A miniaturized antenna employing a negative index metamaterial with modified split-ring resonator (SRR) and capacitance-loaded strip (CLS) unit cells is presented for Ultra wideband (UWB) microwave imaging applications. Four left-handed (LH) (MTM) are located along one axis of the as radiating element. Each cell combines to obtain design architecture that simultaneously exhibits both permittivity permeability, which ensures stable refractive improve performance imaging. The structure,...

A compact antenna is proposed using planar‐patterned metamaterial structures for ultra‐wideband applications. This consists of four unit cells that simultaneously show both negative permeability and permittivity on the triangular patch three rectangular slots partial ground plane fed with a microstrip line. It has wide bandwidth from 3.07 to 19.91 GHz voltage standing wave ratio (VSWR) <2 an average gain 5.62 dBi peak 8.57 because structures. Good agreement between computations...

This paper presents a negative index metamaterial incorporated UWB antenna with an integration of complementary SRR (split-ring resonator) and CLS (capacitive loaded strip) unit cells for microwave imaging sensor applications. consists four along one axis, where each cell incorporates pair. enables design layout that allows both value permittivity permeability simultaneous, resulting in durable to enhance the performance The proposed MTM was designed fabricated on FR4 substrate having...

Subsynchronous resonance (SSR) damping in fixed-speed wind turbine generator systems (FSWTGS) by using two series flexible ac transmission system (FACTS) devices, the thyristor-controlled capacitor (TCSC), and gate-controlled (GCSC) are studied this paper. The former is a commercially available FACTS device, latter second generation of devices gate turnoff (GTO) or other gate-commuted switches. GCSC characterized fixed parallel with pair antiparallel switches enabling rapid control impedance...

The design of a compact metamaterial ultra-wideband (UWB) antenna with goal towards application in microwave imaging systems for detecting unwanted cells human tissue, such as cases breast cancer, heart failure and brain stroke detection is proposed. This proposed UWB made four unit cells, where each cell an integration modified split ring resonator (SRR), capacitive loaded strip (CLS) wire, to attain layout that simultaneously exhibits both negative magnetic permeability electrical...

The dual‐band operation of a microstrip patch antenna on Duroid 5870 substrate for Ku‐ and K‐bands is presented. fabrication the proposed performed with slots dielectric excited by 50 Ω transmission line. A high‐frequency structural simulator (HFSS) used which based finite element method (FEM) in this research. measured impedance bandwidth (2 : 1 VSWR) achieved 1.07 GHz (15.93 GHz–14.86 GHz) lower band 0.94 (20.67–19.73 upper band. stable omnidirectional radiation pattern observed operating...

Value-Added Tax (VAT) is a key revenue source for Bangladesh, yet its implementation at the trading stage remains underutilized due to low compliance, administrative challenges, and inadequate enforcement. Despite over 2.5 million wholesale retail trade establishments, VAT registration among traders only 2.8%, contributing mere 1.5% of total revenue. This study examines compliance gaps, enforcement issues affecting in Bangladesh. The findings highlight complex processes, lack awareness,...

In this paper, an X-band microstrip patch antenna has been presented with enhanced bandwidth. The proposed is designed on 40 mm×40mm printed circuit board and excited by line. Commercially available High Frequency Structural Simulator (HFSS) adopted in study This composed of rectangular circular slots to generate two resonances increase bandwidth the desired band. Return loss -17.14 dB -14.29 are obtained below -10 (8GHz-12GHz). It achieved stable radiation efficiency 78.85% average peak...

Introduction Anemia is a common problem in children particularly developing countries and taking steps to tackle it one of the major public health challenges for Nepal. The objective this study investigate prevalence individual, household community level determinants childhood anemia Methods Data was taken from nationally representative sample 1,942 Nepalese aged 6–59 months. Chi-square test used determine bivariate relationship between selected variables multilevel logistic regression model...

A compact microstrip line-fed antenna is presented with five band-notched characteristics for UWB microwave applications. Five have been achieved at the frequencies of 3.6, 5.2, 5.8, 7.5, and 8.3 GHz inseminating three C-shaped slots on radiating circular patch two partial ground plane, which validated experimentally by fabricating a printed prototype. This exhibits nearly omnidirectional radiation pattern better surface current flow gain 1.62 dBi. proposed VSWR < 2 dimensions 25 × 31 mm2...

Undoped and B/Sn-doped ZnO nanoparticles are successfully produced by a simple mechanochemical method, characterized XRD, FTIR, EDX, SEM, XPS BET techniques. The XRD studies reveal that the prepared possess hexagonal wurtzite structure of ZnO. presence various functional groups (–OH, –CH, Zn–O) observed FTIR. It is clear from EDX analysis B, Sn, Zn O elements present in nanoparticles. SEM images confirm relatively smooth surface results indicate B Sn doped into matrix. photocatalytic...

A double inverted F-shape patch antenna is presented for dual-band operation. The proposed comprised of circular and rectangular slots on a printed circuit board 40 mm × 1.6 with 50 Ω microstrip transmission line. Commercially available high frequency structural simulator (HFSS) based the finite element method (FEM) has been adopted in this investigation. It measured impedance bandwidths (2 : 1 VSWR) 18.53% lower band 7.8% upper band, respectively. achieved stable radiation efficiencies...

To realize the benefits of SiC power electronics and optically controlled device technology, we present in this letter activated p-i-n diodes for high-temperature high-power applications. The were fabricated on an n-type 4H-SiC substrate, measurements show that, when tested at a reverse bias 1000 V, diode was switched by single UV (337.1 nm) laser pulse with 1.2-mJ optical energy. FWHM is about 180 ns rise time less than 10 fall 200 ns. response primarily limited RC constant from junction...

ABSTRACT A printed microstrip line‐fed fractal antenna is presented with a high fidelity factor for UWB applications. The structure of electrical dimension 0.24 λ × 0.33 at lower frequency 3.1 GHz made patch, slotted partial ground plane, and feed, which fabricated on FR4 material low cost dielectric. Measured results demonstrates that the achieves fractional bandwidth 117.88% covering range from to more than 12 maximum gain 3.54 dBi 6.25 GHz. An acceptable analogy observed between measured...

A band-removal property employing microwave frequencies using complementary split ring resonators (CSRRs) is applied to design a compact UWB antenna wishing for the rejection of some frequency band, which meanwhile exercised by existing wireless applications. The reported comprises optimization circular radiating patch, in slotted SRRs are implanted. It printed on low dielectric FR4 substrate material fed partial ground plane and microstrip line. Validated results exhibit that shows wide...

This paper presents an experimental investigation carried out to study the effects of Ground Granulated Blast Furnace Slag (GGBFS) on strength development mortar and optimum use slag in mortar. Cement was partially replaced with seven percentages (10%, 20%, 30%, 40%, 50%, 60% 70%) by weight. Ordinary Portland cement (OPC) also prepared as reference A total 400 cube briquet specimens were cast compressive well tensile determined at curing age 3, 7, 14, 28, 60, 90 180 days. Test results show...

In this article, a negative index metamaterial antenna is presented for ultrawideband (UWB) microwave imaging applications. Four left-handed (LH) (MTM unit cells are located along one axis of the as radiating element. Each cell assembles modified split-ring resonator with capacitance-loaded strip to obtain design architecture that at time shows both permittivity and permeability, which assures stable refractive raise performance imaging. The structure dimension 16 × 21 1.6 mm3 printed on low...

The increasing deployment of wind power generation is leading to the integration large farms into distribution grid. Given remote geographic location farms, series capacitive compensation commonly used ensure stable transmission over long distances. However, sub-synchronous resonance (SSR) phenomenon presents potential risks in a compensated farm. Although SSR problem traditional systems well-known and has been extensively studied literature, series-compensated requires more study analysis....

Abstract In this paper, a novel bird face microstrip printed monopole ultra-wideband (UWB) antenna is investigated. The proposed compact consists of ring-shaped with additional slot and slotted ground plane on FR4 material. overall electrical dimension the 0.25 λ×0.36 λ×0.016 λ energized by feed line. Computer Simulation Technology (CST) High Frequency Structural Simulator (HFSS) applied in analysis. impedance bandwidth cover 3.1–12.3 GHz (9.2 GHz, BW) frequency range. messurement displayed...

In this paper, a disc-shaped monopole antenna has been investigated for super-wideband applications with structure of parasitic element. The proposed SWB consists patch and partial ground plane element 4 rec tangular embedded slots on the plane. This leads UWB frequency band into band. is fed by microstrip line printed low dielectric FR4 material 1.6 mm thickness. All simulations are performed using commercially available, finite method (FEM) based Ansoft high-frequency simulator (HFSS)...

The traditional method for the analysis of power quality (PQ) disturbances is fast Fourier transform (FFT) which suffers from spectral leakage phenomenon, and results in erroneous assessment presence nonstationary PQ disturbances. Also, it cannot provide any time information as indices are computed frequency domain only. Regarding limitations FFT, this paper Page time-frequency distribution (TFD) utilized three-phase nonstationary, nonsinusoidal, unbalanced Utilizing TFD technique, such...

In this paper, a circularly polarized antenna is proposed for satellite communication system. Commercially available Finite Integration Technique (FIT) based software Computer Simulation Technology (CST) microwave studio and finite element method solver High Frequency Structural Simulator (HFSS) have been used in analysis. The achieved 3dB axial ratio of 30 MHz with -10dB reflection coefficient. coefficient has verified both CST HFSS simulation software. operating frequency the 2.35 GHz....

A circular polarized highly directional S band patch antenna for small satellite applications has been proposed in this invention. The comprises of a square ground plane and two radiating patches with annular slot fed by coaxial probe. the r adiating is responsible creating resonance at band. prototype can be easily integrated due to simplicity design. modification shape cutting slots help excite desired frequency. simulation experimental results have good agreement. achieved an impedance...