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In this paper, inkjet-printed microwave circuits fabricated on paper-based substrates were investigated, as a system-level solution for ultra-low-cost mass production. The RF characteristics of the paper-based substrate were studied by using the cavity resonator method and the Transmission Line method in order to characterize the dielectric constant (ε r ) and loss tangent (tanδ) of the substrate. A UHF RFID tag module was then developed with the inkjet-printing technology which could function as a technology for much simpler and faster fabrication on/in paper. Simulation and well-agreed measurement results verify a good performance of the tag module. In addition, for the first time, the possibility of paper-based substrate for multilayer microwave structures was explored, and a 2.4 GHz multilayer patch resonator bandpass filter with insertion loss < 0.6dB was demonstrated. These results show that the paper material can serve for the purpose of economical multilayer structures for telecommunication and sensing applications.
Yang et al. (Fri,) studied this question.