1,405 research outputs found
Developing of the smart textile for energy expenditure monitoring
Peer ReviewedPostprint (published version
Study of metamaterial resonators for decoupling of a MIMO-PIFA system
The impact of several subwavelength metamaterial
particles based on split-ring inspired resonators to enhance the
decoupling level in a two planar inverted-F antenna multi-input
multi-output printed circuit board system is investigated. The Sparameters,
antenna performance, electric and magnetic field
distribution are simulated and analyzed by means of the full 3D
electromagnetic simulator CST Microwave Studio at 2.45 GHz.
The obtained results show a notable coupling reduction level in
the three analyzed cases and a trade-off between
isolation/antenna performance/area.Postprint (author's final draft
Evaluation of high definition digital video signal over coaxial transmission lines
In this paper, the propagation of two different digital video transmission standards have been evaluated over fifteen different coaxial cables. The frequency dependence of the attenuation for each cable and the maximum cable length for each standard have been obtained. The results show that the propagation properties improve with the inner conductor thickness and it is better to use coaxial cable with an inner conductor based on several filaments.Peer ReviewedPostprint (author's final draft
Wearable GPS patch ANTENNA on jeans fabric
In this work a wearable GPS adhesive copper sheet patch antenna on jeans fabric is designed,
simulated and tested including the human body impact and specific absorption rate (SAR). The proposed
textile antenna operates at the GPS L1 band (1575.42 MHz) and it has been designed by means of the
commercial full 3D electromagnetic CST Microwave Studio simulator. The original textile antenna presents a
-13.6 dB return loss at the GPS L1 frequency band with a fractional bandwidth of BW=3% (at S11=-10 dB),
with a gain G= 1.7 dBi and efficiency Âż =23.1%. A homogeneous phantom has been considered in order to
simulate the SAR in the leg of an average human body. The impact of the human body on the antenna
performance implies a detuning frequency of 1.6% and G= 1.2 dBi; Âż =19% at the GPS operation frequency.
In addition, several bending scenarios have been simulated to determine the degradation of the return loss,
realized gain and efficiency. The proposed antenna is compliant with specific absorption rate (SAR)
requirements from the IEEE C95.3 standard.Postprint (author's final draft
TIEG: basic information of the research group
This paper presents a summary of the main activities of research group TIEG (Terrassa Industrial Electronics Group). The group objectives are basically focused on four main areas, i.e. Electromagnetic Compatibility (EMC) in power systems ; EMC in integrated circuits ; power electronics for energy management ; power electronics for motion controlPeer Reviewe
Differential and common-mode filters based on metamaterial resonators
Two different techniques based on metamaterials
for mitigating both the differential and common-mode
propagation in differential signaling are addressed. The proposed
filters are implemented by means of complementary split ring
and spiral resonators applied to coupled parallel microstrip lines.
Frequency response, signal integrity and radiation emission are analyzed.Peer ReviewedPostprint (author’s final draft
Evaluation of operational amplifier immunity by means of Weibull distribution
The immunity of operational amplifiers is a trend
topic for electromagnetic compatibility EMC community.
Radiofrequency interference is usually applied to the operation
amplifier and the voltage offset is monitored as a parameter to
evaluate the EMC degradation. However, this method does not
provide enough information to know the probability of failure to
electromagnetic interference of the devices. In this paper, an
alternative statistical analysis based on the Weibull distribution is
used to analyze the electromagnetic immunity performance of
operational amplifiers under different frequency interferences
and modulation index. The results confirm the feasibility of the
Weibull distribution to evaluate the radiofrequency interference
RFI behavior.Peer ReviewedPostprint (author’s final draft
An alternative characterization method of PFET sub-threshold slope under NBTI stress
The effects of negative bias temperature instability (NBTI) on the sub-threshold performance of a pFET have been investigated by means of experimental methods. Specifically, the sub-threshold slope under static and dynamic NBTI stress has been characterized for different NBTI stress conditions. In order to perform the characterization, a proposal based on an alternative measurement technique to obtain the sub-threshold slope is presented. Our first results indicate that similar sub-threshold slope is obtained in all stress conditions.Postprint (published version
Electromagnetic interference reduction in printed circuit boards by using metamaterials: a conduction and radiation impact analysis
This work aims to compare the implementation of two metamaterials for reducing electromagnetic interference (EMI) in printed circuit boards. Specifically, complementary split-ring resonators (CSRRs) and electromagnetic bandgaps (EBGs) were etched on the ground plane of a microstrip transmission line. Both techniques were compared as EMI filters, taking into account frequency response, signal integrity, and near- and far-field radiation with regard to a reference (solid ground) board. The results of electromagnetic simulations and experimental tests show similar EMI rejection levels in both cases, but CSRRs have a significantly better signal integrity response whereas EBGs behave as lower electromagnetic radiation elements in the operation frequency band.Peer ReviewedPreprin
Characterization and modelling of EMI susceptibility in integrated circuits at high frequency
In this paper an alternative method for characterizing
and modelling the EMI susceptibility in integrated circuits at
frequencies above 1 GHz is presented. The PCB layout design is
focused on the optimization of the impedance mismatch losses on
the radio frequency interference injection path. The PCB has
been tested with several commercial operational amplifiers and
the methodology is validated through both electrical transmission
line simulations and electromagnetic cosimulations.Peer ReviewedPostprint (author’s final draft
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