Bi-function Compact graphene
lens antenna in terahertz (THz) band has been investigated. The array function
is switched between two status, reflectarray and/or transmitarray. The
tunability of graphene conductivity introduces the bi-function characteristics
of a single array structure in the THz band. The design depends on changing the
graphene DC biasing voltage to transform the transmitting antenna to reflecting
antenna. The compact structure of the antenna array saves the cost and the
allocation area for the terahertz communication applications. A 13 × 13
reflectarray/ transmitarray antenna covering an area of 364 × 364 μm2 is proposed. A dual-beams reflectarray/transmitarray antenna is achieved by rearranging the cell elements of the array successively.
Finally, a single structure is used to work as reflectarray and transmitarray
antenna at the same time by rearranging the applied voltages between the
different pieces of the graphene sheet using chess board arrangement. The
phases of the successive unit-cells are kept the same of their locations in the
original full array. The radiation characteristics of the array are
investigated using the CST Microwave Studio for the bi-function operation.
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