Journal
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
Volume 12, Issue 8, Pages 1253-1261Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCPMT.2022.3195880
Keywords
Surface treatment; Plasmas; Metamaterials; Antenna measurements; Optical device fabrication; Microwave measurement; Plastics; Indium tin oxide (ITO)-coated polyethylene terephthalate (PET) sheets; lap-shear strength; microwave metamaterial absorber (MMA); optically transparent adhesive; surface treatment
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Funding
- Science and Engineering Research Board, India [IMP/2018/000043]
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This article investigates the bonding method of heterogeneous layers of polymers and studies their microwave characteristics and optical transparency through simulations and experiments. Special composite materials are used as adhesive to meet the requirements of strong adhesion without affecting the microwave properties, and the feasibility of this method is demonstrated.
Bonding of the heterogeneous layers of polymers as a trilayered (or multilayered) transparent metamaterial absorber (MA) is challenging, since the hydrophobic nature of interfacial surfaces does not allow direct bonding. Apart from the mechanical challenges to bond, microwave and optical functionalities of the chosen material need to be studied quantitatively for an optimal choice. Therefore, simulations are performed to study the effect of dielectric constant and thickness of adhesive on the microwave characteristics of polyethylene terephthalate (PET)-polydimethylsiloxane (PDMS)-based microwave MA (MMA). Composites of polyvinyl butyral (PVB) and 3-aminopropyltriethoxy silane (APTES) that address the need for strongly adhesive yet transparent in optical regime and non-interacting in the microwave regime have been developed. Lap-shear tests with plasma-treated PET-PDMS adherends demonstrated to have lap-shear adhesion strengths greater than 0.21 MPa. The optical transmittance of electromagnetic (EM) waves through MA after being adhered with glue is 74.9%. A numerical analysis shows that the proposed microwave absorber absorbs more than 90% of EM waves within the range of 7.97-20.72 GHz after an additional layer of optimal adhesive, which is validated through experiments conducted in anechoic measurements.
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