Summary The two-scale model for simulating carbonate acidizing has gained substantial attention recently. Five studies dealt with matching experimental data studying regular acid. Four considered limestone samples, while the fifth examined one dolomite core face dissolution. previous work only pore volume (PV) to breakthrough (PVBT) match results. Researchers assumed linear kinetics hydrochloric acid (HCl) reaction and relied on changing Carman-Kozeny exponents data. Unlike studies,...

ABSTRACT In this article, a dual‐band coaxial‐fed 2 × rectangular U‐Slot microstrip patch antenna array for multiple input output applications, in 4G long term evolution (LTE) and WiMAX systems, is presented. The targeted frequency bands are: (1) LTE Band‐1 at 2.1 GHz, (2) 3.5 GHz. Simple design procedure optimization techniques are discussed to achieve the desired parameters. Antenna simulation performed Agilent ADS Momentum using RT/Duroid substrate (ε r = 2.2 h 3.175 mm). Substrate losses...

An alternative method of transcutaneous wireless optical energy supply to an artificial cardiac pacemaker has been conceived, thereby negating the possibility electromagnetic interference. In this research, a comparative analysis is made between two distinct arrays photovoltaic cells, consisting different geometries. Being powered by 5 mW 750 nm laser, that spot size for each topology; both models are tested their ability charge 150 mAh rechargeable LiPo battery, while being embedded...

A compact ultra-high-frequency (UHF) RFID tag with meander feed line and double T-match structure is proposed. The composed of a copper layer at the upper bottom side Rogers 5880 substrate, relative permittivity 2.2 UCODE G2XM/G2XL chip from NXP Semiconductor. overall dimension 58 × 34 0.85 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> not sensitive to objects it attached including metallic object since performance in free air on...

In this paper, the measurement of complex dielectric constant natural rubber at microwave frequencies is reported. A free space, non-destructive technique was used to measure parameter for several samples X band. The were prepared using different amounts carbon filler alter properties so that relation between content and ε <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">r</sub> can be investigated. Our studies show tan δ increase with content....

In this paper, the design, Optimization and simulation of a dual-band coaxial-fed 2×2 rectangular U-Slot microstrippatch antenna array for wireless sensor network applications is presented. It operates on 2.1GHz 3.5GHz bands. A MIMO proposed high speed WSNs based communication standards that in 1-5GHz frequency range. Antenna design performed Agilent ADS Momentum using Rogers TMM3 substrate (εr =3.27 h=6.35mm). The maximum achieved gain for2 x 2 U-slot patch lldBi. Substrate losses are also...

A multiband monopole antenna with minimised ground plane influence for portable devices is presented. This operates at LTE band 13 (0.746–0.787 GHz), GPS, 11 (1.427–1.495 3 (1.71–1.88 WLAN (2.4–2.48 GHz) and WiMAX (3.3–3.88 least −6 dB of reflection coefficient. The performance antennas commonly influenced by the to result in variation terms operating frequency, impedance bandwidth radiation pattern. Via a parametric investigation geometry its integration peripherals devices, it validated...

Principles to determine dielectric constant and loss tangent measurement using Agilent 85070E Dielectric Probe Kit 200 MHz 50 GHz technique is presented in this paper. The experiment objective was measure the of Leucaena Leucocephala (Local Malaysian name Petai Belalang) material that laminated by Polypropylene Polymer. Fabricated proposed boards were studied frequency range 2.2 3.3 since later board will be used ISM band application occupied 2.45 spectrum. parameter composition on paper...

A compact microstrip patch ultra-high-frequency (UHF) RFID tag antenna mountable on metal object is proposed in this paper. The antenna, which has a very simple structure without any shorting pin and plate, composed of meander feed line, rectangular loop double T-match structure. insertion ground plane the design reduces negative impact objects to performance antenna. with overall dimension 58 × 34 0.85 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

This paper presents the design of a compact UHF-RFID tag antenna with several miniaturization techniques including meandering technique and capacitive tip-loading structure. Additionally, T-matching is also utilized in for impedance matching. was designed on Rogers 5880 printed circuit board (PCB) dimension 43 × 26 0.787 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> relative permittivity, □ <sub...

This paper presents a design of Micro-strip patch antenna which operate at medical implantable communication systems (MICS) band (402 MHz to 405 MHz) after implanting in body phantom model with low radiation flexible compact size. For designing the and human model, CST Microwave studio is used. The contains three homogeneous layers as skin, fat muscle. FR4 used substrate thickness 0.5 mm for its flexibility property. ground 0.018 where copper chosen ground. Due biocompatibility, fabricated...

In this article, a high frequency amplifier design method based on the negative impedance compensation has been demonstrated analytically and experimentally. An effective nonlinear model used to simulate harmonic distortion intermodulation factors in design. The simulation measurement results show that, with proposed technique, linearity gain accuracy can be achieved. is particularly suitable for linearisation of RF/microwave amplifiers low open–loop gain.

An odd number of one-wavelength ring resonators are proposed to be directly series-connected along a quarter-wavelength their sides exhibit bandpass response with very high rejection level. As each presents dual-mode response, the order overall will equal two times rings being used. Furthermore, pseudo-elliptic characteristics enhance selectivity resulting filter since transmission zero is obtained at both passband. application concept implemented for case three that exhibits 6 <sup...

In this paper, a novel amplifier linearisation technique based on the negative impedance compensation is presented. As demonstrated by using Volterra model, proposed suitable for linearising amplifiers with low open-loop gain, which appropriate RF/microwave applications. A single-chip CMOS has been designed method, and simulation results show that high gain accuracy (improved 38%) linearity (IMD3 improved 14 dB, OIP3 11 dB adjacent channel power ratio (ACPR) 44% CDMA signal) can be achieved.

The double gate MOSFET, where two gates are fabricated along the length of channel one after another. Design logic is most eminent application Double Gate MOSFET. Gallium nitride (GaN) based metal-oxide semiconductor field-effect transistors (MOSFETs) shown to be promising for digital applications. This paper describes design and analysis different types using GaN DG-MOSFET. (LG) kept constant at 10.6 nm. voltage varies from 0 1 V device switching turn OFF ON-state. For with HfO2 as oxide,...

The primary target of the research work presented in this paper is producing power through strolling or running. energy harvesting from human motion has become a crucial element because it can decrease charging issue mobile phone any gadget which chargeable. A dynamo attached to our joint parts body like knee Arm. For prototype design, three gear have been used rotate and also increased RPM when part will move. When desired device starts rotating, produce. By utilizing movement hand...

The design of the filtenna with bandstop element for Ultra-Wideband (UWB) is presented in this paper. proposed fed 50Ω microstrip feedline and open stub resonator integrated into structure to provide band-rejection characteristics. In order avoid electromagnetic interference due existing wireless local area network (WLAN) overlap UWB operating frequency, a single are designed omit possible between these two systems. To achieve desired parameters optimized. Total dimension 30mm × 40mm....

In this paper the presented research work analyzes effects of electromagnetic (EM) radiation mobile phone on human head. The EM is measured based Specific Absorption Rate (SAR). head generally exposed to phones operating at communication (GSM, CDMA etc) frequency bands. absorption analyzed through simulations by applying domain using Comsole Multiphysics software. specific rate (SAR) was for different positions phone. SARs exhibited in much lower values as held far position from brain. This...

This paper presents the design of a 1×4 microstrip array antenna operating at 6.3GHz for C-band communication satellite application. The project aims to investigate ability control direction main lobe through systematic least mean square method and validate accurate electromagnetic analysis. element consists rectangular patch fed by inset feed. single size feed position is obtained theoretical calculation, MATLAB CST Studio software simulation. Based on design, an four elements with equal...