Efficient graphene-based circularly polarized MIMO antenna for THz applications
ChunchulaSai Vamsi, Ajay Kumar Dwivedi, Gagandeep Bharti, Vandna Rani Verma, Anand Sharma
Abstract
In this paper, a graphene-based (MIMO) antenna is designed and examined. Two unique properties of the proposed terahertz (THz) MIMO antenna are (1) circular polarization is achieved through an asymmetrical cross slot, etched over the graphene patch; and (2) a bidirectional radiation pattern is achieved through oppositely oriented identical antenna ports. Mutual coupling between the antenna ports is less than <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mo>−</mml:mo> </mml:mrow> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mn>35</mml:mn> </mml:mrow> <mml:mspace width="thickmathspace"/> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mi mathvariant="normal">d</mml:mi> <mml:mi mathvariant="normal">B</mml:mi> </mml:mrow> </mml:math> . Due to the inclusion of the pattern diversity concept, a low value of envelope correlation coefficient is achieved. The proposed THz radiator operates over the frequency range of 4.67–4.87 THz, along with a 3 dB axial ratio between 4.76 and 4.81 THz. This type of antenna is widely employable for biomedical applications.