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Improvement of THz waveguides with reduced losses has seen a rapid progress in the recent years. Among designs with the low loss, Planar Goubau Line have been designed and fabricated on high resistivity silicon substrate. In this contribution, we discuss two kinds of Planar Goubau lines: rectangular cross section line for low loss transmission and corrugated line in order to slow down and confine...
We present low loss microstrip transmission line with compact transitions from coplanar waveguide for sub-terahertz applications. The microstrip (MS) transmission line is fabricated on the surface of a thin cyclic olefin copolymer dielectric layer. Among different optimization parameters, we present here the influence of CPW-to-MS transition length. Low loss transmission of the MS line has been demonstrated...
In practical applications, compensating the changes in transistors input and output impedances due to environmental and thermal effects requires tunable matching networks. Having tunability property is critical in manufacturing as well, since manufacturing errors may be compensated by post-production tuning. In this paper, a 12–50 Ω impedance transforming filter over 800–2200 MHz frequency band is...
In this work, we present a multiband metamaterial-inspired antenna. The proposed structure consists of a printed dipole antenna with two Split Ring Resonators (SRRs) and one director element. The addition of the resonators and the director leads to new resonance frequencies lower than that corresponding to the dipole alone with different radiation patterns. Simulation and measured results of return...
This paper investigates the decoding of rate 1/2 Non-Binary LDPC codes using a non-iterative approach based on the Maximum-Likelihood (ML) principle. The iterative decoding approach based on the well known Extended-Min-Sum (EMS) algorithm, considered as the most efficient decoding algorithm to decode NB-LDPC codes, executes the decoding process iteratively. The main operations of this algorithm are...
The frequency dependence of the dielectric permittivity and the loss peak in the microwaves area, of a substance with high dielectric constant such as recinoleic acid oil, are the key parameters that can lead to overheating of the tumor by microwave radiation. The radiation at a specific high absorption frequency of the dielectric substance injected in the tumor, causes the cancerous cell necrosis...
An eight element linear iris excited centered broadwall waveguide slotted array antenna is realized at 10GHz using FEM simulator. Different feeding arrangement is illustrated with proper electric field magnitude and phase distribution for obtaining higher gain and lower first side lobe level. 15.01dB gain with zero beam tilt and −14.89dB side lobe level is achieved in center fed case with 2.88dB improvement...
A printed elliptic UWB reconfigurable dual band-rejected antenna operating from 0.75 to over 6GHz was designed and performed for multi-standard telecommunication systems such as GSM 850, GSM 900, LTE, ISM 868, WiFi, WLAN, WiMAX… The main antenna consists of a very high selective UMTS (2.1 GHz) band-rejection micro-strip fed monopole. The reconfigurable discarded bands were obtained by printing two...
The hardware simulator facilitates the test and validation cycles by replicating channel artifacts in a controllable and repeatable laboratory environment. After a description of the MIMO channel models and the hardware simulator architecture, this paper presents new implementation algorithm of its digital block. The proposed algorithm allows the selection of specific environments and various scenarios,...
This paper investigates the decoding of rate 1/2 Non-Binary LDPC codes using a non-iterative approach based on the Maximum-Likelihood (ML) principle. The iterative decoding approach based on the well known Extended-Min-Sum (EMS) algorithm, considered as the most efficient decoding algorithm to decode NB-LDPC codes, executes the decoding process iteratively. The main operations of this algorithm are...
In this paper, the propagation of electromagnetic waves through an infinite slab of biaxial chiral medium is analytically formulated for an arbitrary incidence using the 4×4 transition matrix method. In this powerful method, a state vector differential equation is extracted whose solution is given in terms of a transition matrix relating the tangential field components at the input and output planes...
A hepta-band dielectric loaded Minkowski Fractal Slot Antenna is presented in this article. Fractal geometry is utilized to generate multiple frequency bands conforming to various wireless standards. The idea behind placement of the dielectric resonator is to increase the impedance bandwidth at the upper frequency band. The proposed antenna exhibits a hepta-band performance over the frequency range...
Low frequency (LF) noise and especially trap assisted GR noise in semiconductor devices does not affect only the performances of radio frequency (RF) and microwave transmitters (oscillators) but also that of receivers (local oscillators, mixers). Measurement and simulation characterization tools of semiconductor devices become crucial in order to optimize their characteristics and circuit performances...
A simple planar ultra-wideband (UWB) microstrip-fed antenna with defected ground structure and two parasitic patches is presented. Two symmetrical quarter-circle shaped segments are cut both on the each of lower edges of the radiating patch and on the each of upper edges of the ground plane. These segments provide a wider bandwidth than the ordinary rectangular antenna especially in the middle frequencies...
Ageing of organic solar cells is still a problem to resolve before these devices can reach the market. This question can be addressed using different strategies including encapsulating materials, device design and buffer layers, with the latter being addressed in this paper. The shelf life of un-encapsulated small-molecule organic solar cells, (ITO/PEDOT-PSS/CuPC/C60/buffer layer/Al), have been studied...
A high efficient GaN HEMT power amplifier with a new topology is presented for to be used at 3.4-3.7 GHz band. Short sections of the Microstrip-lines are used as harmonic traps at the load network in order to improve the efficiency. The fabricated GaN HEMT amplifier delivers 37.5 dBm saturated output power and the maximum power-added efficiency of 80% and a maximum drain efficiency of 83% are obtained...
In this paper, microstrip transmission lines and antennas realized on Molded Interconnect Devices (MIDs) are presented. Measurements of two transmission lines realized by LDS on LCP vectra E820i substrate and inkjet printing on ABS PC substrates allowed the extraction of LCP vectra E820i and ABS PC permittivities. Measurement results show that lower losses are obtained with the LDS fabrication technique,...
We describe a contactless technique for dielectric permittivity characterization using a resonant near-field scanning microwave microscope. By measuring the shift in the system's resonant frequency as we scan over an insulating sample, we obtain quantitative images of dielectric variations. This system is composed of a probe coupled to a dielectric resonator.
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