“…Depending on the type of application, it is vital to choose a suitable flexible material as a substrate. In last few decades, various types of flexible materials have been adopted as substrates for antennas to provide flexibility including textile or fabrics [ 44 , 155 , 156 , 157 , 158 , 159 ], paper [ 160 , 161 , 162 , 163 , 164 , 165 ] and polymers [ 3 , 7 , 8 , 10 , 14 , 15 , 26 , 28 , 29 , 39 , 55 , 57 , 58 , 59 , 61 , 62 , 63 , 73 , 77 , 78 , 79 , 80 , 81 , 85 , 86 , 104 , 139 , 148 , 149 , 166 , 167 , 168 , 169 , 170 , 171 , 172 , 173 , 174 , 175 , 176 , 177 ...…”