Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 63, Issue 8, Pages 2491-2497Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2015.2441062
Keywords
Graphene; microstrip lines; nanoelectronics; tunable microwave (MW) devices
Categories
Funding
- European Project Carbon Based Smart Systems for Wireless Applications (NANO-RF) [318352]
- European Union under EU FP7 Project [PIRSES-2012-318617 FAEMCAR]
- EU [FP7-PEOPLE-2013-IRSES-610875 NAmiceMC]
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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.
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