Broadband Microwave Attenuator Based on Few Layer Graphene Flakes

This paper presents the design and fabrication of a broadband microstrip attenuator, operating at 1-20 GHz, based on few layer graphene flakes. The RF performance of the attenuator has been analyzed in depth. In particular, the use of graphene as a variable resistor is discussed and experimentally c...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2015-08, Vol.63 (8), p.2491-2497
Main Authors: Pierantoni, Luca, Mencarelli, Davide, Bozzi, Maurizio, Moro, Riccardo, Moscato, Stefano, Perregrini, Luca, Micciulla, Federico, Cataldo, Antonino, Bellucci, Stefano
Format: Article
Language:English
Subjects:
Attenuators
Design engineering
Electrical resistance measurement
Graphene
Insertion loss
Loss measurement
Microstrip
microstrip lines
nanoelectronics
tunable microwave (MW) devices
Voltage measurement
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Summary:This paper presents the design and fabrication of a broadband microstrip attenuator, operating at 1-20 GHz, based on few layer graphene flakes. The RF performance of the attenuator has been analyzed in depth. In particular, the use of graphene as a variable resistor is discussed and experimentally characterized at microwave frequencies. The structure of the graphene-based attenuator integrates a micrometric layer of graphene flakes deposited on an air gap in a microstrip line. As highlighted in the experiments, the graphene film can range from being a discrete conductor to a highly resistive material, depending on the externally applied voltage. As experimental evidence, it is verified that the application of a proper voltage through two bias tees changes the surface resistivity of graphene, and induces a significant change of insertion loss of the microstrip attenuator.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2015.2441062