研究目的
Investigating the development of a fully inkjet-printed electronically tunable active flexible frequency selective surface (FSS) with integrated on-package solar cells for smart packaging applications.
研究成果
The paper presents a novel methodology to realize fully inkjet-printed electronically tunable frequency selective surfaces with an on-package solar cell and varactors. The proposed design addresses major issues with traditional electronically tunable FSS structures, offering a fast on-the-?y tunable RF-shielding in a moving platform or unpredictable EM radiation environment without a dedicated bulky power supply or inefficient bias network.
研究不足
The voltage produced by the inkjet-printed solar cells is not large enough to significantly vary the frequency response of the proposed FSS structure. This can be resolved by using larger solar cells, combining multiple solar cells in series, or more sensitive varactors.
1：Experimental Design and Method Selection
The paper introduces a novel methodology to realize fully inkjet-printed electronically tunable frequency selective surfaces with an on-package solar cell and varactors. The design and modeling of FSSs with integrated solar cells are discussed, followed by a detailed fabrication process of inkjet-printed solar cells and FSSs.
2：Sample Selection and Data Sources
The samples used in the experiment include inkjet-printed solar cells and FSS structures fabricated on Kapton substrates.
3：List of Experimental Equipment and Materials
The equipment includes a Fujifilm Dimatix 2800 series inkjet printer using Dimatix 16 nozzle 10pL printheads. Materials include commercial silver nanoparticle (SNP) and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) inks, Poly(3-hexylthiophene-2,5-diyl) (P3HT), Phenyl-C61-butyric acid methyl ester (PCBM), and Polyethylenimine (PEI).
4：Experimental Procedures and Operational Workflow
The fabrication steps involve printing the bottom electrode of the solar cell using SNP ink, printing PEI on the SNP, printing the active material layers, and finally printing PEDOT:PSS as the top electrode. The FSS structure is then integrated with the solar cells and varactors.
5：Data Analysis Methods
The simulation results were verified using a bistatic measurement setup consisting of two broadband horn antennas connected to an Anristu MS46522B-040 vector network analyzer (VNA).
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