3D Multilayer Integration and Packaging on Organic/Paper Low-cost Substrates for RF and Wireless Applications

Fully Printed Chipless RFID Tags Using Dipole Array Structures with Enhanced Reading Ranges

“…However, the electrical characteristics of paper should be considered before designing RFID tags on it. Previous studies [14][15][16] have already shown that paper has appropriate electrical properties as a substrate for UHF and SHF frequency bands. …”

Inkjet-printed silver film on multilayer liquid crystal polymer for fabricating a miniature stub-loaded bandpass filter

“…Previous research [5] reported the development of an inkjet-printed folded-bowtie radio frequency identification tag module on a paper substrate. In [6], an inkjet-printed three-stage slotted-patch bandpass filter on multilayer paper substrates was presented for wireless local area network applications. Although paper was shown to be an effective substrate that offers low cost, as well as fast and simple inkjet printing; however, its application remains limited because of issues related to high frequency, absorptivity, and humidity issues.…”

“…Studies [10,11] have demonstrated that employing inkjet printing technology for fabricating LCP substrates. Moreover, inkjet-printed technology is faster and more economical than using additive manufacturing technologies [5,6,12,13]. The technologies can be used to give flexible properties to a flat, curved, or dynamic surface.…”

High conductivity printing on polymer-ceramic composites

“…In spite of their attractive electrical properties, printing on polymers is a major issue, and has been the topic of recent papers [8,9]. For RF applications, a challenge is that of retaining high conductivity of the printed metallic pattern when the polymer surface is bent or deformed.…”

“…In contrast, polymerceramic composites [2] offer much greater range of dielectric values from ε r =3 to ε r =20 or higher. Of importance about the polymer-ceramic composites are that a) polymers can be doped to make them functional and control their dielectric properties; b) they are "soft" and pliable (unlike crystalline materials); c) thin polymer layers can be printed and then stacked to form packaged 3D electronics and d) they can be reinforced with carbon-based nanotubes to render them structurally capable for UAV embedded antennas and smart skins.In spite of their attractive electrical properties, printing on polymers is a major issue, and has been the topic of recent papers [8,9]. For RF applications, a challenge is that of retaining high conductivity of the printed metallic pattern when the polymer surface is bent or deformed.…”