Graphene‐metal based tunable band‐pass filters in the terahertz band. Issue 14 (1st November 2016)

• Record Type: Journal Article
• Authors: Yao, Yuan; Cheng, Xiaohe; Qu, Shi‐Wei; Yu, Junsheng; Chen, Xiaodong
• Is Part Of: IET microwaves, antennas & propagation. Volume 10:Issue 14(2016)
• Page Start: 1570
• Page End: 1575
• Publication Date: 2016-11-01
• Subjects: resonator filters -- submillimetre wave filters -- microwave filters -- dielectric materials -- electric properties -- Q‐factor -- band‐pass filters -- graphene; C -- filter circuit dimensions -- coupling coefficient -- external quality factor -- resonance frequency -- electrical properties -- microwave filter theory -- DC bias -- insertion loss -- metal‐contacted graphene hairpin resonators -- frequency tunable band‐pass filters -- terahertz band; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2016.0335
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : The authors propose the concept, analysis, and design of frequency tunable band‐pass filters operating in the terahertz band. The proposed structure is composed of two metal tapped line and five metal‐contacted graphene hairpin resonators transferred onto a dielectric. This structure implements low insertion loss and frequency tunability by adequately controlling DC bias applied on the graphene. An efficient synthesis method has been presented, through combining classical microwave filter theory and the electrical properties of graphene. The theoretical and extracted resonance frequency of resonator ( f 0 ), external quality factor ( Q E ) and coupling coefficient ( Kij ) are utilised to determine the filter circuit dimensions. Then the authors proposed two examples with different operating bandwidths to validate the theoretical design. The potentially high losses of graphene is also evaluated.