F1.1 Terrestrial Fixed Radio Systems Active studies of rain attenuation characteristics are continuing for developing broadb quasi-millimeter wave band. It is based on a trend that the use of microwave band gradually from the fixed use to the mobile use. Results of those stu and systems above has been changing dies will be reflected in developing a multipoint-to-multipoint system, a mesh type w...

A fixed wireless access (FWA) system enables to provide a broadband wireless access service with a user bit-rate of more than 10Mbps. Propagation studies have been carried out to clarify the multipath characteristics in several environments and frequency bands for developing that system. A 5-GHz band is expected to be available for wireless access systems and a residential area is an important ...

Let f : X −→ N be an integer function. An f -factor is a spanning subgraph of a graph G = (X,E) whose vertices have degrees defined by f . In this paper, we prove a sufficient condition for the existence of a f -factor which involves the stability number, the minimun degree of G or the connectivity of the graph.

The millimeter-wave and THz frequency (f > 100 GHz) range remains one of the most underdeveloped frequency ranges, even though there are a great number of potential applications in remote sensing, spectroscopy, plasma diagnostics, and communications. This is because the millimeter wave and far-infrared frequency range falls between two other frequency ranges, the microwave frequency range and t...

A microstrip patch antenna is designed that have metallic ring coplanar to radiation patch for gain enhancement is proposed. The design forces conversion of the surface wave energy into the space wave energy by the scattering of surface waves from metallic ring. The metallic ring is placed around the metal patch at a distance of d1 from the edges of the metal patch and width of metallic ring is...

The high-order harmonic-wave generation of ultrasonic shear waves has not yet been studied. We generated high-order shear harmonic waves and studied them in terms of the nonlinear wave mechanism associated with strain waves. When the shear waves propagated through highly dissipative MnCu20Ni5Fe2, TiNi, and Sn-3Al specimens and were reflected from the far side of the specimen, we observed high-o...

recordings of ambient noise or microtremors are increasingly used to find valuable information on soil in one dimension at a given site. ambient vibrations, which are assumed to be mainly composed of surface waves, can be used to determine the surface wave dispersion curve in order to retrieve shear wave velocity profile. in this regard, microtremors are usually recorded simultaneously in an ar...