Abstract
This article presents a 2×1 CPW ultra wideband rectangular slot antenna array (UWB-RSAA) with a modified circular slot shape to support a high data rate for wireless communications applications. The proposed antenna array dimensions are 0.7λ×0.8λo×0.064λo at the resonant frequency 1.8 GHz. It is fabricated on Rogers RO4003 substrate and fed by using a coplanar waveguide (CPW). A graphene layer is added on one side of the substrate to realize frequency reconfigurability and improve the array gain. The proposed array acquires -10 dB impedance bandwidth of the RSAA that extends from 1.7 GHz to 2.6 GHz, from 3.2 to 3.8 GHz, and from 5.2 GHz to 7 GHz. The proposed array achieved a realized peak gain of 7.5 dBi at 6.5 GHz at 0 Volt bias with an average gain of 4.5 dBi over the operating band. When the graphene bias is increased to 20 Volt, the antenna bandwidth extends from 1 GHz to 4 GHz and from 5 to 7 GHz with a peak gain of 14 dBi at 3.5 GHz and an average gain of 7.5 dBi. The linearly polarized operation of the proposed array over the operating bands makes it suitable for short-range wireless communications .
Highlights
Frequency tuning of the microwave systems has gained a great attention in the research field of antennas for wireless communications
Many researches have been presented on graphene applications for radio frequency (RF), microwave (MW), millimetre wave (MM) and tera hertz (THz) applications [13,14,15]
A coplanar waveguide (CPW) rectangular slot 2×1 antenna array is presented in this paper with frequency range extend from 1.7 to 2.5 GHz, 3.3 to 3.5 GHz and from 5.5 to 5.8 GHz with average gain about 7.5 dBi over the operating bands
Summary
Frequency tuning of the microwave systems has gained a great attention in the research field of antennas for wireless communications. A great effort has been done in this area for designed array antenna with frequency reconfigurablity [18,19,20,21] and the proposed 2×1 recongurable antenna array is shown in Fig.. Reconfigurable 2×1 CPW-fed RSAA with an acceptable gain is introduced. |S11| versus frequency for the design steps of the proposed antenna array. This section described the adding of two dimensions of graphene layer on the other side of the Roger substrate as a sandwich between the Roger substrate and silicon oxide substrate to reconfigurable the operating frequency
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