The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This work presents a theoretical study about the foundations of static electricity and electrostatic discharges (ESD). ESDs can damage electronic devices. The misbehavior can represent a catastrophic failure or a latent malfunction in the device. This article illustrates the waveform of the electrostatic discharges not only in living beings and furniture, but also brings up an electronic circuit capable...
An important figure of merit in magnetic communication systems is the reactive power delivered to the transmitting coil. This work proposes a systematic design approach for magnetic transmitters that emphasizes the limitation of available reactive power. The proposed design is formulated as an optimization problem, in which reactive power of the magnetic transmitter is minimized, under the constraint...
Compressed sensing is an emerging signal processing method that finds applications in diverse estimation problems. This paper shows that power systems events may be analyzed in terms of sparse structures, especially if the probability of their occurrence within a power network is low. The paper presents several examples for such events, and suggests methods for locating them within large power systems...
Performance of software-defined and cognitive radios (SDRs and CRs) is limited by their analog and mixed-signal front-ends and back-ends mostly because conventional sampling and reconstruction (S&R) circuits are inconsistent with the sampling theory. This neglect of the theory hinders the implementation of novel S&R circuits (NSCs and NRCs) based on the direct interpretation of the sampling...
By means of the scattered field singularities localization, optimal antenna synthesis problem solution with predefined pattern directivity is considered. Using the analytical continuation of the scattered field, along and backwards its propagation, could be determined the positions of their singularities. Determining the coordinates of these singularity points with appropriate polarization and placing...
This work proposes a wideband transconductance enhancement CMOS LNA with multiple feedback technique. Two positive-feedback loops are used to alleviate the restricted gm value for input matching of the CG LNA. By using a triple-well process, the bulk cross-coupling connection between the common-gate amplifiers enhances the transconductance (gm) of the input stage, thus saving power consumption and...
We numerically investigated volume loss density and temperature rise generated due to presence of a titanium rod placed in an ASTM F2182-11a high permittivity medium which was excited by radio frequency (RF) 64 MHz plane waves. 3-D electromagnetic and thermal co-simulations were performed for continuous wave and time-varied excitations. If time variable RF excitation that reaches the limit set by...
Noise power and noise figure are detailedly analysed and deduced in theory for mult-port network in active electrically scanned array(AESA) radar, especially in AESA radar. Mathematical expressions of output noise power and total noise figure of network are given out under various conditions. Accordingly, this provides a basis of theories for multi-port network and radar receiver system design, the...
The most commonly used pixel structure in integrated circuit technologies is the three-transistor pixel structure (3-T). This structure consists of a pixel, a reset transistor, a source follower and a pixel select transistor. An extension to this is the 4-T pixel structure where an extra transistor is included to enable current steering in the readout phase and reset phase. This greatly reduces current...
In this article, we discuss the crucial subject of RFID tags with double rectangular spiral antennas, system stability optimization under delayed electromagnetic interference and parasitic effects. Two antennas are connected in series by microstrip line with parasitic effects. We define V1(t) as the voltage on the first antenna inductance and V2(t) as the voltage on the second antenna inductance....
Recent advances in the development of millimeter wave vacuum electronic devices have been made possible by powerful, specialized design tools. We summarize them here and point out areas where improved models and codes will be needed.
This contribution presents a full chip set dedicated to high data rate indoor wireless communication at a carrier frequency of 300 GHz. The analog frontend consists of a three-chip solution, namely a transmitter, receiver and local oscillator frequency multiplier. The active millimeter-wave monolithic integrated circuits are realized in a GaAs-based metamorphic high electron mobility transistor technology...
We present results for simulations of electromagnetic field propagation at 900 MHz in the presence of groups of people. The starting geometry of humans is modeled using combination of programs MakeHuman and Blender. It is then imported into 3-D electromagnetic numerical solver based on surface integral-equation formulation, higher-order basis functions and Galerkin testing, accelerated using graphical...
Today more and more multifunction RF-SIP (System-In-Package) modules, in SMD (Surface-Mount-Technology) package style, come into high volume production phase. There are many challenges in automatic RF measurements of RF-SIP-SMD devices. Each different SIP must have dedicated load-board that contains multiple RF connectors as well as a rigorous RF considerations and design. Furthermore, RF test equipment...
Field effect transistor (FET) or bipolar junction transistor (BJT) based circuits, involving emitter/source degeneration by any general impedance are widely known for their positive effects on circuit performance. The circuit's behavior like input-output impedances, trans-admittance, voltage and power gains of such topologies are well known. In this paper, we propose to analyze the topology by looking...
This article describes an implementation approach for the RF interference cancellation technique in full duplex wireless systems. A detailed analysis of the impairments in the RF system and the implementation of the RF interference cancellation are presented. Measurement results indicate more than 50dB suppression of the RF interference in static environments, considering a 1.9 GHz interference signal...
In a multiconductor transmission lines (MTL) of N+1 conductors it is possible to transmit N independent signals and the reason most applications use less signals is the huge crosstalk and return loss that arises when transmitting so many signals. In a previous work we developed an algorithm for transmitting the maximum number of possible signals without crosstalk or return loss, for lossless lines...
Analysis of the accuracy of EM simulations of antenna arrays and arrays in vicinity of complex structures, where array elements are modeled by using far field sources, is presented in this paper. Antenna arrays with strong mutual coupling between the elements are the main problem under consideration. It is shown that if the antenna elements are minimum scattering antennas fed by current generators,...
A novel iterative physical optics (IPO) algorithm is proposed, for the analysis of scattering from large complex geometries involving multiple reflections and complex self-shadowing effects. The algorithm involves two types of nested iterations: reflection (“bounce”) iterations and self-shadowing iterations. At each bounce iteration, the physical optics sources induced on the surface of the scatterer...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.