Results 221 to 230 of about 75,278 (248)

Dual polar spaces

2016
In this chapter, we study dual polar spaces. These are certain point-line geometries that are closely related to polar spaces. We study several properties of these geometries and describe several families. Dual polar spaces are examples of near polygons.
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A DUAL POLARIZED ANTENNA

2009
This invention relates to an antenna (1 ) of the type comprising a casing (3) having a reflector (5) defining a slot (7) and a PCB board (9) carrying a plurality of radiating elements (10) and a feed harness (11 ). The radiating elements and the feed harness form a dual polarized antenna pattern. The PCB is mounted in the casing and protrudes outwardly
BROWNE JAMES, BROWNE EDWINA, THOMPSON NAOMI, COLLERY JUSTIN   +3 more
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FPIR: The dual polarization antenna

2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS, 2013
Full Polarization Interferometric Radiometer (FPIR) is concept of one dimensional synthetic radiometer. This paper introduces the design of the FPIR antenna. A novel linear array antenna is described with emphasis on the simulation of the antenna pattern, design of the stripline feeding network and simulation of the polarimetric isolation.
Jingye Yan, Ji Wu, Xiaocheng Yang, Hao Liu, Cheng Zhang, Guang Liu, Heguang Liu   +6 more
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Broadband dual-polarized omnidirectional antennas

Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation, 2012
A broadband dual-circularly polarized (right-handed and left-handed) omnidirectional antenna and a broadband dual-linearly (horizontally and vertically) polarized omnidirectional antenna are presented. Both dual-polarized omnidirectional antennas have a bandwidth of about 30%. Good omnidirectional radiation patterns are obtained for both polarizations.
XuLin Quan, RongLin Li
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Broadband Dual-Polarized Printed Arrays

19th European Microwave Conference, 1989, 1989
Two double-sided printed-dipole arrays are combined in the same aperture. The arrays operate efficiently in two orthogonal polarizations over a large band of frequencies. Experimental results verify the practical value of this antenna.
E. Levine, S. Shtrikman
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Dual-polarized plasmonic nano-cables

2009 11th International Conference on Transparent Optical Networks, 2009
In this paper we discuss eigenmodes propagating in plasmonic coaxial waveguides of nano-scale dimensions. Plasmonic nano-cables with an elliptic shape of a central rod are proposed. Break of the azimuthal symmetry makes it easier to excite dipole-type modes.
Andrey Soloviev, Igor Nefedov, Sergei Tretyakov   +2 more
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Dual Polarity Gravity Paper

We propose a unified conceptual and mathematical framework in which gravity exists in two conserved and interacting modes: Attractive Gravity (AG), which is locally bound to mass, and Repellent Gravity (RG), which exists as a free, dispersed substrate permeating the cosmos.
Liles, Steven, GO-AI human AI collaboration   +1 more
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Dual polarized smart antenna beams

Proceedings of Vehicular Technology Conference - VTC, 2002
Interest has centered on the use of "smart antennas" in cellular as well as DCS 1800/PCS 1900 bands with a view to obtaining significantly improved spectral efficiencies, better quality of service, higher capacities, and improved coverage, while at the same time achieving significant savings in base station costs.
B. Vaidyanathan, M.D. Srinath, G.D. Mandyam   +2 more
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Wideband Dual-Polarized Patch Antenna

2006 10th IEEE Singapore International Conference on Communication Systems, 2006
Dual-polarized L-probe patch antennas afford wide impedance bandwidth and increased channel capacity. However, due to the close proximity, the coupling between the two input ports remains an important problem. In this paper, we introduce the use of a novel 180deg broadband microstrip balun which delivers both balanced power splitting and consistent ...
Kah-wee Khoo, Yong-xin Guo, Ling-chuen Ong   +2 more
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Dual-polarized flat array antenna

IEEE Antennas and Propagation Society International Symposium. 1995 Digest, 2002
In Europe, satellite broadcasting services such as ASTRA are getting more popular. The services currently use 4-types of communication satellites with 516 channels. It is necessary for large number of channels reception that the antenna has a wide frequency band-width (10.7 GHz to 11.7 GHz) on both vertical and horizontal polarization with high ...
K. Tsukamoto, T. Saitou, H. Arai
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