“…Previously, several flexible substrates have been implemented, including paper [7][8][9][10][11], polyethylene terephthalate (PET) [12][13][14], polyimide (PI) [15][16][17], liquid crystal polymer (LCP) [18], FLGR02 [19], polydimethylsiloxane (PDMS) [20], polytetrafluoroethylene (PTFE) [21], and leather [22]. e antenna configuration includes monopole [8][9][10][11][12][13][14][15], patch [14,18,20,21], dipole [15], inverted-F [16], quasi-Yagi [19], and slot [22]. Most of the antenna is a single element [7-13, 15-17, 19-22]; however, relatively few studies propose inkjet-printed flexible antenna arrays [14,18,[33][34][35]; and these antenna arrays have not been tested over folding angles.…”