Printed low loss capacitors for use in a wireless humidity sensor label
(English)Manuscript (preprint) (Other academic)
A low loss printed capacitor is achieved by using a screen printable benzocyclobutene-based solution. The dissipation factor is measured to be 0.001 at frequencies around 3 MHz, which is low compared to commercially available dielectric inks with dissipation factors of ~0.05 in the same frequency region. By incorporating low loss printed capacitors with a planar antenna and a printed humidity sensor capacitor, a humidity sensor label which resonates at 3 MHz is demonstrated. The label is fully printed on a flexible substrate pre-patterned with the antenna and the manufacturing process is compatible with low-cost reelto-reel processing technology. The quality factor (Q factor) of the sensor label is enhanced up to about 15 in ambient environment. This allows readout of the sensor response at a distance and through damping materials such as walls in a building.
Printed humidity sensor label;
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-97350OAI: oai:DiVA.org:liu-97350DiVA: diva2:647093