Design of Thin, High Permittivity, Multiband, Monopole-Like Antennas

We address the design of multiband monopole-like antennas on thin, flexible, and high permittivity substrates. Antennas on such materials are of interest, e.g., in IoT applications and in printable electronics. As an example, we design an antenna for three LTE bands (0.8, 1.8, 2.6 GHz). The substrate used is $275 \mu \mathrm{m}$ thick, it has $\epsilon_{r}\approx 11$ and low dielectric loss and it supports screen printing. Our goals are (i) analyze step-by-step how various geometrical features affect the antenna performance and (ii) discuss building, modeling, and testing. We provide frequency domain, time domain, and characteristic mode analyses and measurement results.