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

Alam M. S., Islam M.T.

Przegląd Elektrotechniczny

2013

R. 89, nr 4

149-150

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.

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.

Dufour and soret effects on steady free convection and mass transfer flow past a semi-infinite vertical porous plate in a porous medium

Alam M. S., Ferdows M., Ota M., Maleque M. A.

International Journal of Applied Mechanics and Engineering

2006

Vol. 11, no 3

535-545

Steady two-dimensional free convection and mass transfer flow past a continuously moving semi-infinite vertical porous plate in a porous medium is studied theoretically, by taking into account the Dufour and Soret effects. The similarity equations of the problem considered are obtained by using usual similarity technique. The resulting equations are then solved numerically by shooting method using Runge-Kutta sixth-order integration scheme. The non-dimensional velocity, temperature and concentration profiles are displayed graphically for different values of the parameters entering into the problem. In addition, the skin-friction coefficient, the Nusselt number and Sherwood number are shown in tabular form.