[PDF] Top 20 Transporte de sedimentos como carga de fondo en la cuenca del río Narcea (vertiente norte de la Cordillera Cantábrica)

... novel compact tree-design antenna (NCTA) with the ability of reconfigurable ultra-wideband (UWB) of ...This antenna has a novel radiating element design that consists of ... See full document

... communication system in terms of transmission and reception of electromagnetic ...Multiband antenna has poor isolation and leads to the occurrence of interference when multiple radios are operating ... See full document

... However, existing Wireless Local Area Network (WLAN), IEEE 802.11a systems operating in the frequency band (5.15–5.825 GHz) can cause interference with UWB systems. Therefore, a band stop filter that rejects this limited ... See full document

... slot antenna is shown in Figure 1. The antenna is printed on a 22 × 36 mm 2 F4B-2 PCB substrate, which has a relative dielectric constant of ...MIMO antenna system consists of two symmetric ... See full document

... As key components of UWB systems, wideband and high-isolation characteristics are required for UWB diversity antennas, which have been studied widely in recent years, in particular etching a ring slot on the ground plane ... See full document

... MIMO antenna, especially for the single band ...MIMO antenna, the UWB diversity antennas are usually used ...the antenna elements are perpendicular, the coupling between the antennas is ...between ... See full document

... slot antenna with wide tunability in both the bands is proposed with a single varactor ...slot antenna for tuning ...subsequent design and optimization. The proposed antenna has an edge over ... See full document

... says Antenna is one of the key systems to define the feasibility of the deployment of convergent wireless system between DVB-H and ...about antenna design up to now, and some results and ... See full document

... this antenna design, a compact and effective feeding technique is ...the antenna constructed using the Asymmetric Coplanar Strip (ACS)-fed exhibits all the advantages of the CPW-fed ... See full document

... novel compact microstrip antenna to about 9 times compared to the conventional microstrip patch antenna resulting in a resonant frequency of ...single antenna and novel DGS shape have been ... See full document

... To further characterize the behavior of the proposed antenna, the surface current distributions at 3 GHz, 2.45 GHz and 5.4 GHz are shown in Figure 5. It is clear from Figure 5 that each frequency has a quite ... See full document

... Abstract—A compact reconfigurable four-feeding microstrip antenna with polarization diversity is presented in this ...proposed antenna can achieve good impedance match for linear polarization (LP), ... See full document

... an antenna with reconfigurable band notches, for cognitive radio applications, is ...The antenna can be operated as ultra wideband, and is reconfigurable in terms of the ability to select a ... See full document

... The FCC has established certain regulations for the bands of frequencies and transmission power limits, allocated to various UWB applications. Accordingly, any system with a fractional bandwidth of at least 20% or ... See full document

... the antenna for a particular purpose, that have been focused in researches for recent ...years. Reconfigurable antenna with ability to operate in more than one frequency state offers several ... See full document

... the design of compact multiband antenna, result and discussion as well as ...to design a compact multiband antenna. Furthermore, the design process will be stated stage by ... See full document

...  To design, simulate and fabricate a compact antenna to support multiband.. frequencies.[r] ... See full document

... of reconfigurable states. Pattern reconfigurable antennas using electroactive polymer (EAP) actuators have been reported in [41, ...the design of an axial-mode pattern reconfigurable helix ... See full document

... Abstract—A compact triple-band monopole antenna covering WLAN/WiMAX bands is investigated in this ...proposed antenna has a compact size of 36 × 25 mm 2 and consists of a circular ring, a ... See full document

... The photograph of the manufactured reconfigurable antenna is shown in Figure 5. The antenna is fabricated on a 1.6 mm FR4 substrate with relative permittivity of ε r = 4.4. During measurements, the ... See full document