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    Öğe
    Graphene-based microsrtip patch antenna for x-band application
    (Bursa Teknik Üniversitesi, 2019) Shehu, Aminu Atiku; Yunusa, Zainab
    Variety of materials with different dielectric constants are available for microstrip patch antenna. In the paper, graphene material is used and analyzed at X-band frequency. The use of graphene patch material as conducting substance for the antenna is assumed to improve the bandwidth and radiation efficiency on account of the outstanding functionalities and  electromagnetic properties. The antenna is designed with Duroid RT5880 (lossy) material with a dielectric constant of 2.2 palced between graphene patch and ground plane using Computer Simulation Tool (CST) Microwave Studio 2016. The resonance frequency of the antenna is 10.54 GHz with a gain of 7.86dB, return loss of -24.55 dB, directivity of 8.31 dBi and VSWR of 1.1.2. The antenna operates for frequencies from 8 – 12 GHz with an enormous bandwidth of 1.09GHz.
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    Octagonal Microstrip Patch antenna array with gain enhancement for WiMAX and WLAN Applications
    (Bursa Teknik Üniversitesi, 2019) Gabari, Abdullahi Auwal; Yunusa, Zainab; Hamidon, Mohd Nizar
    An octagonal microstrip patch antenna is presented in this paper. A small sized microstrip patch antenna with a high gain has been the focusing point of so many researches over the years. Microstrip patch antenna is basically known to have a low gain as a result various techniques are carried out in order to enhance the gain. In this work, a single patch octagonal microstrip patch antenna and a 1x2 octagonal patch antenna array are designed and the effects are studied. The structure is designed on four different substrates FR4, Duroid, Arlon and Rogers substrate materials. Copper is used as the patch and ground material. The antenna is designed on a small substrate material and it is probe fed. The simulated results of the array reveals a gain increase of 6.25dB from 3.6dB of the single patch on the FR4 substrate. The simulated results of the antenna in terms of reflection coefficients, voltage standing wave ratio (VSWR) and gains realized showed that the antenna has prospective applications for 4.6 and 5.9GHz applications. Conclusively, the antenna with the FR4 substrate shows the best antenna performance in terms of Gain and Return loss and its operating frequency falls under the WiMAX and WLAN range compared to the other substrates. The tool used for the design and simulation is the Computer Simulation Technology (CST) microwave studio.