Transparent electromagnetic shielding enclosure with CVD graphene

Abstract

Cavity resonant modes of shielding enclosure for housing electronic circuits may cause electromagnetic interference (EMI). Here, we present an effective approach by using graphene to suppress unwanted resonant modes while maintaining good transparency to visible light. The structure consists of graphene sheet on quartz substrate attached to the shielding enclosure made from indium tin oxide. We experimentally demonstrate that the proposed approach can lead to good absorption of microwave waves at a wide frequency range from 5 to 12 GHz and high attenuation of cavity modes up to 20–30 dB. Its effectiveness of EMI shielding averaged 20 dB is proven to be comparable with conventional metallic enclosures.

A Study on the Fused Deposition Modeling Process of Graphene/Nano-Fe3O4 Composite Absorber and its Absorbing Properties of Electromagnetic Microwave

“…According to the measured electromagnetic parameters, the transmission line theory was used to calculate and analyze their reflection loss. The formulas are as follows [8]:…”

A review of microwave devices based on CVD-grown graphene with experimental demonstration

“…Apart from the application for attenuators, absorbers and antennas, the CVD-grown graphene can also be used in EMI shielding or the beam configuration field. In 2016, Wu et al proposed a transparent electromagnetic shielding enclosure based on CVD-grown graphene [31]. It can be observed from Figure 10 that the monolayer graphene with the surface impedance of 500 V/□ on the quartz substrate is attached to an enclosure made of indium tin oxide (ITO).…”

Ultrathin Active Layer for Transparent Electromagnetic Shielding Window

“…24 Zhao et al designed an optically transparent shielding enclosure by integrating indium tin oxide with graphene/quartz substrates, which effectively suppresses the cavity-resonant modes, and the shielding enclosure may cause EMI. 25 Wen et al reported high-efficiency EMI shielding of light-weight RGOs at elevated temperatures. 26 Cao et al found that ultrathin and lightweight graphene composites exhibit high-efficiency microwave absorption at elevated temperatures.…”

“…Lu et al investigated the EM interference (EMI) shielding performance of multilayer graphene (without doping)/polyethylene terephthalate (PET) structure at 18–26.5 GHz . Zhao et al designed an optically transparent shielding enclosure by integrating indium tin oxide with graphene/quartz substrates, which effectively suppresses the cavity-resonant modes, and the shielding enclosure may cause EMI . Wen et al reported high-efficiency EMI shielding of light-weight RGOs at elevated temperatures .…”