Printing of patterned copper on pliable, microtextured PDMS/ceramic composites Conference

Apaydin, E, Zhou, Y, Hansford, D et al. (2008). Printing of patterned copper on pliable, microtextured PDMS/ceramic composites . 1078 9-15. 10.1557/proc-1078-m13-01

cited authors

  • Apaydin, E; Zhou, Y; Hansford, D; Koulouridis, S; Volakis, J

authors

abstract

  • In this work, we present a novel printing technique that enables the usage of PDMS and ceramic powder mixed PDMS composites (we refer as "PDMS-ceramic composites" in this context), as a substrate for printing of copper conduction layers. This technique is based on microtransfer molding (iiTM) and lift-off for pattern formation [4]. Another key feature is the usage of microtextured PDMS and PDMS-ceramic composites before any copper film deposition. Our microtextured surface is composed of pyramid shaped wells (100 iim depth and 150 iim sides on PDMS surface). The poor adhesion between PDMS and copper is overcome by oxygen plasma application and titanium deposition before copper layer. In order to demonstrate the convenience of this technique in RF applications, copper conduction lines (5 mm wide, different lengths) were printed on microtextured PDMS substrates. These transmission lines successfully maintained a low resistance during large strain. The printed lines have the DC resistance of 0.5 2 and conductivity of 1 .3e6 S/m, and the transmission analysis of these lines show good results especially in the MHz range when compared to copper tape measurements. Apart from the conduction lines, the substrates can have ranging dielectric constants from 3 (no powder) to 23 (50% D270 powder, provided by TransTech) by volume mixing rule of ceramic powder and PDMS. Dielectric constant is important for RF applications, especially for antenna designs. Therefore, provided with a range of dielectric constants, these composite substrates are a great promise in RF field for pliable antenna fabrication [5]. For experiment purposes, some of the transmission lines are printed on these composite substrates as well as on pure PDMS. In this study, apart from the fabrication of transmission lines, this technique will be applied in a GPS antenna design for demonstration purposes. The antenna design is a single-fed circularly-polarized stacked antenna for tri-band GPS (Li, L2 and L5) applications [6]. For the fabrication of the antenna, polymer-ceramic materials oft1=16 and 2=30 will be utilized as the substrates [6].© 2008 Materials Research Society.

publication date

  • January 1, 2008

Digital Object Identifier (DOI)

International Standard Book Number (ISBN) 13

start page

  • 9

end page

  • 15

volume

  • 1078