Journal
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Volume 15, Issue -, Pages 1549-1552Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2016.2521835
Keywords
Antennas; graphene; nonreciprocity; terahertz; theoretical limit
Funding
- European Commission [CNECT-ICT-604391]
- Hasler Foundation [11149]
- Swiss National Science Foundation (SNSF) [133583]
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Theoretical upper limits on the radiation efficiency of reconfigurable antennas based on graphene are presented in closed form and discussed. The theory provides useful information for the design of these structures independently of the type and geometry of the antenna. The case of beam steering, which is very relevant for recently proposed graphene terahertz reflectarrays, is analyzed in detail. Finally, the theory is extended to the nonreciprocal case demonstrating that magnetostatically biased graphene allows the creation of nonreciprocal antennas, but that also in this case there are precise theoretical limits on the antenna efficiency.
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