Surface Wave

Jacques El Khoury, Régis Guinvarc'h Supelec, SONDRA 3 Joliot-Curie, 91190 Gif-sur-Yvette, France jacques.elkhoury@supelec.fr ... Raphaël Gillard, Bernard Uguen INSA – IETR, Rennes, France Université Rennes 1 – IETR, Rennes, France ... Abstract—A simulator of a High Frequency Surface Wave Radar is presented. The receiving antennas of this radar can be placed onshore or deployed offshore. Effects of offshore antenna movements on the sea clutter can be studied using this simulator. ... Keywords- Bragg waves; Sea patch; ...

... Domenico Gardini1, Maria di Donato2 & Enzo Boschi2 1 Dipartimento di Scienze Geologiche Universit`a di Roma Tre, I-00146, Italy (now at Institut für Geophysik, ETH, Zürich, CH-8093, Switzerland) 2 ... tion: MW = 2/3 log(M0)-9.09 (with M0 expressed in dyne cm; Kanamori, 1977 ...

This paper investigates the ambiguities that exist in the bearing estimate of human footstep signals acquired using a single tri-axial geophone. Estimated angles for a series of footsteps from three different walking patterns are evaluated. It is observed that there are two kinds of ambiguities, viz., energy and wave polarization. A systematic study of these ambiguities are presented using covariance

This paper investigates the enhancement of the sensitivity and adsorption efficiency of a localized surface plasmon resonance (LSPR) biosensor that includes a layer of graphene sheet on top of the gold layer. For this purpose, biomolecular interactions of biotin-streptavidin with the graphene layer on the gold thin film are monitored. The performance of the LSPR graphene biosensor is theoretically and numerically assessed in terms of sensitivity and adsorption efficiency under varying conditions, including the thickness of biomolecule layer, number of graphene layers and operating wavelength. Enhanced sensitivity and improved adsorption efficiency are obtained for the LSPR graphene biosensor in comparison with its conventional counterpart. It is found that the LSPR graphene biosensor has better sensitivity with lower operating wavelength and larger number of graphene layers.

The coplanar waveguide (CPW) structure is subdivided into five classes based on substrate thickness, backside metallization, and ground plane width. Radiation and guided modes are studied in each class, and their effects on loss and dispersion are described. For coplanar waveguides, dispersion due to interaction with surface wave parallel-plate modes in the substrate strongly depends on the ground-to-ground spacing (W+2G). If this spacing is small compared to dielectric wavelength and substrate thickness, both dispersion and radiation losses are minimized. In finite ground plane cases, small ground-to-ground spacing compared to substrate thickness is necessary to avoid the excitation of the microstrip mode and to minimize the deviation of the CPW mode from the odd mode of the ideal line. Limitations on the reduction of (W+2G) come from conductor loss, which imposes a minimum width requirement on the center conductor. If substrate thickness is to be kept large compared with this dimension, it is inevitable that, at high frequencies, the operation of the CPW will not be below the cutoff frequency of surface wave modes. However, the interaction of the CPW mode with surface wave modes is negligible for integrated circuit applications when ground-to-ground spacing is small compared with dielectric wavelength