Abstract
We present a low-power, cost-effective, highly reproducible, and disposable bandstop filter by employing high-throughput screen-printing technology. We apply large-scale printing strategies using silver-nanoparticle-based ink for the metallization of conductive wires to fabricate a bandstop filter on a polyethylene terephthalate (PET) substrate. The filter exhibits an attenuation pole at 4.35 GHz with excellent in-and-out band characteristics. These characteristics reflect a rejection depth that is better than −25 dB with a return loss of −0.75 dB at the normal orientation of the PET substrate. In addition, the filter characteristics are observed at various bending angles (0°, 10°, and 20°) of the PET substrate with an excellent relative standard deviation of less than 0.5%. These results confirm the accuracy, reproducibility, and independence of the resonance frequency. This screen-printing technology for well-defined nanostructures is more favorable than other complex photolithographic processes because it overcomes signal losses due to uneven surface distributions and thereby reveals a homogeneous distribution. Moreover, the proposed methodology enables incremental steps in the process of producing highly flexible and cost-effective printed-electronic radio devices.
Highlights
Flexible cost-effective devices, such as radiofrequency identification (RFID), antennas, and filters, are needed for enabling realization of high-performance devices for operation in frequency bands of the monolithic microwave integrated circuit (MMIC) and radiofrequency integrated circuit (RFIC)
High-performance, low-cost, and flexible narrowband bandstop (NBBS) filters with a minimum size and weight, high-frequency selectivity, and excellent pass-band insertion and return losses are important for C-band applications in modern communication systems
A flexible NBBS filter was designed and fabricated on the polyethylene terephthalate (PET) substrate with Ag nanoparticles as the conductive material for the transmission-line oriented at the normal condition (0∘) to the surface, with the maximum signal attenuation level of −25.88 dB and an attenuation pole at 4.35 GHz, as shown in Figures 7(a) and 7(b)
Summary
Flexible cost-effective devices, such as radiofrequency identification (RFID), antennas, and filters, are needed for enabling realization of high-performance devices for operation in frequency bands of the monolithic microwave integrated circuit (MMIC) and radiofrequency integrated circuit (RFIC). High-performance, low-cost, and flexible narrowband bandstop (NBBS) filters with a minimum size and weight, high-frequency selectivity, and excellent pass-band insertion and return losses are important for C-band applications in modern communication systems These parameters are the key factors for the development of demanding, miniature, and multifunctional communication systems for wireless sensor networks and smart electronic devices. Screen-printing is a promising approach for large-scale fabrication with minimal radial loss by the skin effect at high frequency with even surface characterization electroplated by Ag nanoparticles This approach has surpassed the aforementioned complex photolithography process. To address the above limitations, we propose a simple and cost-effective method to manufacture a highly reproducible BSF on a PET substrate by employing high-throughput screen-printing technology with an attenuation pole at 4.35 GHz. Excellent performance of transmission parameters in the stop band with a good morphological characterization of the Ag nanoparticles justifies the operational characteristics of BSF. The result of an RSD value of less than 0.5% confirms the accuracy, reproducibility, and independence of the resonance frequency despite the flexibility of the substrate
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