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1

High Gain WAT Antenna for 38 GHz 5G Systems

Przesmycki Rafał, Bugaj Marek

Journal of Telecommunications and Information Technology

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2023

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nr 4

76--82

EN

The article presents a high gain WAT microstrip antenna designed for 5G communication systems operating in the 38 GHz band. The antenna concerned has a compact structure with dimensions of 5. 16× 5. 05 mm. Rogers RT5880 laminate with a dielectric coefficient of 2. 2 and a thickness of 0. 254 mm was used as its substrate. The antenna works at a center frequency of 38 GHz and is characterized by a low reflection coefficient of – 29 .11 dB, a high energy gain of 7. 61 dB and a wide operating band of 1 .21 GHz (3. 18%). The paper presents an analysis of the simulation results and measurements of the device’s electrical parameters and radiation patterns.

2

Design and Analysis of a Low-profile Microstrip Antenna for 5G Applications using AI-based PSO Approach

Kundu Krishanu, Bhattacharya Ankan, Mohammed Firdous Hussain, Pathak Narendra Nath

Journal of Telecommunications and Information Technology

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2023

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nr 3

68--73

EN

Microstrip antennas are high gain aerials for low-profile wireless applications working with frequencies over 100 MHz. This paper presents a study and design of a low cost slotted-type microstrip patch antenna that can be used in 5G millimeter wave applications. This research focuses on the effect of ground slots and patch slots which, in turn, affect different antenna parameters, such as return loss, VSWR, gain, radiation pattern, and axial ratio. The working frequency range varies from 24 to 28 GHz, thus falling within 5G specifications. A subset of artificial intelligence (AI) known as particle swarm optimization (PSO) is used to approximatively solve issues involving maximization and minimization of numerical values, being highly challenging or even impossible to solve in a precise manner. Here, we have designed and analyzed a low-profile printed microstrip antenna for 5G applications using the AI-based PSO approach. The novelty of the research is mainly in the design approach, compactness of size and antenna applicability. The antenna was simulated with the use of HFSS simulation software.

3

A Comprehensive Review of the Quadratic High Gain DC-DC Converter for Fuel Cell Application

Jayachandran Divya Navamani, Sathik Jagabar, Padhi Tanmay, Kumari Aditi

International Journal of Electronics and Telecommunications

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2022

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Vol. 68, No. 2

299--306

EN

In the recent times, lot of research work carried out in the field of fuel cells explicitly divulges that it has the potential to be an ultimate power source in upcoming years. The fuel cell has more storing capacity, which enables to use in heavy power applications. In these applications, power conditioning is more vital to regulate the output voltage. Hence, we need a dc-dc converter to provide a constant regulated output voltage for such high-power system. Currently, many new converters were designed and implemented as per the requirement. This paper has made comparative study on several topologies of the quadratic high gain dc-dc converter and the applications where these topologies can be used when the fuel cell is given as a source. Also, we have compared various parameters of all the converters considered and generated the results with steady-state and dynamic study. In this article, we briefed the types of analysis carried on the dc-dc converter to study its performance. Moreover, various application of fuel cell is presented and discussed. This paper will be a handbook to the researchers who start to work on high gain dc-dc converter topologies with quadratic boost converter as a base. This article will also guide the engineers to concentrate on the fuel cell components where it needs to be explored for optimizing its operation.

4

High gain of UWB CPW-fed Mercedes-shaped printed monopole antennas for UWB applications

Al-Gburi Ahmed Jamal Abdullah, Ibrahim IM, Zakaria Z., Zeain Mohammed Yousi, Alwareth Husam, Ibrahim Ayman Mohammed, Keriee Hussam Hamid

Przegląd Elektrotechniczny

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2021

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R. 97, nr 5

70--73

EN

This paper proposes a high gain, and a new shape of an Ultra-wideband (UWB) Mercedes-Shaped printed monopole (MPM) antenna feds by a coplanar waveguide (CPW) designed to use for UWB applications. The Mercedes patch shaped consists of a circular ring embedded with threelegged leads to enhance the antenna bandwidth. The antenna has an electrical dimension of 1.2λo× 1.2λo× 0.039λo at the centre operating frequency of 7.35 GHz. The MPM antenna provides a bandwidth of 10.5GHz covering the licensed UWB frequencies, starting from 2.1 GHz to12. 6 GHz. The MPM antenna exhibited a max gain of 6.88 dB at 8.6 GHz with a significant radiation efficiency of 97.4%. The coverage bandwidth of the proposed MPM antenna is wide enough to be used for UWB and radar applications.

PL

W artykule zaproponowano duży zysk i nowy kształt ultraszerokopasmowej (UWB) drukowanej anteny jednobiegunowej (MPM) w kształcie Mercedesa, zasilanej przez falowód współpłaszczyznowy (CPW) zaprojektowanej do zastosowań UWB. Element w kształcie Mercedesa składa się z okrągłego pierścienia osadzonego w trójnożnych przewodach w celu zwiększenia przepustowości anteny. Antena ma wymiar elektryczny 1,2λo × 1,2λo × 0,039λo przy środkowej częstotliwości roboczej 7,35 GHz. Antena MPM zapewnia szerokość pasma 10,5 GHz pokrywającą licencjonowane częstotliwości UWB, zaczynając od 2,1 GHz do 12. 6 GHz.

5

A mirrored modified hybrid switched inductor high gain DC-DC boost converter

Feizi Hamideh, Gholizadeh-Roshanagh Reza, Mohebbifar Minoo

Journal of Power Technologies

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2021

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Vol. 101, nr 3

135--143

EN

A mirrored modified hybrid switched inductor high gain dc-dc boost converter is proposed in this paper. In this topology, input voltage source is divided into two equal parts and they are embedded in series with the converter inductors. This leads to a reduction in voltage stress across the capacitors. In addition, two mirrored boost converters with switched inductor are connected to each other. By replacing a switched inductor with the main inductor of the boost converter, the output voltage range is developed. This delivers high voltage gain for the proposed converter. The voltage gain, voltage stress across capacitors and current ripple of inductors of the proposed converter are compared with the conventional boost converter and hybrid switched inductor boost converter. The accuracy and performance of the proposed converter are reconfirmed through comparing simulation results of EMTDC/PSCAD software with the mathematical calculations. The main advantages of the proposed topology are high voltage gain, low voltage and current ripples and particularly low voltage stress on the capacitors.

6

Performance and stability analysis of series-cascaded, high-gain, interleaved boost converter for photovoltaic applications

Prasanna Kumar C., Venugopal N.

Power Electronics and Drives

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2018

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Vol. 3 (38), No. 1

85--97

EN

Interleaved boost converters (IBCs) are cascaded in parallel in most of the applications. This novel approach connects IBC in series cascade. The IBC has an optimal operating duty cycle of 0.5. Normally, photovoltaic source voltage is low because of space constraints. In order to boost the source voltage, a conventional boost converter is replaced with series-cascaded IBC in this paper. The single-stage IBC also boosts the voltage to twice the input voltage. In the proposed converter, output voltage is about four times the input voltage with the same 0.5 duty cycle. A mathematical model is developed and simulated for the proposed work in MATLAB/Simulink platform. The output of the proposed circuit is analysed through fast Fourier transform to know the harmonic content due to the switching. The system is tested for stability with signal-flow graph modelling. The proposed work is realised using hardware and tested to validate the model.