The increasing interest in wireless body area networks has created the need for alternative communication schemes. One example of such schemes is use human as a medium. This technology called (HBC), and it offers advantages over most common radiation-based methods, which makes an interesting to implement networks. aim this paper identify influence fixture on HBC channel characterization, extended model that includes test fixtures explain measured response proposed. was tested against...

In this article, Fiber Bragg Grating (FBG) technology used to implement fiber sensors is explained and some applications in temperature strain measurements are presented. the first section, fundamentals operation principles of FBGs shown as well optical sensing interrogators. The second part article presents power transmission lines, shrinkage concrete structures, spatiotemporal measurement variations between groundwater surface water (GW-SW).

Human Body Communication (HBC) is a promising wireless technology that uses the human body tissues as signal propagation medium. In HBC, information coupled to through an electrostatic or magnetostatic field via electrodes and captured in another part of using similar electrodes. HBC has lower power consumption than conventional radio frequency (RF) approaches, because it operates at frequencies, usually between 0.1 MHz 100 MHz, avoiding shadowing effects, complex hungry RF circuits...

This article presents a novel way to estimate magnetodielectric composites' complex permittivity ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\varepsilon $</tex-math> </inline-formula> ) and permeability notation="LaTeX">$\mu$</tex-math> ). A methodology based on artificial neural network (ANN) modeling is proposed determine from notation="LaTeX">$S$</tex-math> -parameter measurements around 2.45 GHz,...

Using a new test fixture that allows us to bias the bulk terminal through an additional compensated DC probe, two-port S-measurement-based methodology characterize RF-MOSFETs in common-source configuration is herein presented. In addition obtaining S-parameters at different bulk-to-source voltages using single configured test-fixture, proposal analysis of electrical parameters MOSFET are influenced by substrate effect when frequency rises. Physically expected results obtained for device's...

This paper shows the results of temperature measurements on an overhead power transmission line segment under controlled conditions using Fiber Bragg Grating (FBG) sensors. An optical fiber with three FBG sensors enclosed in copper was characterized and then attached along to perform measurements. It found that variations due wind environment can be as high 30°C those increase current conductor increases sometimes exceeding maximum allowable.

This paper proposes a new technique for Human Body Communication (HBC) that uses the magnetic coupling in transmitter and receiver. A discussion about presence of parasitic paths, when is used transmitter, electrical receiver presented; showing presented here, reduces influence surrounding environment at same time simplifies conventional reception schemes. In addition, physical-based model presented, obtaining good model-experiment correlation up to 20 MHz. results suggest possibility use...

Multi-Finger MOSFETs are used to decrease the gate resistance in order improve microwave-operation figures-of-merit such as maximum frequency of oscillation. Even though effect splitting electrode on associated has been extensively analyzed, corresponding influence source-drain resistances not subject much research. We herein present an analysis series parasitic with different number fingers.

The identification of different plastic materials in pellet form using a microwave negative-order-resonance sensor along with the evaluation classification algorithms from machine learning is presented this paper. Operation within unlicensed ISM 2.5 GHz band, and based on measured resonant parameters sensor. Several classifiers are used to process having uncertainty factors involved measurements (air gaps, positions, dimensions shapes), performance comparison between carried out terms...

The widespread utilization herbicides in modern society and their dispersion through wastewater have resulted extensive contamination of source drinking waters, particularly several recent studies showed the glyphosate has potential adverse health effects. Therefore, develope accurate methods to sense analyzed levels water become most relevant. In this regard, paper presents a Complementary Split Ring Resonator (CSRR) sensor design that uses novel method for differentiate permittivity...

We present a circuit model and parameter determination methodology for test fixtures used on-wafer S-parameter measurements on CMOS devices. The incorporates the frequency dependence of series resistances inductances due to skin effect occurring in metal pads. Physically based representations this allow excellent theory-experiment correlations different dummy structures, as well when de-embedding transistor up 60 GHz. © 2012 Wiley Periodicals, Inc. Int J RF Microwave CAE 23: 655–661, 2013.

A model for integrated spiral inductors which incorporates the physically expected frequency-dependent effects modifying device's impedance is proposed. Moreover, it demonstrated that effect of resonances occurring outside bandwidth applicability device may considerably influence performance around peak Q-factor versus frequency curve. In this paper, we present use cascaded resonant circuits to represent additional in improve accuracy up 60 GHz.

This paper presents a methodology to model SiGe HBTs biased in common-emitter and common-base configurations including the bias-dependent substrate parasitics, which allows determining more suitable configuration achieve maximum power gain at different frequency ranges. Model-experiment correlations up 100 GHz for bias conditions verify validity of proposed circuit representations using same values parameters both configurations.

In this paper, transmission-line theory is applied to implement a physical model for compact one-turn inductors, which simultaneously incorporates the frequency-dependent effects introduced by conductor skin effect and loss originated coupling with ground plane. For purpose, S-parameter measurements are processed extract associated parameters, exhibit scalability turn radius. This allows be used interpolation extrapolation analyses. regard, device performance assessed inductors in series...

Human body communication (HBC) technologies have vast potential in the healthcare landscape. This work focuses on Magnetic Body Communication (MHBC), supporting for first time that this technique is more efficient when planar inductors are used as transceivers. A systematic study was performed to establish most appropriate way excite signal into human improve channel usability and provide a design criterium transceiver designers. Furthermore, physical-based model proposed tested against...

In this paper, experimental parameter determination was performed in order to define the feasibility use encoded FBG as reliable temperature sensors, determining that each sub-band forming encrypting code maintains integrity of spectra for a useful operation range 0ºC 60ºC.

Nowadays, microstrip patch antenna arrays are an important part of radar applications. In fact, due to their advantages such as small size, simple and economical fabrication, these structures used transmitters receivers in radars operating at 24 GHz. At frequencies, there several considerations that designers must take into account, one which is the appropriate coupling feed. this work, a 4x1 array using conventional stepped impedance transitions designed compared proposed taper-based...

The design, fabrication and experimental test of a microstrip two-pole directional filter based on new approach consisting hybrid-mode resonators is presented in this paper. use hybrid even-mode odd-mode allows the structure to be composed by two stages having bandstop behavior, following symmetrical configuration, which turn makes it easier design adjust while keeping low dimensions. proposed designed operate over uplink channel 1.8 GHz band used for mobile communications with 4 % bandwidth.

Temperature measurements on overhead lines using FBG sensors were performed. Sensors wrapped with copper wire for thermal transfer purposes. Influence of wind speed, solar irradiation, rain, environment temperature, conductor measured.