Results 21 to 30 of about 289,146 (351)
Novel antenna configurations for wireless broadband vehicular communications [PDF]
, 2010 In this paper, mobile WiMAX trials are analysed to investigate the vehicular down-link performance for a number of on-car antenna configurations. The directionality and optimum polarization of the vehicular antennas are shown to improve both the range ...
Halls, DE, Nix, AR, Zaggoulos, G
core +3 more sources
Scattering Mechanism Extraction by a Modified Cloude-Pottier Decomposition for Dual Polarization SAR
Remote Sensing, 2015 Dual polarization is a typical operational mode of polarimetric synthetic aperture radar (SAR). However, few studies have considered the scattering mechanism extraction of dual-polarization SARs.
Kefeng Ji, Yonghui Wu
doaj +1 more source
A Low-Profile Dual-Polarized Magneto-Electric Dipole Antenna for 5G Applications
Applied Sciences, 2022 A low-profile dual-polarized magneto-electric dipole (MED) is presented in this communication. The low profile was achieved using meander slots on the vertical magneto dipole, reducing the antenna height to 0.15λ0, where λ0 is the wavelength of the ...
Yulong Zhu, Qingquan Tan, Kuikui Fan
doaj +1 more source
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
Vacuum polarisation induced coupling between Maxwell and Kalb-Ramond Fields [PDF]
, 2001 We present here a manifestly gauge invariant calculation of vacuum polarization to fermions in the presence of a constant Maxwell and a constant Kalb-Ramond field in four dimensions.
A. Smailagic +17 more
core +2 more sources
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
Albedo heterogeneity on the surface of (1943) Anteros [PDF]
, 2009 We have investigated the effect of rotation on the polarization of scattered light for the near-Earth asteroid (1943) Anteros using the Dual Beam Imaging Polarimeter on the University of Hawaii's 2.2 m telescope.
Akimov +23 more
core +1 more source
Polar Duals of Convex Bodies [PDF]
Proceedings of the American Mathematical Society, 1991 The author establishes several inequalities which relate mixed volumes of a convex body \(K\) in \(\mathbb{R}^ n\) and its polar, \(K^*\). A typical example is \[ V(K^*,K,\dots,K)^ n\geq\omega^ 2_ nV(K)^{n-2}, \] where \(\omega_ n\) is the volume of the unit ball and \(V(K):=V(K,\dots,K)\) stands for the volume of \(K\).
openaire +1 more source
Assessing Single-Polarization and Dual-Polarization TerraSAR-X Data for Surface Water Monitoring
Remote Sensing, 2018 Three synthetic aperture radar (SAR) data classification methodologies were used to assess the ability of single-polarization and dual-polarization TerraSAR-X (TSX) data to classify surface water, including open water, ice, and flooded vegetation.
Katherine Irwin +4 more
doaj +1 more source
Discrete Mathematics, 2006 AbstractThe smallest number of points of an incidence structure which is self-dual but not self-polar is 7. For non-binary structures (where a “point” may occur more than once in a “block”) the number is 6.
Brouwer, A.E. +3 more
openaire +3 more sources