The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Te Kao Wu - One of the best experts on this subject based on the ideXlab platform.
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Four-Band Frequency Selective Surface with Double-Square-Loop Patch Elements
IEEE Transactions on Antennas and Propagation, 1994Co-Authors: Te Kao WuAbstract:Design and experimental verifications are presented for a four-band frequency selective surface (FSS) with perfectly conducting double-square-loop (DSL) patch elements. A single screen DSL element FSS is demonstrated for (1) a four-band FSS which reflects the X- and Ka-band signals while passing the Sand Ku-Band signals, and (2) a low-pass (or Ka-add-on) FSS that reflects the Ka-band signal while passing the S-, X-, and Ku-Band signals. Cascading the above low-pass FSS with a previously published single screen tri-band FSS, a double screen FSS is also successfully demonstrated for the Cassini four-band application. The good agreement obtained between the measured and the computed results verified both the single and double screen four-frequency FSS approaches for the Cassini Project
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Multiband Frequency Selective Surface with Multiring Patch Elements
IEEE Transactions on Antennas and Propagation, 1994Co-Authors: Te Kao Wu, Shung Wu LeeAbstract:Theoretical discussions and experimental verifications are\npresented for a multiband frequency selective surface (FSS) with\nperfectly conducting multiring patch elements. It is found that the\nnarrow-ring approximation is valid for a ring width less than\n0.025λ with λ being the wavelength of the FSS's resonant\nfrequency. A single screen double-ring element FSS is demonstrated for\n(1) a low-pass FSS that reflects the Ka-band signal while passing the\nS-, X-, and Ku-Band signals, and (2) a tri-band system that reflects the\nX-band signal while transmitting through the S- and Ku-Band signals. In\naddition, a double screen four-band FSS with non-similar double-ring\nelements is developed by cascading the above mentioned two single\nscreens. The good agreement obtained between the measured and the\ncomputed results verified the computer codes and the approaches of the\npaper
Shung Wu Lee - One of the best experts on this subject based on the ideXlab platform.
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Multiband Frequency Selective Surface with Multiring Patch Elements
IEEE Transactions on Antennas and Propagation, 1994Co-Authors: Te Kao Wu, Shung Wu LeeAbstract:Theoretical discussions and experimental verifications are\npresented for a multiband frequency selective surface (FSS) with\nperfectly conducting multiring patch elements. It is found that the\nnarrow-ring approximation is valid for a ring width less than\n0.025λ with λ being the wavelength of the FSS's resonant\nfrequency. A single screen double-ring element FSS is demonstrated for\n(1) a low-pass FSS that reflects the Ka-band signal while passing the\nS-, X-, and Ku-Band signals, and (2) a tri-band system that reflects the\nX-band signal while transmitting through the S- and Ku-Band signals. In\naddition, a double screen four-band FSS with non-similar double-ring\nelements is developed by cascading the above mentioned two single\nscreens. The good agreement obtained between the measured and the\ncomputed results verified the computer codes and the approaches of the\npaper
Luca Salghetti Drioli - One of the best experts on this subject based on the ideXlab platform.
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Circular Polarization Frequency Selective Surface Operating in Ku and Ka Band
IEEE Transactions on Antennas and Propagation, 2015Co-Authors: Robert Orr, Massimiliano Simeoni, Dmitry Zelenchuk, Elena Saenz, George Goussetis, Vincent Fusco, Luca Salghetti DrioliAbstract:A double layer circular polarization (CP) frequency selective surface (FSS) for use as a dual-band quasi-optical diplexer suitable for deployment in reflector antenna systems is described. The FSS was designed to reflect Ku band signals (11.7-12.75 GHz) while transmitting Ka band signals (17.3-20.2 GHz) and conserving CP in each of these bands. The simulated/measured reflection loss over the Ku band was less than 0.05/0.1 dB for both TE and TM polarizations, while the simulated/measured axial ratio was less than 0.2/0.75 dB. Over the Ka band, the simulated/measured transmission loss for both polarizations was below 0.25/0.4 dB and the simulated/measured axial ratio was less than 0.25/0.75 dB. To the best of our knowledge, this is the first report of a metallo-dielectric FSS that simultaneously operates in CP for an oblique angle of incidence in both Ku and Ka bands.
Yurong Cui - One of the best experts on this subject based on the ideXlab platform.
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Snow water equivalent monitoring from dual-frequency scatterometer on WCOM
2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2017Co-Authors: Jiancheng Shi, Chuan Xiong, Xiaolong Dong, Di Zhu, Gang Wang, Liling Liu, Yurong CuiAbstract:Water Cycle Observation Mission (WCOM) is a mission dedicated to synergetic observations of global water cycle parameters, with emphasis on soil moisture, ocean surface salinity, snow water equivalent and frozen/thaw. WCOM implements its observation requirements by measurement of microwave emission/scattering of both the frequencies sensitive to the key parameters and also the auxiliary frequencies providing necessary atmospheric and surface roughness corrections. In order to satisfy this measurement requirements, WCOM is equipped with payloads with combination of active and passive microwave sounding capabilities of frequency from L-band to W-band. Dual Frequency Polarized Scatterometer (DFPSCAT) is one of the three payloads onboard the satellite of Water Cycle Observation Mission (WCOM). DFPSCAT is an X/Ku band rotating pencil beam scatterometer with 2-5 km resolution and 1000km swath for mapping of snow water equivalent (SWE) and freeze-thaw process. DFPSCAT achieves fine resolution by linear frequency modulation pulse compression along the elevation direction, and by unfocused synthetic aperture processing (a technique where the Doppler effect is exploited to synthesize a longer aperture to achieve an improved resolution), as well as super-resolution reconstruction by oversampling in the direction of the azimuth. Based on the payloads of WCOM mission, especially with X/Ku scatterometer and L/Ku/Ka radiometer active/passive observations, there are obvious advantages in snow water equivalent retrieval. The atmospheric correction of active and passive data should be performed before the retrieval. The estimation of SWE mainly rely on the high resolution X and Ku band scatterometer, and combined active/passive retrieval can provide more reliable SWE product. The retrieval method of SWE from X/Ku scatterometer is described, and combined active/passive retrieval is also briefly described.
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Global mapping of snow water equivalent with the Water Cycle Observation Mission (WCOM)
2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016Co-Authors: Chuan Xiong, Lingmei Jiang, Jiancheng Shi, Yurong CuiAbstract:Global mapping methods of snow water equivalent (SWE) are developed in this study using WCOM (Water Cycle Observation Mission) active/passive multichannel observations. Based on the payloads of WCOM mission, especially with X/Ku scatterometer and L/Ku/Ka radiometer active/passive observations, there are obvious advantages in snow water equivalent retrieval. The estimation of SWE mainly rely on the high resolution X and Ku band scatterometer, and combined active/passive retrieval can provide more reliable SWE product. The retrieval method of SWE from X/Ku scatterometer is described in this study, and combined active/passive retrieval is also briefly described. These validation of SWE retrieval from X/Ku band scatterometer showed that we can get high accurate and high resolution SWE products from WCOM and then meet the science requirement of WCOM for water cycle studies.
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IGARSS - Global mapping of snow water equivalent with the Water Cycle Observation Mission (WCOM)
2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016Co-Authors: Chuan Xiong, Lingmei Jiang, Jiancheng Shi, Yurong CuiAbstract:Global mapping methods of snow water equivalent (SWE) are developed in this study using WCOM (Water Cycle Observation Mission) active/passive multichannel observations. Based on the payloads of WCOM mission, especially with X/Ku scatterometer and L/Ku/Ka radiometer active/passive observations, there are obvious advantages in snow water equivalent retrieval. The estimation of SWE mainly rely on the high resolution X and Ku band scatterometer, and combined active/passive retrieval can provide more reliable SWE product. The retrieval method of SWE from X/Ku scatterometer is described in this study, and combined active/passive retrieval is also briefly described. These validation of SWE retrieval from X/Ku band scatterometer showed that we can get high accurate and high resolution SWE products from WCOM and then meet the science requirement of WCOM for water cycle studies.
Rens Baggen - One of the best experts on this subject based on the ideXlab platform.
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Towards structural integration of airborne Ku-Band SatCom antenna
2013Co-Authors: H. Schippers, J. Verpoorte, A. Hulzinga, C. Roeloffzen, Rens BaggenAbstract:The paper describes research towards a fully structurally integrated Ku-Band SatCom antenna. This antenna covers the complete receive band for aeronautical earth stations and DVB-S broadcast in Ku band (10.7 - 12.75 GHz). The antenna front-end consists of 32 tiles where each tile has 8×8 Ku-Band stacked patch antenna elements. Optical True Time Delays (TTDs) in an Optical Beam Forming Network (OBFN) enable a squint free beam steering over the whole band to geostationary satellites. The Ku-Band antenna itself covers the whole frequency band in input impedance matching and radiation pattern. The performance of a Ku-Band antenna tile will be discussed. A design is presented for the structural integration of 32 tiles and the associated optical beam forming networks into a fuselage panel of an aircraft.
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Towards Structural Integration of Airborne Ku-Band SatCom Antenna
EUCAP 2013, 2013Co-Authors: H. Schippers, J. Verpoorte, A. Hulzinga, C. Roeloffzen, Rens BaggenAbstract:— The paper describes research towards a fully structurally integrated Ku-Band SatCom antenna. This antenna covers the complete receive band for aeronautical earth stations and DVB-S broadcast in Ku band (10.7 – 12.75 GHz). The antenna front-end consists of 32 tiles where each tile has 8x8 Ku-Band stacked patch antenna elements. Optical True Time Delays (TTDs) in an Optical Beam Forming Network (OBFN) enable a squint free beam steering over the whole band to geostationary satellites. The Ku-Band antenna itself covers the whole frequency band in input impedance matching and radiation pattern. The performance of a Ku-Band antenna tile will be discussed. A design is presented for the structural integration of 32 tiles and the associated optical beam forming networks into a fuselage panel of an aircraft. Index Terms— aircraft antennas , antenna arrays , array signal processing , satellite communication , structural integration, opto-elctronic beam forming
