Antenna system having a plurality of fundamental resonances

Details Antenna system having a plurality of fundamental resonances Antenna system having a plurality of fundamental resonances

1995-03-28

1998-08-25

Wimer, Michael C.

Communications: radio wave antennas

Antennas

Active sleeve surrounds feed line

343752, 343830, H01Q 940

Patent

active

057987360

ABSTRACT:
An antenna which is adapted to have multiple fundamental resonances includes an outer conductor electrically connected to a feed network and having a generally tubular portion opening through one end to define an internal cavity therein. The antenna also includes an interior conductor electrically connected at a first end to a portion of the outer conductor within the internal cavity. The interior conductor extends through the opening defined in the outer conductor to a second end to thereby define an extended conductor portion which extends beyond the outer conductor. The antenna also includes decoupling means for electrically decoupling the extended conductor portion of the interior conductor from the antenna for signals having frequencies within the upper frequency band. In one embodiment, the internal conductor portion has a predetermined electrical length equal to an odd multiple of a quarter wavelength of a signal having a frequency in the upper frequency band of the antenna. Thus, the extended conductor portion is effectively electrically decoupled from the antenna for signals having frequencies within the upper frequency band.

REFERENCES:
patent: 2112287 (1938-03-01), Hansell et al.
patent: 3735413 (1973-05-01), Woodward
patent: 4468675 (1984-08-01), Robinson
patent: 4509056 (1985-04-01), Ploussios
patent: 5311201 (1994-05-01), Lillie et al.

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