Planar inverted-F antenna with extendable portion

Details Planar inverted-F antenna with extendable portion Planar inverted-F antenna with extendable portion

2006-07-11

2006-07-11

Nguyen, Hoang V. (Department: 2821)

Communications: radio wave antennas

Antennas

With radio cabinet

C343S876000

Reexamination Certificate

active

07075487

ABSTRACT:
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.

REFERENCES:
patent: 6252554 (2001-06-01), Isohatala et al.
patent: 6452558 (2002-09-01), Saitou et al.
patent: 6466173 (2002-10-01), Li
patent: 6529168 (2003-03-01), Mikkola et al.
patent: 6646606 (2003-11-01), Mikkola et al.
patent: 6727857 (2004-04-01), Mikkola et al.
patent: 2003/0048227 (2003-03-01), Nakamura

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