Linearly-polarized patch PIFA for GPS/GLONASS operation inside a metal back cover tablet

A linearly-polarized (LP), planar inverted-F antenna (PIFA) embedded inside a tablet computer with a complete, metal back cover for global positioning system (GPS) and global navigation satellite system (GLONASS) operations is proposed. The antenna was constructed by stamping a flat plate with dimensions 6 mm × 9 mm × 50 mm. The patch PIFA was fed and short-circuited at the top patch above the antenna ground with a vertical ground wall, connecting therebetween and facing the interior of the tablet. Effects of various antenna locations on the right-hand circularly-polarized (RHCP) and the left-hand circularly-polarized (LHCP) patterns were also analyzed.