Search Results - "Dias, Maurício Henrique Costa"

On the Design of Conical Antennas for Broadband Impedance Matching Performance by Pereira, Francisco Estêvão Simão, Dias, Maurício Henrique Costa

“…In the scope of broadband radiators, the biconical antenna, or its monopole conical counterpart, is long known to be a proper choice. One common form of such…”
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Dual-Band Compact Planar Antenna for a Low-Cost WLAN USB Dongle by Vuong, Tan Phu, Adel, Hans, Franciscatto, Bruno Roberto, Dias, Maurício Henrique Costa

“…Among the present technologies for WLAN devices, USB dongles still play a noticeable role. One major design challenge regards the antenna, which unavoidably…”
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An analytical model for permittivity measurement of liquid dielectrics with a tubular sample holder by Rotava, André, Silva, Renato Abner Oliveira, Dias, Maurício Henrique Costa, Santos, José Carlos Araujo

“…In this work, an analytical model for permittivity measurements of liquid materials is presented. It uses a variant of the transmission line method with a…”
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An Empirical Model for Propagation Loss Through Tropical Woodland in Urban Areas at UHF by Dias, Maurício Henrique Costa, de Assis, Mauro Soares

“…A vegetation path loss model was derived from measurements performed in a downtown park in Rio de Janeiro city, from 0.9 to 1.8 GHz. The resulting equation…”
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An Evolutionary Method for Synthesizing Low-Sensitivity Lossless Matching Networks by de Sá, Leonardo Bruno, Dias, Maurício Henrique Costa, de Mesquita Filho, Antonio Carneiro

“…Whereas the present practice of designing matching networks for antennas is limited to conventional topologies, requiring a significant amount of domain…”
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A 99.95% linearity readout circuit with 72 dB dynamic range for active pixel sensors by Sá, Leonardo Bruno, Dias, Mauricio Henrique Costa, Dupret, Antoine, Mesquita Filho, Antonio Carneiro

“…Summary One of the main sources of nonlinearity and sensitivity degradation in conventional active pixel sensor (APS) architectures is the source follower…”
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Low cost electronic beam tilting of microstrip antennas by the use of tunable parasites by Dias, Mauricio Henrique Costa, Freitas, Vitor, Vuong, Tan-Phu

“…ABSTRACT In this work, parasitic elements are combined with inserted capacitances to tilt the radiated beam of a microstrip patch antenna. An application case…”
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A Case Study on the Bandwidth Broadening of a Skeletal Biconical Antenna by Estevao Simao Pereira, Francisco, Henrique Costa Dias, Mauricio

“…In the scope of Electromagnetism and its applications, antennas stand out for making the transmission and reception of radio waves feasible. The design of an…”
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Conhecimentos de interesse da doutrina sobre antenas, radiopropagação e tecnologia de rádios HF no emprego das comunicações em operações na selva na era da informação by Maurício Henrique Costa Dias, Felipe Drumond Moraes

“…As hipóteses de emprego na Amazônia têm em comum a necessidade de operar em ambiente de selva, bioma onipresente na região. Um dos principais óbices para as…”
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Path Loss Measurements of HF/VHF Land Links in a Brazilian Atlantic Rainforest Urban Site by Dias, M. H. C., Rotava, A., Andrade, F. G., Alem, R. A., Melo, M. A. K., Santos, J. C. A.

“…This letter describes a recent HF/VHF radio signal measurement campaign carried out in a small urban reservation of the Atlantic Rainforest at Rio de Janeiro,…”
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Indoor 1.8 GHz AOA-TDOA measurements extending the use of a wideband propagation channel sounder with the synthetic aperture concept by Dias, M.H.C., Siqueira, G.L.

“…This work reports the results of indoor joint AOA-TDOA measurements, using a typical wideband propagation channel sounder. The whole survey has been carried…”
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Critical analysis of ITU-R P.1812 and Egli propagation models for LoRaWAN Networks by da Silva Duarte, Bryan, Costa Dias, Mauricio Henrique

“…In the current scope of IoT, low power wide-area-networks represent a key subject. Currently, LoRa is one of the main technologies that drive the growing use…”
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Selective RF power density measurements radiated by mobile telephony RBS in Rio de Janeiro city by da Cruz, S.C., Dias, M.H.C., Siqueira, G.L.

“…This work presents a general analysis of an extensive survey comprising RF power density measurements around mobile telephony RBS, carried out in Rio de…”
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On the use of Tamir's model for site-specific path loss prediction of HF/VHF systems in forests by Melo, M. A. K., Araujo dos Santos, Jose Carlos, Dias, M. H. C.

“…One of the most referenced analytical methods to calculate the HF and VHF radio propagation loss in forests is Tamir's model. Though it is very straightforward…”
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VHF/UHF urban sites coverage planning with special care to mixed terrain transitions by Dias, M. H. C., Santos, J. C. A., Silva, G. M. O.

“…This work addresses the main features of a coverage planning algorithm for VHF/UHF low power radio communications systems operating at urban sites, in which…”
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Design and Calibration of Electric Field Probe to the Frequency Range of 2 to 3 GHz by Valdman, C., Costa Dias, M.H., Araujo dos Santos, J.C.

“…Two probes designed for electric field measurements were constructed by two semi-rigid coaxial cables, through a non-expensive simple handmade process. Both…”
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Selective RF power density measurements radiated by mobile telephony RBS in Rio de Janeiro city by da Cruz, S.C., Dias, M.H.C., Siqueira, G.L.

“…This work presents a general analysis of an extensive survey comprising RF power density measurements around mobile telephony RBS, carried out in Rio de…”
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