公开(公告)号：US20060012529A1

公开(公告)日：2006-01-19

申请号：US10892858

申请日：2004-07-16

申请人： Jan-Ove Mattsson ,  Paloma Lampert ,  David Minasi

发明人： Jan-Ove Mattsson ,  Paloma Lampert ,  David Minasi

IPC分类号： H01Q1/24

CPC分类号： H01Q1/244 ,  H01Q9/0421 ,  H01Q21/28

摘要： An antenna structure (126) that includes a Planar Inverted-F Antenna (PIFA) (104) and an extendable portion such as a whip element (106). The PIFA (104) operates normally when the extendable portion (106) is retracted and upon extension, an electrical contact is made between the extendable portion (106) and the end (122) of the PIFA (104) that is electrically opposite, i.e., furthest along the electrically conductive path of the PIFA, from the feed structure (202, 208) for the PIFA (104). The electrical length of the composite antenna (126) is then substantially equal to the sum of the electrical length of the PIFA (104) and extendable portion (106). An embodiment disconnects the ground path of the PIFA feed structure upon extension of the extendable portion (106) to provide constant input impedance.