breivik, Øyvind, Fu, Lee-Lueng, Johannessen, Johnny A., Aksenov, Yevgeny, Bricheno, Lucy, Hirschi, Joel, Martin, Adrien C.H., Martin, Adrian P., Nurser, George, Polton, Jeff, Wolf, J., Johnsen, Harald, Soloviev, Alexander, Jacobs, Gregg A., Collard, Fabrice, Groom, S., Kudryavtsev, Vladimir, Wilkin, John, Navarro, Víctor, Babanin, Alex, Martin, Matthew James, Siddorn, John, Saulter, Andrew, Rippeth, Tom, Emery, Bill, Maximenko, Nikolai, Romeiser, Roland, Graber, Hans, Alvera-Azcárate, Aida, Hughes, Chris William, Vandemark, Doug, da Silva, Jose, Van Leeuwen, Peter Jan, Naveira-Garabato, Alberto, Gemmrich, Johannes, Mahadevan, Amala, Marquez, Jose, Munro, Yvonne, Doody, Sam, and Burbidge, Geoff

Abstract

High-resolution satellite images of ocean color and sea surface temperature reveal an abundance of ocean fronts, vortices and filaments at scales below 10 km but measurements of ocean surface dynamics at these scales are rare. There is increasing recognition of the role played by small scale ocean processes in ocean-atmosphere coupling, upper-ocean mixing and ocean vertical transports, with advanced numerical models and in situ observations highlighting fundamental changes in dynamics when scales reach 1 km. Numerous scientific publications highlight the global impact of small oceanic scales on marine ecosystems, operational forecasts and long-term climate projections through strong ageostrophic circulations, large vertical ocean velocities and mixed layer re-stratification. Small-scale processes particularly dominate in coastal, shelf and polar seas where they mediate important exchanges between land, ocean, atmosphere and the cryosphere, e.g., freshwater, pollutants. As numerical models continue to evolve toward finer spatial resolution and increasingly complex coupled atmosphere-wave-ice-ocean systems, modern observing capability lags behind, unable to deliver the high-resolution synoptic measurements of total currents, wind vectors and waves needed to advance understanding, develop better parameterizations and improve model validations, forecasts and projections. SEASTAR is a satellite mission concept that proposes to directly address this critical observational gap with synoptic two-dimensional imaging of total ocean surface current vectors and wind vectors at 1 km resolution and coincident directional wave spectra. Based on major recent advances in squinted along-track Synthetic Aperture Radar interferometry, SEASTAR is an innovative, mature concept with unique demonstrated capabilities, seeking to proceed toward spaceborne implementation within Europe and beyond

Published
2019

5. SEASTAR: A Mission to Study Ocean Submesoscale Dynamics and Small-Scale Atmosphere-Ocean Processes in Coastal, Shelf and Polar Seas

Author

Gommenginger, Christine, primary, Chapron, Bertrand, additional, Hogg, Andy, additional, Buckingham, Christian, additional, Fox-Kemper, Baylor, additional, Eriksson, Leif, additional, Soulat, Francois, additional, Ubelmann, Clément, additional, Ocampo-Torres, Francisco, additional, Nardelli, Bruno Buongiorno, additional, Griffin, David, additional, Lopez-Dekker, Paco, additional, Knudsen, Per, additional, Andersen, Ole, additional, Stenseng, Lars, additional, Stapleton, Neil, additional, Perrie, William, additional, Violante-Carvalho, Nelson, additional, Schulz-Stellenfleth, Johannes, additional, Woolf, David, additional, Isern-Fontanet, Jordi, additional, Ardhuin, Fabrice, additional, Klein, Patrice, additional, Mouche, Alexis, additional, Pascual, Ananda, additional, Capet, Xavier, additional, Hauser, Daniele, additional, Stoffelen, Ad, additional, Morrow, Rosemary, additional, Aouf, Lotfi, additional, Breivik, Øyvind, additional, Fu, Lee-Lueng, additional, Johannessen, Johnny A., additional, Aksenov, Yevgeny, additional, Bricheno, Lucy, additional, Hirschi, Joel, additional, Martin, Adrien C. H., additional, Martin, Adrian P., additional, Nurser, George, additional, Polton, Jeff, additional, Wolf, Judith, additional, Johnsen, Harald, additional, Soloviev, Alexander, additional, Jacobs, Gregg A., additional, Collard, Fabrice, additional, Groom, Steve, additional, Kudryavtsev, Vladimir, additional, Wilkin, John, additional, Navarro, Victor, additional, Babanin, Alex, additional, Martin, Matthew, additional, Siddorn, John, additional, Saulter, Andrew, additional, Rippeth, Tom, additional, Emery, Bill, additional, Maximenko, Nikolai, additional, Romeiser, Roland, additional, Graber, Hans, additional, Azcarate, Aida Alvera, additional, Hughes, Chris W., additional, Vandemark, Doug, additional, Silva, Jose da, additional, Leeuwen, Peter Jan Van, additional, Naveira-Garabato, Alberto, additional, Gemmrich, Johannes, additional, Mahadevan, Amala, additional, Marquez, Jose, additional, Munro, Yvonne, additional, Doody, Sam, additional, and Burbidge, Geoff, additional

Published
2019
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7. Rotman Lens-Based Retrodirective Array

Author

Christie, Steven, primary, Cahill, Robert, additional, Buchanan, Neil B., additional, Fusco, Vincent F., additional, Mitchell, Neil, additional, Munro, Yvonne V., additional, and Maxwell-Cox, Graham, additional

Published
2012
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