Transparent electromagnetic interference (EMI) shielding film has a wide range of applications in the optoelectronic and display systems in military, aerospace and other fields, which has attracted widespread attentions. In this paper, the electrohydrodynamic jet printing method was introduced into the additive preparation of transparent conductive films, and a batch of flexible transparent EMI shielding films with good EMI shielding effectiveness and low cost were achieved in a simple and easy way. We utilized electrohydrodynamic jet printing technique to directly print a grid-like micro structure on a flexible and transparent substrate, and a transparent EMI shielding film with a line width of 13.3 μm, period of 300 μm, and light transmittance of 73.2% was obtained. The EMI shielding effectiveness is about -18 dB in X band. In addition, the printing parameters was optimized to obtain transparent EMI shielding films that meet different performance requirements. The transparent EMI shielding film prepared by printing method requires no high-resolution mask and exposure in traditional microfabrication, and is quite low cost and convenient to adjust parameters digitally. This work proves that the additive electrohydrodynamic jet printing perfectly fits the transparent film research in stage of sample design and prototype.
Electrically tunable metamaterial is attracting extensive attention recently for its potential in electromagnetic compatibility (EMC) and radar scattering manipulation, while still remains a great deal of challenges in its tunability. In this paper, a conductivity tunable graphene-ion gel-graphene (GIG) sandwich structure is fabricated and measured to investigate the properties of ion gel, showing its advantages over ion liquid on flexibility and tunability. Besides, a frequency and amplitude dual-tunable metamaterial absorber based on the GIG sandwich structure is proposed, modeled and optimized. From the simulated response, the absorber can achieve the tuning of absorption frequency from 5.4 GHz to 7.1 GHz and the reflection minimum from -15 dB to -45 dB. With the introduction of tunability from varactor diodes and graphene, the working frequency and absorption can be almost independently tuned. This work gives a meaningful reference for graphene based tunable metamaterial based on solid ion gel, especially in conformal and outdoor environment applications.
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