Browsing by Author "Dehmas, Mokrane (Supervisor)"

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    Study and realization of a multiband microstrip antenna
    (2016) Rami, Youcef; Haffadh, Hichem; Dehmas, Mokrane (Supervisor)
    A microstrip patch antenna having the shape of the letter Z written in the Berber language Tifinagh transcription has been simulated in previous works and it has been noticed that it exhibits interesting multiband features. However, all carried analyses were confined in the theoretical and simulation aspects and were not validated experimentally. In this work, this antenna shape is reconsidered in the frequency range extending up to 6 GHz and simulated taking into account practical considerations related to used materials and experimental aspects. The antenna dimensions and configuration have been modified accordingly to meet desired resonant frequencies. After that, the developed structure was fabricated and its return loss measured. Though the oldness of the used substrate board, a good agreement is obtained between simulation and experimental results; the simulated resonant frequencies are located at 0.96 GHz, 2.45 GHz and 4.11 GHz whereas the measured ones were at 0.97GHz, 2.56 GHz and 4.22 GHz. Also, a similar and adequate impedance matching is observed in both simulated and experimental results. The developed antenna can be used in various applications such as GSM and Wi-Fi/WLAN.
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    Ultra large band printed monopole antenna
    (2016) Settou, Noureddine; Zouari, Ferhat; Dehmas, Mokrane (Supervisor)
    In this work, an Ultra Large Band modified circular shape printed monopole antenna operating in the frequency range extending from 2.60 GHz to 12.15 GHz has been developed. This is achieved by first introducing to the considered original circular shaped antenna defects that resulted in a simulated ULB behavior. The obtained monopole structure has been fabricated and its reflection coefficient measured. A good agreement is observed with the simulated results. The measured antenna percent bandwidth is 129 % whereas the simulated one is 149%. In addition, the antenna simulated and measured refection coefficients present a quite similar form over the frequency range where a good impedance matching is observed. The antenna can operate in different frequency bands (S, C and X) and hence, it is suitable for the various applications covered by these bands. Moreover, different radio electric properties including input impedance, current distribution as well as 2D and 3D radiation patterns are simulated using the CST Microwave Studio tool.