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Курочкин, Юрий Владимирович |
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Title |
Методы повышения пропускной способности квантовой криптографии |
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2011 |
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Abbreviated Journal |
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quantum cryptography |
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Ph.D. thesis |
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no |
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762 |
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Author |
Saynak, UÄŸur |
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Title |
Novel rectangular spiral antennas |
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Manuscript |
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2008 |
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Abbreviated Journal |
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optical antennas |
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Round spiral antennas are generally designed by using Archimedean spiral geometries which have linear growth rates. To obtain smaller antennas with nearly the same performance, square spiral Archimedean geometries are also widely used instead. In this study, novel square antennas are proposed, designed and examined. At first two similar but different approaches are employed to design new antennas by considering the design procedure used to obtain log-periodic antennas. Then, the performance of these antennas is improved by considering another property of log-periodic antennas. Simulations are performed by using two different numerical methods which are Finite Difference Time Domain Method (FDTD) and Method of Moments (MoM). The results obtained from the simulations are compared with those of the Archimedean spiral antennas in terms of the frequency dependency of fundamental antenna parameters such as antenna gain and radiation pattern. The simulation results are compared with the ones obtained from the experimental study. |
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no |
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RPLAB @ gujma @ |
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750 |
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Author |
Kramer, B.; Chen, C-C.; Volakis, J.D. |
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Title |
The development of a mini-UWB antenna |
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Journal Article |
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2004 |
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Measurement and Techniques Association Symposium |
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AMTA |
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6 |
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Keywords |
optical antennas; Ultra Wide Band; Spiral Antenna, Dielectric Loading |
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There is a great interest in the automotive and military sectors for small and broadband antennas that meet modern communication needs. These needs require ultra-wide bandwidth (>10:1) UWB antennas, such as the spiral antenna. However, the physical size at the low-frequency end typically becomes too large for practical applications. To reduce the size of the antenna, miniaturization techniques must be employed such as the use of high-contrast dielectric materials. Size reduction using high-contrast materials has been demonstrated for narrowband antennas, such as patch antennas, but not for broadband antennas to our knowledge. Therefore, the concept of miniaturizing a broadband spiral antenna using dielectric materials will be investigated experimentally and numerically.Issues that arise from dielectric loading such as impedance reduction will also be addressed. It will be shown using the results from these studies that there are practical limitations to the amount of miniaturization which can be achieved. |
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RPLAB @ gujma @ |
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751 |
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Author |
Esteban, Eduin; Serna, Hernandez |
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Title |
Quantum key distribution protocol with private-public key |
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Journal Article |
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2009 |
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arXiv |
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arXiv |
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3 |
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Keywords |
quantum cryptography; QKD; protocol |
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A quantum cryptographic protocol based in public key cryptography combinations and private key cryptography is presented. Unlike the BB84 protocol 1 and its many variants 2,3 two quantum channels are used. The present research does not make reconciliation mechanisms of information to derive the key. A three related system of key distribution are described. |
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arXiv: 0908.2146 |
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RPLAB @ gujma @ |
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756 |
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Author |
Doerr, C.R.; Zhang, C.; Winzer, P.J. |
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Title |
Monolithic InP multi-wavelength coherent receiver |
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Conference Article |
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2010 |
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Conference on optical fiber communication, collocated national fiber optic engineers conference |
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Conf. OFC/NFOEC |
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1-3 |
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InP balanced detector, waveguide grating, polarization splitter, from chiralphotonics |
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We propose and demonstrate a novel four-channel monolithic polarization-diversity dual-quadrature coherent receiver with balanced detection in InP. It uses an interleave-chirped arrayed waveguide grating that acts simultaneously as a demultiplexer, 90° hybrid, and polarization splitter. |
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851 |
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