Multiband tunable antenna

Details Multiband tunable antenna Multiband tunable antenna

2007-01-25

2009-11-10

Phan, Tho G (Department: 2821)

Communications: radio wave antennas

Antennas

With variable reactance for tuning antenna

C343S722000, C343S749000

Reexamination Certificate

active

07616163

ABSTRACT:
One embodiment of the invention relates to an antenna providing a tunable resonant frequency within a low frequency band and further providing a high resonant frequency, the antenna comprises a first radiating structure of a first effective electrical length, a second radiating structure of a second effective electrical length having a fractional integer relationship to a wavelength related to the high resonant frequency and a variable reactance element connecting the first and the second radiating structures, wherein varying a reactance of the variable reactance element tunes the antenna within the low frequency band.

REFERENCES:
patent: 3909830 (1975-09-01), Campbell
patent: 4222053 (1980-09-01), Newcomb
patent: 4268834 (1981-05-01), Henry
patent: 4893131 (1990-01-01), Smith et al.
patent: 5754143 (1998-05-01), Warnagiris et al.
patent: 6140966 (2000-10-01), Pankinaho
patent: 6300913 (2001-10-01), Davidson
patent: 6624786 (2003-09-01), Boyle
patent: 6697030 (2004-02-01), Gleener
patent: 6836252 (2004-12-01), Tai et al.

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