Results 21 to 30 of about 94,464 (307)
Sensors, 2021 A compact ultra-wideband dual-polarized Vivaldi antenna is proposed for full polarimetric ground-penetrating radar (GPR) applications. A shared-aperture configuration comprising four Vivaldi elements for orthogonal polarizations is designed to reduce the
Hai-Han Sun +5 more
doaj +1 more source
A Multioctave 8 GHz
IEEE Journal of Microwaves, 2023 Accurate measurement of angular positions on the sky requires a well-defined system of reference, something that in practice is realized by the International Celestial Reference Frame (ICRF) with observations of distant (typical redshift $\sim$1) Active ...
Jacob W. Kooi +17 more
doaj +1 more source
Dual Circularly Polarized Reflectarray With Independent Control of Polarizations [PDF]
IEEE Transactions on Antennas and Propagation, 2015 A reflectarray with independent dual-circular polarizations is proposed for the first time. The reflector panel operates in X-band and contains 97 unit-cells. It is made with a lego-type configuration allowing change manually the phase aperture distribution and demonstrating experimentally the independence of both polarizations in the same frequency ...
Mener, Simon +4 more
openaire +2 more sources
Dual-polarization Mode Microwave Channelizer with a Kerr Soliton Crystal Microcomb
, 2023 We report a dual-polarization radio frequency (RF) channelizer based on microcombs. With the tailored mismatch between the FSRs of the active and passive MRRs, wideband RF spectra can be channelized into multiple segments featuring digital-compatible ...
David Moss (8139768)
core +1 more source
Fully Planar Dual-Polarized Broadband Antenna for 3G, 4G and Sub 6-GHz 5G Base Stations
IEEE Access, 2020 A fully planar dual polarized radiating element with internal embedded coupled dipoles is presented in this paper. The inclusion of these elements allows achieving three different goals: firstly, an extension of the bandwidth towards lower frequencies ...
Sergio Martin-Anton +1 more
doaj +1 more source
Dual-polarization Microwave Channelizer based on a Kerr Soliton Crystal Microcomb
, 2023 We report a dual-polarization radio frequency (RF) channelizer based on microcombs. With the tailored mismatch between the FSRs of the active and passive MRRs, wideband RF spectra can be channelized into multiple segments featuring digital-compatible ...
Xingyuan Xu (12620454) +2 more
core +1 more source
IEEE Access, 2017 A fast dual polarization hopping (FDPH) system is designed to enhance the physical layer secure transmission in fixed down-link satellite communications. In order to prevent the eavesdropper from detecting transmitted signals, a pair of dual polarization
Xiaokai Zhang +2 more
doaj +1 more source
Polarization‐Controlled Dual‐Programmable Metasurfaces
Advanced Science, 2020 Programmable metasurfaces allow dynamic and real‐time control of electromagnetic (EM) waves in subwavelength resolution, holding extraordinary potentials to establish meta‐systems. Achieving independent and real‐time controls of orthogonally‐polarized EM
Xin Ge Zhang +7 more
doaj +1 more source
Underlying Topography Inversion Using Dual Polarimetric TomoSAR
Sensors, 2021 Underlying topography plays an important role in the national economic construction, military security, resource exploration and investigation. Since synthetic aperture radar tomography (TomoSAR) can achieve the three-dimensional imaging of forests, it ...
Xing Peng +5 more
doaj +1 more source
Polarized and homogeneous embeddings of dual polar spaces [PDF]
Journal of Algebraic Combinatorics, 2009 An embedding \(e: \Gamma \rightarrow PG(V)\) of a dual polar space \(\Gamma\) is \textit{polarized} if, for every point \(x\in \Gamma\), the image \(e(H)_x\) of the hyperplane \(H_x\) of \(\Gamma\), formed by the points at non-maximal distance from \(x\), spans a hyperplane of \(PG(V)\).
BLOK R. +3 more
openaire +3 more sources