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The Performance of Thick-Film CPW Lines Made from Nano-Particle Silver Over the Frequency Range 110GHz-220GHz
Keywords: nano-particles silver, thick film technology, coplanar waveguide CPW
Coplanar waveguide lines fabricated using thick-films of pure silver paste (Ag) and silver nano-particles (nAg) were measured in the high frequency range 110GHz-220GHz. Suitable feed lines and pads were designed and fabricated using photoimageable silver ink, to allow measurement to be performed using a wafer-probing station with 75m pitch CPW probes. Silver nano-particle materials have a particular benefit in the higher frequency ranges due to the higher bulk conductivity, resulting in lower bulk loss. Different lengths of CPW lines were fabricated, to allow subtraction of the mismatches between the feeding pads and the coplanar lines under test. The CPW lines were fabricated on various alumina substrates, with purities of 96% and 99.5 %. A comparison was made between the loss in lines made from nano-silver and lines made from gold, both on 96% and 99.5% alumina. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) measurements were performed on the lines surfaces to establish the surface roughness. A comparison was then made of the physical differences between the surface topography of pure silver and nano-particle silver. This data provided useful information on the surface resistance and consequent surface losses. These losses are particularly significant over the G-band frequency range. The pastes were prepared at Warsaw University of Technology (Poland), and tested at the University of Surrey (UK).
Ali Alshehri, Student
University of Surrey, Advanced Technology Institute
Guildford, Surrey GU2 7YW,
UK


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