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This paper investigates the electromagnetic performance of the microstrip square spiral resonator in the design of bandpass filters based on coupled resonator circuits when compared to the performance of the square open-loop resonator at the same center frequency. A full-wave EM simulator is used to calculate the resonance frequency which is plotted against the spacing between the closest lines of...
In this paper, we propose two adaptations of the Power Series Routing (PSR) algorithm for transparent elastic optical networks: PSR algorithm with normalized distance and slot availability (PSRNDA) and PSR algorithm for normalized distance and slot contiguity (PSRNDC). In our analysis, we consider amplified spontaneous emission as physical impairment, different modulation formats and bit transmission...
We study the magnetic near field resonance wireless power transfer systems based on high refractive index dielectric resonators. We propose to operate at higher-order (multipole) modes of high refractive index dielectric resonators instead of magnetic dipole mode in the metallic coils and numerically demonstrate the higher efficiency due to minimization of the radiation losses. Moreover, the system...
In this work we experimentally revise electromagnetic bandgap properties of high-impedance metasurfaces of the mushroom type and study their capabilities in decoupling elements of body-array coils for 7T MRI. We numerically optimize unit-cell parameters in order to improve isolation of densely packed dipole-type antennas operating at 298 MHz. We demonstrate by measurements, how the reachable isolation...
Researches on modern wireless identification methods have been focused on RFID techniques and in particular on chipless solutions. A parametric study of folded multi-layer C-sections fabricated on flexible substrates and a chipless RFID tag with single group of folded C-sections are presented in this paper. Full-wave simulations have been done for the folded multi-layer C-section and the chipless...
A high power nickel based electroplated 4-bit RF MEMS capacitors bank is designed, fabricated and tested. The proposed design is capable to handle high power up to 30 Watts and utilizes co-planar transmission lines that use eight latching SPDT RF MEMS switches. The capacitors bank design is made of 4 cascaded bit units where every bit has two different paths, the first path is a conventional CPW while...
This paper presents a fully integrated BPSK (Binary Phase Shift Keying) Transmitter Front End for Ultra-Wideband (UWB) applications, designed in 130 nm CMOS technology. A simple architecture based on parallel pulse generator blocks in parallel is proposed to produce 9th derivative Gaussian pulses. In addition to the pulse generator, the circuit comprises a passive balun circuit, a common source amplifier,...
Spectrum-sliced elastic optical path networks (SLICE) can maximize spectral resource utilization by using a fine granular spectrum range unit, called frequency slot, and allowing that multiple slots be assigned to lightpaths. The Routing and Spectrum Assignment (RSA) algorithm has a direct influence on the spectral resource utilization. We propose in this paper a novel routing algorithm, referred...
This article presents a photonic circuit that achieves direct carrier BPSK modulation of a RF signal from an opto-electronic oscillator suitable for satellite telemetry and control. The circuit was implemented with two Mach-Zehnder optical modulators. The optical wavelength is 1550 nm. One modulator was used to construct an optoelectronic oscillator to generate a carrier with frequency equal to 2...
This paper proposes a substrate integrated waveguide (SIW) 180 degrees hybrid coupler with an integrated filter. This device operates at 24.1 GHz for radar applications and the filter removes the frequency of 22.1 GHz coming from the local oscillator. This device is the RF passive part of a single balanced diode mixer. The passive part has been designed, fabricated and measured.
This paper presents an FPGA implementation of the front-end of a single-carrier coherent optical receiver for optical networks. The receiver is based on a number of spectral-efficient techniques, such as polarization multiplexing and 16-QAM modulation formats. The FPGA implementation was tested with received traces (time series) obtained from optical simulation for scenarios that operate with channel...
The authors present a novel compact 3-bit interferometer based on Hilbert fractal geometry for application to Instantaneous Frequency Measurement (IFM) system operating in the range 4.66–6.38 GHz. The interferometers use two-way Wilkinson power dividers connected to two microstrip line with different signal delays, where one of these microstrip lines is based on Hilbert fractal curve. A full wave...
In this paper, the performance of satellite image transmission over binary erasure channel was evaluated, when the image is compressed using the algorithm recommended by Consultative Committee for Space Data Systems (CCSDS). The transmission was software simulated using a test set of 2,000 images from CBERS-2B and considering three different scenarios: (a) with no channel code, (b) using a LT-code,...
Metamaterials are composite structures designed to produce the properties which are not available in nature and control electromagnetic waves in any desirable ways. A special class of wire metamaterials consists of periodic arrays of parallel conducting wires (the so-called wire medium), and they provide many opportunities to shape the form of electromagnetic field being especially promising for Magnetic...
Presents the assessment of 16 FM stations cover-age held in the metropolitan region of São Paulo, pointing methodologies for prediction and measurement adopted by Anatel, analyzing the coverage gaps and showing, by simulations, the variations that the installation and operation features can causing to the coverage of a station, directly linked to the quality of service. The installation can be adjusted...
This paper presents an analysis of the mutual interference among users' equipment for channels with local scatterers, such as buildings, trees and other urban elements. In this scenario, the signals that arrive at a linear array with symmetric excitation of the array elements, considering the directions of arrival (DoA), are modelled using Gaussian and Uniform distributions. It is shown that the symmetric...
Advanced lumped-element immittance inverters supporting dual-frequency operation and tunability of operational frequencies are the key enablers to design small-size tunable dual-bandpass filters. The paper presents a design concept of tunable dual-frequency immittance inverters based on the dual-composite right/left-handed transmission line (D-CRLH TL) unit cells with variable capacitors. Tunability...
This paper presents the development of a printed antenna array based on Sierpinski carpet fractal elements. Its main goal is to increase the array directivity by means of ensuring the radiation beam maximum direction in the perpendicular plane of the array axis. Each element individually operates from 2.0 to 20GHz and the three-elements antenna array has been designed for providing a gain enhancement...
This paper describes the design, modelling and characterization of transmission lines for millimetre wave silicon integrated circuits up to 65 GHz. The simulation results of three different EM simulators for a selected hybrid coplanar layout structure are presented. Two different deembedding methods are investigated and compared with respect to sensitivity to typical measurement errors. Finally both...
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