In a planar inverted F antenna (PIFA), the feed and RF grounding connections are reversed yielding improved performance. Relative positioning of these connections is selected to tailor the characteristics of the antenna, such as resonant frequency and impedance bandwidth. ...http://www.google.de/patents/US20030025637?utm_source=gb-gplus-sharePatent US20030025637 - Miniaturized reverse-fed planar inverted F antenna
