Abstract
Laser-direct writing has become an alternative method to fabricate flexible electronics, whereas the resistive nature of laser-scribed conductors may distort the radio-frequency characteristics of circuits for high-frequency applications. We demonstrate that the transmission characteristics of microstrip lines are insensitive to the resistance of laser-scripted conductors when the sheet resistance is not above 0.32 Ω/□. On the other hand, the transmission and reflection characteristics of the MS lines can be simply modified through the accommodation of the resistance of the conductors, because a laser can trigger the sintering and melting of laser produced silver nanostructures. This could provide an alternative way to fabricate radio frequency (RF) resistors and promote their applications to flexible radio-frequency devices and systems.
Highlights
Laser-direct writing (LDW) appears to represent a good alternative to traditional methods for the fabrication of flexible electronic devices
We investigate the characteristics of laser-scribed microstrip (MS) transmission lines on we investigate the characteristics of laser-scribed microstrip (MS) transmission lines on flexible substrates
We demonstrate that the transmission characteristics of MS lines are insensitive to the resistance of the laser-scripted conductors when the characteristics of MS lines are insensitive to the resistance of the laser-scripted conductors when the sheet resistance is not above 0.32 Ω/□
Summary
Laser-direct writing (LDW) appears to represent a good alternative to traditional methods for the fabrication of flexible electronic devices. This technique offers noncontact and maskless patterning with a resolution that can go down to a submicrometer scale, a localized reaction that makes it less possible to damage the substrate, compatibility with a wide range of materials, and simplified fabrication procedures by combining several process into a single step [1,2,3,4] These merits meet the requirements for flexible electronic manufactures and lead to many applications, such as conductive electrodes [5,6], capacitors [7,8,9,10], and sensors [2,11,12]. The impedance mismatch generally results in a reflection of RF signals, which restrains the signals propagating into or outside RF functional structures [13]
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