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1
Analysis of the problems faced by the fresh IPE graduates at their initial career
100%
Rahman M. A. , Islam M. T.
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2018
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tom 110
2
Content available remote Design and Analysis of A Multi Band Electrically Small Antenna Using Ceramic Material Substrate
80%
Ullah M. H. , Islam M. T. , Mandeep J. S. , Misran N.
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tom R. 89, nr 1a
271--274
EN
A Multi band modified S shaped electrically small microstrip patch antenna on Aluminium tri-oxide ceramic substrate is designed and analyzed in this paper. The proposed microstrip line fed miniature patch antenna designed by using high frequency electromagnetic solver and the computed results are analyzed by using finite element method. It is observed from obtained results that, the achieved -10 dB return loss bandwidth 410 MHz in Ku band and 350 MHz in K band, 1.5dBi average gain in total operating band, 97.3% of average efficiency are achieved for Ku and K applications. Furthermore, the co-cross polarization of radiation pattern and the current distribution along surface the radiating patch of the proposed antenna are analyzed.
PL
W artykule przedstawiono projekt wielopasmowej prostokątnej anteny mikropaskowej o elektrycznie małych rozmiarach na podłożu ceramicznym z trójtlenku aluminium. W pracy wykorzystano pakiet programowy do obliczania pól elektromagnetycznych wysokich częstotliwości, a otrzymane wyniki poddano analizie metodą elementów skończonych.
3
Content available remote A New Approach to the Design of Low-Complexity Direct Digital Frequency Synthesizer
80%
Omran Q. K. , Islam M. T. , Misran N.
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tom R. 89, nr 5
157-160
EN
A low–complexity direct digital frequency synthesizer based on linear interpolation method is presented in this paper. The proposed architecture employs a new technique to derive the slope coefficients at the first sample of each segment's interval thereby eliminating the ROM which stores those values. ROM elimination has resulted in significant logic element saving and simplified the whole DDFS structure. The proposed DDFS has been analyzed using MATLAB and tested over entire Nyquist frequency range. The spurious free dynamic range (SFDR) of synthesized sinusoid achieved is 84 dBc. The resultant low complexity architecture along with high spectral purity synthesized signal meets the specifications of recent portable battery-driven products.
PL
W artykule przedstawiono bezpośredni syntezator cyfrowy częstotliwości, opracowany w oparciu o metodę interpolacji liniowej. Zastosowana technika pozwala na uzyskanie współczynnika pochyłości już z pierwszą próbką każdego z interwałów segmentów, przez co eliminowana jest konieczność użycia pamięci ROM. Przeprowadzono symulacje proponowanego rozwiązania w pełnym zakresie częstotliwości Niquist’a. Działanie metody zostało porównane z innymi znanymi architekturami.
4
Content available remote Dual Frequency Triangular Slotted Microstrip Patch Antenna for Ku Band Applications
80%
Samsuzzaman M. , Islam M. T. , Yatim B. , Ali M. A.
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tom R. 89, nr 1a
275--279
EN
A single feed, compact, new shaped, dual band microstrip patch antenna has presented in this paper. Here three equilateral triangular slots are introduced in the three edges of the patch and a small feed line has used another edge of the patch to obtain the dual band. The antenna has a condensed structure where patch dimension is about 8.5mm by 7.96mm by 1.905mm leading to good bandwidths covering 13.15 GHz to 13.72 GHz and 16.04 GHz to 16.58GHz. The return loss of -19.00dB is achieved at the first resonant frequency at 13.61 GHz and -28.69dB is at second resonance frequency at 16.33GHz. Stable average peak gain that is observed across the operating band in both lower and higher frequency is almost 3.53dB and 5.562dB respectively .The radiation patterns are nearly omnidirectional with moderate gain in both these operating bands. Good results have been established in dual frequencies at 13.62GHz as downlink and 16.33GHz as uplink. This low profile nature and simple configuration of the proposed antenna show the way to easy fabrication and make it adaptable for the application in wireless and satellite communication.
PL
W artykule przedstawiono dwupasmową prostokątną antenę mikropaskową o jednym doprowadzeniu i nowym kształcie. W trzech rogach znajdują się trzy szczeliny w kształcie trójkąta równobocznego, a w czwartym doprowadzenie linii. Antena posiada pasmo 13,15-13,72GHz oraz 16,04-16,58GHz. Niski profil oraz prosta konfiguracja wskazują na łatwą metodę produkcji oraz możliwość zastosowania w aplikacjach bezprzewodowych i komunikacji satelitarnej.
5
Content available A 3D directive microwave antenna for biomedical imaging application
80%
Ullah M. A. , Alam T. , Islam M. T.
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nr 3
6
Content available Dual-band multi slot patch antenna for wireless applications
80%
Samsuzzaman M. , Islam M. T. , Faruque M. R. I.
Journal of Telecommunications and Information Technology
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2013
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tom nr 2
19--23
EN
In this paper a novel configuration of broadband multi slot antenna for C/X bands is presented and analyzed. By cutting two diamond slots in the middle of the rectangular patch and three triangular slots in the right side of the patch, resonances can be created. Microstrip feed line is used in the down side region of the patch. Antenna characteristics were simulated using a finite element method (HFSS). According to simulations, the proposed multiple slot antennas can provide two separated impedance bandwidths of 970 MHz (about 11.96% centred at 8.11 GHz band) and 890 MHz (about 9.76% centred at 9.42 GHz band) and stable radiation patterns, promising for satellite systems.
7
Content available Miniature size multiband planar patch antenna fabricated on a bioplastic substrate
71%
Ahsan M. R. , Islam M. T. , Ullah M. H. , Arshad H. , Ali M. T.
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tom Vol. 63, nr 4
971--976
EN
In this article, a simple design of rectangular microstrip feed planar antenna with wide arcs and square shape slot is proposed for Radio Frequency Identification (RFID),Worldwide Interoperability for Microwave Access (WiMAX) and C/X-band wireless communications. The prototype of the antenna has been fabricated 1.0 mm thick ceramic filled bioplastic substrate by using optimal dimension obtained from design/simulations and antenna performances are experimentally tested. The experimental results confirm the impedance bandwidths for S11 ≤ −10 dB are of 712 MHz (0.355-1.067 GHz), 1.38 GHz (2.92-4.3 GHz) and 2.46 GHz (6.55-9.01 GHz) for 0.788, 3.34 and 8.01 GHz band respectively. The proposed antenna shows almost steady and symmetrical radiation patterns for all three bands with the maximum gains of 1.37, 2.8 and 3.56 dBi respectively. Based on the antenna performances, it can successfully cover the frequency band requirement for RFID, WiMAX and C/X-band applications.
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