Wyniki wyszukiwania - Biblioteka Nauki

1

Dual Band Integrated Wideband Multi Resonating Patch Antenna for C–Band and Ku–Band Applications

100%

Srivastava K. , Singh S. , Singh A. K. , Singh R.

International Journal of Electronics and Telecommunications

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2019

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tom Vol. 65, No. 3

347--352

EN

A wideband antenna with dual band characteristic at 5.33/14.3GHz with resonating frequencies for wireless applications is presented. The strategy of the design is to introduce multiband in antenna band. Bandwidth of the antenna increases by embedding annular ring on the radiating patch and four bands are achieved by introducing coupling gap between the patches. Surface current distribution is analyzed at different resonating frequencies for understanding the radiation mechanism and effect of annular ring. The antenna parameters such as return loss, radiation pattern, gain, VSWR and group delay are discussed. The impedance bandwidth of the proposed dual band antenna at lower resonant frequency is 12.7% (simulated) and 9.8 % (measured) whereas at upper resonant frequency is 15.3 % (simulated) and 13.97 % (measured).

2

Design of helical antenna for next generation wireless communication

100%

Zeain M. Y.

Przegląd Elektrotechniczny

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2020

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tom R. 96, nr 11

96--99

EN

This study proposes a novel helical antenna design for next generation applications. The strip helical antenna is prescribed for next generation wireless communication and wideband applications that offer circular polarization and a wide bandwidth. In fact, the proposed helical antenna suits 5.8 GHz frequency by using Teflon material. The newly-designed strip was printed on a substrate and rolled into a helix shape to achieve circular polarization without impedance matching. This antenna is meant for wideband wireless communication applications. A wide bandwidth of 2.7 GHz with 5.8 GHz resonant frequency was attained through the use of helical antenna on Teflon substrate. The proposed antenna on Teflon substrate recorded a gain of 8.97 dB and 92% efficiency. The antenna design parameters and the simulated results were retrieved using Computer Simulation Technology software (CST). The measurement result of return loss displayed mismatch at 5.22 GHz due to manual fabrication. This developed antenna may be applied for a number of wireless applications, including Wideband, Ultra-wideband, and 5G.

PL

Zaprezentowano projekt nowej anteny śrubowej o polaryzacji kołowej i szerokim paśmie. Antena umożliwia pracę przy częstotliwości 5.8 GHz. i pasmo 2.7 GHz, przy wzmocnieniu 8.97 dB I sprawności 92%. Symulację przeprowadzono przy pomocy oprogramowania CST.

3

Design and investigation on wideband antenna based on polydimethylsiloxane (PDMS) for medical imaging application

100%

Li N. Y. , Zakaria Z. , Shairi N. A. , Alsariera H. , Alahnomi R.

Przegląd Elektrotechniczny

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2020

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tom R. 96, nr 3

89--92

EN

This paper presents an antenna for the medical imaging application which can detect unusual tissues on any part of the body. A compact design of wideband antenna with wearable properties is proposed for the medical imaging application. The wideband antenna is designed with introducing notches to the patch and a t-shaped slot at the partial ground. Polydimethylsiloxane (PDMS) is introduced to the antenna for the implementation of the wearable antenna. The proposed antenna operated in a frequency range of 3GHz to 6GHz. The antenna that embedded with PDMS shows a good agreement to the antenna without PDMS. An experimental proposed structure shows a good agreement with the simulated results. The overall dimension of the antenna is 24mm(W) x 38mm( L) which consider is a miniature antenna. This proposed design give an alternative solution for the antenna which cannot be wear on the body and protect the antenna. The introduction of PDMS will reduce the signal reflection cause by the high coupling of the human body.

PL

W artykule opisano antenę umożliwiającą wykrywanie zmian w tkance w ciele człowieka. Antena została zaprojektowana do celw obrazowania medycznego. Antena pracuje w zakresie częstotliwości 3 – 6 GHz. Rozmiary anteny wynoszą 24 x 38 mm. Konstrukcja anteny umożlwia ciągła pracę w różnych warunkach i wykorzystuje polydimethylsiloxane PDMS.

4

Design of A Wideband Compact Electromagnetic Band Gap Structure for Lower Frequency Applications

100%

Alam M. S. , Islam M. T.

Przegląd Elektrotechniczny

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2013

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tom R. 89, nr 4

149-150

EN

A compact planar design of EBG structure with wide band gap is proposed in this study. The characteristic of the initial JC-EBG shape is analyzed by varying different dimensions and later improved results are obtained with a modified design. The maximum band gap achieved is 3.1 GHz (1.75-4.85 GHz), which is 31.91% more than initial one (2.35 GHz) and the lowest level of transmission coefficient obtained is around -100dB, with 12.5 mm unit cell size. The structure is designed on easily available standard PCB material and exhibits good performance in lower frequency range (below 6 GHz). Analyzed results showed the compatibility and tunability of the design for applications like GSM, PCS, WiMax, UMTS, WiFi, and Bluetooth etc.

PL

W artykule opisano projekt tłoczonej powierzchniowo struktury materiału EBG z szeroką przerwą energetyczną. Analizie poddano charakterystykę kształtu JC-EBG, poprzez wprowadzenie zmienności poszczególnych wymiarów. Proponowana struktura została opracowana na standardowym materiale PCB. Wykazuje dobre właściwości w zakresie częstotliwości poniżej 6GHz. Wyniki analizy pokazują możliwość szerokiego zastosowania opisanego rozwiązania.

5

Frequency Dependent Mismatch Correction Scheme for Zero-IF Receivers

84%

Hibner R. , Zieliński R. J.

International Journal of Electronics and Telecommunications

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2018

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tom Vol. 64, No. 1

13--18

EN

This paper shows effective method of linear distortions compensation in zero-IF receivers. With application of frequency domain processing a computation efficient method was developed that allows to correct quadrature mismatch in Zero-IF receiver along with gain and group delay independent of receiving signal type. Method was implemented and tested on hardware platform confirming its effectiveness. This method makes it possible to build high sensitivity devices to monitor spectrum in very wide frequency ranges.

6

Compact wideband metamaterial quadrature coupler for 5G beamforming applications

84%

Keriee H. H. , Rahim M. K. A. , Nayyef N. A. , Ayop O. , Al-Gburi A. J. A.

Przegląd Elektrotechniczny

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2023

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tom R. 99, nr 3

172--175

EN

A design of a compact wideband quadrature coupler based on metamaterial is presented at 3.5 GHz. The quadrature coupler is a significant component in beamforming networks with problems of narrow bandwidth and bulky size. The proposed quadrature coupler is designed with the implementation of composite right/left-handed (CRLH) arms metamaterial transmission line (TL). The metamaterial fingers are implemented in each branch section to reduce the size and improve the bandwidth. The proposed coupler is simulated using CST software and then fabricated on the FR4 substrate with (εr=4.4 and h=1.6 mm). The coupler performance achieved a fractional bandwidth of 55.42% operated at 2.25 GHz to 4.19 GHz. The coupling factor at 3.5 GHz is -3 ±0.5 dB with a phase difference of 88.01°. Compared to conventional BLC, the proposed coupler achieved a size reduction of 40.43%. The proposed coupler is suitable to be used in future 5G beamforming applications.

PL

Przedstawiono projekt kompaktowego szerokopasmowego sprzęgacza kwadraturowego opartego na metamateriałach dla częstotliwości 3,5 GHz. Sprzęgacz kwadraturowy jest istotnym elementem w sieciach kształtujących wiązkę z problemami związanymi z wąskim pasmem i nieporęcznymi rozmiarami. Proponowany sprzęgacz kwadraturowy został zaprojektowany z wykorzystaniem kompozytowej linii transmisyjnej metamateriałów (TL) ramion prawo/lewoskrętnych (CRLH). Palce metamateriałów są zaimplementowane w każdej sekcji odgałęzienia, aby zmniejszyć rozmiar i poprawić przepustowość. Proponowany łącznik jest symulowany za pomocą oprogramowania CST, a następnie wytwarzany na podłożu FR4 przy (εr=4,4 i h=1,6 mm). Wydajność sprzęgacza osiągnęła ułamkową przepustowość 55,42% przy pracy w zakresie od 2,25 GHz do 4,19 GHz. Współczynnik sprzężenia przy 3,5 GHz wynosi -3 ±0,5 dB przy różnicy faz 88,01°. W porównaniu z konwencjonalnym BLC, proponowany łącznik pozwolił zmniejszyć rozmiar o 40,43%. Proponowany sprzęgacz nadaje się do wykorzystania w przyszłych zastosowaniach kształtowania wiązki 5G.

7

Low-noise Wideband Circuit for Closed-loop RF CNT-NEMS Sensors

67%

Kauth C. , Pastre M. , Kayal M.

International Journal of Microelectronics and Computer Science

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2012

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tom Vol. 3, nr 2

67-72

EN

Hybrid NEMS interfaces are the key to systems combining the benefits of highly sensitive miniaturized mechanical sensors with the vast functionalities available in electronics. In this context, a phase-locked loop, locking on a suspended resonating carbon nanotube NEMS, is implemented and characterized, able to start, track, amplify and sustain NEMS oscillation up to 100MHz in a sensing environment. Detection of the signals out of the NEMS has been found most challenging and diverse RF front-ends meant for interfacing high-impedance carbon nanotube based NEMS are analyzed. Given the feeble signals from the NEMS, their high output impedance and non-negligible interconnect parasitics, front-end design must imperatively focus on minimal noise figure. Limits on minimal detectable signal are extracted via design, simulation and characterization of a 3-stage common-emitter front-end.